1. A multi-channel atomic filtering day and night automatic switching device comprises a telescope, and is characterized by also comprising an optical fiber, a collimating mirror, an atomic filter, a focusing mirror and a photoelectric detector which correspond to the telescope, wherein the atomic filter is arranged on a sliding platform (32),

when the motor (15) drives the sliding platform (32) to move to the head end of the stroke, the atomic filter is inserted into a light path between the collimating lens and the focusing lens: the telescope inputs the received optical signal to one end of the optical fiber, the other end of the optical fiber outputs the optical signal and enters the collimating mirror through the light through hole on the chopping disk (31) for collimation, and the collimated light is focused on the photoelectric detector after passing through the atomic filter and the focusing mirror;

when the motor (15) drives the sliding platform (32) to move to the tail end of the stroke, the atomic filter moves out of a light path between the collimating lens and the focusing lens: the telescope inputs the received optical signal to one end of the optical fiber, the other end of the optical fiber outputs the optical signal and enters the collimating mirror through the light through hole on the chopping disk (31) for collimation, and the collimated light is focused on the photoelectric detector through the focusing mirror.

2. The day-night automatic multi-channel atomic filter switching device according to claim 1, further comprising an ambient photodetector (30), a computer (29), a switching controller (28), a first limit switch (13) and a second limit switch (14),

an ambient light detector (30) for converting ambient light signals into electrical signals for input to a computer (29),

a computer (29) for controlling the rotation direction of the motor (15) through a switching controller (28) according to the ambient light signal so as to drive the sliding platform (32) to move to the stroke head end or drive the sliding platform (32) to move to the stroke tail end,

when the sliding platform (32) moves to the head end of the stroke, the first limit switch (13) is closed, the second limit switch (14) is not closed, when the sliding platform (32) moves to the tail end of the stroke, the first limit switch (13) is not closed, the second limit switch (14) is closed, and the first limit switch (13) and the second limit switch (14) send a state signal of whether the first limit switch (13) and the second limit switch (14) are closed to the computer (29) through the switching controller (28).

3. A multi-channel atomic filtering day and night automatic switching method, which utilizes the multi-channel atomic filtering day and night automatic switching device of claim 2, and is characterized by comprising the following steps:

step one, turning on a computer (29), driving a sliding platform (32) to move to the head end of a stroke through a switching controller (28) and a motor (15),

step two, reading an ambient light illumination value fed back by an ambient photoelectric detector (30) in real time by using a computer (29), switching state signals of a first limit switch (13) and a second limit switch (14) obtained by a controller (28) and feeding back the state signals to the computer (29),

step three, the computer (29) selects a switching mode: when the automatic switching mode is selected, skipping to the fourth step; when the manual switching mode is selected, the manual operation computer (29) controls the sliding platform (32) to move to the stroke head end or the stroke tail end through the switching controller (28) and the motor (15), and jumps to the fifth step,

step four, if the ambient light illumination value is less than or equal to the set light illumination threshold value, then:

the computer (29) controls the sliding platform (32) to move to the tail end of the stroke through the switching controller (28) and the motor (15), the atom filter moves out of the light path between the collimating mirror and the focusing mirror, and the step five is skipped,

if the ambient illuminance value is greater than the set illuminance threshold value:

the computer (29) controls the sliding platform (32) to move to the head end of the stroke through the switching controller (28) and the motor (15), the atom filter is inserted into the light path between the collimating mirror and the focusing mirror, and the step five is skipped,

step five, if the signal of the first limit switch (13) is closed, the second limit switch (14) is open, and the ambient light illumination value of the ambient photoelectric detector (30) is greater than the set light illumination threshold value; or the signal of the first limit switch (13) is open, the signal of the second limit switch (14) is closed, and the ambient illuminance value of the ambient photoelectric detector (30) is less than or equal to the set illuminance threshold value, then the step two is skipped;

otherwise, the computer (29) sends fault information to the staff for early warning, and the step two is skipped.

