CN116086425A - Interference type optical fiber gyro based on special mirror image ring structure - Google Patents
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- G01C19/00—Gyroscopes; Turn-sensitive devices using vibrating masses; Turn-sensitive devices without moving masses; Measuring angular rate using gyroscopic effects
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Abstract
The application provides an interference type fiber optic gyroscope based on a special mirror image ring structure, which comprises the following components: the device comprises a light source, a polarizer, a coupler, two circulators, two Y waveguides, a signal generator, a 2-in 2-out mirror image optical fiber ring, two photoelectric detectors and a signal joint demodulation module; wherein, two equal length polarization maintaining optical fibers of the mirror image optical fiber ring of coiling 2 in 2 out are all welded at the middle point of the optical fiber ring by 90 degrees with the fast axis, and one end of each polarization maintaining optical fiber is welded by 0 degrees with the fast axis when being welded with the Y waveguide tail optical fiber, and the other end is welded by 90 degrees with the fast axis. According to the fiber-optic gyroscope, light is not fed into two polarized channels of the same fiber-optic ring through the polarized beam splitting and combining device, but is welded with the two space mirror image fiber-optic rings through the two Y waveguides according to 0 degree and 90 degrees, so that radial magnetic field phase errors caused by Faraday effects are restrained, electric signals of the two photoelectric detectors are demodulated in a combined mode, and temperature phase error compensation caused by Shupe effects can be achieved.
Description
Technical Field
The application relates to the technical field of gyroscopes, in particular to an interference type fiber optic gyroscope based on a special mirror image ring structure.
Background
The optical fiber gyro is a sensitive angular rate optical fiber sensor, and can be divided into an interference type and a resonance type according to the working principle, wherein the interference type optical fiber gyro is used as a relatively mature representative in the optical fiber gyro technology, and has extremely wide application in application scenes such as navigation guidance, attitude control and the like, and the optical fiber gyro is hereinafter referred to as an interference type optical fiber gyro.
An interferometric fiber-optic gyroscope is a fiber-optic ring interferometer based on the Sagnac effect (Sagnac effect), which describes that when the fiber rotates around a sensitive axis, the phase difference created between two coherent light beams propagating in opposite directions in the ring is proportional to the rotational angular velocity. The fiber-optic gyroscope performance parameters mainly include zero Bias Instability (BI) and Angle Random Walk (ARW). Zero-bias instability is defined as the deviation of the output angular rate from the actual rotation angular rate, usually caused by environmental changes and polarization nonreciprocal errors. The angle random walk describes the short-time white noise in the gyro output, and the main sources are thermal noise, photon shot noise and light source relative intensity noise. The temperature and the magnetic field have larger influence on the performance parameters of the fiber optic gyroscope.
In the working process of the fiber-optic gyroscope, the refractive index of a corresponding point on the fiber-optic ring also changes along with the temperature change due to the change of the external temperature along with the time change, so that the time for two light waves which are transmitted in opposite directions to pass through the point is different (except for the middle point of the fiber-optic ring), and the phase change caused by the temperature after the two light waves pass through the fiber-optic ring is also different, which is equivalent to introducing an additional phase difference on the basis of Sagnac phase shift. This effect is known as the Shupe effect. In order to ensure the temperature stability of the fiber optic gyroscope, the temperature change rate of each symmetrical point of the relative middle point in the fiber optic ring is the same, the four-stage symmetrical winding method is the most commonly used fiber optic ring winding method at present, and the influence of temperature change on the nonreciprocity of the fiber optic can be well reduced in ideal cases, but the influence of the temperature gradient in the fiber optic ring cannot be completely eliminated by the four-stage symmetrical winding, and the longer the fiber optic length is, the more obvious the influence is caused by the residual effect.
When the fiber-optic gyroscope works in a magnetic field environment, the fiber-optic gyroscope can generate magnetic field phase errors in the magnetic field environment due to magneto-optical effect in the optical fiber. Magnetic field phase error is one of the main sources of error for fiber optic gyroscopes. The magnetic field phase error of the fiber optic gyroscope is mainly generated by radial magnetic field phase error perpendicular to the sensitive axis of the fiber optic ring by Faraday effect, wherein when a beam of linear polarized light passes through the fiber optic, if magnetic field components exist in the light propagation direction, the polarization plane of the light is rotated by an angle after the light passes through the material, and the effect introduces additional phase difference. The magnetic field phase error will be an unavoidable factor affecting the accuracy of the fiber optic gyroscope.
