CN104075703B - Resonant optical gyroscope based on high-K fluoride resonant cavity - Google Patents

Abstract

The invention discloses a resonant optical gyroscope based on a high-K fluoride resonant cavity. The resonant optical gyroscope comprises a laser, a beam splitter, phase modulators, ring-shaped resonators, a triangular prism, a fluoride wedge-shaped cavity, detectors, lock-in amplifiers, a PI circuit, an adder, a high-voltage amplifier, signal generators and an isolator; the PI circuit is used for modulating optical signals to enable physical quantities extracted from signals output from the detector A and B to be capable of reacting the rotation angle of a carrier, and the frequency of the emergent light of a light source and a modulating voltage of the phase modulators can be respectively changed according to the physical quantities, the feedback of an optical path can be realized, and the purpose that the optical paths propagating in the fluoride wedge-shaped cavity clockwise and anti-clockwise are resonant can be realized.

Description

based on high K Resonant Optical Gyroscope Based on Fluoride Resonant Cavity

technical field

The invention belongs to the technical field of gyroscopes, and relates to an angular rate measuring device, specifically a method of light transmission in a closed optical path based on the Sagnac effect, which uses a fluoride wedge-shaped cavity and is realized by multi-beam interference A resonant optical gyroscope for measuring angular velocity, specifically a resonant optical gyroscope based on a high-K fluoride resonant cavity.

Background technique

As the core component of the inertial navigation system, the gyro-inertial device is used in land, sea, air and space guidance, navigation and control technology fields such as land, sea, air and space guidance, navigation and control technology, as well as satellite attitude Control, camera stabilization, image stabilization, geodetic surveying, resource surveying, robotics, consumer electronics and other industries have a wide range of application backgrounds, and their development is of great significance to the development of a country's national defense, basic industries, and high-tech industries.

At present, gyro inertial devices mainly include traditional mechanical gyroscopes, optical gyroscopes (fiber optic gyroscopes, laser gyroscopes), and micromechanical (MEMS) gyroscopes. Traditional mechanical gyroscopes are suitable for high-precision inertial navigation of large carriers, but they generally have problems such as large size, long start-up time, and movable parts, which cannot meet the requirements of device performance in applications such as deep space exploration and construction of deep space detection networks. Requirements such as stability, low power consumption, and small size, as well as the requirements for miniaturization and stealth weapons and equipment for combat use, make it difficult to realize a "handy" measurement system. Micro-mechanical gyroscopes have received widespread attention in recent years and have developed very rapidly. The performance, accuracy and reliability of micro-gyroscopes have gradually improved, but fundamental breakthroughs have not yet been made, and they have not been widely used in the market like micro-accelerometers. With the miniaturization of the micromechanical inertial device, its mass and momentum also decrease sharply, and the improvement of its sensitivity and resolution has reached the detection limit state. Optical gyroscopes have the advantages of compact structure, high sensitivity, and reliable operation, and have become an indispensable key part of modern navigation instruments. However, fiber optic gyroscopes require more complex photoelectric signal processing, are costly, are greatly affected by changes in environmental conditions such as temperature, and are not easy to integrate.

With the wide application of global satellite positioning system and the rapid development of high technology, the modern inertial navigation system has changed its development direction and put forward higher requirements for inertial devices. Inertial devices must have the characteristics of small size, light weight, low power consumption, high reliability, and easy integration while ensuring high precision. Therefore, a resonant optical gyroscope with high precision, high sensitivity and high reliability has become an important development direction.

Gyroscopes are devices used to measure changes in angular rate and angular acceleration. The main principle of the gyroscope is the Sagnac effect. In the inertial space, the Sagnac effect can be described as: the test of the rotational angular velocity of the resonator is achieved by detecting the frequency difference between the clockwise and counterclockwise beam output in the resonator. When the resonator is stationary, the frequency of the two beams of light waves is the same, and the frequency difference is zero; when the resonator rotates, the frequency of the two beams of light propagating in opposite directions changes, and the frequency difference of the two beams of light is linearly related to the rotational speed, its expression The formula is: Δf=4AΩ/λL= DΩ/λ (A is the area of the resonant cavity, D is the diameter of the resonant cavity, L is the circumference of the resonant cavity, and 4A/λL is the scaling factor of the gyroscope), so Δf is measured , you can know the value of the rotation angular rate Ω.

