CN115326110B - Device and method for detecting resonant light path of cavity of laser gyroscope - Google Patents
Device and method for detecting resonant light path of cavity of laser gyroscope Download PDFInfo
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- G01J—MEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT, POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRARED, VISIBLE OR ULTRAVIOLET LIGHT; COLORIMETRY; RADIATION PYROMETRY
- G01J4/00—Measuring polarisation of light
Abstract
The invention relates to the technical field of laser gyroscopes, in particular to a device and a method for detecting a resonant light path of a cavity of a laser gyroscope. The base is provided with a static dynamic detection assembly used for switching between static detection and dynamic detection, the static dynamic detection assembly is provided with a fixed clamping assembly, the open end of the fixed clamping assembly is clamped with a shielding cover, a laser gyroscope is arranged in the shielding cover, the base is further provided with a beam combination modulation assembly, and a beam combination modulation channel is arranged on the beam combination modulation assembly. According to the invention, high-precision feedback control is introduced by utilizing polarization synthesis of the reference beam and the resonant beam, so that phase locking is realized, coherent superposition of the reference beam and the resonant beam is further realized, integrated output is realized by a JME method, the degree of emergent light modulation of the laser gyroscope is judged, and the problem that the laser gyroscope generating amplitude modulation needs to be completely disassembled and reassembled is avoided.
Description
Technical Field
The invention relates to the technical field of laser gyroscopes, in particular to a device and a method for detecting a resonant light path of a cavity of a laser gyroscope.
Background
The laser gyro is a device for measuring angular displacement of an object by utilizing optical path difference of laser beams, and basic elements forming the laser gyro are a helium-neon laser (or a semiconductor laser), a total reflector, a semi-transparent semi-reflector, a laser gyro light collector, a machine, an electricity meter and other advanced technologies, and the laser gyro widely covers a plurality of fields of land, sea, air and space, and is one of important marks for measuring the development level of the national optical technology.
In view of the fact that the detection of the output signal characteristic of the laser gyroscope is mainly performed on the finished laser gyroscope at present, the laser gyroscope generating amplitude modulation needs to be completely disassembled and reassembled. Therefore, if the characteristic detection of the laser gyro cavity resonant light path is started, the degree of the emergent light intensity modulation of the laser gyro can be detected and judged by a simple and easy resonant light path characteristic detection means before assembly is omitted, parts which do not meet requirements can be repaired in time, and the disassembly and reassembly of finished products can be reduced, so that the detection and production efficiency of the laser gyro can be obviously improved, the manufacturing period can be shortened, and the production cost can be reduced.
Based on the situation, from the characteristic detection of the laser gyroscope cavity resonant light path, the detection and judgment of the modulation degree of the emergent light intensity of the laser gyroscope before the assembly by the resonant light path characteristic detection means have great strategic and production significance.
Disclosure of Invention
The invention aims to provide a device for detecting a cavity resonant light path of a laser gyroscope, which is used for detecting and judging the emergent light modulation degree of the laser gyroscope by a resonant light path characteristic detection means before complete assembly from the characteristic detection of the cavity resonant light path of the laser gyroscope; the method is used for detecting the emergent light coupling polarization state of the laser gyroscope in static and dynamic environments of the laser gyroscope.
The invention is realized by the following technical scheme:
the utility model provides a detect laser gyroscope cavity resonance light path device, includes the base, be provided with the quiet dynamic detection subassembly that is used for static detection and dynamic detection to switch on the base, be provided with fixed centre gripping subassembly on the quiet dynamic detection subassembly, the open end centre gripping of fixed centre gripping subassembly has the shield cover, the inside of shield cover is provided with the laser gyroscope, still be provided with on the base and close and restraint the modulation subassembly, it restraints the modulation passageway to be provided with on the modulation subassembly to close to restraint, in closing the resonance cavity that the beam modulation subassembly in the light compensation driving source can produce reference beam and transmit to the laser gyroscope through closing the beam modulation passageway, the resonance light beam in reference beam and the resonance cavity takes place polarization synthesis after and produces and restraint laser, it judges the light modulated degree of laser gyroscope outgoing to close the beam modulation subassembly to integrate the output through the JME method. In the prior art, detection of the output signal characteristics of the laser gyroscope is mainly performed on a finished laser gyroscope, and for the laser gyroscope generating amplitude modulation, all the laser gyroscopes need to be disassembled and reassembled. It should be further noted that, due to the stress action on the optical cement bonding surface of the resonant cavity of the laser gyroscope, the incidence relation of the laser gyroscope cannot always maintain the brewster angle in the jittering state, and even in the static state, the production process treatment of the laser gyroscope can introduce internal stress into the laser gyroscope, so that the optical axis surface of the resonant cavity is not coplanar, and the precision of the laser gyroscope is further affected.
