1. A transducer characteristic detecting device characterized by: the testing device comprises a testing box, a temperature control box and a detection assembly, wherein the testing box is arranged in the temperature control box, and a fixing hole for fixing an energy transducer is formed in the side wall of the testing box; the detection assembly comprises a controller, an excitation receiving circuit, an impedance analyzer, a selector switch and a data acquisition unit; the controller is respectively electrically connected with the excitation receiving circuit, the impedance analyzer and the switch, the excitation receiving circuit and the impedance analyzer are respectively electrically connected with one end of the switch, the other end of the switch is electrically connected with the transducer, and the switch is used for controlling whether the excitation receiving circuit or the impedance analyzer is connected with the transducer; the data acquisition unit is electrically connected with the excitation receiving circuit and the impedance analyzer respectively and is used for acquiring the measurement data of the excitation receiving circuit and the impedance analyzer.

2. The transducer-characteristic detecting device according to claim 1, wherein: the side wall of the test box surrounds to form a test cavity, and the side wall is provided with an air hole which is communicated with the test cavity in the test box and the cavity in the temperature control box.

3. The transducer-characteristic detecting device according to claim 2, wherein: the diameter of the air hole is within the range of 1 mm-5 mm.

4. The transducer-characteristic detecting device according to claim 1, wherein: the fixing holes for fixing the transducers are coaxially distributed on opposite side wall surfaces of the test box in pairs; when the amplitude characteristic of the transducer signal is detected, the transducers are arranged in pairs in corresponding fixing holes on opposite side walls of the test box.

5. The transducer-characteristic detecting device according to claim 1, wherein: the change-over switch comprises two change-over sub-switches, each change-over sub-switch comprises a bidirectional switch and a plurality of one-way switches, one end of a double contact of the bidirectional switch is electrically connected with the excitation receiving circuit and the impedance analyzer respectively, one end of a single contact of the bidirectional switch is electrically connected with the plurality of one-way switches connected in parallel, and the other end of the one-way switch is used for being connected with the energy converter.

6. The transducer-characteristic detecting device according to claim 5, wherein: the bidirectional switch and the unidirectional switch are signal relays.

7. The transducer-characteristic detecting device according to claim 1, wherein: the test box comprises a pressing piece, and the pressing piece presses and fixes the transducer in the fixing hole through magnetic attraction.

8. A transducer characteristic detection method is characterized by comprising the following detection steps:

A1. mounting transducers to be detected in pairs in fixing holes on a test box;

A2. placing the test box provided with the transducer in a temperature control box;

A3. setting the temperature of a temperature control box, and carrying out signal amplitude characteristic detection or impedance characteristic detection after the temperature in the temperature control box reaches a set value and keeps stable, wherein the execution sequence of the signal amplitude characteristic detection and the impedance characteristic detection can be changed randomly;

A4. executing signal amplitude characteristic detection, and controlling a switch through a controller to electrically connect an excitation receiving circuit with a pair of transducers arranged in pairs; the primary signal amplitude characteristic detection process comprises at least one forward excitation detection process and at least one reverse excitation detection process; the excitation receiving circuit drives the transducer on one side to emit a sound wave signal under the control of the controller, the transducer on the opposite side receives the sound wave signal and converts the sound wave signal into an electric signal, and then the excitation receiving circuit and the data acquisition unit acquire amplitude characteristic information of the electric signal to finish one-time detection of a forward excitation process; then, the excitation receiving circuit drives the transducer on the other side to emit a sound wave signal, the transducer on the opposite side receives the sound wave signal and converts the sound wave signal into an electric signal, and then the excitation receiving circuit and the data acquisition unit acquire amplitude characteristic information of the electric signal to finish one-time reverse excitation process detection;

A5. keeping the temperature of the temperature control box unchanged, executing impedance characteristic detection, and controlling a selector switch through a controller to electrically connect the impedance analyzer with any transducer in the test box; the impedance analyzer measures the impedance characteristics of the transducer, and the data collector then collects impedance characteristic information.