Resonant optical gyroscope is a new type of angular velocity sensor. Compared with mechanical gyroscope, it has the advantages of all solid state, insensitivity to neutral, and fast startup; compared with ring laser gyroscope, it has the characteristics of no high-voltage power supply and no mechanical jitter. , In addition, it also has the characteristics of light weight, small size, high sensitivity, low cost, high reliability, low power consumption, etc. Compared with the interferometric fiber optic gyroscope, it can reduce the temperature effect and Shupe error caused by multi-turn coil winding , using a highly coherent light source with high wavelength stability, high detection accuracy, and large dynamic range.

The single-frequency laser with very narrow resonance propagates in the resonant fiber optic gyroscope, which will change the refractive index of the fiber core, thereby causing the Kerr effect. The mismatch of the light intensity of the clockwise and anticlockwise two beams of light can also cause a frequency error, thus impressing the accuracy of the true gyro signal detection frequency difference. When the fineness of the resonant cavity is very high and the light intensity is very strong, it will cause mobile phone radiation in the quartz fiber, resulting in Brillouin scattering, and this stimulated radiation will make the measurement of the resonant frequency extremely unstable. In the fiber resonator, the property that the polarization state does not change after one cycle is called the intrinsic state of polarization. Usually, changes in temperature in the environment or changes in external vibrations will cause a relative change in the peak position of the resonance peak corresponding to the polarization eigenstate, thereby causing a frequency difference caused by polarization fluctuations, which will directly affect the gyro rotation. Measurement of angular velocity.

In the traditional resonant cavity selection, most of the resonant cavity materials use silicon dioxide, because SiO ₂ has good insulating properties and stable silicon dioxide-silicon substrate interface, but due to the Q value of the resonant cavity made of silicon dioxide Low, and the size can only be on the order of tens of um, which cannot meet the requirements of gyro navigation.

Contents of the invention

The object of the present invention is to provide a resonant optical gyroscope based on a high-K fluoride resonant cavity in order to solve the above-mentioned problems in the prior art.

The present invention is achieved through the following technical solutions:

A resonant optical gyro based on a high-K fluoride resonator cavity, including a laser integrated on a silicon substrate, a beam splitter, an A phase modulator, a B phase modulator, an A ring resonator, a B ring resonator, and a triangular prism , Fluoride wedge cavity, A detector, A lock-in amplifier, PI circuit (that is, gain integration circuit), adder, high voltage amplifier, C signal generator, A signal generator, B detector, B signal generator, B Lock-in amplifier and isolator; A signal generator, B signal generator, and C signal generator have the same structure; A phase modulator and B phase modulator have the same structure, but the modulation frequency set in the modulation process is different; A detection The detector and B detector have the same structure; the fluoride wedge-shaped cavity refers to a disc made of fluoride crystals with a precision of 0.9999 or more, and the periphery is wedge-shaped;

Among them, the A phase modulator and the B phase modulator are arranged up and down in the center of the silicon substrate, and the A and B phase modulators are arranged on the right side of the A and B phase modulators, and the A ring resonator and the B ring resonator are arranged up and down; Lasers, isolators and beam splitters are arranged in sequence from left to right, triangular prisms and fluoride wedge cavities are arranged in sequence on the right side of ring resonators A and B from left to right; B signal generator is arranged above A phase modulator, B The B lock-in amplifier is arranged above the signal generator; the A signal generator is arranged under the B phase modulator, and the A lock-in amplifier is arranged under the A signal generator; the high-voltage amplifier is arranged under the isolator, and the adder is arranged under the high-voltage amplifier. The PI circuit is arranged; the C signal generator is arranged under the beam splitter; the B detector is arranged above the A ring resonator, and the A detector is arranged under the B ring resonator;