In view of the above circumstances, a device for detecting a resonant light path of a cavity of a laser gyroscope is provided, which specifically sets a static detection environment and a dynamic detection environment through a static and dynamic detection component capable of switching between static detection and dynamic detection, and introduces high-precision feedback control by utilizing polarization synthesis of a reference beam and a resonant beam, thereby realizing phase locking and further realizing coherent superposition of the reference beam and the resonant beam. The method realizes the integration output by the JME method and judges the light modulation degree of the laser gyro emergent light, and avoids the problem that the laser gyro generating amplitude modulation needs to be completely disassembled and reassembled.
Further, the beam combining modulation assembly comprises: the laser phase locking device comprises a polarization phase detector, a linear servo circuit, a voltage-controlled oscillator and a modulation unit, wherein the modulation unit is used for controlling the frequency shift quantity of a reference beam and a resonant cavity resonant beam, the voltage-controlled oscillator is in signal connection with the modulation unit and is used for precisely adjusting the frequency shift quantity, the polarization phase detector is in signal connection with the modulation unit and is used for detecting a polarization phase signal of a beam-combined laser, the polarization phase detector is in signal connection with the linear servo circuit, the linear servo circuit is used for receiving the polarization phase signal and forming a feedback execution signal after circuit amplification and filtering, the voltage-controlled oscillator is further in signal connection with the linear servo circuit and receives the feedback execution signal, the frequency shift quantity is precisely adjusted according to the feedback execution signal, and when the frequency shift quantity reaches laser phase locking, the polarization state is uniquely determined. Based on the components, a combined beam laser control assembly based on polarization state detection and beam combination coherent superposition states is established, and a corresponding physical model can be established by using the assembly, so that the unique polarization state is determined.
Further, quiet dynamic state detection subassembly includes motor and vibration part, the output of motor with vibration part is connected, fixed centre gripping subassembly includes: the vibration part comprises a plurality of clamping claws, a chassis, a supporting disk and a plurality of supporting pieces, wherein the output end of the vibration part is fixedly connected with the chassis, the supporting pieces are uniformly distributed on the upper end face of the chassis at intervals and fixedly connected with the lower end face of the supporting disk, and the plurality of clamping claws are arranged on the supporting disk in a sliding mode and abutted to the shielding cover. It should be noted that, for the static and dynamic detection component, since the laser gyro integrates the advanced technologies such as light collection, machinery, electricity, and computation, and widely covers a plurality of fields in the land, sea, air and space, it is necessary to research the detection process under static and dynamic conditions. Based on the steps, the switching of the laser gyroscope under dynamic and static conditions can be met, the clamping precision of the laser gyroscope can be effectively improved due to the high symmetry of the fixed clamping assembly, and the influence of accidental errors on detection results is avoided to the greatest extent.
Further, the fixed clamp assembly further comprises: cylinder, rotation piece and a plurality of slider, a plurality of slider interval equipartition is in on the supporting disk, the gripper jaw with the slider slides and sets up and the bottom runs through the slider, it includes to rotate the piece: carousel, a plurality of moving part and slider, the both ends of cylinder are connected with the slider of two symmetry settings, this slider with gripper jaw's bottom fixed connection, and the axis of this slider and cylinder is in the coplanar all the time, the carousel sets up the below at supporting disk middle part, and with the supporting disk rotates and sets up, the moving part interval equipartition articulates in the circumference of carousel, and the expansion end with gripper jaw's bottom is articulated. It should be further noted that, in order to increase the disorder of the dynamic conditions and better fit the use environment of the laser gyroscope, the sliding block is arranged on the supporting disk, and the bottom of the clamping claw penetrates through the sliding block to be connected with the moving part or the sliding part.