Along with the increasing application requirements of the optical fiber gyro with the increasing precision in the complex environment in recent years, how to overcome the limitation of temperature and magnetic field on the performance of the optical fiber gyro at the same time becomes a great challenge in the research process of the optical fiber gyro.
Disclosure of Invention
It is an object of the present invention to provide an interferometric fiber-optic gyroscope based on a special mirror ring structure that addresses at least one of the above-mentioned drawbacks of the prior interferometric fiber-optic gyroscopes.
The embodiment of the application provides an interference type optical fiber gyro based on a special mirror image ring structure, which comprises the following components:
the device comprises a light source, a polarizer, a coupler, two circulators, two Y waveguides, a signal generator, a 2-in 2-out mirror image optical fiber ring, two photoelectric detectors and a signal joint demodulation module;
wherein, two equal-length polarization maintaining optical fibers wound with 2-in 2-out mirror image optical fiber rings are welded at the middle point of the two equal-length polarization maintaining optical fibers by 90 degrees, and one end of each polarization maintaining optical fiber is welded by 0 degrees while the other end of each polarization maintaining optical fiber is welded by 90 degrees with the Y waveguide tail optical fiber;
the light source outputs light with any polarization state to the polarizer;
the polarizer converts light in any polarization state output by the light source into linearly polarized light;
the coupler is used for dividing linearly polarized light output by the polarizer into two paths of light beams on average and coupling the two paths of light beams to the first circulator and the second circulator respectively;
the first circulator outputs a first path of light beam output by the coupler to a first Y waveguide; the second circulator outputs a second path of light beam output by the coupler to a second Y waveguide;
the signal generator provides modulation signals to the two Y waveguides;
the first Y waveguide polarizes, couples and modulates the light beam output by the first circulator and outputs the light beam to the corresponding port of the 2-in 2-out mirror image optical fiber ring, and the second Y waveguide polarizes, couples and modulates the light beam output by the second circulator and outputs the light beam to the corresponding port of the 2-in 2-out mirror image optical fiber ring;
the light beams output by the two Y waveguides are respectively and independently interfered in the 2-in 2-out mirror image optical fiber rings to obtain a first interference signal and a second interference signal;
the first Y-waveguide outputting the first interference signal to the first circulator; the second Y-waveguide outputting the second interference signal to the second circulator;
the two circulators respectively output interference signals returned by the two Y waveguides to the two photoelectric detectors;
the two photoelectric detectors respectively convert interference signals output by the two circulators into electric signals and output the electric signals to the signal joint demodulation module;
and the signal joint demodulation module performs joint demodulation on two paths of electric signals output by the two photoelectric detectors.
In a possible implementation, the signal generator provides the two Y waveguides with modulated signals of equal amplitude and opposite phase.
In a possible implementation, the signal generator provides the two Y waveguides with modulated signals of equal amplitude and equal phase.
In one possible implementation, the circulator employs a single mode circulator.
In one possible implementation, the circulator employs a polarization-preserving circulator.
In one possible implementation, two of the Y waveguides perform similarly and have a high extinction ratio.
In a possible implementation manner, the 2-in 2-out mirror image optical fiber ring is manufactured by winding two equal-length polarization maintaining optical fibers on the same skeleton or on left and right partitions of the skeleton in a crossed manner according to opposite directions and arrangement sequences by adopting a four-stage symmetrical winding method, so that the two equivalent optical fiber rings are in mirror image relationship.
In a possible implementation manner, the signal joint demodulation module adopts an open-loop fiber-optic gyroscope multi-harmonic demodulation method.
In a possible implementation, the light source is a laser light source or an ASE light source.
This application compares with prior art's advantage lies in:
the interference type fiber optic gyroscope based on the special mirror image ring structure uses a 2-in and 2-out mirror image fiber optic ring to replace the fiber optic ring in the existing dual-polarization fiber optic gyroscope, the 2-in and 2-out mirror image fiber optic ring can be equivalent to two independent fiber optic rings but with space mirror images, and fast shafts at the middle points of the two fiber optic rings are welded according to 90 degrees. And cancel two polarization beam splitters and beam combiners, the light is not sent into two polarized channels of the same optical fiber ring through the polarization beam splitters and beam combiners, but welded with two space mirror image optical fiber rings through two Y waveguides according to 0 degree and 90 degrees respectively, thus inhibit radial magnetic field phase error caused by Faraday effect, carry on the joint demodulation to the electric signal of two photoelectric detectors, can realize the temperature phase error compensation caused by Shupe effect.