The laser is connected to the isolator, the isolator is connected to the beam splitter, the beam splitter is connected to the A phase modulator and the B phase modulator respectively, the A phase modulator is connected to the A ring resonator, and the B phase modulator is connected to the B ring resonator connected, the light output end of the A ring resonator is vertically aligned with one side of the triangular prism through the collimator, the light output end of the B ring resonator is vertically aligned with the other side of the triangular prism through the collimator, and the bottom surface of the triangular prism is aligned with the The fluoride wedge-shaped cavity is coupled through the evanescent field (when the gap between the triangular prism and the fluoride wedge-shaped cavity is less than 4 times the resonant wavelength, the light that was originally only totally reflected at the interface between the prism and the air, also partly in the form of evanescent waves Enter the fluoride wedge-shaped cavity, that is, the light wave entering the fluoride cavity will be transmitted and coupled in the cavity); the laser is connected to the high-voltage amplifier, the high-voltage amplifier is connected to the adder, the adder is connected to the C signal generator through the switch, and the adder Also connected with PI circuit, PI circuit is connected with A lock-in amplifier, A lock-in amplifier is respectively connected with A signal generator and A detector, A signal generator is connected with A phase modulator, A detector is connected with B ring resonator Connection; the B lock-in amplifier is respectively connected with the B signal generator and the B detector, the B signal generator is connected with the B phase modulator, and the B detector is connected with the A ring resonator.

Further, the laser is a stable single-frequency solid-state laser with a polarization-maintaining fiber and a narrow spectral line. The use of a stable single-frequency solid-state laser with a polarization-maintaining fiber and a narrow spectral line is to ensure stable operating wavelength and temperature stability. And very good unidirectional output; A phase modulator and B phase modulator are both low-amplitude modulation phase modulators, because the signal generator can only output a maximum voltage of 10V, and the low-amplitude phase modulator can avoid the high temperature The change of the modulator modulation coefficient and the change of the phase response characteristics caused by the modulator lead to unstable performance; the PI circuit is a control circuit with good feedback, and only the PI circuit can correct the deviation and adjust the error well, and feed back the frequency of the resonant cavity to the high voltage Amplifiers and lasers can quickly lock the frequency of the resonant cavity; the triangular prism is an isosceles right-angle triangular prism, and the choice of an isosceles right-angle prism is to ensure the symmetrical transmission and strict total reflection transmission of light in the prism.

The wedge angle θ of the fluoride wedge cavity is 20°, if the wedge angle reaches 20°, the Q value is higher, that is, the ability of the resonator to localize light is stronger.

When working, as shown in Figures 1 and 3, the light source is emitted from the laser and is isolated by the isolator ISO. The isolator ISO is used to prevent the reflected light from the laser from affecting its original output frequency. The light output by the isolator passes The beam splitter splits the beam into beam 1 and beam 2. At this time, the beam splitter splits the light intensity rather than the frequency. The beam 1 enters and exits the A phase modulator and then enters the A ring resonator, and the beam 2 enters and exits the B phase modulator and then enters and exits. B ring resonator, the main function of A and B ring resonators is to indicate the direction; the modulated light emitted from the A ring resonator enters the triangular prism vertically from the 201 side of the triangular prism, and is completely refracted on the bottom surface of the triangular prism 203. reflection, and then output from the 202 side of the triangular prism; the modulated light emitted from the B ring resonator enters the triangular prism vertically from the 202 side of the triangular prism, and is totally reflected at the bottom of the triangular prism 203 after refraction, and then from the 201 side of the triangular prism Side output (as shown in Figure 3, set the side of the triangular prism corresponding to the ring resonator A as side 201, the side corresponding to the ring resonator B as side 202, and the bottom as the bottom of 203). An evanescent field is generated between the bottom surface of the triangular prism 203 and the interval between the fluoride wedge-shaped cavity so that two beams of light waves are coupled into the triangular prism, wherein the light entering through the side of 201 of the triangular prism forms a counterclockwise CCW beam in the fluoride wedge-shaped cavity, and passes through The light entering the fluoride wedge-shaped cavity from the side of the triangular prism 202 forms a clockwise CW beam in the fluoride wedge-shaped cavity, and the counterclockwise beam CCW entering the fluoride wedge-shaped cavity circulates out and enters the B ring resonator, and is detected by the A detector. Then through the A lock-in amplifier, enter the PI circuit, adder and high-voltage amplifier, and finally pass it to the laser. Here, the PI circuit is used to correct the deviation and adjust the error, so that the PZT of the laser locks the frequency of the fluoride wedge cavity (inverse The beam of the hour hand), the adder and the switch function are to open the switch when the frequency is locked, the scanning voltage and the PI control voltage are added and then transmitted to the PZT of the laser to control the frequency. The clockwise beam CW that enters the fluoride wedge cavity through the B ring resonator circulates out into the A ring resonator, is detected by the B detector, and then output through the B lock-in amplifier. The output signal at this time is the frequency difference of the gyroscope signal, thus realizing a single-channel closed-loop control system.

