Compact optical module for nuclear magnetic resonance gyroscope and design method

Abstract

The invention discloses a compact optical module for a nuclear magnetic resonance gyroscope and a design method. The optical module is composed of an optical path system and a circuit system, and the two parts are fixed on the same optical supporting framework. The optical system comprises a laser light source, a 1 / 2 wave plate, a polarization beam splitter, a 1 / 4 wave plate, a right-angle reflector, a linear polarizer and a photoelectric detector, and the circuit system comprises a switching circuit. Pump light and detection light are achieved through one laser beam, debugging of the pump light and the detection light of the gyroscope and compact design of an optical module are achieved in cooperation with an optical element and a photoelectric detector, and integration and miniaturization of the optical module are achieved on the whole. According to the invention, the defects of complex light path and large volume of the nuclear magnetic resonance gyroscope are overcome, the whole structure is simple, the realization is easy, and the miniaturization of the nuclear magnetic resonance gyroscope is realized.

Description

Technical Field

[0001] The present invention belongs to the technical field of miniaturization of nuclear magnetic resonance gyroscopes, and in particular relates to a compact optical module for a nuclear magnetic resonance gyroscope and a design method thereof. Background Art

[0002] In recent years, NMR gyroscope technology has rapidly advanced, with technical specifications essentially reaching the tactical application level. However, its size remains relatively large. NMR gyroscopes are generally divided into an optical module, an atomic gas chamber and temperature control module, a magnetic field control module, a signal detection module, and a control circuit module. Miniaturization of NMR gyroscopes requires miniaturization of each module, and the optical module is a key constraint on gyroscope miniaturization and integration.

[0003] Currently, in terms of optical module design, nuclear magnetic resonance gyroscopes generally use two laser light sources as the gyroscope's pump and probe lights. The output power, frequency, polarization, and beam quality of the pump and probe lights directly affect the atomic polarizability, polarization stability, and signal-to-noise ratio of signal detection, directly determining the overall performance of the gyroscope. Therefore, the output characteristics of the gyroscope light source are directly important to the gyroscope's performance. To achieve high-quality light source output, a large number of optical components must be arranged in the optical path system to realize functions such as independent beam shaping, polarization control, and power adjustment for the two light paths. At the same time, to achieve the adjustability of the optical components, corresponding control and adjustment structures must be reserved in the optical path structure. This not only increases the complexity of optical path debugging and system integration, but also leads to a larger overall optical path system volume, which is not conducive to the overall miniaturization of the gyroscope.

[0004] The signal detection module, serving as the feedback unit for laser control in a gyroscope, generally uses one photodetector to detect the pump light signal and implement closed-loop functions. Two photodetectors are used to implement functions such as detection and closed-loop detection of the detection light signal through differential detection. However, the differential detection method requires two photodetectors and corresponding optical components such as polarization beam splitters, which, to a certain extent, limits the miniaturization of the gyroscope. Summary of the Invention

[0005] The technical problem solved by the present invention is to overcome the deficiencies of the prior art and provide a compact optical module and design method for a nuclear magnetic resonance gyroscope, thereby achieving miniaturization and integration of the gyroscope optical system, reducing the overall volume of the gyroscope head, and overcoming the shortcomings of the original dual-light source system and the complex structure of the optical system that are not conducive to the debugging and miniaturization of the nuclear magnetic resonance gyroscope.

[0006] The object of the present invention is achieved through the following technical solutions: A compact optical module for a nuclear magnetic resonance gyroscope, comprising: an optical path system and a switching circuit; wherein the optical path system comprises a laser light source, a 1 / 2 wave plate, a polarization beam splitter, a 1 / 4 wave plate, a first right-angle reflector, a second right-angle reflector, a first linear polarizer, an atomic gas chamber, a third right-angle reflector, a second linear polarizer, a first photodetector and a second photodetector; the first photodetector and the second photodetector are both connected to the switching circuit; the switching circuit is connected to a gyroscope control circuit; the laser light emitted by the laser light source passes through the 1 / 2 wave plate After the polarization plate, the light is divided into pump light and detection light by a polarization beam splitter; the pump light passes through the 1 / 4 wave plate, the atomic gas chamber and the third right-angle reflector in sequence and reaches the first photodetector, and the first photodetector transmits the detected pump light signal to the switching circuit, and the switching circuit transmits the pump light signal to the gyro control circuit; the detection light passes through the first right-angle reflector, the second right-angle reflector, the first linear polarizer, the atomic gas chamber and the second linear polarizer in sequence and reaches the second photodetector, and the second photodetector transmits the detected detection light signal to the switching circuit, and the switching circuit transmits the detection light signal to the gyro control circuit.