Drawings
Various other advantages and benefits will become apparent to those of ordinary skill in the art upon reading the following detailed description of the preferred embodiments. The drawings are only for purposes of illustrating the preferred embodiments and are not to be construed as limiting the application. Also, like reference numerals are used to designate like parts throughout the figures. In the drawings:
FIG. 1 is a schematic diagram of a prior art interferometric fiber optic gyroscope;
FIG. 2 is a schematic diagram of an interferometric fiber optic gyroscope based on a special mirror ring structure provided herein;
FIG. 3 shows a schematic diagram of polarization maintaining fiber butt fusion;
FIG. 4 shows a flow chart for compensating temperature noise for joint demodulation;
FIG. 5 shows one of the output angular velocity data analysis versus graphs using one of the fiber optic gyroscopes of the present application;
FIG. 6 shows a second comparison of the output angular velocity data analysis using one of the fiber optic gyroscopes of the present application.
Detailed Description
Hereinafter, embodiments of the present application will be described with reference to the accompanying drawings. It should be understood that the description is only exemplary and is not intended to limit the scope of the present application. In addition, in the following description, descriptions of well-known structures and techniques are omitted so as not to unnecessarily obscure the concepts of the present application.
Various structural schematic diagrams according to embodiments of the present application are shown in the accompanying drawings. The figures are not drawn to scale, wherein certain details are exaggerated for clarity of presentation and may have been omitted. The shapes of the various regions, layers and relative sizes, positional relationships between them shown in the drawings are merely exemplary, may in practice deviate due to manufacturing tolerances or technical limitations, and one skilled in the art may additionally design regions/layers having different shapes, sizes, relative positions as actually required.
FIG. 1 shows a schematic diagram of a prior art dual-polarization interferometric fiber-optic gyroscope. As shown in fig. 1, a conventional dual-polarization interference type fiber-optic gyroscope generally includes a light source, a polarizer, a coupler, two circulators (circulator 1 and circulator 2), two Y waveguides (Y waveguide 1 and Y waveguide 2), a signal generator, two polarization beam splitters and combiners (polarization beam splitter and combiners 1 and 2), two photodetectors (photodetector 1 and photodetector 2), and a fiber-optic ring.
The dual-polarization interference type fiber-optic gyroscope structure shown in fig. 1 cannot overcome the limitation of temperature and magnetic field on the performance of the fiber-optic gyroscope, so that the improvement of the precision of the fiber-optic gyroscope in a complex environment is restricted. In order to solve the current situation, the embodiment of the application provides an interference type fiber optic gyroscope based on a special mirror image ring structure, and the open-loop fiber optic gyroscope after the scheme is adopted can realize temperature phase error compensation caused by a Shupe effect by jointly processing fiber optic gyroscope output data formed by 2-in and 2-out mirror image fiber optic rings while inhibiting magnetic field phase error.
FIG. 2 is a schematic diagram of an interferometric fiber-optic gyroscope based on a special mirror ring structure according to the present application, as shown in FIG. 2, where the interferometric fiber-optic gyroscope based on a special mirror ring structure according to the present application includes: the light source 10, the polarizer 20, the coupler 30, two circulators (circulator 41, circulator 42), two Y waveguides (Y waveguide 51, Y waveguide 52), the signal generator 60, the 2-in 2-out mirror image fiber ring 70, two photodetectors (photodetector 81, photodetector 82) and the signal joint demodulation module 90. The Y-waveguide refers to an integrated optical multifunction optical waveguide modulator.
In this embodiment, the coupler 30 is a polarization maintaining coupler. The circulators 41, 42 may be three-port circulators.
In this embodiment, the 2 in and 2 out mirror image optical fiber ring 70 is made by winding two equal length polarization maintaining optical fibers on the same skeleton or on the left and right partitions of the skeleton in opposite directions and arrangement order by adopting a four-stage symmetrical winding method, so that the two equivalent optical fiber rings are in mirror image relationship, and the winding method can also ensure the mirror image relationship of the two equivalent optical fiber rings. The fast axis is welded at 90 degrees at the middle point of the wound two equal-length polarization-maintaining optical fibers.
