1. The nuclear radiation detection device capable of transmitting the original signal in a long distance is characterized by comprising a detector (1) positioned in a measurement area and a signal amplifier (10) positioned at a remote position, wherein the detector (1) is connected with the signal amplifier (10) through a coaxial cable (8), a high-voltage-resistant connector is arranged between the detector (1) and the coaxial cable (8), and an anode (4) of the detector is communicated with a wire core (7) of the coaxial cable through a signal conduit (6) of the high-voltage-resistant connector, so that the signal transmission is realized.

2. The nuclear radiation detection device capable of transmitting original signals for long distance according to claim 1, wherein the high voltage resistant connector comprises a housing (3) capable of being connected with the detector, a ceramic insulating layer (5) is arranged in the housing (3), the signal conduit (6) is arranged in the ceramic insulating layer (5), and two ends of the signal conduit (6) are respectively connected with the anode (4) of the detector and the core (7) of the coaxial cable.

3. The nuclear radiation detection device capable of transmitting raw signals over long distances according to claim 2, characterized in that the housing (3) of the high voltage resistant connector is connected to the detector (1) by a thread (2) at one end and is welded to the metal housing of the coaxial cable (8) at the other end.

4. The nuclear radiation detection device capable of transmitting raw signals over long distances according to claim 2, wherein the signal conduit (6) of the high voltage resistant connector is a gold plated copper tube.

5. The nuclear radiation detection device capable of transmitting raw signals over long distances according to claim 2, wherein the housing (3) of the high voltage resistant connector is made of stainless steel.

6. The nuclear radiation detection device capable of transmitting raw signals over long distances according to claim 1, wherein the detector (1) is selected from a gamma ionization chamber or a neutron counter tube.

7. The nuclear radiation detection device capable of transmitting raw signals over long distances according to claim 1, characterized in that the core (7) of the coaxial cable is selected to be a low impedance and low attenuation core matched to the detector and the signal amplifier.

8. The nuclear radiation detection device capable of transmitting original signals for a long distance according to claim 1, wherein a fully sealed metal shell (9) for providing electromagnetic shielding is arranged outside the signal amplifier (10), and the signal amplifier amplifies the original signals input by the coaxial cable and outputs the amplified signals to the signal acquisition and processing equipment.

Background

The original signal generated by the nuclear radiation detector is very weak, so that the original signal needs to be connected with a signal amplifier to be amplified and then transmitted to a main amplifier or signal acquisition equipment for signal processing, the detector is usually directly connected with the signal amplifier, the length of a lead is only a few centimeters, in some application scenes, the position of the detector has strong nuclear radiation or higher temperature, the detector cannot be damaged at the moment, the amplifier cannot tolerate the damage of environmental conditions due to a large number of electronic components, and a shielding body or cooling equipment cannot be additionally arranged outside the detector due to the limitation of installation space or weight, so that the traditional nuclear radiation detector cannot stably work for a long time under strong radiation or high temperature without taking engineering measures.

Disclosure of Invention

The invention aims to overcome the defects of the prior art and provide a scheme for arranging a detector and a signal amplifier in a long-distance separation mode, so that a nuclear radiation detection device capable of transmitting an original signal for a long distance by using a coaxial cable is formed.

The technical scheme of the invention is as follows: a nuclear radiation detection device capable of transmitting original signals in a long distance comprises a detector and a signal amplifier, wherein the detector is located in a measurement area, the signal amplifier is located in a remote position, the detector is connected with the signal amplifier through a coaxial cable, a high-voltage-resistant connector is arranged between the detector and the coaxial cable, and an anode of the detector is communicated with a wire core of the coaxial cable through a signal conduit of the high-voltage-resistant connector, so that the signals are transmitted.

Further, the nuclear radiation detection device capable of transmitting the original signal in a long distance as described above, wherein the high voltage resistant connector includes a housing capable of being connected to the detector, a ceramic insulating layer is provided in the housing, the signal conduit is provided in the ceramic insulating layer, and two ends of the signal conduit are respectively connected to the anode of the detector and the core of the coaxial cable.

Still further, the nuclear radiation detecting device capable of transmitting original signals over a long distance as described above, wherein the housing of the high voltage resistant connector is connected to the detector at one end by a screw thread, and is welded to the metal housing of the coaxial cable at the other end.

Further, the nuclear radiation detecting device capable of transmitting original signals for a long distance as described above, wherein the signal conduit of the high voltage resistant connector is a gold-plated copper tube.

Further, the nuclear radiation detecting device capable of transmitting the original signal over a long distance as described above, wherein the housing of the high voltage resistant connector is made of stainless steel.

Further, the nuclear radiation detecting device capable of transmitting the original signal in a long distance as described above, wherein the detector may be a gamma ionization chamber or a neutron counter tube.

Further, the nuclear radiation detecting device capable of transmitting original signals over long distances as described above, wherein the core of the coaxial cable is selected to have a low impedance and a low attenuation core matched with the detector and the signal amplifier.

Further, the nuclear radiation detection device capable of transmitting the original signal in a long distance as described above, wherein a fully sealed metal casing for providing electromagnetic shielding is disposed outside the signal amplifier, and the signal amplifier amplifies the original signal input by the coaxial cable and outputs the amplified signal to the signal acquisition and processing device.