A method for detecting a resonant light path of a cavity of a laser gyroscope comprises the following steps: step 1, fixing a laser gyroscope, and mounting the laser gyroscope which is not completely assembled on a fixed clamping assembly; step 2, checking the occurrence of the light path, checking the occurrence of the resonant light beam in the resonant cavity after the installation of the step 1 is correct, and checking the occurrence of the reference light beam in the beam combining modulation channel; step 3, polarization synthesis, wherein after the step 2 is verified to be correct, a light compensation driving source in the beam combination modulation assembly is started to generate a reference beam, and the reference beam is emitted into the resonant cavity through the beam combination modulation channel to be subjected to polarization synthesis with the resonant beam to generate a combined laser; and 4, adjusting frequency shift amount, detecting a polarization phase signal of the combined laser through a polarization phase detector after the combined laser is generated in the step 3, transmitting the polarization phase signal to a linear servo circuit, amplifying and filtering the polarization phase signal through a circuit after the linear servo circuit receives the polarization phase signal to form a feedback execution signal, transmitting the feedback execution signal to a voltage-controlled oscillator, adjusting the frequency shift amount after the voltage-controlled oscillator receives the feedback execution signal until the frequency shift amount reaches laser phase locking, and enabling the polarization state to be unique. Based on the steps, the polarization state under the static environment can be effectively detected.
Further, still include: and (4) analyzing the modulation degree, integrating and outputting an actual value of the laser gyro emergent light modulation by the modulation unit through a JME (joint measurement and integration) method after the unique polarization state in the step (4) is obtained, introducing a theoretical value of the laser gyro emergent light modulation, and judging the degree of the laser gyro emergent light modulation by analyzing the actual value and the theoretical value. Because the output signal characteristic detection of the laser gyroscope is mainly performed on the finished laser gyroscope, the laser gyroscope generating amplitude modulation needs to be completely disassembled and reassembled. When the laser gyro which is not completely assembled needs to be detected, on the basis of the detected polarization state, the actual value of the emergent light modulation of the laser gyro can be integrated and output through a JME method, the theoretical value of the emergent light modulation of the laser gyro is introduced, and the degree of the emergent light modulation of the laser gyro is judged by analyzing the actual value and the theoretical value.
Further, the method for detecting the resonant light path of the cavity of the laser gyroscope further comprises the following steps: and (4) dynamic detection, starting the static and dynamic detection assembly, wherein the laser gyroscope is in a disordered shaking state at the moment, and repeating the steps 1 to 4 to obtain the emergent light polarization state of the laser gyroscope under the dynamic condition. Based on the steps, the detection of the polarization state can be completed in a dynamic environment.
Compared with the prior art, the invention has the following advantages and beneficial effects:
1. the static and dynamic detection environment and the dynamic detection environment are set through the static and dynamic detection assembly capable of switching static detection and dynamic detection, and high-precision feedback control is introduced by utilizing polarization synthesis of the reference light beam and the resonance light beam, so that phase locking is realized, coherent superposition of the reference light beam and the resonance light beam is further realized, integrated output is realized through a JME method, the degree of emergent light modulation of the laser gyroscope is judged, and the problem that the laser gyroscope generating amplitude modulation needs to be completely disassembled and reassembled is avoided;
2. the polarization phase detector detects the polarization phase signal of the beam-combined laser and transmits the polarization phase signal to the linear servo circuit, the linear servo circuit receives the polarization phase signal, the polarization phase signal is amplified and filtered by the circuit to form a feedback execution signal, the feedback execution signal is transmitted to the voltage-controlled oscillator, the voltage-controlled oscillator receives the feedback execution signal and then adjusts the frequency shift amount until the frequency shift amount reaches the laser phase locking, at the moment, the polarization state is unique, and the detection of the coupling polarization state of emergent light under the static and dynamic environments of the laser gyroscope is realized;
3. the fixed clamping assembly and the static and dynamic detection assembly can synchronously clamp and fix the laser gyro under static and dynamic conditions.
Drawings
The accompanying drawings, which are included to provide a further understanding of the embodiments of the invention and are incorporated in and constitute a part of this application, illustrate embodiment(s) of the invention and together with the description serve to explain the principles of the invention. In the drawings:
FIG. 1 is a schematic view of the structure of the present invention;
FIG. 2 is a schematic diagram of the connection of the beam combining modulation assembly;
FIG. 3 is a schematic view of a stationary clamping assembly;
fig. 4 is a schematic diagram of polarization synthesis.