The invention adopts the fluoride material with high dielectric constant (high K) to replace the silicon dioxide material to prepare the wedge-shaped cavity, thereby obtaining a high-Q, high-precision resonant optical gyroscope. The invention is a resonant optical gyroscope with higher precision and higher sensitivity. The resonant cavity made of fluoride such as lithium fluoride, magnesium fluoride, calcium fluoride, barium fluoride and other high-K fluorides has the advantages of high Q value and large diameter d, and can obtain high-precision transmission spectrum output , so as to achieve higher resolution angular velocity measurement, and improve the measurement accuracy of the existing MEMS inertial sensor by more than two orders of magnitude, reaching 0.1-0.01 ^o /h, which can meet the requirements of navigation level. Using an isosceles right-angle triangular prism as a coupler can ensure the symmetrical input and output of the optical path, thereby reducing the above-mentioned polarization error; using the coupling method between the triangular prism and the wedge-shaped cavity, after fixing the relative positions of the prism and the wedge-shaped cavity, the packaging Compared with fiber-optic coupling, it is easier to package with UV-curable adhesive and has better performance.

In the resonant optical gyro based on the fluoride resonant cavity of the present invention, the PI circuit modulates the optical signal so that the physical quantity that can reflect the angular rate of the carrier rotation is extracted from the output signal of the photodetector (A detector, B detector) , and according to the physical quantity, respectively change the frequency of the outgoing light of the control light source and the modulation voltage of the phase modulator to realize the feedback of the optical path, and finally achieve the purpose of resonating the optical paths propagating clockwise and counterclockwise in the fluoride wedge cavity. In the present invention, by detecting the frequency difference of light propagating clockwise and counterclockwise in the resonant cavity (consisting of a triangular prism and a fluoride wedge cavity), and through the frequency-speed conversion relationship △f=DΩ/λ, the angular rate of rotation of the carrier is indirectly measured . Figure 5 is a schematic diagram of the Sagnac effect, that is, when the gyro is not rotating, the two beams of clockwise and counterclockwise light emitted from the exit point P pass to point P at the same time after passing through the same optical path difference. When the gyro is at an angular velocity of Ω When rotating, when the clockwise and counterclockwise light beams travel in opposite directions and return to the exit point, point P has moved to point P'. Therefore, the frequency difference of the gyro rotation can be calculated according to the frequency difference between the two light beams clockwise and counterclockwise. angular velocity.