[0007] In the above-mentioned compact optical module for the nuclear magnetic resonance gyroscope, the optical path system also includes an optical support frame; wherein the center of the optical support frame is hollowed out to form a frame hollow area; the atomic gas chamber is placed at the center of the frame hollow area.

[0008] In the above-mentioned compact optical module for a nuclear magnetic resonance gyroscope, the laser light source, the half-wave plate, the polarization beam splitter, the quarter-wave plate, the first right-angle reflector, the second right-angle reflector, the first linear polarizer, the third right-angle reflector, the second linear polarizer, the first photodetector, and the second photodetector are all arranged inside the optical support frame.

[0009] In the compact optical module for the nuclear magnetic resonance gyroscope, the optical support frame, the laser light source, the first photodetector, the second photodetector and the switching circuit are all non-magnetic.

[0010] In the above-mentioned compact optical module for nuclear magnetic resonance gyroscope, the 1 / 2 wave plate, polarization beam splitter, 1 / 4 wave plate, first right-angle mirror, second right-angle mirror, first linear polarizer, third right-angle mirror and second linear polarizer are all coated and do not contain magnetic materials.

[0011] In the above-mentioned compact optical module for a nuclear magnetic resonance gyroscope, the half-wave plate is closely attached to the incident light surface of the polarization beam splitter, and the quarter-wave plate is closely attached to the reflected light output surface of the polarization beam splitter; the first linear polarizer is closely attached to the light output surface of the second right-angle reflector, and the optical axis of the second linear polarizer is perpendicular to the optical axis of the first linear polarizer.

[0012] In the compact optical module for the nuclear magnetic resonance gyroscope, the half-wave plate is adhered to the incident light surface of the polarization beam splitter by gluing, and the quarter-wave plate is adhered to the reflected light output surface of the polarization beam splitter by gluing.

[0013] In the above-mentioned compact optical module for the nuclear magnetic resonance gyroscope, the first linear polarizer is adhered to the light-emitting surface of the second right-angle reflector by gluing.

[0014] In the above-mentioned compact optical module for the nuclear magnetic resonance gyroscope, the optical path system is placed at the center of the magnetic shielding and magnetic compensation system of the nuclear magnetic resonance gyroscope.

[0015] A compact optical module design method for a nuclear magnetic resonance gyroscope, comprising:

[0016] Fix the laser light source, 1 / 2 wave plate, polarization beam splitter, 1 / 4 wave plate, first right-angle reflector, second right-angle reflector, first linear polarizer, third right-angle reflector, second linear polarizer, first photodetector and second photodetector in the optical support frame, and connect the laser light source, first photodetector and second photodetector to the switching circuit;

[0017] The laser emitted by the laser light source passes through the 1 / 2 wave plate and is then divided into pump light and detection light by a polarization beam splitter; the first photodetector converts the pump light signal into a first current signal, the switching circuit outputs the first current signal to the external gyro control circuit and converts it into a first voltage signal, the second photodetector converts the detection light signal into a second current signal, the switching circuit outputs the second current signal to the external gyro control circuit and converts it into a second voltage signal; observe the first voltage signal, adjust the optical axis of the 1 / 2 wave plate, and ensure that the lowest position of the absorption peak signal of the atomic gas chamber is greater than the background noise of the first voltage signal, and at the same time adjust the optical axis angle of the 1 / 4 wave plate and the polarization of the pump light The direction is 45°, ensuring that the laser is circularly polarized after passing through the 1 / 4 wave plate, and then the 1 / 2 wave plate is glued to the incident light surface of the polarization beam splitter, and the / wave plate is glued to the reflected light output surface of the polarization beam splitter; first assemble the first linear polarizer, rotate the first linear polarizer to make the second voltage signal maximum, fix the first linear polarizer, and then assemble the second linear polarizer, rotate the second linear polarizer to make the second voltage signal minimum. At this time, the optical axis angle of the first linear polarizer and the second linear polarizer is 90°, and then glue and fix the first linear polarizer to the light output surface of the right-angle reflector, and fix the second linear polarizer in the frame of the optical support frame;

[0018] The optical path system is placed at the center of the magnetic shielding and magnetic compensation system of the nuclear magnetic resonance gyroscope.