The invention has the following beneficial effects: according to the nuclear radiation measuring device, the detector and the signal amplifier are connected through the coaxial cable through the connection design of the high-voltage-resistant connector, so that the nuclear radiation measuring device is formed, wherein the detector and the signal amplifier are arranged separately, and the coaxial cable is used for transmitting an original signal in a long distance. The device only has the detector positioned in a measuring area and can bear strong radiation and high temperature, and the signal amplifier is positioned at a remote position with proper environmental conditions, so that the device can be ensured to reliably work for a long time.

Drawings

Fig. 1 is a schematic structural diagram of a nuclear radiation detection device capable of transmitting an original signal over a long distance according to an embodiment of the present invention;

fig. 2 is a partially enlarged view of fig. 1.

In the figure, 1. a detector; 2. a thread; 3. a high voltage tolerant connector housing; 4. a detector anode; 5. a ceramic insulating layer; 6. a signal conduit; 7. a coaxial cable core; 8. a coaxial cable; 9. a signal amplifier housing; 10. a signal amplifier.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.

As shown in fig. 1 and fig. 2, the invention provides a nuclear radiation detection device capable of transmitting original signals in a long distance, which includes a detector 1 located in a measurement area and a signal amplifier 10 located in a remote suitable environment condition position, the detector 1 and the signal amplifier 10 are connected by a coaxial cable 8, the original signals detected by the detector are transmitted to the signal amplifier through the coaxial cable, so that long-distance transmission of the original signals is realized, and the signal amplifier amplifies the original signals and outputs the amplified signals to a signal acquisition and processing device. The environment of the signal amplifier does not have strong radiation and high temperature, thereby ensuring that the device can reliably work for a long time.

The key point of the invention is the special connection structure design, a high voltage resistant connector is arranged between the detector 1 and the coaxial cable 8, and the anode 4 of the detector is communicated with the wire core 7 of the coaxial cable through a signal conduit of the high voltage resistant connector, thereby realizing the transmission of signals. The high-voltage-resistant connector comprises a shell 3 which can be connected with the detector 1, a ceramic insulating layer 5 is arranged in the shell 3, a signal conduit 6 is arranged in the ceramic insulating layer 5, and two ends of the signal conduit 6 are respectively connected with an anode 4 of the detector and a wire core 7 of the coaxial cable. The signal conduit 6 of the high voltage resistant connector realizes the function of signal transmission, the detection signal is transmitted to the wire core 7 of the coaxial cable from the anode 4 of the detector, and the ceramic insulating layer can ensure that the connector bears high voltage because the coaxial cable needs to apply high voltage on the anode of the detector. The core 7 of the coaxial cable transmits the original weak signal detected by the detector 1 to the signal amplifier 10.

The structure and function of each component are described separately below:

the detector 1 can be a gamma ionization chamber or a neutron counting tube selected as a radiation detector, and can respectively and correspondingly measure gamma rays and neutrons and select the detector according to different measurement purposes.

And the thread connection structure 2 is connected with the detector 1 through the thread 2, so that the functions of fixing and grounding are achieved.

The high-voltage resistant connector shell 3 is made of stainless steel materials, one end of the shell is connected with the detector 1 through threads 2, and the other end of the shell is welded with the metal shell of the coaxial cable 8, so that the functions of fixing and grounding are achieved.

The detector anode 4 outputs a weak signal (current or voltage pulse signal) measured by the detector.

The ceramic insulating layer 5 of the high voltage resistant connector is arranged in the shell 3, and the ceramic insulating material is needed to ensure that the high voltage resistant connector can bear the high voltage of 3000V because the coaxial cable needs to increase the voltage on the anode.

The high-voltage resistant connector signal conduit 6 is made of a pure gold plated oxygen-free copper pipe, the detector anode 4 is directly inserted into one end of the signal conduit, the inner diameter of the conduit is slightly larger than the outer diameter of the anode (the range is 0.2mm-0.5mm), smooth insertion and signal conduction can be ensured, and the other end of the signal conduit is welded by tin soldering after being inserted into the coaxial cable core 7 and is used for transmitting signals.

The coaxial cable core 7 has the functions of providing high voltage for the detector and transmitting the original weak signal of the detector, and can reduce the loss as much as possible in a long distance by selecting a low-impedance (not more than 0.09 omega/m) and low-attenuation (50m signal attenuation rate is not more than 3%) core matched with the detector and a signal amplifier.

The outer layer of the coaxial cable is composed of a plurality of layers of insulating materials, a metal shielding layer, a metal shell and the like, and provides good insulation and electromagnetic shielding for signals.

The signal amplifier housing 9, a fully sealed metal structure, provides good electromagnetic shielding for the signal amplifier.

And the signal amplifier 10 is used for selecting amplifiers of different types according to the type of the detector, amplifying the original signal input by the coaxial cable and outputting the amplified signal to signal acquisition and processing equipment.

The device is actually tested, original signals of the detector can still be effectively transmitted by using the coaxial cable of 20 meters, and the detector is tested at the high temperature of 100 ℃ for 72 hours, so that the device can stably work in a strong gamma radiation field and at high temperature, and the measurement requirements under the conditions of the strong gamma radiation field and the high temperature environment are effectively met.

It will be evident to those skilled in the art that the invention is not limited to the details of the foregoing illustrative embodiments, and that the present invention may be embodied in other specific forms without departing from the spirit or essential attributes thereof. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Any reference sign in a claim should not be construed as limiting the claim concerned.

Furthermore, it should be understood that although the present description refers to embodiments, not every embodiment may contain only a single embodiment, and such description is for clarity only, and those skilled in the art should integrate the description, and the embodiments may be combined as appropriate to form other embodiments understood by those skilled in the art.