The beneficial effects of the present invention are:

1) The fluoride material that constitutes the resonant cavity has a wide transmission band and high transparency, and its structure is simple and does not deliquesce. It is a material with excellent optical properties;

2) The size and diameter of the resonant cavity (fluoride wedge cavity) can reach mm level, so the Q value of the resonant cavity made of fluoride material can reach 10 ⁸ -10 ¹¹ , and the fineness can reach 10 ⁵ , which is the high sensitivity of the gyro It provides a guarantee for high precision and high precision, and makes it possible for the performance index of the resonant gyroscope to reach the inertial navigation level and precision level;

3) The isosceles right-angle triangular prism has the characteristics of plane total internal reflection, angular mode selection and phase conjugation effect, so that the light field distribution tends to be uniform during the oscillation process, the far-field divergence angle of the output light is small, and the low-cost mode output, Good beam quality;

4) The optical coupling in the wedge resonator adopts prism coupling. Prism coupling is coupled through spatial light. After adjusting the coupling angle, it can be directly packaged. Unlike optical fiber coupling, UV curing is required for packaging. The glue is fixed, and the thermal effect of the UV-cured glue is poor, and the temperature rise or fall will affect the refractive index, resulting in changes in the final output transmission spectrum and the transmission spectrum before packaging. On the basis of improving the coupling efficiency, the loss of the coupler and the additional loss and packaging problems such as light scattering caused by the mismatch of the mode field diameter of the fiber optic gyroscope are avoided.

Description of drawings

Fig. 1 is a structural schematic diagram of the present invention.

Fig. 2 is a schematic structural diagram of a fluoride wedge cavity in the present invention.

FIG. 3 is a partial section structure diagram of FIG. 2 .

Fig. 4 is a schematic diagram of the coupling between a triangular prism and a fluoride wedge cavity in the present invention.

Figure 5 is a schematic diagram of the Sagnac effect.

In the figure: 1-laser, 2-beam splitter, 3-A phase modulator, 4-B phase modulator, 5-A ring resonator, 6-B ring resonator, 7-triangular prism, 8-fluoride Wedge cavity, 9-A detector, 10-A lock-in amplifier, 11-PI circuit, 12-adder, 13-high voltage amplifier, 14-C signal generator, 15-A signal generator, 16-B detector , 17- B signal generator, 18- C signal generator, 19- isolator, 20- switch.

detailed description

The present invention will be further described below in conjunction with accompanying drawing:

As shown in Figures 1 to 5, a resonant optical gyro based on a high-K fluoride resonator cavity includes a laser 1, a beam splitter 2, an A phase modulator 3, and a B phase modulator 4 integrated on a silicon substrate , A ring resonator 5, B ring resonator 6, triangular prism 7, fluoride wedge cavity 8, A detector 9, A lock-in amplifier 10, PI circuit 11, adder 12, high voltage amplifier 13, C signal generator 14, A signal generator 15, B detector 16, B signal generator 17, B lock-in amplifier 18, isolator 19; A signal generator 15, B signal generator 17, C signal generator 14 have the same structure; A phase modulator 3 and B phase modulator 4 have the same structure; A detector 9 and B detector 16 have the same structure; the fluoride wedge cavity 8 is made of fluoride crystal with an accuracy of 0.9999 or more, and the periphery is wedge-shaped disc;

Wherein, the A phase modulator 3 and the B phase modulator 4 are arranged up and down in the center of the silicon substrate, and the A and B phase modulators 3 and 4 are arranged on the right side of the A ring resonator 5 and the B ring resonator 6 distributed up and down; A , The left side of B phase modulator 3, 4 arranges laser 1, isolator 19 and beam splitter 2 sequentially from left to right, and the right side of A, B ring resonator 5, 6 arranges triangular prism 7 and fluorine in sequence from left to right Compound wedge cavity 8; A B signal generator 17 is arranged above the A phase modulator 3, and a B lock-in amplifier 18 is arranged above the B signal generator 17; A signal generator 15 is arranged below the B phase modulator 4, and the A signal generator A lock-in amplifier 10 is arranged under 15; a high-voltage amplifier 13 is arranged under the isolator 19, an adder 12 is arranged under the high-voltage amplifier 13, and a PI circuit 11 is arranged under the adder 12; a C signal generator 14 is arranged under the beam splitter 2; The B detector 16 is arranged above the resonator 5, and the A detector 9 is arranged below the B ring resonator 6;