[0019] Compared with the prior art, the present invention has the following beneficial effects:

[0020] (1) The present invention utilizes a single laser light source to generate pump light and probe light, thereby forming a gyro optical system. The optical system can be independently debugged, facilitating modular assembly and debugging of the gyro, thereby improving the mass production capability of the gyro.

[0021] (2) The present invention integrates the light source, optical elements, and detection devices into the same optical framework, reducing the complexity and volume of the gyro optical system and being suitable for miniaturization of nuclear magnetic resonance gyroscopes;

[0022] (3) The present invention uses a single photodetector to detect gyro signals by adopting a polarization-detection method, thereby reducing the number of photodetectors and the complexity of gyro signal detection, and further reducing the volume of the gyro optical module.

[0023] (4) The atomic gas chamber and the optical system of the present invention are separated, which facilitates the reuse of the atomic gas chamber and the optical system and the screening of the atomic gas chamber, and is beneficial to the standardized preparation of the optical, thermal, magnetic and other modules of the gyroscope. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Various other advantages and benefits will become apparent to those skilled in the art upon reading the detailed description of the preferred embodiment below. The accompanying drawings are for illustration purposes only and are not to be considered as limiting the present invention. The same reference symbols are used throughout the drawings to represent the same components. In the drawings:

[0025] Figure 1 This is a structural block diagram of a compact optical module for a nuclear magnetic resonance gyroscope provided by an embodiment of the present invention. DETAILED DESCRIPTION

[0026] The exemplary embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. Although exemplary embodiments of the present disclosure are shown in the accompanying drawings, it should be understood that the present disclosure can be implemented in various forms and should not be limited by the embodiments set forth herein. On the contrary, these embodiments are provided to enable a more thorough understanding of the present disclosure and to fully convey the scope of the present disclosure to those skilled in the art. It should be noted that, unless there is a conflict, the embodiments of the present disclosure and the features described in the embodiments can be combined with each other. The present invention will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0027] Figure 1 FIG is a block diagram of a compact optical module for a nuclear magnetic resonance gyroscope provided by an embodiment of the present invention. Figure 1 As shown, the compact optical module for the nuclear magnetic resonance gyroscope includes: an optical path system and a switching circuit 17.

[0028] The optical path system includes a laser light source 1, a 1 / 2 wave plate 2, a polarization beam splitter 3, a 1 / 4 wave plate 7, a first right-angle mirror 6, a second right-angle mirror 8, a first linear polarizer 9, an atomic gas chamber 10, a third right-angle mirror 12, a second linear polarizer 14, a first photodetector 15 and a second photodetector 16.

[0029] The first photodetector 15 and the second photodetector 16 are both connected to a switching circuit 17 ; the switching circuit 17 is connected to a gyro control circuit.

[0030] The laser light emitted by the laser light source 1 passes through the 1 / 2 wave plate 2 and is then divided into pump light 4 and probe light 13 by the polarization beam splitter 3. The pump light passes through the 1 / 4 wave plate 7, the atomic gas chamber 10 and the third right-angle reflector 12 in sequence before reaching the first photodetector 15. The first photodetector 15 transmits the detected pump light signal to the switching circuit 17, and the switching circuit 17 transmits the pump light signal to the gyroscope control circuit. The probe light passes through the first right-angle reflector 6, the second right-angle reflector 8, the first linear polarizer 9, the atomic gas chamber 10 and the second linear polarizer 14 in sequence before reaching the second photodetector 16. The second photodetector 16 transmits the detected detection light signal to the switching circuit 17, and the switching circuit 17 transmits the detection light signal to the gyroscope control circuit.

