Precise testing environment for ultrahigh-precision optical fiber gyroscope

Abstract

The invention discloses a precision test environment for an ultrahigh-precision optical fiber gyroscope. The precision test environment comprises a high-stability workbench and a closed container, the high-stability workbench comprises a shell, a table top and a double-layer mass base. The double-layer mass base is arranged in the shell, and the upper surface of the double-layer mass base supports the table top through evenly-distributed ground feet. The double-layer quality base is used for realizing the overall stability of a full frequency band; the closed container is of a double-layer heat preservation structure. Thin-film resistance heating pieces are attached to the inner side of an inner heat preservation layer and the outer side of an outer heat preservation layer. The thin-film resistor heating sheet is connected with an external temperature control computer through a signal line; the ultrahigh-precision optical fiber gyroscope is arranged in the closed container, and the temperature control computer performs power-on and power-off control on the thin-film resistor heating sheet according to real-time temperature data around the optical fiber gyroscope; and the closed container is arranged on the surface of the high-stability workbench. According to the precise testing environment, the high-stability workbench is provided, and the high-stability temperature environment is provided.

Description

TECHNICAL FIELD

[0001] The present application relates to a kind of precision test environment for ultra-high precision fiber gyroscope, belong to fiber gyroscope test field. BACKGROUND

[0002] With the precision of fiber gyroscope is higher and higher, more and more stringent requirements are put forward to its working environment.For example, the precision of fiber gyroscope is better than 2 × 10 -4 ° / h (1h, 1σ), the inclination change of base is required to be less than 0.5° level.Therefore, precision test environment is particularly important for the index test of ultra-high precision fiber gyroscope ≤3 × 10 -6 ° / h (1h, 1σ).

[0003] Among many environmental factors affecting the measurement of fiber gyroscope, temperature and vibration are greater influence factors.Temperature affects the non-reciprocity error of fiber ring of fiber interferometer, photoelectronic device error, circuit error and structural deformation and the transmission error caused by various structural deformations, vibration is mainly caused by the transmission of external environmental disturbance through foundation, affecting the stress error and its non-reciprocity error of fiber interferometer, linear vibration and angular vibration error, structural creep, etc.In the construction of high-precision inertial instrument test environment, the research of the United States is more advanced.In 1990, the advanced inertial test laboratory (AITL) of the central inertial guidance and GPS laboratory (CIGTF) of the United States, the stability index of anti-microseismic stable platform (SSP) reaches, DC-100Hz, the angular stability is better than The translation stability is better than Since 2007, this laboratory has developed a goal to break through the existing nano-level (10 -9 ) stability level to pico-level (10 -12 ) level.At present, the level of stability platform of domestic inertial test laboratory has realized that the inclination stability is better than 0.18° / h, and the translation stability is better than 1 × 10 -7 g level.Therefore, the construction technology of precision test environment of inertial instrument has been the research direction of scholars at home and abroad. SUMMARY

[0004] The technical problem to be solved by the present application is to overcome the shortcomings of the prior art and provide a precision test environment for ultra-high precision fiber gyroscope.

[0005] The technical solution of the present application is:

[0006] A precision test environment for ultra-high precision fiber gyroscope, comprising a high-stability workbench and a sealed container.

[0007] The high-stability workbench comprises a shell, a table top, and a double-layer mass base; the double-layer mass base is arranged in the shell, and the upper surface of the double-layer mass base supports the table top through evenly distributed foot supports; the double-layer mass base is used to realize the overall stability of the full frequency band.

[0008] The sealed container comprises a box body and a bottom support, the box body is fixed on the bottom support, the box body has a double-layer heat preservation structure, the inner side of the inner heat preservation layer and the outer side of the outer heat preservation layer are attached with thin film resistance heating sheets; the thin film resistance heating sheets are connected with the external temperature control computer through signal lines;

[0009] The ultra-high precision fiber-optic gyroscope is arranged in the sealed container, platinum resistors are arranged around the fiber-optic gyroscope, temperature data at different positions are collected in real time, and are transmitted to the temperature control computer through a temperature control bus, the temperature control computer controls the thin film resistance heating sheets to be powered on or powered off according to the real-time temperature data, so as to realize dynamic temperature adjustment.