Background

The wind temperature detection laser radar can simultaneously obtain parameters such as an atmospheric wind field, temperature, density and the like, and becomes one of important detection equipment for atmospheric detection. As wind field detection is based on the Doppler frequency shift principle, the measurement of a speed field can only obtain a speed scalar in the view direction, and in order to obtain an atmospheric vector wind field, three telescopes are usually adopted to respectively align to the vertical zenith direction, deviate from the zenith direction by 20-30 degrees in the north direction (or south direction), and deviate from the zenith direction by 20-30 degrees in the east direction (or west direction), and then the three directions are simultaneously measured and synthesized into a vector wind field (OPTICS EXPRESS,2017,25(5): 5264 and 5278), so that a wind temperature laser radar signal detection system usually adopts multi-channel simultaneous detection. The working wavelength of the wind temperature laser radar is usually in a visible light band which is particularly obviously influenced by sunlight, the signal change range of the wind temperature laser radar can reach 4-5 orders of magnitude, which is extremely unfavorable for the weak echo signal detected by atmospheric Rayleigh scattering or resonance fluorescence, so that in the daytime, an optical filter device with ultra-narrow bandwidth and high out-of-band inhibition capability, such as an atomic filter, a birefringent filter and the like, is required to be adopted so as to effectively inhibit the daytime sky background light noise (Applied Optics,2020,59(6): 1529-; at night, because the background light signal is weak, the narrow-band interference filter can effectively suppress the background light noise of the starry sky at night, and therefore the ultra-narrow-band filter device is removed at night to improve the signal intensity of the echo signal at night. Therefore, the two working modes of the laser radar at night and in the daytime usually need to be manually removed or inserted, the manual switching mode needs to be attended, an operator manually switches according to the brightness of the sky, and if the operator forgets to switch the working modes in the daytime, the high-sensitivity photoelectric detector is likely to be damaged.

Disclosure of Invention

The invention aims to solve the problems in the prior art and provides a multi-channel atomic filtering day and night automatic switching device which has the simultaneous detection capability of multiple paths of echo signals, realizes the automatic monitoring of the observation light intensity of a telescope according to an environmental photoelectric detector arranged beside the telescope, and realizes the automatic switching according to a set illuminance threshold value. If the ambient light illumination value exceeds the illumination threshold value, the atomic filter is inserted into a light path between the collimating mirror and the focusing mirror, so that a daytime working mode is realized; and if the ambient light illumination value is lower than the illumination threshold value, the atomic filter moves out of the light path between the collimating lens and the focusing lens, so that the night working mode is realized. Of course, the switching mode also has a manual mode in which the daytime/nighttime operation mode can be manually controlled.

The above object of the present invention is achieved by the following technical solutions:

a multi-channel automatic day and night switching device for atomic light filter is composed of telescope, optical fibres, collimator, atomic light filter, focusing lens and photoelectric detector,

when the motor drives the sliding platform to move to the head end of the stroke, the atomic filter is inserted into a light path between the collimating lens and the focusing lens: the telescope inputs the received optical signal to one end of the optical fiber, the other end of the optical fiber outputs the optical signal and enters the collimating mirror through the light through hole on the chopper disk for collimation, and the collimated light is focused on the photoelectric detector after passing through the atomic filter and the focusing mirror;

when the motor drives the sliding platform to move to the stroke tail end, the atomic filter moves out of a light path between the collimating mirror and the focusing mirror: the telescope inputs the received optical signal to one end of the optical fiber, the other end of the optical fiber outputs the optical signal and enters the collimating mirror through the light through hole on the chopper disk for collimation, and the collimated light is focused on the photoelectric detector through the focusing mirror.

A multi-channel atomic light-filtering day and night automatic switching device also comprises an environmental photoelectric detector, a computer, a switching controller, a first limit switch and a second limit switch,

an environment photoelectric detector for converting the environment light signal into electric signal and inputting the electric signal into a computer,

the computer is used for controlling the rotation direction of the motor through the switching controller according to the ambient light signal so as to drive the sliding platform to move to the head end of the stroke or drive the sliding platform to move to the tail end of the stroke,

when the sliding platform moves to the stroke head end, the first limit switch is closed, the second limit switch is not closed, when the sliding platform moves to the stroke tail end, the first limit switch is not closed, the second limit switch is closed, and the first limit switch and the second limit switch send a state signal of whether the first limit switch and the second limit switch are closed or not to the computer through the switching controller.

A multichannel atomic light filtering day and night automatic switching method comprises the following steps:

step one, turning on a computer, driving a sliding platform to move to the head end of a stroke through a switching controller and a motor,

step two, reading the ambient light illumination value fed back by the ambient photoelectric detector in real time by using a computer, switching the state signals of the first limit switch and the second limit switch obtained by the controller and feeding back the state signals to the computer,

step three, selecting a switching mode by the computer: when the automatic switching mode is selected, skipping to the fourth step; when the manual switching mode is selected, the manual operation computer controls the sliding platform to move to the stroke head end or the stroke tail end through the switching controller and the motor, and skips to the fifth step,

step four, if the ambient light illumination value is less than or equal to the set light illumination threshold value, then:

the computer controls the sliding platform to move to the tail end of the stroke through the switching controller and the motor, the atom filter moves out of the light path between the collimating lens and the focusing lens, and the fifth step is skipped,