[0031] The photodetector and laser light source are mounted on the same side of the adapter circuit and connected to the gyro control circuit via the adapter circuit to detect the gyro signal. The adapter circuit is fixed to the right side of the optical path support frame after the optical device assembly is completed, and then placed in the center of the nuclear magnetic resonance gyroscope.

[0032] Atomic gas cell 10 is placed at the center of the optical support frame 5 and its hollow region 11. The pump light passes through quarter-wave plate 7, atomic gas cell 10, and right-angle mirror 12 before reaching photodetector 15. The probe light passes through right-angle mirror 6, right-angle mirror 8, linear polarizer 9, atomic gas cell 10, and linear polarizer 14 before reaching photodetector 16.

[0033] The photodetector 15 is fixed to the left side of the switching circuit 17. The photodetector 15 is used to detect the pump light signal after passing through the atomic gas chamber 10 and the right-angle reflector 12, and then connects the pump light signal to the gyro control circuit through the switching circuit 17 to realize the detection and control of the pump light;

[0034] The photodetector 16 is fixed to the left side of the switching circuit 17. The photodetector 16 is used to detect the detection light signal after passing through the atomic gas chamber 10 and the linear polarizer 14, and then connect the detection light signal to the gyro control circuit through the switching circuit 17 to realize the detection and control of the detection light signal;

[0035] The laser light source 1 is fixed to the left side of the switching circuit 17 and is connected to the gyro control circuit through the switching circuit 17 to realize the output and closed-loop control of the laser.

[0036] The optical path system includes an optical support frame 5, the center of which is hollowed out to form a hollow region 11 for accommodating an atomic gas cell 10. The interior of the optical support frame 4 houses a half-wave plate 2, a polarization beam splitter 3, a quarter-wave plate 7, a right-angle mirror 6, a right-angle mirror 8, a linear polarizer 9, a right-angle mirror 12, and a linear polarizer 14. Space is reserved on the right side of the optical support frame 4 for photodetectors 15, 16, and a laser light source 1.

[0037] The optical support frame 5, laser light source 1, photodetector 15, photodetector 16, and switching circuit 17 are all non-magnetic; the optical components 1 / 2 wave plate 2, polarization beam splitter 3, 1 / 4 wave plate 7, right-angle mirror 6, right-angle mirror 8, linear polarizer 9, right-angle mirror 12, and linear polarizer 14 are all coated and do not contain magnetic materials.

[0038] The half wave plate 2 is attached to the incident light surface of the polarization beam splitter 3, and the quarter wave plate 7 is attached to the reflected light surface of the polarization beam splitter 3. The angle between the optical axis of the half wave plate 2 and the polarization plane of the laser 1 is determined by the magnitude of the signal fed back by the photodetector 15.

[0039] The angle between the linear polarizer 9 and the polarization direction of the detection light passing through the right-angle reflector 8 is determined by the magnitude of the signal fed back by the photodetector 16. The optical axis of the linear polarizer 14 is perpendicular to that of the linear polarizer 9.

[0040] The half wave plate 2, the polarization beam splitter 3, the quarter wave plate 7, the right-angle mirror 6, the right-angle mirror 8, and the linear polarizer 9 are bonded together by gluing.

[0041] The photodetector 15, the photodetector 16 and the laser light source 1 are fixed to the switching circuit 17 and connected to the gyro control circuit through the switching circuit 17 to realize the detection of the gyro signal.

[0042] The switching circuit 17 is fixed to the optical path support frame 5 on which the optical device assembly has been completed, and then the whole circuit is placed at the center of the magnetic shielding and magnetic compensation system of the nuclear magnetic resonance gyroscope.