[0010] The sealed container is arranged on the table top of the high-stability workbench.

[0011] Preferably, the double-layer mass base comprises an anti-micro-vibration mass layer and a reaction mass layer; the anti-micro-vibration mass layer is arranged at the bottom of the shell and is attached with vibration isolation materials at the contact position with the shell, and the upper surface of the anti-micro-vibration mass layer is attached with vibration isolators for supporting the reaction mass layer; the upper surface of the reaction mass layer is supported by the evenly distributed foot supports.

[0012] Preferably, the temperature control bus adopts a redundant double-channel design.

[0013] Preferably, the ultra-high precision fiber-optic gyroscope adopts an opto-electric separation type structure, non-heating components are arranged in a light path assembly of the fiber-optic gyroscope, and heating components are arranged in a control assembly of the fiber-optic gyroscope; the two assemblies are connected through a wire harness.

[0014] Preferably, the light path assembly of the fiber-optic gyroscope comprises an upper end cover, a waveguide base, a fiber ring upper cover, a fiber ring, a fiber ring base, a gasket, and a mounting base,

[0015] The fiber ring base is arranged on the mounting base, the gasket is arranged between the fiber ring base and the mounting base, the fiber ring is arranged on the fiber ring base, the fiber ring upper cover covers the fiber ring, the fiber ring upper cover and the fiber ring base form a magnetic shielding cavity through laser sealing, and a first layer of magnetic shielding of the fiber ring is formed.

[0016] The waveguide base is arranged on the fiber ring upper cover, and the upper end cover covers the waveguide base; the upper end cover and the gasket are fastened through screws to form a second layer of magnetic shielding of the fiber ring.

[0017] Preferably, the fiber ring upper cover and the fiber ring base, and the upper end cover and the gasket are all made of iron-nickel alloy.

[0018] Preferably, the high-stability workbench is provided with a disturbance monitoring system for monitoring the tilt and vibration of the platform to ensure that the tilt stability of the high-stability workbench meets the requirements.

[0019] Preferably, the disturbance monitoring system detects in the following manner:

[0020] Two tilt sensors are placed diagonally on the workbench, the output values of the tilt sensors are collected, the sampling frequency is 1 Hz, and the sampling time is the 1st hour, the 2nd hour,..., and the nth hour.

[0021] The output tilt change value of the kth tilt sensor in the nth hour is calculated in the following manner:

[0022] x direction:

[0023]

[0024] The x-direction tilt component change value of the kth tilt sensor in the nth hour, n = 1, 2, 3,..., 8, k = 1, 2. The x-direction tilt measurement value of the kth tilt sensor at time i.

[0025] y direction:

[0026]

[0027] The y-direction tilt component change value of the kth tilt sensor in the nth hour, k = 1, 2. The y-direction tilt measurement value of the kth tilt sensor at time i.

[0028] The comprehensive tilt change value output by the kth tilt sensor in the nth hour

[0029]

[0030] The total tilt change value output by the two tilt sensors in the same time period:

[0031]

[0032] The tilt stability S is calculated in the following manner:

[0033]

[0034] The average value of the tilt sensor observation period.

[0035] An evaluation method for a precision test environment of an ultra-high precision fiber-optic gyroscope, Fourier transform is performed on obtained fiber-optic gyroscope test data to realize spectrum analysis, and environment evaluation is performed according to the change trend of the spectrum diagram.

[0036] Compared with the prior art, the present application has the following advantages:

[0037] The present application realizes precision test and evaluation of an ultra-high precision fiber-optic gyroscope through design of a high-stability workbench, design of a high-stability temperature environment and precision structure design of the ultra-high precision fiber-optic gyroscope, namely, providing a high-stability workbench and a high-stability temperature environment, thereby breaking through the test bottleneck that the precision improvement of the ultra-high precision fiber-optic gyroscope is limited by the surrounding environment.