The laser 1 is connected to the isolator 19, the isolator 19 is connected to the beam splitter 2, the beam splitter 2 is connected to the A phase modulator 3 and the B phase modulator 4 respectively, and the A phase modulator 3 is connected to the A ring resonator 5, The B phase modulator 4 is connected with the B ring resonator 6, the light output end of the A ring resonator 5 is vertically aligned with one side of the triangular prism 7 through the collimator, and the light output end of the B ring resonator 6 is vertical through the collimator Align the other side of the triangular prism 7, the bottom surface of the triangular prism 7 and the fluoride wedge-shaped cavity 8 are coupled through the evanescent field; the laser 1 is connected to the high-voltage amplifier 13, and the high-voltage amplifier 13 is connected to the adder 12, and the adder 12 passes through the switch 20 Be connected with C signal generator 14, adder 12 is also connected with PI circuit 11, and PI circuit 11 is connected with A lock-in amplifier 10, and A lock-in amplifier 10 is connected with A signal generator 15 and A detector 9 respectively, A signal Generator 15 is connected with A phase modulator 3, and A detector 9 is connected with B ring resonator 6; B lock-in amplifier 18 is connected with B signal generator 17 and B detector 16 respectively, and B signal generator 17 is connected with B phase The modulator 4 is connected, and the B detector 16 is connected to the A ring resonator 5 .

In the present invention, the triangular prism 7 and the fluoride wedge cavity 8 constitute a resonant cavity, the structure of the fluoride wedge cavity 8 is shown in Figures 2 and 3, and the coupling principle of the triangular prism 7 and the fluoride wedge cavity 8 is shown in Figure 4 Show;

Optical path of the present invention, circuit trend are:

The light source exits from the laser 1 and enters the isolator 19 for isolation and then enters the beam splitter 2 for splitting;

The light beam split by beam splitter 2 is divided into beam 1 and beam 2, and beam 1 and beam 2 enter A phase modulator 3 and B phase modulator 4 respectively, and then pass through A ring resonator 5 and B ring resonator 6 come out;

The modulated light emitted from the A ring resonator 5 enters the prism from the direction perpendicular to the 201 side of the triangular prism 7 and is totally reflected on the bottom surface of the prism 203 after being refracted, and is output from the 202 side of the prism, and the modulated light emitted from the B ring resonator 6 Enter the prism from the direction perpendicular to the 202 side of the triangular prism 7 and output it from the 201 side of the prism at the prism 203 bottom surface after refraction;

These two beams of light waves generate an evanescent field between the 203 bottom surface of the triangular prism 7 and the gap between the fluoride cavity and the two beams of light waves are coupled into the triangular prism 7, wherein the light entering through the 201 side of the triangular prism 7 is in the fluoride cavity A counterclockwise CCW beam is formed, and the light entering the cavity through the 202 side of the triangular prism 7 forms a clockwise CW light in the fluoride cavity, and the counterclockwise beam CCW entering the fluoride resonator circulates out and enters the B ring resonator 6, which is A detector 9 detects;

As shown in Figure 1, the light beam transmitted in the CCW direction is converted into an electrical signal by the A detector 9 and then demodulated and output by the A lock-in amplifier 10 to obtain an error signal for feedback control of the laser light wave frequency. The existence of the error signal, the PI circuit 11 The control function is carried out all the time, and the final result makes the error signal zero, and the frequency of the laser output light wave at this time is locked at the resonant frequency point of the CCW direction of the fluoride wedge cavity 8;

At this time, the resonant light beam in the CW direction is demodulated to the B lock-in amplifier 18 by the B detector 16, and the output is a gyro signal, thereby realizing a single-channel closed-loop control system.