9. The transducer characterization detection method of claim 8, further comprising the steps of:

B1. after the signal amplitude characteristic detection of one pair of transducers is executed, the temperature in the temperature control box is kept unchanged, and the controller controls the change-over switch to electrically connect the next pair of transducers with the excitation receiving circuit and detect the signal amplitude characteristic of the next pair of transducers; after the impedance characteristic detection of the pair of transducers is executed, the temperature in the temperature control box is kept unchanged, and the controller controls the change-over switch to electrically connect the next transducer with the impedance analyzer to detect the impedance characteristic of the next transducer.

10. The transducer characterization detection method of claim 8, further comprising the steps of:

C1. and after the signal amplitude characteristic detection and/or the impedance characteristic detection of all the transducers in the temperature control box are carried out, adjusting the temperature of the temperature control box to another set value, and after the temperature in the temperature control box is stabilized, sequentially carrying out the signal amplitude characteristic detection and/or the impedance characteristic detection on all the transducers in the temperature control box.

Background

The transducer is a device capable of converting electric energy and sound energy into each other, and is widely applied to different industries such as industry, national defense and the like. The performance of a transducer is closely related to the acoustic wave propagation medium. For example, in a cross-correlation time difference ultrasonic flowmeter, a pair of transducers is arranged in a measured fluid medium to transmit or receive ultrasonic waves in a counter direction, and since the ultrasonic waves are accelerated or decelerated due to the flow of the medium when propagating in the medium in a forward flow and a backward flow, the amplitude of the acceleration or deceleration is related to the flow rate of the medium, the flow rate of the medium can be calculated by measuring the time difference of the forward flow and the backward flow. In order to ensure the accurate measurement of the ultrasonic flowmeter, the signal amplitude characteristic, the impedance characteristic and other working characteristics of the transducer need to be detected.

The signal amplitude characteristic of the transducer refers to the characteristics of the waveform, the signal-to-noise ratio and the like of an effective signal generated by the transducer, and the impedance characteristic refers to the electrical impedance characteristic of the transducer. Because the working characteristics of the transducer functional material are affected by environmental conditions such as temperature, the amplitude characteristics and impedance characteristics of the transducer at different temperatures in the applicable range need to be detected; on the other hand, the temperature and the pressure of the sound wave propagation medium can affect the density and the sound wave propagation rate of the sound wave propagation medium, the signal amplitude characteristic of the transducer can be indirectly affected, and the control of the ambient temperature and the pressure stability is very important for detecting the working characteristic of the transducer. When the transducer is in operation, the signal amplitude characteristic and the impedance characteristic of the transducer simultaneously affect the working performance of the transducer, and the same ambient temperature and pressure conditions are expected to be adopted in the detection of the signal amplitude characteristic and the impedance characteristic so as to evaluate the working performance of the transducer more accurately.

In terms of signal amplitude characteristic detection of a transducer, the prior art generally detects a signal amplitude characteristic of a single transducer, which converts an electrical signal into an acoustic wave signal or converts an acoustic wave signal into an electrical signal. However, for the application scenario of the correlation ultrasonic flowmeter, the one-time complete signal transmission and conversion process of the transducers arranged in pairs comprises two links of transmitting ultrasonic waves and receiving the ultrasonic waves and converting the ultrasonic waves into electric signals, and the signal amplitude characteristic formed by the two links comprehensively is more important for the signal quality and the metering accuracy of the flowmeter. The existing signal amplitude detection scheme aiming at a single transducer cannot reflect the influence of factors such as impedance matching characteristics of paired transducers and the like on the signal amplitude characteristics in the sound wave transmitting process, and the situation that the performance of the transducer is good in single-transmitting detection and the performance of the transducer is degraded in the transmitting use can occur.

The existing transducer detection equipment is generally designed in a single function mode, multiple sets of detection equipment are needed to complete detection of multiple characteristics, the transducers need to be repeatedly disassembled and assembled on detection equipment with different characteristics continuously to complete detection of different characteristics of the transducers, the total time consumption period is long, the detection efficiency is low, and the environmental conditions in various detection processes are not convenient to keep unchanged.

Disclosure of Invention

The invention provides a transducer characteristic detection device and a method thereof, aiming at solving the problems that the detection function of detection equipment is single in the characteristic detection process of the existing transducer, and the transducer needs to be continuously and repeatedly disassembled and assembled on the detection equipment with different characteristics, so that the detection efficiency is low, and the environmental conditions such as temperature, pressure and the like in the detection process are inconvenient to control.