Reference numbers and corresponding part names in the drawings:
1-laser gyroscope, 2-base, 3-static and dynamic detection component, 31-motor, 32-vibration component, 4-fixed clamping component, 41-clamping claw, 42-base plate, 43-supporting plate, 44-supporting component, 45-air cylinder, 46-rotating component, 461-rotating disk, 462-moving component, 463-sliding component, 47-sliding block, 5-shielding cover, 6-beam combination modulation component and 7-beam combination modulation channel.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described in detail below with reference to examples and accompanying drawings, and the exemplary embodiments and descriptions thereof are only used for explaining the present invention and are not meant to limit the present invention. It should be noted that the present invention is in practical development and use.
Example 1:
as shown in fig. 1 to 2, a device for detecting a resonant light path of a cavity of a laser gyroscope includes a base 2, a static and dynamic detection component 3 for switching between static detection and dynamic detection is arranged on the base 2, a fixed clamping component 4 is arranged on the static and dynamic detection component 3, a shielding cover 5 is clamped at an opening end of the fixed clamping component 4, a laser gyroscope 1 is arranged inside the shielding cover 5, a beam combining modulation component 6 is further arranged on the base 2, a beam combining modulation channel 7 is arranged on the beam combining modulation component 6, a light compensation driving source in the beam combining modulation component 6 can generate a reference light beam and transmit the reference light beam to a resonant cavity of the laser gyroscope 1 through the beam combining modulation channel 7, the reference light beam and the resonant light beam in the resonant cavity are subjected to polarization synthesis to generate a combined beam laser, and the beam combining modulation component 6 integrates and outputs through a JME method to judge the degree of light modulation of the laser gyroscope 1.
In the prior art, the detection of the output signal characteristics of the laser gyroscope 1 is mainly performed on the finished laser gyroscope 1, and all the laser gyroscopes 1 which generate amplitude modulation need to be disassembled and reassembled. It should be further noted that, a stress action exists on the optical cement bonding surface of the resonant cavity of the laser gyroscope 1, so that the incidence relation of the laser gyroscope 1 cannot always maintain the brewster angle in a jittering state, even under a static state, the production process treatment of the laser gyroscope 1 can introduce internal stress into the laser gyroscope 1, so that the optical axis surfaces of the resonant cavity are not coplanar, and the precision and the like of the laser gyroscope 1 are further influenced. The fixed clamping assembly 4 can be a chuck, but the prior art chuck has the problem of low synchronous control precision. The static detection environment can be regarded as an ideal static state, even if the static detection environment cannot be regarded as the ideal static state, the influence of environmental factors can be reduced by applying reverse compensation to the laser gyro 1 through the static dynamic detection component 3. For the dynamic detection environment, up-and-down dithering may be used, or left-and-right rotation may be used, and disorder dithering with the preferable effect is used. As for the shield case 5, it is preferable that the electromagnetic shield case 5 can also effectively reduce the influence factors other than the photoelectricity. The beam combining modulation channel 7 is preferably a prism tunnel to support the reference beam passage. The JME method is preferably a Jones matrix characteristic analysis method.
In view of the above, a device for detecting a resonant light path of a cavity of a laser gyroscope is provided, specifically, a static detection environment and a dynamic detection environment are set by a static and dynamic detection component 3 capable of switching between static detection and dynamic detection, and high-precision feedback control is introduced by polarization synthesis of a reference beam and a resonant beam, so that phase locking is realized, and coherent superposition of the reference beam and the resonant beam is further realized. The method realizes the integration output by the JME method and judges the light modulation degree of the laser gyro 1, and avoids the problem that the laser gyro 1 generating amplitude modulation needs to be completely disassembled and reassembled.
It should be noted that the beam combining and modulating assembly 6 includes: the laser phase locking device comprises a polarization phase detector, a linear servo circuit, a voltage-controlled oscillator and a modulation unit, wherein the modulation unit is used for controlling the frequency shift quantity of a reference beam and a resonant cavity resonant beam, the voltage-controlled oscillator is in signal connection with the modulation unit and is used for precisely adjusting the frequency shift quantity, the polarization phase detector is in signal connection with the modulation unit and is used for detecting a polarization phase signal of a beam-combined laser, the polarization phase detector is in signal connection with the linear servo circuit, the linear servo circuit is used for receiving the polarization phase signal and forming a feedback execution signal after circuit amplification and filtering, the voltage-controlled oscillator is further in signal connection with the linear servo circuit and receives the feedback execution signal, the frequency shift quantity is precisely adjusted according to the feedback execution signal, and when the frequency shift quantity reaches laser phase locking, the polarization state is uniquely determined. Based on the components, a beam combination laser control assembly based on polarization state detection and a beam combination coherent superposition state is established, and a corresponding physical model can be established by using the assembly, so that the unique polarization state is determined. For the linear servo circuit, a PID circuit may be used. For the amount of frequency shift, it is less than 150MHz. For the modulation unit, it may be a modulator connected to a processor, and the polarization phase detector may be a photodetector.