if the ambient illuminance value is greater than the set illuminance threshold value:

the computer controls the sliding platform to move to the head end of the stroke through the switching controller and the motor, the atomic filter is inserted into the light path between the collimating lens and the focusing lens, and the fifth step is skipped,

step five, if the first limit switch signal is closed, the second limit switch is open, and the ambient light illumination value of the ambient photoelectric detector is greater than the set light illumination threshold value; or the first limit switch signal is open, the second limit switch signal is closed, and the ambient light illumination value of the ambient photoelectric detector is less than or equal to the set illumination threshold value, then the step two is skipped;

otherwise, the computer sends the fault information to the staff for early warning, and jumps to the step two.

Compared with the prior art, the invention has the following beneficial effects:

the invention provides a multi-channel atomic light filtering day and night automatic switching device which can simultaneously control the insertion and the removal of high-performance light filtering systems such as a multi-channel atomic light filter and the like and is used for simultaneously detecting multi-channel signals. The invention utilizes the environment photoelectric detector to monitor the illumination environment around the laser radar receiving telescope in real time, and combines the illumination threshold value to distinguish two working modes of the laser radar at daytime and night.

Drawings

FIG. 1 is a schematic diagram of a multi-channel atomic light-filtering day-night automatic switching device.

FIG. 2 is a design diagram of a chopping disk and first, second, third, and fourth optical fibers;

wherein, 1-a first telescope, 2-a second telescope, 3-a third telescope, 4-a fourth telescope, 5-a first optical fiber, 6-a second optical fiber, 7-a third optical fiber, 8-a fourth optical fiber, 9-a first collimating mirror, 10-a second collimating mirror, 11-a third collimating mirror, 12-a fourth collimating mirror, 13-a first limit switch, 14-a second limit switch, 15-a motor, 16-a first atom filter, 17-a second atom filter, 18-a third atom filter, 19-a fourth atom filter, 20-a first focusing mirror, 21-a second focusing mirror, 22-a third focusing mirror, 23-a fourth focusing mirror, 24-a first photoelectric detector, 25-a second photoelectric detector, 26-third photoelectric detector, 27-fourth photoelectric detector, 28-switching controller, 29-computer, 30-environment photoelectric detector, 31-chopping disk, 32-sliding platform and 33-light-through hole.

Detailed Description

The present invention will be described in further detail with reference to examples for the purpose of facilitating understanding and practice of the invention by those of ordinary skill in the art, and it is to be understood that the present invention has been described in the illustrative embodiments only and is not to be construed as limiting the present invention.

As shown in fig. 1, a multi-channel atomic filtering day and night automatic switching device includes: the telescope comprises a first telescope 1, a second telescope 2, a third telescope 3, a fourth telescope 4, a first optical fiber 5, a second optical fiber 6, a third optical fiber 7, a fourth optical fiber 8, a first collimating mirror 9, a second collimating mirror 10, a third collimating mirror 11, a fourth collimating mirror 12, a first limit switch 13, a second limit switch 14, a motor 15, a first atom filter 16, a second atom filter 17, a third atom filter 18, a fourth atom filter 19, a first focusing mirror 20, a second focusing mirror 21, a third focusing mirror 22, a fourth focusing mirror 23, a first photoelectric detector 24, a second photoelectric detector 25, a third photoelectric detector 26, a fourth photoelectric detector 27, a switching controller 28, a computer 29, an environment photoelectric detector 30, a chopper wheel 31 and a sliding platform 32.

The switching system composed of the environment photoelectric detector 30, the computer 29, the switching controller 28, the first limit switch 13, the second limit switch 14, the motor 15 and the sliding platform 32 is a core component of the invention. The computer 29 is connected to the ambient photo detector 30 and the switching controller 28, the ambient photo detector 30 converts the ambient light signal into an electrical signal and inputs the electrical signal to the computer 29, and the computer 29 drives the switching controller 28 to control the motor 15. The motor 15 is connected with a screw rod on the sliding platform 32, the screw rod penetrates through the sliding platform 32 and forms a ball screw structure with the sliding platform 32, and when the motor 15 drives the screw rod to rotate, the sliding platform 32 moves along the screw rod. The first atomic filter 16, the second atomic filter 17, the third atomic filter 18 and the fourth atomic filter 19 are arranged on the sliding platform 32, the first limit switch 13 and the second limit switch 14 are respectively installed at the stroke head end and the stroke tail end of the sliding platform 32, and the first limit switch 13 and the second limit switch 14 are used for controlling the motor 15 to be opened and closed.

