CN112797971A - Differential fiber-optic gyroscope based on temperature drift suppression characteristic of double-core fiber - Google Patents
Differential fiber-optic gyroscope based on temperature drift suppression characteristic of double-core fiber Download PDFInfo
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- G01C—MEASURING DISTANCES, LEVELS OR BEARINGS; SURVEYING; NAVIGATION; GYROSCOPIC INSTRUMENTS; PHOTOGRAMMETRY OR VIDEOGRAMMETRY
- G01C19/00—Gyroscopes; Turn-sensitive devices using vibrating masses; Turn-sensitive devices without moving masses; Measuring angular rate using gyroscopic effects
- G01C19/58—Turn-sensitive devices without moving masses
- G01C19/64—Gyrometers using the Sagnac effect, i.e. rotation-induced shifts between counter-rotating electromagnetic beams
- G01C19/72—Gyrometers using the Sagnac effect, i.e. rotation-induced shifts between counter-rotating electromagnetic beams with counter-rotating light beams in a passive ring, e.g. fibre laser gyrometers
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Abstract
The invention discloses a differential fiber optic gyroscope based on a characteristic of inhibiting temperature drift of a double-core fiber. The main structure comprises two light sources with different wavelengths, two optical couplers, two Y-shaped multifunctional integrated optical devices, two fan-in fan-out modules, a double-core optical fiber ring, two optical detectors and a digital signal acquisition and processing circuit board. Light emitted by the two light sources is respectively guided to two different fiber cores in the double-core fiber ring by the fan-in fan-out module through the optical coupler and the Y-shaped multifunctional integrated optical device in respective optical paths and finally independently interfered, so that the method is equivalent to realizing two fiber-optic gyroscopes with the same time-varying temperature disturbance, and the environmental noise can be effectively inhibited by synchronously detecting and differentially processing interference signals. The method can obviously inhibit the influence of environmental disturbance on the precision of the fiber-optic gyroscope, basically eliminate errors caused by temperature effect and the like, and obtain the accurate angular velocity information of the carrier.
Description
Technical Field
The invention relates to the technical field of fiber optic gyroscopes, in particular to a differential fiber optic gyroscope based on the characteristic of inhibiting temperature drift of a double-core fiber.
Background
The fiber-optic gyroscope is one of the most important achievements in the field of fiber-optic sensing, and plays an important role in an inertial navigation system because of the advantages of small volume, light weight, large dynamic range, high sensitivity and the like. The performance of the fiber-optic gyroscope is affected by the surrounding environment such as radiation, magnetic field, vibration, temperature, etc. besides the accuracy of the fiber-optic gyroscope itself, and these factors all cause the degradation of the measurement accuracy.
Temperature effects generally have the greatest effect on the gyroscope. In engineering application, in order to improve the sensitivity of the fiber-optic gyroscope, optical fibers of hundreds of meters to thousands of meters are often wound into a multi-turn coil, however, because of time-varying temperature disturbance of the optical fibers, two beams of counter-propagating light waves can also experience different phase shifts when passing through each section of optical fiber at different times, namely, the Shupe effect. The Shupe effect will produce large bias errors in the fiber optic gyroscope.
The error caused by temperature factor is random and hard to describe, the current solution mainly utilizes two lights with different wavelengths to propagate in a single sensitive coil except for utilizing advanced coil winding technology, adopting heat insulation treatment, performing temperature modeling compensation on a gyroscope and the like, and eliminates the influence of temperature effect through difference when synchronous processing is performed on angular velocity information. However, for light beams with different wavelengths, if the wavelength difference is small, mutual interference may be generated in the optical path, and if the wavelength difference is large, since the optical devices all have specific operating wavelengths, it is difficult to transmit the two lights at the same time in high quality, which finally affects the improvement of the performance of the gyroscope.
Disclosure of Invention
In order to reduce the influence of environmental factors on the performance of the optical fiber gyroscope, the invention provides the differential optical fiber gyroscope based on the characteristic of inhibiting the temperature drift of the double-core optical fiber.
The technical scheme of the invention is as follows: a differential fiber-optic gyroscope based on a characteristic of inhibiting temperature drift of a double-core fiber comprises a first light source, a second light source, a first optical coupler, a second optical coupler, a first Y-shaped multifunctional integrated optical device, a second Y-shaped multifunctional integrated optical device, a first fan-in fan-out module, a second fan-in fan-out module, a double-core fiber-optic ring, a first optical detector, a second optical detector and a digital signal acquisition processing circuit board;
two fiber core both ends ports in the double-core optical fiber ring cladding are respectively: the port A and the port C, the port B and the port D are connected with the first fan-in fan-out module, and the port C and the port D are connected with the second fan-in fan-out module; light emitted by a first light source is divided into two beams after passing through a first optical coupler and a first Y-shaped multifunctional integrated optical device, one beam enters an A port from a first fan-in output module, the other beam enters a C port from a second fan-in fan-out module, returns to the first Y-shaped multifunctional integrated optical device after passing through a current fiber core in a double-core optical fiber ring and is recombined into one path of light, and interference light information is finally converted into an electric signal by a first optical detector; the second light source passes through a second optical coupler, a second Y-shaped multifunctional integrated optical device, a first fan-in output module, a second fan-in fan-out module, a port B, a port D and a double-core optical fiber ring on the other light path, and corresponding interference light information is converted into an electric signal by a second optical detector; the electric signals generated by the first optical detector and the second optical detector enter the digital signal acquisition processing circuit board to demodulate rotating speed information corresponding to the two optical paths, on one hand, the rotating speed information is used for gyro output after difference is carried out, on the other hand, corresponding modulation voltages are respectively generated and loaded on the first Y-shaped multifunctional integrated optical device and the second Y-shaped multifunctional integrated optical device to realize closed-loop feedback and bias modulation.