The invention adopts the following specific technical scheme for solving the technical problems: a transducer characteristic detecting device characterized by: the testing device comprises a testing box, a temperature control box and a detection assembly, wherein the testing box is arranged in the temperature control box, and a fixing hole for fixing an energy transducer is formed in the side wall of the testing box; the detection assembly comprises a controller, an excitation receiving circuit, an impedance analyzer, a selector switch and a data acquisition unit; the controller is respectively electrically connected with the excitation receiving circuit, the impedance analyzer and the switch, the excitation receiving circuit and the impedance analyzer are respectively electrically connected with one end of the switch, the other end of the switch is electrically connected with the transducer, and the switch is used for controlling whether the excitation receiving circuit or the impedance analyzer is connected with the transducer; the data acquisition unit is electrically connected with the excitation receiving circuit and the impedance analyzer respectively and is used for acquiring the measurement data of the excitation receiving circuit and the impedance analyzer. The functions of signal amplitude characteristic detection and impedance characteristic detection of the switching transducer and the sequential detection of multiple transducers are realized on the premise of not operating the temperature control box; the environmental temperature and the pressure in the whole detection process are kept stable, the detection error caused by the change of the working characteristics of the transducer due to the change of the environmental conditions is reduced, and the precision and the effectiveness of the detection of the working characteristics of the transducer are improved.

Preferably, the side wall of the test box surrounds to form a test cavity, and the side wall is provided with an air hole which is communicated with the test cavity in the test box and the inner cavity of the temperature control box. The influence of the airflow in the temperature control box on the ultrasonic transmission in the test box is reduced; the pressure change in the test cavity caused by temperature fluctuation is stabilized, and the influence of the pressure change on ultrasonic wave transmission is reduced; the accuracy of the detection of the working characteristics of the transducer is improved.

Preferably, the diameter of the air hole is in the range of 1mm to 5 mm. The influence of the air flow flowing through the air holes on the ultrasonic wave propagation is reduced; the accuracy of the detection of the working characteristics of the transducer is improved.

Preferably, the fixing holes for fixing the transducers are concentrically distributed in pairs on opposite side wall surfaces of the test box; when the amplitude characteristic of the transducer signal is detected, the transducers are arranged in pairs in corresponding fixing holes on opposite side walls of the test box. The method realizes the detection of the amplitude characteristics of the signals of the correlation type transducer, enables the matching characteristics of the transducer pair to be brought into a detection evaluation range, and improves the effectiveness of the detection of the amplitude characteristics of the signals of the transducer.

Preferably, the switch is composed of two switches, each switch is composed of a bidirectional switch and a plurality of unidirectional switches, one end of a double contact of the bidirectional switch is electrically connected with the excitation receiving circuit and the impedance analyzer respectively, one end of a single contact of the bidirectional switch is electrically connected with the plurality of unidirectional switches connected in parallel, and the other end of the unidirectional switch is used for being connected with the transducer. The automatic detection function switching and the detected transducer switching are realized, the stability of the detection environment condition is favorably kept, the detection precision and effectiveness of the working characteristic of the transducer are improved, and the detection efficiency is improved.

Preferably, the bidirectional switch and the unidirectional switch are signal relays. The method and the device have the advantages that no leakage current is generated when the switch is disconnected, noise electric signals are prevented from being generated or the transducer is undesirably excited to generate noise sound waves to interfere detection, and the working characteristic detection precision of the transducer is improved.

Preferably, the test box comprises a pressing piece, and the pressing piece presses and fixes the transducer in the fixing hole through magnetic attraction. The convenience of installing and detaching the transducer is improved, and the working efficiency of the transducer batch detection is improved.