One Y waveguide corresponds to one of the 2 in and 2 out mirror image fiber rings 70, and when each polarization maintaining fiber is fused with the Y waveguide pigtail, one end of each polarization maintaining fiber is fused with the Y waveguide pigtail in a fast axis 0 degree, and the other end of each polarization maintaining fiber is fused with the Y waveguide pigtail in a fast axis 90 degree, as shown in fig. 2, the first Y waveguide 51 is connected with one of the 2 in and 2 out mirror image fiber rings 70, and the second Y waveguide 52 is connected with the other of the 2 in and 2 out mirror image fiber rings 70. FIG. 3 is a schematic illustration of polarization maintaining fiber fusion-splicing.
In the interference type fiber optic gyroscope based on the special mirror image ring structure, light emitted by a light source is filtered by a polarizer and then is output to linearly polarized light, the linearly polarized light is divided into two paths with balanced power by a polarization maintaining coupler, interference is respectively generated in the fiber optic ring by a circulator and a Y waveguide, interference signals are output, the interference signals are respectively connected into a photoelectric detector, and the two paths of signals detected by the photoelectric detector are jointly demodulated.
The above-described interferometric fiber optic gyroscope based on a special mirror ring structure is described in detail below in conjunction with FIG. 2.
As shown in fig. 2, the light source 10 outputs light of an arbitrary polarization state to the polarizer 20. Specifically, the light source 10 may be a laser light source or an ASE light source. The ASE light source (Amplified Spontaneous Emission, amplified spontaneous emission light source) is a broad spectrum light source based on erbium-doped fiber amplified spontaneous emission.
The polarizer 20 converts light of an arbitrary polarization state output from the light source 10 into linearly polarized light, and the coupler 30 equally divides the linearly polarized light output from the polarizer 20 into two light beams and couples the two light beams to the first circulator 41 and the second circulator 42, respectively. Specifically, the two circulators can use a single-mode circulator or a polarization-maintaining circulator, and the polarization-maintaining circulator has a better effect of inhibiting polarization nonreciprocal errors.
The first circulator 41 outputs the first path of light beam output from the coupler 30 to the first Y waveguide 51; the second circulator 42 outputs the second path of the light beam output from the coupler 30 to a second Y waveguide 52. In particular, the two Y waveguides here should have similar properties and a high extinction ratio. For example, the insertion loss and polarization crosstalk of two Y-waveguide integrated optics are the same or similar as the main performance parameters.
The signal generator 60 provides modulated signals to the two Y waveguides (51, 52), and the amplitude and the phase of the modulated signals provided by the signal generator to the two Y waveguides are equal and can be the same or opposite.
Specifically, when the modulation signals provided by the signal generator for the two Y waveguides are identical, the signals are subjected to differential operation to obtain output signals after noise compensation; when the phases of the modulation signals provided by the signal generator for the two Y waveguides are opposite, the signals are summed to obtain a noise compensated output signal.
The first Y waveguide 51 polarizes, couples, modulates and outputs the light beam output from the first circulator 41 to the corresponding port of the 2 in 2 out mirror image optical fiber ring 70, and the second Y waveguide 52 polarizes, couples and modulates the light beam output from the second circulator 42 to the corresponding port of the 2 in 2 out mirror image optical fiber ring 70.
The beams output by the two Y waveguides interfere independently in the 2-in and 2-out mirror image fiber loops 70, respectively, to obtain a first interference signal and a second interference signal. The first Y waveguide 51 outputs the first interference signal to the first circulator 41; the second Y-waveguide 52 outputs a second interference signal to the second circulator 42.
The specific process of transmitting and interfering two polarized light beams in opposite directions through two orthogonal axes of the optical fiber ring and outputting the two polarized light beams is as follows:
the linearly polarized light output by the two Y waveguides is respectively connected into the fast axes of the two optical fiber rings in the 2-in and 2-out mirror image optical fiber rings, the clockwise linearly polarized light starts from one end of the Y waveguide, the melting point of the fast axis included angle is 0 degrees, the distance between the clockwise linearly polarized light and the midpoint of the optical fiber ring is L1, the linear polarized light changes the polarization direction to propagate along the slow axis after passing through the melting point of the fast axis included angle of 90 degrees, the distance between the linearly polarized light and the other end of the Y waveguide is L2, and the polarization direction is changed to propagate along the fast axis after passing through the melting point of the fast axis included angle of 90 degrees. The counter-clockwise linearly polarized light starts from the other end of the Y waveguide, changes the polarization direction into a slow axis through a melting point with a fast axis included angle of 90 degrees, propagates to the middle point of the optical fiber ring, changes the polarization direction into a state of propagating along the fast axis through a melting point with a fast axis included angle of 90 degrees, returns to the other end of the Y waveguide, changes the polarization direction into a state of L2 through a melting point with a fast axis included angle of 0 degrees, and does not change the polarization direction. Two beams of light propagating in opposite directions work in the same polarization direction at any position in the optical fiber ring and interfere.