It should be noted that the static and dynamic detection assembly 3 includes a motor 31 and a vibration component 32, an output end of the motor 31 is connected to the vibration component 32, and the fixed clamping assembly 4 includes: the vibration part comprises a plurality of clamping claws 41, a chassis 42, a supporting plate 43 and a plurality of supporting pieces 44, wherein the output end of the vibration part 32 is fixedly connected with the chassis 42, the supporting pieces 44 are uniformly distributed on the upper end face of the chassis 42 at intervals and fixedly connected with the lower end face of the supporting plate 43, and the plurality of clamping claws 41 are arranged on the supporting plate 43 in a sliding mode and are abutted to the shielding cover 5. It should be noted that, for the static and dynamic detection component 3, since the laser gyro 1 integrates the advanced technologies such as light collection, mechanical, electrical, calculation, etc., and widely covers a plurality of fields in land, sea, air and space, it is necessary to research the detection process under static and dynamic conditions. Based on the steps, the switching of the laser gyroscope 1 under dynamic and static conditions can be met, the clamping precision of the laser gyroscope 1 can be effectively improved due to the high symmetry of the fixed clamping assembly 4, and the influence of accidental errors on detection results is avoided to the greatest extent.
A method for detecting a resonant light path of a cavity of a laser gyroscope comprises the following steps: step 1, fixing a laser gyroscope 1, and installing the laser gyroscope 1 which is not completely assembled on a fixed clamping component 4; step 2, checking the occurrence of the light path, checking the occurrence of the resonant beam in the resonant cavity after the installation of the step 1 is correct, and checking the occurrence of the reference beam in the beam combining modulation channel 7; step 3, polarization synthesis, namely after the error is verified in the step 2, starting a light compensation driving source in the beam combination modulation assembly 6 to generate a reference beam, and transmitting the reference beam into the resonant cavity through a beam combination modulation channel 7 to be subjected to polarization synthesis with the resonant beam to generate a combined beam laser; and 4, adjusting frequency shift amount, detecting a polarization phase signal of the combined laser through a polarization phase detector after the combined laser is generated in the step 3, transmitting the polarization phase signal to a linear servo circuit, amplifying and filtering the polarization phase signal through a circuit after the linear servo circuit receives the polarization phase signal to form a feedback execution signal, transmitting the feedback execution signal to a voltage-controlled oscillator, adjusting the frequency shift amount after the voltage-controlled oscillator receives the feedback execution signal until the frequency shift amount reaches laser phase locking, and enabling the polarization state to be unique. Based on the steps, the polarization state under the static environment can be effectively detected.
It should be noted that the method further includes: and (4) analyzing the modulation degree, integrating and outputting an actual value of the emergent light modulation of the laser gyro 1 by the modulation unit through a JME (joint management entity) method after the unique polarization state in the step (4) is obtained, introducing a theoretical value of the emergent light modulation of the laser gyro 1, and judging the emergent light modulation degree of the laser gyro 1 by analyzing the actual value and the theoretical value. Because the detection of the output signal characteristic of the laser gyroscope 1 is mainly performed for the finished laser gyroscope 1, the laser gyroscope 1 generating amplitude modulation needs to be completely disassembled and reassembled. When the laser gyro 1 which is not completely assembled needs to be detected, on the basis of the measured polarization state, the actual value of the emergent light modulation of the laser gyro 1 can be integrated and output by a JME method, the theoretical value of the emergent light modulation of the laser gyro 1 is introduced, and the degree of the emergent light modulation of the laser gyro 1 is judged by analyzing the actual value and the theoretical value.
It should be noted that the method for detecting the cavity resonance optical path of the laser gyroscope 1 further includes: and (4) dynamic detection, namely starting the static and dynamic detection assembly 3, wherein the laser gyroscope 1 is in a disordered shaking state at the moment, and repeating the steps 1 to 4 to obtain the emergent light polarization state of the laser gyroscope 1 under the dynamic condition. Based on the steps, the detection of the polarization state can be completed in a dynamic environment.