[0038] The high-stability workbench in the precision test environment is designed to adopt a multi-stage vibration isolation and disturbance monitoring system to realize a low-vibration disturbance working environment, and finally, two high-resolution tilt angle sensors are installed at diagonal positions of the high-stability workbench to measure the tilt angle of the workbench, so that the data of the ultra-high precision fiber-optic gyroscope can be further tilt angle compensated.

[0039] The high-stability temperature environment in the precision test environment is designed to adopt a multi-stage temperature control and temperature monitoring system to realize a low-temperature disturbance working environment, and a film resistance heating sheet is attached to the outside of the two thermal insulation layers, the heating power of the film resistance heating sheet is accurately adjusted through pulse width modulation (PWM), and dynamic temperature control is realized.

[0040] The present application provides a fiber-optic gyroscope precision test environment self-evaluation technology using Fourier transform. Without adding any other sensing device, only the data measured by the gyroscope itself is used for time-frequency analysis, and the evaluation of the test environment can be completed. BRIEF DESCRIPTION OF DRAWINGS

[0041] Figure 1 It is an outline drawing of the ultra-high precision fiber-optic gyroscope of the present application;

[0042] Figure 2 It is an exploded view of the optical path assembly of the fiber-optic gyroscope of the present application;

[0043] Figure 3 It is a schematic diagram of the construction of the high-stability workbench of the fiber-optic gyroscope of the present application;

[0044] Figure 4 It is a tilt angle output change curve of the precision environment installation base of the present application-1 hour smoothing;

[0045] Figure 5 It is a schematic diagram of the construction of the high-stability temperature environment of the fiber-optic gyroscope of the present application;

[0046] Figure 6The precision environmental temperature change rate test curve-1 hour smoothing of the present application;

[0047] Figure 7 The super high precision fiber optic gyroscope test curve-1 hundred seconds smoothing of the present application;

[0048] Figure 8 The super high precision fiber optic gyroscope test curve-1 hour smoothing of the present application;

[0049] Figure 9 The super high precision fiber optic gyroscope test data Fourier transform under the precision test environment of the present application. DETAILED DESCRIPTION

[0050] The present application is further illustrated below in conjunction with the drawings and examples.

[0051] The precision structure design of the super high precision fiber optic gyroscope is as shown in Figure 1 , an optoelectronic separation type structure design is adopted, non-heat generating components are installed in the fiber optic gyroscope optical path assembly 1, and heat generating components are installed in the fiber optic gyroscope control assembly 2. The two assemblies are connected through a wire harness to achieve complete isolation of the heat generating components and the non-heat generating components, thereby ensuring the temperature stability of the fiber ring. The non-heat generating components include a fiber coupler, a Y waveguide, and a fiber ring, which are installed in the fiber optic gyroscope optical path assembly. The heat generating components include a light source, a detector, an analog circuit, and a digital circuit, which are installed in the fiber optic gyroscope control assembly.

[0052] The fiber optic gyroscope optical path assembly 1 is as shown in Figure 2 , including an upper end cover 11, a waveguide base 12, a fiber ring upper cover 13, a fiber ring 14, a fiber ring base 15, a gasket 16, and a mounting base 17. The fiber optic gyroscope control assembly 2 includes a light source, a detector, an analog circuit, and a digital circuit. The material of the fiber optic gyroscope control assembly is selected to be aluminum alloy, which provides a good heat path for the heat generating components.

[0053] The fiber ring base 15 is located on the mounting base 17, and the gasket 16 is arranged between the fiber ring base 15 and the mounting base 17. The fiber ring 14 is located on the fiber ring base 15, the fiber ring upper cover 13 covers the fiber ring 14, the waveguide base 12 is located on the fiber ring upper cover 13, and the upper end cover 11 covers the waveguide base 12.

[0054] The fiber ring, as the core sensitive component, needs to be designed with double-layer magnetic shielding and thermal insulation. The double-layer magnetic shielding of the fiber ring is composed of the upper end cover 11, the fiber ring upper cover 13, the fiber ring base 15, and the gasket 16, and the magnetic shielding material is selected to be iron-nickel alloy. The fiber ring upper cover 13 and the fiber ring base 15 form a magnetic shielding cavity through laser sealing, forming the first layer of magnetic shielding. The upper end cover 11 and the gasket 16 form the second layer of magnetic shielding through screw fastening. The thermal insulation design of the fiber ring is achieved by physically isolating the heat generating components.