The radial magnetic field errors corresponding to the fast axis and the slow axis can be expressed as respectively
Other parameters are consistent, the length of the tail fiber of the optical fiber is ignored, L 1 ＝L 2 According to the above-mentioned publicationThe radial magnetic field errors corresponding to the fast axis and the slow axis are compensated after superposition in the equations (1) and (2).
The photoelectric detector 81 is connected to the first circulator 41, the photoelectric detector 82 is connected to the second circulator 42, and the two circulators output interference signals returned by the two Y waveguides to the two photoelectric detectors respectively; the two photodetectors respectively convert the interference signals output by the two circulators into electrical signals, and output the electrical signals to the signal joint demodulation module 90.
The signal joint demodulation module 90 performs joint demodulation on two paths of electric signals output by the two photodetectors. Specifically, the signal joint demodulation module 90 performs joint demodulation on two paths of electrical signals output by two photodetectors by using an open-loop fiber optic gyroscope multi-harmonic demodulation method. Fig. 4 is a flow chart of joint demodulation compensation temperature noise in the 2-in 2-out mirror image fiber-optic ring fiber-optic gyroscope, and the detailed process is not repeated here.
The temperature phase error caused by the Shupe effect is respectively as follows when the fiber optic gyroscope formed by two fiber optic rings is subjected to in-phase modulation:
Δφ 1 ＝φ S +φ s upe formula (3);
Δφ 2 ＝-φ S +φ s upe formula (4);
after differential compensation:
Δφ sub ＝Δφ 1 -Δφ 2 ＝2φ S equation (5);
wherein phi is S Representing the Sagnac phase on one of the 2 in 2 out mirrored fiber rings,
φ s upe indicating the temperature phase error caused by the Shupe effect.
Similarly, the temperature phase error caused by the Shupe effect is respectively as follows when the fiber optic gyroscope formed by two fiber optic rings is subjected to opposite phase modulation:
Δφ 1 ＝φ S +φ supe equation (6);
Δφ 2 ＝φ S -φ supe equation (7);
after summation compensation:
Δφ sum ＝Δφ 1 +Δφ 2 ＝2φ S equation (8);
it can be seen that the temperature phase error caused by the Shupe effect is compensated.
The open-loop fiber optic gyroscope is built by taking the following devices as an example: an ASE light source with a wavelength of 1550nm and a spectrum width of 40nm is adopted, the length of a 2-in and 2-out optical fiber ring of an optical fiber gyro is 2km, the diameter is 148mm, the modulation frequency is 50kHz, and the modulation depth is 1.84.
The open loop fiber optic gyroscope was read for one hour to output angular velocity data for analysis by the Allan variance method and comparison with the results after relative intensity noise suppression (as shown in FIG. 5, where SUM represents the relative intensity noise suppression results) and with self noise (as shown in FIG. 6).
The error analysis and comparison results (fig. 5 and 6) of the angular velocity data output by the open-loop fiber optic gyroscope show that the two photodetectors PD1 and PD2 almost coincide, which indicates that the two-port output has strong correlation, and the short-time performance and the long-time performance of the fiber optic gyroscope are obviously improved after the scheme is applied.
The interference type fiber optic gyroscope based on the special mirror image ring structure uses a 2-in and 2-out mirror image fiber optic ring to replace the fiber optic ring in the existing dual-polarization fiber optic gyroscope, the 2-in and 2-out mirror image fiber optic ring can be equivalent to two independent fiber optic rings but with space mirror images, and fast shafts at the middle points of the two fiber optic rings are welded according to 90 degrees. And cancel two polarization beam splitters and beam combiners, the light is not sent into two polarized channels of the same optical fiber ring through the polarization beam splitters and beam combiners, but welded with two space mirror image optical fiber rings through two Y waveguides according to 0 degree and 90 degrees respectively, thus inhibit radial magnetic field phase error caused by Faraday effect, carry on the joint demodulation to the electric signal of two photoelectric detectors, can realize the temperature phase error compensation caused by Shupe effect.