The first light source and the second light source respectively adopt SLD light sources with the wavelengths of 1530nm and 1560nm and the spectral width of 30 nm. Two fiber cores in the double-core optical fiber ring are symmetrically distributed relative to the central line of the optical fiber, and the length of the optical fiber ring is 3240m, and the diameter of the optical fiber ring is 12.5 cm.
The digital signal acquisition and processing circuit board comprises a double-path analog-to-digital converter, a digital signal processing chip and a double-path digital-to-analog converter, and realizes synchronous processing of double-path interference signals; because the fiber core temperature, the stress characteristics and the like at the same position in the double-core optical fiber can be approximately the same, the two paths of rotating speed information at the same moment are subjected to differential processing, so that the nonreciprocal phase error caused by the environment can be offset, the drift caused by the factors such as the temperature is reduced to the minimum or even completely eliminated, and the environmental adaptability of the optical fiber gyroscope is improved to the great extent.
Compared with the prior art, the invention has the beneficial effects that:
the invention adopts a double-path structure, and two beams of light with different wavelengths are transmitted in different fiber cores of the same double-core optical fiber ring, so that two optical fiber gyroscope systems are equivalently realized. Because the two fiber cores are basically same in environmental factors, the temperature drift contained in the two interference signals is similar, the temperature effect and other environmental errors can be inhibited by carrying out differential calculation on the two interference signals in the digital signal processor, and the performance of the fiber-optic gyroscope is greatly improved.
Drawings
Fig. 1 is a differential fiber optic gyroscope based on a two-core fiber temperature drift suppression characteristic.
The optical fiber signal processing device comprises a first light source 1, a second light source 2, a first optical coupler 3, a second optical coupler 4, a first Y-shaped multifunctional integrated optical device 5, a second Y-shaped multifunctional integrated optical device 6, a first fan-in fan-out module 7, a second fan-in fan-out module 8, a double-core optical fiber ring 9, a first optical detector 10, a second optical detector 11 and a digital signal acquisition processing circuit board 12.
Detailed Description
The present invention will be described in detail below with reference to the accompanying drawings and specific examples, and is implemented on the premise of the technical solution of the present invention, but the scope of the present invention is not limited to the following examples.
Referring to fig. 1, a differential fiber-optic gyroscope based on a dual-core fiber temperature drift suppression characteristic specifically includes a first light source 1 with a wavelength of 1530nm, a second light source 2 with a wavelength of 1560nm, a first optical coupler 3, a second optical coupler 4, a first Y-shaped multifunctional integrated optical device 5, a second Y-shaped multifunctional integrated optical device 6, a first fan-in fan-out module 7, a second fan-in fan-out module 8, a dual-core fiber ring 9, a first optical detector 10, a second optical detector 11, and a digital signal acquisition processing circuit board 12.
The optical path connection mode and the light beam transmission process are as follows:
two fiber core both ends ports in the 9 peripherys of two core fiber ring are respectively: the port A and the port C, the port B and the port D are connected with the first fan-in fan-out module 7, and the port C and the port D are connected with the second fan-in fan-out module 8; light emitted by a first light source 1 is divided into two beams after passing through a first optical coupler 3 and a first Y-shaped multifunctional integrated optical device 5, one beam enters an A port from a first fan-in output module 7, the other beam enters a C port from a second fan-in fan-out module 8, returns to the first Y-shaped multifunctional integrated optical device 5 after passing through a current fiber core in a double-core optical fiber ring 9 to be recombined into one beam, and interference light information is finally converted into an electric signal by a first optical detector 10; the second light source 2 also passes through a second optical coupler 4, a second Y-shaped multifunctional integrated optical device 6, a first fan-in output module 7, a second fan-in fan-out module 8, a B port, a D port and a double-core optical fiber ring 9 on the other optical path, and corresponding interference optical information is converted into an electric signal by a second optical detector 11.
The signal transmission process is as follows:
the electrical signals generated by the first optical detector 10 and the second optical detector 11 enter the digital signal acquisition processing circuit board 12 to demodulate the rotation speed information corresponding to the two optical paths, on one hand, the differential signals are used for gyro output, on the other hand, corresponding modulation voltages are respectively generated and loaded on the first Y-shaped multifunctional integrated optical device 5 and the second Y-shaped multifunctional integrated optical device 6 to realize closed-loop feedback and bias modulation; the process should be careful to avoid coupling crosstalk between the two circuits.