[0055] The design of the high-stability workbench adopts multi-stage vibration isolation and disturbance monitoring system to provide a low-vibration and low-disturbance working environment for the ultra-high-precision fiber-optic gyroscope. Figure 3 The structure supporting the stability of the designed double-layer mass base stable platform is composed of two main parts: the anti-micro-vibration mass layer and the reaction mass layer. According to the test data of soil disturbance characteristics, a vibration isolation material cushion layer is designed under the anti-micro-vibration mass layer to fully attenuate external disturbances. A large integral anti-micro-vibration mass layer is adopted to attenuate disturbances on the right side of the turning frequency. By controlling the reaction mass, the stability of the turning frequency left side and the self-disturbance can be attenuated to achieve overall stability in the full frequency band. By actively controlling the reaction mass layer through the vibration isolator, the stability of the turning frequency left side and the self-stability of the working surface of the stable platform can be greatly reduced by an order of magnitude.

[0056] The material of the anti-micro-vibration mass layer is concrete, with a length and width of several meters and a weight of several dozen tons. The anti-micro-vibration mass layer is usually buried several meters to several dozen meters underground. The periphery of the anti-micro-vibration mass layer needs to be surrounded by multiple layers of vibration isolation materials to attenuate the energy of external disturbances. Sand is usually selected as the vibration isolation material, which can absorb the energy penetration between seasons due to the mutual movement of sand particles. Thick dry sand can absorb the disturbance energy generated by the swaying of trees and tall buildings due to wind blowing. The material of the reaction mass layer is also concrete, which is supported by air springs above the anti-micro-vibration mass layer and can be designed in a "T" shape with the mass sinking. The external disturbance is attenuated twice by the air springs and the inertia of its own weight. In this invention, the working surface is flush with the laboratory floor.

[0057] The disturbance monitoring system of the high-stability workbench mainly uses high-resolution tilt sensors to monitor the inclination and vibration of the platform. The resolution of the tilt sensor generally needs to reach 0.1". The test tooling of the tilt sensor should be made of materials with zero thermal expansion coefficient, such as microcrystalline glass material with a temperature coefficient of 10 -8 / ℃ order. Compared with metal materials with a temperature coefficient of 10 -5 / ℃ order, the tooling tilt angle change caused by thermal expansion can be reduced. In addition, the new pendulum tilt sensor replaces the analog output with digital output, which can further improve the tilt measurement resolution, with a maximum of 0.01" / Hz 1 / 2 @10 -3 Hz-1Hz precision level. The real-time monitoring data of the monitoring system can provide necessary data support for the establishment of the error model of the ultra-high-precision fiber-optic gyroscope.

[0058] Figure 4The base tilt output change curve is installed in a precision environment. The test method is to place two high-resolution tilt sensors diagonally on the workbench, adjust the output value of the tilt sensor, the sampling frequency is 1 Hz, the sampling time is 8 hours, and the output data is uploaded to the computer. The calculated tilt stability S is 0.088", which meets the requirement of less than 0.1".

[0059] The collected tilt values are processed as follows:

[0060] The output tilt change value of the kth tilt sensor at the nth hour is:

[0061] x direction:

[0062]

[0063] In formula (1): The x-direction tilt component change value of the kth tilt sensor (k = 1, 2) at the nth hour (n = 1, 2, 3,..., 8); The x-direction tilt measurement value of the kth tilt sensor at time i.

[0064] y direction:

[0065]

[0066] In formula (2): The y-direction tilt component change value of the kth tilt sensor (k = 1, 2) at the nth hour (n = 1, 2, 3,..., 8); The y-direction tilt measurement value of the kth tilt sensor at time i.

[0067] The comprehensive tilt change value obtained by combining the two directions is:

[0068]

[0069] In formula (3): The comprehensive tilt change value output by the kth tilt sensor at the nth hour.