A transducer characteristic detection method comprises the following detection steps:

A1. mounting transducers to be detected in pairs in fixing holes on a test box;

A2. placing the test box provided with the transducer in a temperature control box;

A3. setting the temperature of a temperature control box, and carrying out signal amplitude characteristic detection or impedance characteristic detection after the temperature in the temperature control box reaches a set value and keeps stable, wherein the execution sequence of the signal amplitude characteristic detection and the impedance characteristic detection can be changed randomly;

A4. executing signal amplitude characteristic detection, and controlling a switch through a controller to electrically connect an excitation receiving circuit with a pair of transducers arranged in pairs; the primary signal amplitude characteristic detection process comprises at least one forward excitation detection process and at least one reverse excitation detection process; the excitation receiving circuit drives the transducer on one side to emit a sound wave signal under the control of the controller, the transducer on the opposite side receives the sound wave signal and converts the sound wave signal into an electric signal, and then the excitation receiving circuit and the data acquisition unit acquire amplitude characteristic information of the electric signal to finish one-time detection of a forward excitation process; then, the excitation receiving circuit drives the transducer on the other side to emit a sound wave signal, the transducer on the opposite side receives the sound wave signal and converts the sound wave signal into an electric signal, and then the excitation receiving circuit and the data acquisition unit acquire amplitude characteristic information of the electric signal to finish one-time reverse excitation process detection;

A5. keeping the temperature of the temperature control box unchanged, executing impedance characteristic detection, and controlling a selector switch through a controller to electrically connect the impedance analyzer with any transducer in the test box; the impedance analyzer measures the impedance characteristics of the transducer, and the data collector then collects impedance characteristic information.

Preferably, the following B1 step can also be performed after the A1-A5 steps are performed to realize batch testing of multiple sets of transducers:

B1. after the signal amplitude characteristic detection of one pair of transducers is executed, the temperature in the temperature control box is kept unchanged, and the controller controls the change-over switch to electrically connect the next pair of transducers with the excitation receiving circuit and detect the signal amplitude characteristic of the next pair of transducers; after the impedance characteristic detection of one pair of transducers is executed, the temperature in the temperature control box is kept unchanged, and the controller controls the change-over switch to electrically connect the next transducer with the impedance analyzer to detect the impedance characteristic of the next transducer

Preferably, the following C1 step may also be performed after the steps a 1-a 5 are performed to achieve the detection of the operating characteristics of the transducer under multiple temperature conditions:

C1. and after the signal amplitude characteristic detection and/or the impedance characteristic detection of all the transducers in the temperature control box are carried out, adjusting the temperature of the temperature control box to another set value, and after the temperature in the temperature control box is stabilized, sequentially carrying out the signal amplitude characteristic detection and/or the impedance characteristic detection on all the transducers in the temperature control box.

The invention has the beneficial effects that:

the invention designs a transducer characteristic detection device and a transducer characteristic detection method, which complete the signal amplitude characteristic detection and impedance characteristic detection functions of a transducer in a temperature control box, reduce the assembly and disassembly operations in the transducer detection and improve the working efficiency; the method can keep stable detection environment temperature and pressure conditions when different detection functions and different transducers are detected, reduce errors caused by temperature regulation changes in the detection process, more accurately correspond and evaluate the signal amplitude characteristic and the impedance characteristic of the transducers at a certain temperature, and improve the effectiveness of the working characteristic detection of the transducers; the transducer is arranged on the test box, the test box is relatively closed and is provided with the air holes, so that the interference of air flow in the temperature control box on the transmission of ultrasonic waves can be reduced, the change of pressure in the test cavity caused by temperature fluctuation is inhibited, and the detection precision of the transducer is improved; the signal amplitude characteristic of the transducer is detected by adopting a correlation detection scheme, so that the matching characteristics of two paired transducers can be included in the detection result, and the effectiveness of the signal amplitude characteristic detection of the transducer is improved; the detection function switching and the switching of the transducer to be detected are completed by using the selector switch, so that the detection efficiency is improved, the damage to environmental conditions in the switching process is avoided, and the detection precision is improved; the change-over switch adopts the signal relay, eliminates the leakage current when the switch cuts off, is favorable to reducing the interference signal in the detection, improves and detects the precision.

Description of the drawings:

the invention is described in further detail below with reference to the figures and the detailed description.

Fig. 1 is a simplified schematic diagram of a transducer characteristic detecting apparatus of the present invention.

Fig. 2 is a schematic view of an assembly structure among the test cassette, the transducer, and the pressing member in the transducer characteristic detecting apparatus of the present invention.

Fig. 3 is a schematic view of a transducer pair-emitting mounting structure of the transducer characteristic detecting apparatus of the present invention.

Fig. 4 is a schematic circuit diagram of the transducer characteristic detecting device of the present invention.