During specific implementation, the laser 1 is a stable single-frequency solid-state laser with a polarization-maintaining optical fiber and a narrow spectral line; the A phase modulator 3 and the B phase modulator 4 are both low-amplitude modulation phase modulators; the PI circuit 11 has A good feedback control circuit; the triangular prism 7 is an isosceles right-angle triangular prism, and its reflectivity can be achieved by coating to reach more than 0.9; the wedge angle θ of the fluoride wedge cavity 8 is 20°.

Claims (2)

1. A resonant optical gyro based on a high-K fluoride resonant cavity, characterized in that it includes a laser (1), a beam splitter (2), an A phase modulator (3), and a B phase integrated on a silicon substrate. Modulator (4), A Ring Resonator (5), B Ring Resonator (6), Triangular Prism (7), Fluoride Wedge Cavity (8), A Detector (9), A Lock-in Amplifier (10) , PI circuit (11), adder (12), high voltage amplifier (13), C signal generator (14), A signal generator (15), B detector (16), B signal generator (17), B lock-in amplifier (18), isolator (19); A signal generator (15), B signal generator (17), C signal generator (14) have the same structure; A phase modulator (3), B The phase modulators (4) have the same structure; the A detector (9) and the B detector (16) have the same structure; the fluoride wedge-shaped cavity (8) is made of fluoride crystal with an accuracy of 0.9999 or more, and the peripheral Discs designed for wedges; Among them, the A phase modulator (3) and the B phase modulator (4) are arranged up and down in the center of the silicon substrate, and the A and B phase modulators (3, 4) are arranged on the right side of the A ring resonator (5) distributed up and down. and B ring resonator (6); the left side of A and B phase modulators (3, 4) arranges laser (1), isolator (19) and beam splitter (2) sequentially from left to right, A and B ring On the right side of the resonator (5, 6), a triangular prism (7) and a fluoride wedge cavity (8) are arranged in sequence from left to right; a B signal generator (17) is arranged above the A phase modulator (3), and the B signal is generated B lock-in amplifier (18) is arranged above the B phase modulator (17); A signal generator (15) is arranged below the B phase modulator (4), and A lock-in amplifier (10) is arranged below the A signal generator (15); A high-voltage amplifier (13) is arranged under the high-voltage amplifier (19), an adder (12) is arranged under the high-voltage amplifier (13), and a PI circuit (11) is arranged under the adder (12); a C signal generator is arranged under the beam splitter (2) (14); A detector B (16) is arranged above the A ring resonator (5), and an A detector (9) is arranged below the B ring resonator (6); The laser (1) is connected to the isolator (19), the isolator (19) is connected to the beam splitter (2), and the beam splitter (2) is respectively connected to the A phase modulator (3) and the B phase modulator (4) , the A phase modulator (3) is connected to the A ring resonator (5), the B phase modulator (4) is connected to the B ring resonator (6), and the light output port of the A ring resonator (5) passes through the collimator Vertically align one side of the triangular prism (7), the light output end of the B ring resonator (6) is vertically aligned with the other side of the triangular prism (7) through the collimator, and the bottom surface of the triangular prism (7) is aligned with the fluoride The wedge cavity (8) is coupled through the evanescent field; the laser (1) is connected to the high-voltage amplifier (13), the high-voltage amplifier (13) is connected to the adder (12), and the adder (12) is generated with the C signal through the switch (20) The adder (14) is connected, the adder (12) is also connected with the PI circuit (11), the PI circuit (11) is connected with the A lock-in amplifier (10), and the A lock-in amplifier (10) is respectively connected with the A signal generator (15 ) is connected with A detector (9), A signal generator (15) is connected with A phase modulator (3), A detector (9) is connected with B ring resonator (6); B lock-in amplifier (18) Connect to the B signal generator (17) and the B detector (16) respectively, the B signal generator (17) is connected to the B phase modulator (4), and the B detector (16) is connected to the A ring resonator (5) . 2. The resonant optical gyro based on the high-K fluoride resonant cavity according to claim 1, characterized in that: the wedge angle θ of the fluoride wedge cavity (8) is 20°.