[0043] This embodiment also provides a compact optical module design method for a nuclear magnetic resonance gyroscope, the method comprising:

[0044] Fix the laser light source 1, half-wave plate 2, polarization beam splitter 3, quarter-wave plate 7, first right-angle reflector 6, second right-angle reflector 8, first linear polarizer 9, third right-angle reflector 12, second linear polarizer 14, first photodetector 15, and second photodetector 16 in the optical support frame 5, and connect the laser light source 1, first photodetector 15, and second photodetector 16 to the switching circuit 17;

[0045] The laser emitted by the laser light source 1 passes through the 1 / 2 wave plate 2 and is then divided into the pump light 4 and the detection light 13 by the polarization beam splitter 3; the first photodetector 15 converts the pump light signal into a first current signal, the switching circuit 17 outputs the first current signal to the external gyro control circuit and converts it into a first voltage signal, the second photodetector 16 converts the detection light signal into a second current signal, the switching circuit 17 outputs the second current signal to the external gyro control circuit and converts it into a second voltage signal; observe the first voltage signal, adjust the optical axis of the 1 / 2 wave plate 2, and ensure that the lowest position of the absorption peak signal of the atomic gas chamber is greater than the background noise of the first voltage signal, and at the same time adjust the optical axis angle of the 1 / 4 wave plate 7 to the polarization direction of the pump light. 45°, ensure that the laser is circularly polarized after passing through the 1 / 4 wave plate 7, then adhere the 1 / 2 wave plate 2 to the incident light surface of the polarization beam splitter 3 by gluing, and adhere the 1 / 4 wave plate 7 to the reflected light output surface of the polarization beam splitter 3 by gluing; first assemble the first linear polarizer 9, rotate the first linear polarizer 9 to make the second voltage signal maximum, fix the first linear polarizer 9, then assemble the second linear polarizer 14, rotate the second linear polarizer 14 to make the second voltage signal minimum,, at this time the optical axis angle of the first linear polarizer 9 and the second linear polarizer 14 is 90°, then glue and fix the first linear polarizer 9 to the light output surface of the right-angle reflector 8, and fix the second linear polarizer 14 in the frame of the optical support frame 5;

[0046] The optical path system is placed at the center of the magnetic shielding and magnetic compensation system of the nuclear magnetic resonance gyroscope.

[0047] Adjusting the optical axis angles of the half wave plate 2 and the quarter wave plate 7 according to the magnitude of the first voltage signal comprises the following steps:

[0048] (1) Observe the first voltage signal and adjust the optical axis of the 1 / 2 wave plate 2 to ensure that the lowest position of the absorption peak signal of the atomic gas chamber is greater than the background noise of the first voltage signal;

[0049] (2) Adjust the optical axis angle of the quarter wave plate 7 to 45° with the polarization direction of the pump light to ensure that the laser light is circularly polarized after passing through the quarter wave plate 7.

[0050] Adjusting the optical axis angles of the first linear polarizer 9 and the second linear polarizer 14 according to the magnitude of the second voltage signal includes the following steps:

[0051] (1) First, place the first linear polarizer 9, rotate the first linear polarizer 9 so that the voltage signal of the second photodetector 16 is maximized, and fix the optical axis of the first linear polarizer 9;

[0052] (2) Then place the second linear polarizer 14 and rotate the second linear polarizer 14 so that the voltage signal of the second photodetector 16 is minimum. The optical axis of the second linear polarizer 14 is fixed. At this time, the optical axis angle between the first linear polarizer 9 and the second linear polarizer 14 is 90°.

[0053] The design method of a compact optical module for a nuclear magnetic resonance gyroscope includes the following steps:

[0054] In step 101, optical components such as half-wave plate 2, polarization beam splitter 3, quarter-wave plate 7, right-angle mirror 6, right-angle mirror 8, linear polarizer 9, right-angle mirror 12, and linear polarizer 14 are sequentially fixed to optical support frame 5. Photodetector 15, photodetector 16, and laser light source 1 are uniformly fixed to adapter circuit 17, which is then fixed to optical support frame 5.

[0055] Step 102: Laser light 1 passes through half-wave plate 2 and polarization beam splitter 3, where it is split into pump light 13 and probe light 4. A photodetector 15 converts the pump light signal, which has sequentially passed through atomic gas cell 10 and right-angle reflector 12, into a current signal. A switching circuit 17 outputs the current signal to an external gyro control circuit, which converts it into a voltage signal. The optical axis angles of half-wave plate 2 and quarter-wave plate 7 are adjusted based on the voltage signal, and the photodetector 16 is then glued and fixed to polarization beam splitter 3. A photodetector 16 converts the probe light signal, which has sequentially passed through atomic gas cell 10 and linear polarizer 14, into a current signal. The switching circuit 17 outputs the current signal to an external gyro control circuit, which converts it into a voltage signal. The optical axis angles of linear polarizer 9 and linear polarizer 14 are adjusted based on the voltage signal, and the photodetector 16 is glued and fixed to right-angle reflector 8 and optical support frame 5, respectively.