[0070] Total tilt change:

[0071]

[0072] In formula (4): The total tilt change output by the two tilt sensors in the same time period.

[0073] The tilt stability calculation method is

[0074]

[0075] In formula (5), S represents the output standard deviation, which represents the stability of the inclination angle.

[0076] The average value of the level meter observation period.

[0077] The design of the high-stability temperature environment is as follows Figure 5 , which uses a multi-stage temperature control and temperature monitoring system to provide a low-temperature disturbance working environment for the ultra-high-precision fiber-optic gyroscope. A temperature-controlled sealed container for the ultra-high-precision fiber-optic gyroscope is designed, which has the functions of heat dissipation and heating. When the ambient temperature is higher than the set temperature, the container dissipates heat. When the ambient temperature is lower than the set temperature, the container heats up. Since the ambient temperature is generally in a low-temperature state, the heating function of the sealed container is emphasized.

[0078] The temperature-controlled sealed container has a double-layer insulation structure, and the outer side of the two insulation layers is covered with a film resistance heating sheet. The temperature control computer accurately adjusts the heating power of the film resistance heating sheet according to real-time temperature data through pulse width modulation (PWM).

[0079] The temperature-controlled sealed container is arranged around the fiber-optic gyroscope with high-precision platinum resistors, which collect temperature data at different positions in real time for environmental temperature monitoring and collection, and transmit the data to the temperature control computer through a temperature control bus. The temperature control bus uses a redundant dual-channel design to avoid signal interruption. The temperature control computer receives the temperature data and uses a fuzzy PID algorithm to perform real-time temperature control.

[0080] Figure 6 The temperature change rate test curve is shown in the following figure. The test method is as follows: four high-precision platinum resistors are evenly placed in the sealed container, the output value of the temperature sensor is set, the sampling frequency is 1 Hz, the sampling time is 8 hours, and the output data is uploaded to the computer. The maximum temperature change rate is 0.06℃ / h, which meets the requirement of 0.1℃ / h.

[0081] The specific processing steps for the collected temperature values are as follows:

[0082] The jth temperature sensor outputs a temperature value every hour:

[0083]

[0084] In formula (6), T jn is the nth temperature output value of the jth temperature sensor (j-1, 2,..., 4) at the nth time (n=1, 2, 3,..., 8);

[0085] t i is the original sampling value of the temperature sensor at the ith time.

[0086] The temperature output value of the integrated 4-way temperature sensor is

[0087]

[0088] In formula (7), δT is the output temperature change rate. The temperature average value outputted by the integrated 4-way temperature sensor in the same time period.

[0089] The temperature change rate calculation method is

[0090]

[0091] In formula (8), δT is the output temperature change rate.

[0092] The self-evaluation method of the precision test environment adopts the optical fiber gyroscope precision test environment self-evaluation technology of Fourier transform to evaluate the test environment. Fourier transform is a commonly used analysis method, mainly including Fourier transform of non-periodic signals and Fourier series of periodic signals. Most of the signals collected by computers are discrete and non-periodic, and only the Fourier transform of non-periodic signals is discussed below. The Fourier transform of non-periodic signals mainly includes continuous non-periodic Fourier transform, sequence (discrete non-periodic) Fourier transform and discrete Fourier transform. Among them, the Fourier transform of sequence is a continuous periodic function with a period of 2π. However, computers process discrete finite length signals, so the discrete Fourier transform is mainly considered.

[0093] The self-evaluation method of the precision test environment collects the output data of the ultra-high precision optical fiber gyroscope, the sampling frequency is 1Hz, the sampling time is 8h, and the output data is uploaded to the gyroscope data processing computer. Using Matlab software, the discrete Fourier transform of the data is carried out, the change trend of the frequency spectrum graph is observed, and the mean and variance of the frequency spectrum graph are calculated, so that the test environment can be evaluated.