To form the same structure, the person skilled in the art can also devise methods which are not exactly the same as those described above. In addition, although the embodiments are described above separately, this does not mean that the measures in the embodiments cannot be used advantageously in combination.
The embodiments of the present application are described above. However, these examples are for illustrative purposes only and are not intended to limit the scope of the present application. The scope of the application is defined by the appended claims and equivalents thereof. Various alternatives and modifications can be made by those skilled in the art without departing from the scope of the present application, and such alternatives and modifications are intended to fall within the scope of the present application.
Claims (9)
1. An interferometric fiber-optic gyroscope based on a special mirror ring structure, comprising: the device comprises a light source, a polarizer, a coupler, two circulators, two Y waveguides, a signal generator, a 2-in 2-out mirror image optical fiber ring, two photoelectric detectors and a signal joint demodulation module;
wherein, two equal-length polarization maintaining optical fibers wound with 2-in 2-out mirror image optical fiber rings are welded at the middle point of the two equal-length polarization maintaining optical fibers by 90 degrees, and one end of each polarization maintaining optical fiber is welded by 0 degrees while the other end of each polarization maintaining optical fiber is welded by 90 degrees with the Y waveguide tail optical fiber;
the light source outputs light with any polarization state to the polarizer;
the polarizer converts light in any polarization state output by the light source into linearly polarized light;
the coupler is used for dividing linearly polarized light output by the polarizer into two paths of light beams on average and coupling the two paths of light beams to the first circulator and the second circulator respectively;
the first circulator outputs a first path of light beam output by the coupler to a first Y waveguide; the second circulator outputs a second path of light beam output by the coupler to a second Y waveguide;
the signal generator provides modulation signals to the two Y waveguides;
the first Y waveguide polarizes, couples and modulates the light beam output by the first circulator and outputs the light beam to the corresponding port of the 2-in 2-out mirror image optical fiber ring, and the second Y waveguide polarizes, couples and modulates the light beam output by the second circulator and outputs the light beam to the corresponding port of the 2-in 2-out mirror image optical fiber ring;
the light beams output by the two Y waveguides are respectively and independently interfered in the 2-in 2-out mirror image optical fiber rings to obtain a first interference signal and a second interference signal;
the first Y-waveguide outputting the first interference signal to the first circulator; the second Y-waveguide outputting the second interference signal to the second circulator;
the two circulators respectively output interference signals returned by the two Y waveguides to the two photoelectric detectors;
the two photoelectric detectors respectively convert interference signals output by the two circulators into electric signals and output the electric signals to the signal joint demodulation module;
and the signal joint demodulation module performs joint demodulation on two paths of electric signals output by the two photoelectric detectors.
2. The special mirror ring structure based interferometric fiber-optic gyroscope of claim 1, wherein the signal generator provides the two Y waveguides with modulated signals of equal magnitude and opposite phase.
3. The special mirror ring structure based interferometric fiber-optic gyroscope of claim 1, wherein the signal generator provides the two Y waveguides with modulated signals of equal amplitude and equal phase.
4. The interferometric fiber-optic gyroscope of claim 1, wherein the circulator is a single mode circulator.
5. The interferometric fiber-optic gyroscope of claim 1, wherein the circulator is a polarization maintaining circulator.
6. The special mirror ring structure based interferometric fiber optic gyroscope of claim 1, wherein the two Y waveguides are similar in performance and have a high extinction ratio.
7. The interference type fiber optic gyroscope based on the special mirror image ring structure according to claim 1, wherein the 2-in 2-out mirror image fiber optic rings are manufactured by winding two equal-length polarization maintaining fibers on the same skeleton or on left and right sections of the skeleton in a crossed manner according to opposite directions and arrangement sequences by adopting a four-stage symmetrical winding method, so that the two equivalent fiber optic rings are in mirror image relationship.
8. The interference type fiber optic gyroscope based on the special mirror image ring structure according to claim 1, wherein the signal joint demodulation module adopts an open-loop fiber optic gyroscope multi-harmonic demodulation method.
9. The special mirror ring structure based interferometric fiber optic gyroscope of claim 1, wherein the light source is a laser light source or an ASE light source.
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