Detailed Description

Example 1:

in the embodiment shown in fig. 1, 2, 3 and 4, the transducer characteristic detecting device comprises a temperature control box 1, a test box 2 and a detecting assembly. The temperature control box 1 can set the temperature of the inner cavity and maintain the temperature stable. The test box 2 is arranged in the inner cavity of the temperature control box 1, the test cavity 20 is arranged in the test box 2, and a plurality of fixing holes 5 for installing the tested transducer are distributed on the side wall of the test box 2. The detection component comprises a controller 91, an excitation receiving circuit 92, an impedance analyzer 93, a selector switch 90 and a data collector 95; the controller 91 is electrically connected with the excitation receiving circuit 92, the impedance analyzer 93 and the switch 90 respectively, the excitation receiving circuit 91 and the impedance analyzer 93 are electrically connected with one end of the switch 90 respectively, the other end of the switch 90 is electrically connected with the transducer 3, and the switch 90 is used for controlling whether the excitation receiving circuit 92 or the impedance analyzer 93 is connected with the transducer 3; the data collector 95 is electrically connected to the excitation receiving circuit 92 and the impedance analyzer 93, respectively, and is configured to collect measurement data of the excitation receiving circuit 92 and the impedance analyzer 93.

When the working characteristics of the transducer are detected, the transducer 3 is arranged on the test box 2, and the test box 2 is arranged in the temperature control box 1; the temperature of the temperature control box 1 is set, after a certain time, the ambient gas in the temperature control box 1 and the test box 2 are adjusted to the set temperature and are kept stable, and the ambient gas pressure is stable after the ambient gas temperature is stable. The controller 91 is used to operate the switch 90 to electrically connect the excitation receiving circuit 92 with the transducer 3, disconnect the impedance analyzer 93 from the telecommunication connection of the transducer 3, perform the detection of the amplitude characteristics of the signal of the transducer, and collect the detection data by the data collector 95. The excitation receiving circuit 92 can generate an excitation electrical signal to drive the transducer to emit ultrasonic waves, and can also collect an electrical signal converted from the ultrasonic waves by the transducer. After the detection of the amplitude characteristic of the signal is completed, the temperature of the temperature control box is kept unchanged, the controller 91 is used for operating the switch 90, so that the impedance analyzer 93 is electrically connected with the transducer 3, the telecommunication connection between the excitation receiving circuit 92 and the transducer 3 is disconnected, the impedance characteristic of the transducer is detected, and the detection data is collected by the data collector 95. The impedance analyzer 93 may send excitation electrical signals of different frequencies to the transducer 3 and evaluate the impedance characteristics of the transducer 3 from the received response electrical signals.

In the process of detecting the signal amplitude characteristic and the impedance characteristic of the transducer, the temperature control box 1 is not operated, the internal part of the temperature control box 1 and the environmental conditions of the test box 2 are kept stable, and the error caused by the change of the environmental conditions on the detection of the signal amplitude characteristic and the impedance characteristic of the transducer can be reduced to the greatest extent. Because the transducer does not need to be disassembled and assembled between the two detection processes, the detection efficiency of the transducer is improved.

The gas in the temperature control box 1 may generate convection due to temperature difference at different positions, and some temperature control boxes can actively drive the gas convection to accelerate the temperature regulation rate. In order to avoid the influence of the ambient air flow on the propagation of the ultrasonic waves, the test box 2 is configured in a relatively closed box-shaped structure, the side walls of the test box 2 surround to form an internal test cavity 20, and the side walls of the test box 2 are substantially closed except for a fixing hole 5 for mounting the transducer. However, the completely sealed sidewall of the testing box 2 may cause the pressure in the testing chamber 20 to be uncontrollable, and since the gas in the testing chamber 20 cannot be exchanged with the gas outside the testing chamber, the pressure in the testing chamber 20 will change after the temperature of the gas in the testing chamber 20 changes. In order to stabilize the difference between the pressure in the testing chamber 20 and the pressure outside the testing chamber 20 caused by the temperature change, the side wall of the testing box 2 is provided with an air hole 7 for communicating the testing chamber 20 and the ambient air outside the testing box. When the temperature of the gas in the test chamber 20 increases or decreases, the gas will be exhausted or enter the test chamber 20 through the gas hole 7 to maintain the same pressure in the test chamber 20 as the ambient gas pressure. Considering the influence of the air flow, the aperture of the air hole is not suitable to be too large; considering the influence of air change resistance and impact caused by over-high air flow velocity, the aperture of the air hole is not suitable to be too small; preferably, the diameter of the air holes 7 is set in the range of 1mm to 5 mm.