[0056] Step 103 : Place the entire optical module at the center of the magnetic shielding and magnetic compensation system of the nuclear magnetic resonance gyroscope, and connect it to the gyroscope control circuit via the switching circuit 17 .

[0057] This embodiment uses a laser light source to realize pump light and detection light to form a gyroscope optical system. The optical system can be debugged independently, which facilitates the modular assembly and debugging of the gyroscope and improves the batch development capability of the gyroscope. This embodiment integrates the light source, optical elements and detection devices into the same optical skeleton, reducing the complexity and volume of the gyroscope optical system and is suitable for the miniaturization of nuclear magnetic resonance gyroscopes. This embodiment uses a photodetector to realize gyroscope signal detection by adopting a polarization and polarization analysis method, reducing the number of photoelectric detections, reducing the complexity of gyroscope signal detection, and further reducing the volume of the gyroscope optical module. This embodiment separates the atomic gas chamber and the optical system, which facilitates the reuse of the atomic gas chamber and the optical system and the screening of the atomic gas chamber, and is conducive to the standardized preparation of the optical, thermal, magnetic and other modules of the gyroscope.

[0058] Although the present invention has been disclosed above in terms of preferred embodiments, it is not intended to limit the present invention. Any person skilled in the art may make possible changes and modifications to the technical solutions of the present invention by using the methods and technical contents disclosed above without departing from the spirit and scope of the present invention. Therefore, any simple modifications, equivalent changes and modifications made to the above embodiments based on the technical essence of the present invention without departing from the content of the technical solutions of the present invention shall fall within the scope of protection of the technical solutions of the present invention.

Claims

1. A compact optical module for a nuclear magnetic resonance gyroscope, characterized in that include: Optical path system and switching circuit (17); wherein, The optical path system comprises a laser light source (1), a half-wave plate (2), a polarization beam splitter (3), a quarter-wave plate (7), a first right-angle reflector (6), a second right-angle reflector (8), a first linear polarizer (9), an atomic gas chamber (10), a third right-angle reflector (12), a second linear polarizer (14), a first photodetector (15), and a second photodetector (16); The first photodetector (15) and the second photodetector (16) are both connected to the switching circuit (17); the switching circuit (17) is connected to the gyro control circuit; The laser light emitted by the laser light source (1) passes through a half-wave plate (2) and is then divided into pump light (4) and probe light (13) by a polarization beam splitter (3); The pump light reaches the first photodetector (15) after passing through the quarter wave plate (7), the atomic gas chamber (10) and the third right-angle reflector (12) in sequence. The first photodetector (15) transmits the detected pump light signal to the switching circuit (17), and the switching circuit (17) transmits the pump light signal to the gyro control circuit. The detection light sequentially passes through a first right-angle reflector (6), a second right-angle reflector (8), a first linear polarizer (9), an atomic gas chamber (10), and a second linear polarizer (14) before reaching a second photodetector (16). The second photodetector (16) transmits the detection light signal obtained by detection to the switching circuit (17), and the switching circuit (17) transmits the detection light signal to a gyro control circuit.

2. The compact optical module for a nuclear magnetic resonance gyroscope according to claim 1, wherein: The optical path system further comprises an optical support frame (5); wherein the center of the optical support frame (5) is hollowed out to form a frame hollow area (11); and the atomic gas chamber (10) is placed at the center of the frame hollow area (11).

3. The compact optical module for a nuclear magnetic resonance gyroscope according to claim 2, wherein: The laser light source (1), the half-wave plate (2), the polarization beam splitter (3), the quarter-wave plate (7), the first right-angle reflector (6), the second right-angle reflector (8), the first linear polarizer (9), the third right-angle reflector (12), the second linear polarizer (14), the first photodetector (15), and the second photodetector (16) are all arranged inside the optical support frame (5).