Example 2:
this example describes only the portions different from example 1, specifically: it should be noted that, as shown in fig. 3, the fixed clamping assembly 4 further includes: cylinder 45, rotate 46 and a plurality of slider 47, a plurality of slider 47 interval equipartition is in on the supporting disk 43, gripper jaw 41 with slider 47 slides and sets up and the bottom is run through slider 47, it includes to rotate 46: the clamping device comprises a rotary disc 461, a plurality of moving parts 462 and a sliding part 463, wherein two ends of the air cylinder 45 are connected with two sliding parts 463 which are symmetrically arranged, the sliding part 463 is fixedly connected with the bottom of the clamping claw 41, the axes of the sliding part 463 and the air cylinder 45 are always in the same plane, the rotary disc 461 is arranged below the middle part of the supporting disc 43 and is rotatably arranged with the supporting disc 43, the moving parts 462 are uniformly distributed and hinged on the circumferential direction of the rotary disc 461, and the moving ends are hinged with the bottom of the clamping claw 41. It should be noted that, in order to increase the disorder of the dynamic conditions and to better conform to the usage environment of the laser gyroscope 1, the sliding block 47 is disposed on the supporting plate 43, and the bottom of the clamping claw 41 penetrates through the sliding block 47 to be connected to the movable element 462 or the sliding element 463, when the air cylinder 45 is started to contract, the sliding elements 463 at both ends of the air cylinder 45 are driven to move toward the axis of the supporting plate 43, and since the rotating disc 461 is rotatably disposed below the supporting plate 43 and is circumferentially connected to the movable element 462, the clamping claw 41 is finally driven to synchronously move toward the axis of the supporting plate 43, thereby achieving the clamping function.
Example 3:
preferably, a principle related to polarization synthesis is explained here, as shown in fig. 4, the reference beam and the resonant beam are subjected to primary amplification, frequency shift by the modulator and secondary amplification, the polarization state is modulated by the half wave plate, then the polarization splitting prism is used for laser beam combination output, and then the angle of the half wave plate is finely adjusted, so that the laser with smaller power is separated for laser polarization phase control, and most of the laser after combination can keep linear polarization state output after polarization adjustment of the polarization device.
The light compensation driving source is single-frequency narrow linewidth laser with 1064nm, the output power is about 40mW, the linewidth is less than 100KHz,
the above-mentioned embodiments are intended to illustrate the objects, technical solutions and advantages of the present invention in further detail, and it should be understood that the above-mentioned embodiments are merely exemplary embodiments of the present invention, and are not intended to limit the scope of the present invention, and any modifications, equivalent substitutions, improvements and the like made within the spirit and principle of the present invention should be included in the scope of the present invention.
Claims (6)
1. The utility model provides a detect laser gyroscope cavity resonance light path device, includes base (2), its characterized in that: the device comprises a base (2), wherein a static and dynamic detection assembly (3) used for static detection and dynamic detection switching is arranged on the base (2), a fixed clamping assembly (4) is arranged on the static and dynamic detection assembly (3), a shielding cover (5) is clamped at the opening end of the fixed clamping assembly (4), a laser gyroscope (1) is arranged inside the shielding cover (5), a beam combining modulation assembly (6) is further arranged on the base (2), a beam combining modulation channel (7) is arranged on the beam combining modulation assembly (6), a light compensation driving source in the beam combining modulation assembly (6) can generate a reference beam and transmit the reference beam to a resonant cavity of the laser gyroscope (1) through the beam combining modulation channel (7), a beam combining laser is generated after the reference beam and the resonant beam in the resonant cavity are subjected to polarization synthesis, and the beam combining modulation assembly (6) is used for integrating and outputting to judge the light modulation degree of the emergent light of the laser gyroscope (1) through a JME method;
the beam combining modulation assembly (6) comprises: the laser phase locking device comprises a polarization phase detector, a linear servo circuit, a voltage-controlled oscillator and a modulation unit, wherein the modulation unit is used for controlling the frequency shift quantity of a reference beam and a resonant beam in a resonant cavity, the voltage-controlled oscillator is in signal connection with the modulation unit and is used for precisely adjusting the frequency shift quantity, the polarization phase detector is in signal connection with the modulation unit and is used for detecting a polarization phase signal of laser combined beams, the polarization phase detector is in signal connection with the linear servo circuit, the linear servo circuit is used for receiving the polarization phase signal and forming a feedback execution signal after circuit amplification and filtering, the voltage-controlled oscillator is further in signal connection with the linear servo circuit and receives the feedback execution signal, the frequency shift quantity is precisely adjusted according to the feedback execution signal, and when the frequency shift quantity reaches laser phase locking, the polarization state is uniquely determined.