Wherein, the first light source 1 and the second light source 2 are SLD light sources with spectral widths of 30 nm; the double-core optical fiber ring 9 is a double-core polarization-maintaining optical fiber ring, two fiber cores are symmetrically distributed relative to the central line of the optical fiber, the length of the optical fiber ring is 3240m, and the diameter of the optical fiber ring is 12.5 cm; the digital signal acquisition processing circuit board 12 includes a two-way analog-to-digital converter, a digital signal processing chip, and a two-way digital-to-analog converter, and implements synchronous processing of two-way interference signals.
The invention adopts a double-path structure, and two beams of light with different wavelengths are transmitted in different fiber cores of the same double-core optical fiber ring, so that two optical fiber gyroscope systems are equivalently realized. Because the two fiber cores have basically the same environmental factors, the temperature drifts contained in the two interference signals are also similar, and the temperature effect and other environmental errors can be restrained to a great extent by carrying out differential calculation on the two interference signals in a digital signal processor, so that the performance of the fiber-optic gyroscope is greatly improved.
The above embodiments specifically disclose the present invention, and those skilled in the art can implement two fiber-optic gyroscopes with different operating wavelengths in the same dual-core fiber or multi-core fiber, equivalently, and eliminate equivalent transformation or modification of temperature effect by differentiating the two paths of angular velocity information without departing from the spirit and scope of the present invention, all of which shall be covered by the protection scope of the present invention.
Claims (4)
1. A differential fiber-optic gyroscope based on a characteristic of inhibiting temperature drift of a double-core fiber is characterized by comprising a first light source (1), a second light source (2), a first optical coupler (3), a second optical coupler (4), a first Y-shaped multifunctional integrated optical device (5), a second Y-shaped multifunctional integrated optical device (6), a first fan-in fan-out module (7), a second fan-in fan-out module (8), a double-core fiber-optic ring (9), a first optical detector (10), a second optical detector (11) and a digital signal acquisition processing circuit board (12);
two fiber core both ends ports in the double-core optical fiber ring (9) cladding are respectively: the A port and the C port, the B port and the D port are connected with a first fan-in fan-out module (7), and the C port and the D port are connected with a second fan-in fan-out module (8); light emitted by a first light source (1) is divided into two beams after passing through a first optical coupler (3) and a first Y-shaped multifunctional integrated optical device (5), one beam enters an A port from a first fan-in output module (7), the other beam enters a C port from a second fan-in fan-out module (8), returns to the first Y-shaped multifunctional integrated optical device (5) to be recombined into one path of light after passing through a current fiber core in a double-core optical fiber ring (9), and interference light information is finally converted into an electric signal by a first optical detector (10); the second light source (2) also passes through a second optical coupler (4), a second Y-shaped multifunctional integrated optical device (6), a first fan-in output module (7), a second fan-in fan-out module (8), a port B, a port D and a double-core optical fiber ring (9) on the other light path, and corresponding interference light information is converted into an electric signal by a second optical detector (11); electric signals generated by the first optical detector (10) and the second optical detector (11) enter the digital signal acquisition processing circuit board (12) to demodulate rotating speed information corresponding to the two optical paths, on one hand, the rotating speed information is used for gyro output after difference is carried out, on the other hand, corresponding modulation voltages are respectively generated and loaded on the first Y-shaped multifunctional integrated optical device (5) and the second Y-shaped multifunctional integrated optical device (6) to realize closed-loop feedback and bias modulation.
2. The differential fiber optic gyroscope with the temperature drift suppression characteristic based on the dual-core optical fiber as claimed in claim 1, wherein the first light source (1) and the second light source (2) respectively adopt SLD light sources with the wavelengths of 1530nm and 1560nm and the spectral width of 30 nm.
3. The differential fiber-optic gyroscope with the characteristic of inhibiting the temperature drift based on the dual-core fiber as claimed in claim 1, wherein the dual-core fiber-optic ring (9) is a dual-core polarization maintaining fiber-optic ring, two fiber cores are symmetrically distributed relative to the central line of the fiber, the length of the fiber-optic ring is 3240m, and the diameter of the fiber-optic ring is 12.5 cm.
4. The differential fiber-optic gyroscope with the dual-core fiber-optic temperature drift suppression characteristic as claimed in claim 1, wherein the digital signal acquisition processing circuit board (12) comprises a dual-path analog-to-digital converter, a digital signal processing chip and a dual-path digital-to-analog converter, and realizes synchronous processing of dual-path interference signals.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113532412A (en) * | 2021-07-05 | 2021-10-22 | 浙江大学 | Device for improving reciprocity of interference type optical fiber gyroscope |
| CN116045941A (en) * | 2022-11-29 | 2023-05-02 | 杭州友孚科技有限公司 | Interference type optical fiber gyro with double-ring structure |
| WO2024045451A1 (en) * | 2022-09-01 | 2024-03-07 | 中国船舶集团有限公司第七〇七研究所 | Fiber-optic gyroscope based on mode division multiplexing and precision improvement method therefor |
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| Publication number | Priority date | Publication date | Assignee | Title |
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