In order to more effectively evaluate the operating characteristics of the transducer in a butt-fired use scenario, the fixing holes 5 of the test cassette 2 may be arranged concentrically and in pairs on opposite side wall surfaces of the test cassette 2. When the transducer characteristic is detected, the transducers are arranged in pairs in the corresponding fixing holes 5 on the opposite side wall surfaces of the test box 2; the controller 91 controls the switch to electrically connect the excitation receiving circuit 92 with a pair of transducers installed in pairs; the primary signal amplitude characteristic detection process comprises at least one forward excitation detection process and at least one reverse excitation detection process; the excitation receiving circuit 92 drives the transducer on one side to emit a sound wave signal under the control of the controller 91, the transducer on the opposite side receives the sound wave signal and converts the sound wave signal into an electric signal, and then the excitation receiving circuit 92 and the data acquisition device 95 acquire amplitude characteristic information of the electric signal to complete one-time detection of a forward excitation process; then, the excitation receiving circuit 92 drives the transducer on the other side to emit a sound wave signal, the transducer on the opposite side receives the sound wave signal and converts the sound wave signal into an electric signal, and then the excitation receiving circuit 92 and the data acquisition unit 95 acquire amplitude characteristic information of the electric signal to complete one-time detection of the reverse excitation process. The correlation detection scheme completely comprises the process of converting an excitation electric signal into sound waves through a transmitting transducer and converting a receiving transducer into a receiving electric signal, measures the signal amplitude characteristic after the whole transmission process, and comprises the detection of the correlation directions of the forward sound waves and the reverse sound waves, so that the working characteristics including the matching characteristics of the transducers arranged in pairs can be reflected, and the working performance of the transducers can be evaluated more comprehensively and effectively.

In order to improve the detection efficiency of the transducer, a plurality of pairs of fixing holes 5 are arranged on the test box 2; the switch 90 is composed of two switches 93, each switch 93 is composed of a bidirectional switch 93a and a plurality of unidirectional switches 93b, one end of a double contact of the bidirectional switch 93a is electrically connected with the excitation receiving circuit 92 and the impedance analyzer 94, one end of a single contact of the bidirectional switch 93a is electrically connected with the plurality of unidirectional switches 93b connected in parallel, and the other end of the unidirectional switch 93b is used for being connected with the transducer. When the working characteristics of the transducers are detected, firstly, all the transducers 3 to be detected are installed on the test box 2, and each transducer 3 is electrically connected with the corresponding one-way switch 93 b; the controller 91 is electrically connected to each of the bidirectional switch 93a and the unidirectional switch 93 b. The controller 91 operates the bidirectional switch 93a to select the excitation receiving circuit 92 or the impedance analyzer 94 to be electrically connected with the transducer to be tested, i.e. to select the detection function of the device; the transducer accessed by the detection assembly for detection may be selected by the controller 91 operating the one-way switch 93 b. When detecting the signal amplitude characteristic of the transducer, the selector switch 93 selectively switches on one side of the excitation receiving circuit 92, switches on the one-way switches 93b connected to the transducers installed in pairs, and switches off the other one-way switches 93 b; after the detection of the signal amplitude characteristics of one pair of transducers is completed, the one-way switch 94b for connecting the current transducer pair is turned off, and the one-way switch 93b for connecting the next transducer pair is turned on. When the impedance characteristics of the transducers are detected, the switching sub-switch 93 selectively switches on one side of the impedance analyzer 94, switches on the one-way switch 93b connected with a single transducer, and switches off the other one-way switches 93 b; after the impedance characteristic detection of the single transducer is completed, the one-way switch 93b of the present transducer connection is turned off, and the one-way switch 93b of the next transducer connection is turned on. The automatic operation function is realized by adopting the change-over switch, and the signal amplitude characteristic detection and the impedance characteristic detection of each transducer can be completed in sequence under the conditions that the temperature control box 1 is not opened and the detection environment condition is not damaged. Preferably, the bidirectional switch 93a and the unidirectional switch 93b are signal relays, so that no leakage current can be ensured when the switches are disconnected, and generation of noise electric signals or generation of noise sound waves for interference detection due to unexpected excitation of the transducers can be avoided.