2. The device for detecting the cavity resonance light path of the laser gyroscope as claimed in claim 1, wherein: quiet dynamic testing subassembly (3) include motor (31) and vibration part (32), the output of motor (31) with vibration part (32) are connected, fixed centre gripping subassembly (4) include: the vibration device comprises a plurality of clamping jaws (41), a chassis (42), a supporting disc (43) and a plurality of supporting pieces (44), wherein the output end of the vibration part (32) is fixedly connected with the chassis (42), the supporting pieces (44) are uniformly distributed on the upper end face of the chassis (42) at intervals and fixedly connected with the lower end face of the supporting disc (43), and the clamping jaws (41) are slidably arranged on the supporting disc (43) and abutted to the shielding cover (5).
3. The device for detecting the cavity resonance light path of the laser gyroscope as claimed in claim 2, wherein: the fixed clamping assembly (4) further comprises: cylinder (45), rotation piece (46) and a plurality of slider (47), a plurality of slider (47) interval equipartition is in on supporting disk (43), gripper jaw (41) with slider (47) slide to set up and the bottom runs through slider (47), it includes to rotate piece (46): the clamping device comprises a rotary disc (461), a plurality of movable pieces (462) and sliding pieces (463), wherein two ends of a cylinder (45) are connected with the two sliding pieces (463) which are symmetrically arranged, the sliding pieces (463) are fixedly connected with the bottom of a clamping claw (41), the axes of the sliding pieces (463) and the cylinder (45) are always in the same plane, the rotary disc (461) is arranged below the middle part of a supporting disc (43) and is rotatably arranged with the supporting disc (43), the movable pieces (462) are uniformly hinged on the circumferential direction of the rotary disc (461) at intervals, and the movable ends are hinged with the bottom of the clamping claw (41).
4. A method for detecting a resonant light path of a cavity of a laser gyroscope is characterized by comprising the following steps: the device for detecting the cavity resonance light path of the laser gyroscope as claimed in any one of claims 1 to 3, comprising the following steps:
step 1, fixing a laser gyroscope (1), and installing the laser gyroscope (1) which is not completely assembled on a fixed clamping component (4);
step 2, optical path occurrence verification, namely verifying the occurrence of the resonant beam in the resonant cavity after the installation of the step 1 is correct, and verifying the occurrence of the reference beam in the beam combination modulation channel (7);
step 3, polarization synthesis, wherein after the step 2 is verified to be correct, a light compensation driving source in the beam combination modulation assembly (6) is started to generate a reference beam, and the reference beam is emitted into the resonant cavity through the beam combination modulation channel (7) to be subjected to polarization synthesis with the resonant beam to generate a combined beam laser;
and 4, adjusting frequency shift quantity, detecting a polarization phase signal of the combined laser through a polarization phase detector after the combined laser is generated in the step 3, transmitting the polarization phase signal to a linear servo circuit, amplifying and filtering the polarization phase signal through a circuit after the linear servo circuit receives the polarization phase signal to form a feedback execution signal, transmitting the feedback execution signal to a voltage-controlled oscillator, adjusting the frequency shift quantity after the voltage-controlled oscillator receives the feedback execution signal until the frequency shift quantity reaches laser phase locking, and enabling the polarization state to be unique.
5. The method for detecting the cavity resonance light path of the laser gyroscope according to claim 4, characterized in that: further comprising: and (4) analyzing the modulation degree, integrating and outputting an actual value of the emergent light modulation of the laser gyroscope (1) by the modulation unit through a JME method after the unique polarization state in the step (4) is obtained, introducing a theoretical value of the emergent light modulation of the laser gyroscope (1), and judging the emergent light modulation degree of the laser gyroscope (1) by analyzing the actual value and the theoretical value.
6. The method for detecting the cavity resonant light path of the laser gyroscope according to claim 4, wherein the method comprises the following steps: the method for detecting the resonant light path of the cavity of the laser gyroscope further comprises the following steps: and (3) dynamic detection, namely starting the static and dynamic detection assembly (3), wherein the laser gyroscope (1) is in a disordered shaking state, and repeating the steps 1 to 4 to obtain the emergent light polarization state of the laser gyroscope (1) under the dynamic condition.
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