4. The compact optical module for a nuclear magnetic resonance gyroscope according to claim 2, wherein: The optical support frame (5), the laser light source (1), the first photodetector (15), the second photodetector (16) and the switching circuit (17) are all non-magnetic.

5. The compact optical module for a nuclear magnetic resonance gyroscope according to claim 1, wherein: The half-wave plate (2), polarization beam splitter (3), quarter-wave plate (7), first right-angle reflector (6), second right-angle reflector (8), first linear polarizer (9), third right-angle reflector (12), and second linear polarizer (14) are all coated and do not contain magnetic materials.

6. The compact optical module for a nuclear magnetic resonance gyroscope according to claim 1, wherein: The 1 / 2 wave plate (2) is closely attached to the incident light surface of the polarization beam splitter (3), and the 1 / 4 wave plate (7) is closely attached to the reflected light output surface of the polarization beam splitter (3); The first linear polarizing plate (9) is closely attached to the light-emitting surface of the second right-angle reflector (8), and the optical axis of the second linear polarizing plate (14) is perpendicular to the optical axis of the first linear polarizing plate (9).

7. The compact optical module for a nuclear magnetic resonance gyroscope according to claim 6, wherein: The 1 / 2 wave plate (2) is adhered to the incident light surface of the polarization beam splitter (3) by gluing, and the 1 / 4 wave plate (7) is adhered to the reflected light output surface of the polarization beam splitter (3) by gluing.

8. The compact optical module for a nuclear magnetic resonance gyroscope according to claim 6, wherein: The first linear polarizing plate (9) is adhered to the light-emitting surface of the second right-angle reflector (8) by gluing.

9. The compact optical module for a nuclear magnetic resonance gyroscope according to claim 1, wherein: The optical path system is placed at the center of the magnetic shielding and magnetic compensation system of the nuclear magnetic resonance gyroscope.

10. A compact optical module design method for a nuclear magnetic resonance gyroscope, characterized in that include: The laser light source (1), the half-wave plate (2), the polarization beam splitter (3), the quarter-wave plate (7), the first right-angle reflector (6), the second right-angle reflector (8), the first linear polarizer (9), the third right-angle reflector (12), the second linear polarizer (14), the first photodetector (15), and the second photodetector (16) are fixed in the optical support frame (5), and the laser light source (1), the first photodetector (15), and the second photodetector (16) are all connected to the switching circuit (17); The laser light emitted by the laser light source (1) passes through a 1 / 2 wave plate (2) and is then divided into a pump light (4) and a detection light (13) by a polarization beam splitter (3); a first photodetector (15) converts the pump light signal into a first current signal, a switching circuit (17) outputs the first current signal to an external gyro control circuit and converts it into a first voltage signal, a second photodetector (16) converts the detection light signal into a second current signal, a switching circuit (17) outputs the second current signal to an external gyro control circuit and converts it into a second voltage signal; the first voltage signal is observed, the optical axis of the 1 / 2 wave plate (2) is adjusted to ensure that the lowest position of the absorption peak signal of the atomic gas chamber is greater than the background noise of the first voltage signal, and at the same time, the optical axis angle of the 1 / 4 wave plate (7) is adjusted to 45 degrees with respect to the polarization direction of the pump light, to ensure that Ensure that the laser light is circularly polarized after passing through the quarter wave plate (7), then adhere the half wave plate (2) to the incident light surface of the polarization beam splitter (3) by gluing, and adhere the quarter wave plate (7) to the reflected light output surface of the polarization beam splitter (3) by gluing; first assemble the first linear polarizer (9), rotate the first linear polarizer (9) to maximize the second voltage signal, fix the first linear polarizer (9), then assemble the second linear polarizer (14), rotate the second linear polarizer (14) to minimize the second voltage signal, at this time, the optical axis angle of the first linear polarizer (9) and the second linear polarizer (14) is 90 degrees, then glue and fix the first linear polarizer (9) to the light output surface of the right-angle reflector (8), and fix the second linear polarizer (14) in the frame of the optical support frame (5); The optical path system is placed at the center of the magnetic shielding and magnetic compensation system of the nuclear magnetic resonance gyroscope.

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