The test box 2 can be provided with a pressing piece 6 matched with the fixing hole 5, the pressing piece 6 is partially or completely arranged in the fixing hole 5, the transducer is arranged in a space area formed by matching between the fixing hole 5 and the pressing piece 6, the pressing piece 6 is tightly attached to the outer side of the transducer, and the transducer is stably and reliably limited in the fixing hole through the attractive magnetic force between the pressing piece 6 and the fixing hole 5. The quick assembly operation of the transducer is realized by adopting the pressing piece 6, and the assembly and disassembly efficiency of the transducer during batch detection can be improved.

Example 2:

in the embodiment shown in fig. 1, 2, 3 and 4, a transducer characteristic detection method comprises the following detection steps:

A1. mounting transducers to be detected in pairs in fixing holes on a test box;

A2. placing the test box provided with the transducer in a temperature control box;

A3. setting the temperature of a temperature control box, and carrying out signal amplitude characteristic detection or impedance characteristic detection after the temperature in the temperature control box reaches a set value and keeps stable, wherein the execution sequence of the signal amplitude characteristic detection and the impedance characteristic detection can be changed randomly;

A4. executing signal amplitude characteristic detection, and controlling a switch through a controller to electrically connect an excitation receiving circuit with a pair of transducers arranged in pairs; the primary signal amplitude characteristic detection process comprises at least one forward excitation detection process and at least one reverse excitation detection process; the excitation receiving circuit drives the transducer on one side to emit a sound wave signal under the control of the controller, the transducer on the opposite side receives the sound wave signal and converts the sound wave signal into an electric signal, and then the excitation receiving circuit and the data acquisition unit acquire amplitude characteristic information of the electric signal to finish one-time detection of a forward excitation process; then, the excitation receiving circuit drives the transducer on the other side to emit a sound wave signal, the transducer on the opposite side receives the sound wave signal and converts the sound wave signal into an electric signal, and then the excitation receiving circuit and the data acquisition unit acquire amplitude characteristic information of the electric signal to finish one-time reverse excitation process detection;

A5. keeping the temperature of the temperature control box unchanged, executing impedance characteristic detection, and controlling a selector switch through a controller to electrically connect the impedance analyzer with any transducer in the test box; the impedance analyzer measures the impedance characteristics of the transducer, and the data collector then collects impedance characteristic information.

The following B1 steps may also be performed after the A1-A5 steps are performed to achieve batch testing of multiple sets of transducers:

B1. after the signal amplitude characteristic detection of one pair of transducers is executed, the temperature in the temperature control box is kept unchanged, and the controller controls the change-over switch to electrically connect the next pair of transducers with the excitation receiving circuit and detect the signal amplitude characteristic of the next pair of transducers; after the impedance characteristic detection of one pair of transducers is executed, the temperature in the temperature control box is kept unchanged, and the controller controls the change-over switch to electrically connect the next transducer with the impedance analyzer to detect the impedance characteristic of the next transducer

The following C1 step may also be performed after the steps A1-A5 are performed to achieve the detection of the operating characteristics of the transducer under multiple temperature conditions:

C1. and after the signal amplitude characteristic detection and/or the impedance characteristic detection of all the transducers in the temperature control box are carried out, adjusting the temperature of the temperature control box to another set value, and after the temperature in the temperature control box is stabilized, sequentially carrying out the signal amplitude characteristic detection and/or the impedance characteristic detection on all the transducers in the temperature control box.

In the positional relationship description of the present invention, the appearance of terms such as "inner", "outer", "upper", "lower", "left", "right", etc., indicating the orientation or positional relationship based on the orientation or positional relationship shown in the drawings is merely for convenience of describing the embodiments and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed in a specific orientation and operation, and thus, is not to be construed as limiting the present invention.

The foregoing summary and structure are provided to explain the principles, general features, and advantages of the product and to enable others skilled in the art to understand the invention. The foregoing examples and description have been presented to illustrate the principles of the invention and are intended to provide various changes and modifications within the spirit and scope of the invention as claimed. The scope of the invention is defined by the appended claims and equivalents thereof.