[0094] Figure 7 For the ultra-high precision optical fiber gyroscope test curve-1 hundred second smoothing, Figure 8 For the ultra-high precision optical fiber gyroscope test curve-1 hour smoothing. The test method is to place the ultra-high precision optical fiber gyroscope in a sealed container together with the sealed container on the workbench, set the output value of the optical fiber gyroscope, the sampling frequency is 1Hz, and the sampling time is 8h. Upload the output data to the computer. The calculated bias stability is 2.25×10 -6 ° / h (1h, 1σ), which meets the requirement of ≤3×10 -6 ° / h (1h, 1σ).

[0095] Figure 9For the Fourier transform of the ultra-high precision fiber optic gyroscope test data in the precise test environment, it can be seen from the frequency spectrum that there are only a few large frequency points on the frequency spectrum, and a few small amplitude frequency points appear around them, which have harmonic and convergent characteristics, indicating that the time domain signal contains a periodic signal with low complexity. The mean of the frequency spectrum is 3.4159, and the variance is 2.6532, which is small. Therefore, from the change rule and degree of the frequency spectrum, it can be shown that the test environment has high stability.

[0096] The precision of the ultra-high precision fiber optic gyroscope of the present application is ≤2×10 -6 ° / h(1h, 1σ), compared with the precision of the medium and high precision fiber optic gyroscope ≤2×10 -4 ° / h(1h, 1σ), which is improved by two orders of magnitude, and puts forward very strict requirements for the test environment: the stability of the installation base is <0.05", and the temperature change rate is <0.05℃ / h. Therefore, a precise test environment is constructed, that is, a high-stability workbench is provided, and a high-stability temperature environment is provided.

[0097] The design of the high-stability workbench in the precise test environment of the present application adopts a multi-stage vibration isolation and disturbance monitoring system to realize a low-vibration disturbance working environment. Finally, an inclination error compensation is performed, two high-resolution inclination sensors are installed at the diagonal positions of the high-stability workbench to measure the inclination angle of the workbench, and the inclination of the ultra-high precision fiber optic gyroscope data is compensated. The inclination sensor measures the directional change of the observation plane, and the output of the fiber optic gyroscope is affected by the directional change of the observation plane. For example, in the extreme case of changing 180°, the sensitive axis of the fiber optic gyroscope changes 180°, and the corresponding output changes from positive to negative or from negative to positive. Therefore, there is a one-to-one correspondence between the output of the fiber optic gyroscope and the directional change of the plane, that is, there is a one-to-one correspondence between the data sensitive to the inclination sensor. The least square method is used to establish a model between the output of the fiber optic gyroscope and the inclination sensor, which can be used to compensate the output of the fiber optic gyroscope.

[0098] The design of the high-stability temperature environment in the precise test environment of the present application adopts a multi-stage temperature control and temperature monitoring system to realize a low-temperature disturbance working environment. Thin film resistance heating sheets are attached to the outside of the two insulation layers, and the power is accurately adjusted through pulse width modulation (PWM) to realize dynamic temperature control.

[0099] The self-evaluation technology of the precise test environment of the present application proposes a fiber optic gyroscope test environment self-evaluation technology based on Fourier transform. Without adding any sensor, only the data of the ultra-high precision fiber optic gyroscope is collected, and the Fourier transform is used for frequency spectrum analysis to observe the change trend of the frequency spectrum and evaluate the test environment.

[0100] The contents not described in detail in the specification of the present application are known to those skilled in the art.

Claims

1. A precision testing environment for ultra-high precision fiber optic gyroscopes, characterized in that, Including highly stable workbenches and sealed containers; The high-stability worktable includes a shell, a tabletop, and a double-layer mass base; the double-layer mass base is placed in the shell, and the upper surface of the double-layer mass base supports the tabletop through evenly distributed feet; the double-layer mass base is used to achieve overall stability across the entire frequency band. The sealed container includes a box body and a bottom support. The box body is fixed on the bottom support. The box body has a double-layer insulation structure. Thin film resistance heating elements are attached to the inner side of the inner insulation layer and the outer side of the outer insulation layer. The thin film resistance heating elements are connected to an external temperature control computer via signal lines. An ultra-high precision fiber optic gyroscope is placed in a sealed container, and platinum resistance thermometers are arranged around the fiber optic gyroscope to collect temperature data at different locations in real time. The data is then transmitted to a temperature control computer via a temperature control bus. The temperature control computer controls the power on / off of the thin-film resistance heating element based on the real-time temperature data to achieve dynamic temperature regulation. The sealed container is placed on a highly stable workbench.