When the computer 29 controls the motor 15 to rotate through the switching controller 28, and drives the sliding platform 32 to move to the head end of the stroke, the first limit switch 13 is closed, the second limit switch 14 is not closed, and the atom filter is located in the light path between the corresponding collimating mirror and the focusing mirror, that is:

the first telescope 1 is responsible for receiving a first optical signal generated after interaction between laser emitted by a laser radar and the atmosphere, the first optical signal enters a first optical fiber 5 and then enters a first collimating mirror 9 through a light through hole in a chopper disc 31 for collimation, and the collimated light is focused on a first photoelectric detector 24 through a first atomic filter 16 and a first focusing mirror 20;

the second telescope 2 is responsible for receiving a second optical signal generated after interaction between laser emitted by the laser radar and the atmosphere, the second optical signal enters the second optical fiber 6 and then enters the second collimating mirror 10 through a light through hole in the chopper disk 31 for collimation, and the collimated light passes through the second atomic optical filter 17 and the second focusing mirror 21 and then is focused on the second photoelectric detector 25;

the third telescope 3 is responsible for receiving a third optical signal generated after interaction between laser emitted by the laser radar and the atmosphere, the third optical signal enters the third optical fiber 7, enters the third collimating mirror 11 through a light through hole in the chopper disk 31 for collimation, and the collimated light passes through the third atomic filter 18 and the third focusing mirror 22 and then is focused on the third photoelectric detector 26;

the fourth telescope 4 is responsible for receiving a fourth optical signal generated after interaction between laser emitted by the laser radar and the atmosphere, the fourth optical signal enters the fourth optical fiber 8 and then enters the third collimator 11 through a light through hole in the chopper plate 31 for collimation, and the collimated light is focused on the fourth photoelectric detector 27 through the fourth atomic filter 19 and the fourth focusing lens 23.

When the computer 29 controls the motor 15 to rotate through the switching controller 28, and drives the sliding platform 32 to move to the stroke end, the first limit switch 13 is not closed, the second limit switch 14 is closed, and the atomic filter is removed from the light path between the collimating mirror and the corresponding focusing mirror, that is:

the first telescope 1 is responsible for receiving a first optical signal generated after interaction between laser emitted by a laser radar and the atmosphere, the first optical signal enters a first optical fiber 5 and then enters a first collimating mirror 9 through a light through hole in a chopper disc 31 for collimation, and the collimated light is focused on a first photoelectric detector 24 through a first focusing mirror 20;

the second telescope 2 is responsible for receiving a second optical signal generated after interaction between laser emitted by the laser radar and the atmosphere, the second optical signal enters the second optical fiber 6 and then enters the second collimating mirror 10 through a light through hole in the chopper disk 31 for collimation, and the collimated light is focused on the second photoelectric detector 25 through the second focusing mirror 21;

the third telescope 3 is responsible for receiving a third optical signal generated after interaction between laser emitted by the laser radar and the atmosphere, the third optical signal enters the third optical fiber 7, enters the third collimating mirror 11 through a light through hole in the chopper disk 31 for collimation, and the collimated light is focused on the third photoelectric detector 26 through the third focusing mirror 22;

the fourth telescope 4 is responsible for receiving a fourth optical signal generated after interaction between laser emitted by the laser radar and the atmosphere, the fourth optical signal enters the fourth optical fiber 8 and then enters the fourth collimating mirror 12 through a light through hole in the chopper plate 31 for collimation, and the collimated light is focused on the fourth photoelectric detector 27 by the fourth focusing mirror 23.

In order to simultaneously control the insertion and removal of the first atom filter 16, the second atom filter 17, the third atom filter 18, and the fourth atom filter 19, the chopper wheel 31 and the first optical fiber 5, the second optical fiber 6, the third optical fiber 7, and the fourth optical fiber 8 are designed as shown in fig. 2. The chopping disk 31 is provided with a plurality of light-passing holes, each light-passing hole is symmetrical about the center axis of the chopping disk 31, in this embodiment, the light-passing holes are 4 fan-shaped holes with the center of the chopping disk 31 as the center of the circle, the emitting ends of the first optical fiber 5, the second optical fiber 6, the third optical fiber 7 and the fourth optical fiber 8 are arranged symmetrically about the center axis of the chopping disk 31, and the first optical fiber 5, the second optical fiber 6, the third optical fiber 7 and the fourth optical fiber 8 correspond to the four light-passing holes of the chopping disk 314 one by one. The emergent ends of the first optical fiber 5, the second optical fiber 6, the third optical fiber 7 and the fourth optical fiber 8 are arranged close to the arc of the fan-shaped light through hole on the chopping disk 314, and the emergent ends are tangent with the arc of the fan-shaped light through hole in the chopping disk 4

A multichannel atomic light filtering day and night automatic switching method comprises the following steps:

step one, turning on the computer 29, controlling the switching controller 28 to drive the motor 15 to rotate forward, and driving the sliding platform 32 to move to the head end of the stroke, that is, the sliding platform 32 slides towards the direction close to the first limit switch 13 until the first limit switch 13 is closed, the second limit switch 14 is not closed, and the first atomic filter 16, the second atomic filter 17, the third atomic filter 18 and the fourth atomic filter 19 reach the initial positions, at this time, the initialization is completed.