2. The precision testing environment for ultra-high precision fiber optic gyroscopes according to claim 1, characterized in that, The double-layer mass base includes a micro-vibration-resistant mass layer and a reaction mass layer. The micro-vibration-resistant mass layer is located at the bottom of the shell, and vibration isolation material is arranged at the contact parts with the shell. Vibration isolators are evenly distributed on the upper surface to support the reaction mass layer. The upper surface of the reaction mass layer is supported by evenly distributed feet.

3. The precision testing environment for ultra-high precision fiber optic gyroscopes according to claim 1, characterized in that, The temperature control bus adopts a redundant dual-channel design.

4. The precision testing environment for ultra-high precision fiber optic gyroscopes according to claim 1, characterized in that, The ultra-high precision fiber optic gyroscope adopts a photoelectric separation structure. The non-heat-generating components are installed in the optical path assembly of the fiber optic gyroscope, while the heat-generating components are installed in the control assembly of the fiber optic gyroscope. The two assemblies are connected by a wiring harness.

5. A precision testing environment for an ultra-high precision fiber optic gyroscope according to claim 1, characterized in that, The fiber optic gyroscope optical path assembly (1) includes an upper end cover (11), a waveguide base (12), a fiber optic ring upper cover (13), a fiber optic ring (14), a fiber optic ring base (15), a gasket (16), and a mounting base (17). The fiber optic ring base (15) is located on the mounting base (17). A gasket (16) is provided between the fiber optic ring base (15) and the mounting base (17). The fiber optic ring (14) is located on the fiber optic ring base (15). The fiber optic ring cover (13) covers the fiber optic ring (14). The fiber optic ring cover (13) and the fiber optic ring base (15) are connected by laser sealing to form a magnetic shielding cavity, forming the first layer of magnetic shielding of the fiber optic ring. The waveguide base (12) is located on the fiber ring cover (13), and the upper cover (11) covers the waveguide base (12); the upper cover (11) and the gasket (16) are fastened together by screws to form the second layer of magnetic shielding of the fiber ring.

6. A precision testing environment for an ultra-high precision fiber optic gyroscope according to claim 5, characterized in that, The fiber optic ring top cover (13), fiber optic ring base (15), top cover (11), and gasket (16) are all made of iron-nickel alloy.

7. A precision testing environment for an ultra-high precision fiber optic gyroscope according to claim 1, characterized in that, The high-stability workbench is equipped with a disturbance monitoring system to monitor the tilt and vibration of the platform, ensuring that the tilt stability of the high-stability workbench meets the requirements.

8. A precision testing environment for an ultra-high precision fiber optic gyroscope according to claim 1, characterized in that, The disturbance monitoring system uses the following detection method: Two tilt sensors are placed diagonally on the workbench, and the output values ​​of the tilt sensors are collected. The sampling frequency is 1Hz, and the sampling time is the first hour, the second hour, ... the nth hour. The tilt angle change value output by the k-th tilt sensor at hour n is calculated as follows: x-direction: — The change value of the tilt component in the x-direction of the k-th tilt sensor in the n-th hour, n=1,2,3,...,8,k=1,2; —The tilt angle measurement value of the k-th tilt sensor in the x-direction at time i; y direction: —The change value of the tilt component in the y-direction of the k-th tilt sensor at the n-th hour, k = 1, 2; —The tilt angle measurement value of the k-th tilt sensor in the y-direction at time i; The combined tilt angle change value output by the k-th tilt sensor at hour n. The total tilt change output by the two tilt sensors within the same time period: The method for calculating tilt stability S is as follows: —The average value over the observation period by the tilt sensor.

9. The evaluation method for a precision testing environment of an ultra-high precision fiber optic gyroscope as described in any one of claims 1-8, characterized in that, Fourier transform was performed on the obtained fiber optic gyroscope test data to achieve spectrum analysis, and environmental assessment was conducted based on the changing trends of the spectrum.

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