And step two, reading the ambient light illumination value fed back by the ambient photoelectric detector 30 in real time by using the computer 29, switching the state signals (closed and not closed) of the first limit switch 13 and the second limit switch 14 obtained by the controller 28, and feeding back the state signals to the computer 29.

Step three, the computer 29 selects the switching mode: and selecting an automatic switching mode by default, and jumping to the step four. If the manual switching mode is selected, the manual operation computer 29 controls the sliding platform 32 to move to the head end or the tail end of the stroke through the switching controller 28 and the motor 15, so as to realize the switching between the daytime working mode and the night working mode, and the step five is skipped.

Step four, judging the working mode: if the ambient illuminance value is less than or equal to the set illuminance threshold Q (if Q is 5lx), it is considered that the time is night, and then the night working mode is entered, that is:

the computer 29 controls the switching controller 28 to drive the motor 15 to rotate reversely, so as to drive the sliding platform 32 to move to the end of the stroke, and the sliding platform 32 slides towards the direction close to the second limit switch 14 until the second limit switch 14 is closed (the first limit switch 13 is not closed), at this time, the first atom filter 16 moves out of the light path between the first collimating mirror 9 and the first focusing mirror 20; the second atom filter 17 moves out of the optical path between the second collimator lens 10 and the second focusing lens 21; the third atomic filter 18 is moved out of the optical path between the third collimator lens 11 and the third focusing lens 22; the fourth atomic filter 19 moves out of the optical path between the fourth collimator lens 12 and the fourth focusing lens 23, the optical path between the first collimator lens 9 and the first focusing lens 20, the optical path between the second collimator lens 10 and the second focusing lens 21, the optical path between the third collimator lens 11 and the third focusing lens 22, and the optical path between the fourth collimator lens 12 and the fourth focusing lens 23 have no atomic filter, and the process goes to step five.

If the ambient light illumination value is greater than the set light illumination threshold value Q (if Q is 5lx), the day is considered to be a white day, and the daytime working mode is entered, that is:

the switching controller 28 is controlled to drive the motor 15 to rotate forward, so as to drive the sliding platform 32 to move to the head end of the stroke, the sliding platform 32 slides towards the direction close to the first limit switch 13 until the first limit switch 13 is closed (the second limit switch 14 is not closed), and at this time, the first atom filter 16 moves into the light path between the first collimating mirror 9 and the first focusing mirror 20; the second atom filter 17 is moved into the optical path between the second collimator lens 10 and the second focusing lens 21; the third atom filter 18 moves into the optical path between the third collimator lens 11 and the third focusing lens 22, and the fourth atom filter 19 moves into the optical path between the fourth collimator lens 12 and the fourth focusing lens 23, and the process goes to step five.

Step five, judging whether the first atomic filter 16, the second atomic filter 17, the third atomic filter 18 and the fourth atomic filter 19 are successfully inserted into the light path: if the signal of the first limit switch 13 is on, the second limit switch 14 is off, and the ambient light illuminance value of the ambient photodetector 30 is greater than the set illuminance threshold Q (if Q is 5lx), the first atomic filter 16, the second atomic filter 17, the third atomic filter 18, and the fourth atomic filter 19 are successfully inserted into the optical path, and the process goes to step two. If the signal of the first limit switch 13 is open, the signal of the second limit switch 14 is closed, and the ambient light illuminance value of the ambient photodetector 30 is less than or equal to the set illuminance threshold Q (if Q is 5lx), the first atom filter 16, the second atom filter 17, the third atom filter 18, and the fourth atom filter 19 are successfully moved out of the optical path, and the process skips to step two. If the situation is not the case, the computer 29 sends fault information to the staff for early warning in time, and the step two is skipped.

By the method, the working modes of the laser radar can be automatically switched at daytime and night.

The specific embodiments described herein are merely illustrative of the spirit of the invention. Various modifications or additions may be made to the described embodiments or alternatives may be employed by those skilled in the art without departing from the spirit or ambit of the invention as defined in the appended claims.