CN108168537B - Detection system and method of resonant optical gyroscope based on orthogonal demodulation - Google Patents
Detection system and method of resonant optical gyroscope based on orthogonal demodulation 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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- G—PHYSICS
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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 resonant optical gyro detection system and method based on orthogonal demodulation. Firstly, carrying out phase modulation on laser input into an optical ring-shaped resonant cavity, and carrying out synchronous orthogonal demodulation on clockwise and anticlockwise output signals out of the cavity, wherein one path of orthogonal demodulation signal is used as an error signal after signal processing to control the frequency of a laser through a servo loop, so that the output optical frequency of the laser is tracked and locked on the path of resonant frequency; and the other path of orthogonal demodulation signal is output as a gyro signal after signal processing. The detection method of the resonant optical gyroscope provided by the invention is beneficial to automatically adjusting the demodulation phase to the maximum sensitivity point; phase noise of devices in a system loop is suppressed, and the signal-to-noise ratio of the system is improved.
Description
Technical Field
The invention relates to the technical field of signal detection, in particular to a detection system and a detection method of a resonant optical gyroscope with orthogonal demodulation. The resonant gyroscope comprises a resonant fiber optic gyroscope taking a fiber ring resonant cavity as a sensitive element and a resonant integrated optical gyroscope taking an optical waveguide resonant cavity as a core sensitive element.
Background
A Resonant Optical Gyro (ROG) is a high-precision miniature inertial sensor that uses the optical Sagnac effect to detect rotation. The resonant optical gyro without vibration part has the advantages of small size, high precision, vibration resistance, etc. ROG will have a greater advantage than Micro Electro Mechanical Systems (MEMS) and Interferometric Fiber Optic Gyroscope (IFOG).
Since the Sagnac effect is a very weak effect and the optical noise of the resonant optical gyroscope is very strong, signal modulation and detection and noise suppression techniques are very important in the resonant optical gyroscope system. When the system signal is demodulated, the phase needs to be manually adjusted to maximize the sensitivity of the system, which is not favorable for the industrial production of the gyro system. And the instrumentation in the system presents phase noise that can affect the output of the gyroscope.
Disclosure of Invention
The invention aims to provide a resonant optical gyro detection system and method based on quadrature demodulation, aiming at the defects of the prior art.
The purpose of the invention is realized by the following technical scheme:
a resonant optical gyro detection system based on orthogonal demodulation comprises an optical system consisting of a tunable laser, an optical isolator, an optical splitter, a first phase modulator, a second phase modulator, an optical resonant cavity and a photoelectric conversion module, and a signal processing system consisting of a signal modulation and demodulation module, a feedback locking module, a first signal processing module and a second signal processing module;
the tunable laser, the optical isolator and the optical branching unit are sequentially connected, the optical branching unit is respectively connected with a first phase modulator and a second phase modulator, the first phase modulator is connected with the optical resonant cavity, the second phase modulator is connected with the optical resonant cavity, the optical resonant cavity and the photoelectric conversion module are sequentially connected with a signal modulation and demodulation module, the signal modulation and demodulation module is connected with a first phase modulation module, the signal modulation and demodulation module is connected with a second phase modulation module, the signal modulation and demodulation module, a first signal processing module and a feedback locking module are sequentially connected with the tunable laser, and the signal modulation and demodulation module is connected with a second signal processing module.
The detection method of the detection system comprises the following steps:
(1) phase modulation: laser emitted by the tunable laser passes through the optical isolator, is divided into two beams with the same power by the optical splitter, and then passes through the first phase modulator and the second phase respectivelyThe modulator modulates, in particular: the signal modulation and demodulation module generates a carrier suppression modulation signal U1(t) and U2(t) driving the first phase modulator and the second phase modulator to perform phase modulation, respectively, thereby performing phase modulation and carrier suppression of counterclockwise and clockwise light entering the optical resonator;
(2) quadrature demodulation of signals: two beams of light after phase modulation are input into the optical resonant cavity to form two counterclockwise and clockwise resonant beams, the two beams of light respectively enter the photoelectric detector to be converted into electric signals, the signal modulation and demodulation module generates same-frequency orthogonal signals to respectively demodulate the electric signals converted from the clockwise beams, and a demodulation signal U is generated3(t) and U4(t); the signal modulation and demodulation module generates same-frequency orthogonal signals to respectively demodulate the electric signals converted from the anticlockwise light beams to generate demodulation signals U5(t) and U6(t)；
(3) Signal processing of quadrature demodulation signal: in the second signal processing module, two orthogonal demodulation signals U in the clockwise direction3(t) and U4(t) squaring and adding the signals, and then opening the root to obtain a non-negative even function signal U7(t) according to the positive and negative of one path of orthogonal demodulation signal, carrying out U7(t) flipping (which may be determined by a parameter setting of the system, e.g. U)3(t) is positive, let U7(t) is positive, U3When (t) is negative, let U7(t) is negative), and finally obtaining an odd function signal U8(t); in the first signal processing module, two paths of orthogonal demodulation signals U in the counterclockwise direction5(t) and U6(t) squaring and adding the signals, and then opening the root to obtain a non-negative even function signal U9(t) according to the positive and negative of one path of orthogonal demodulation signal, carrying out U9(t) flipping (which may be determined by a parameter setting of the system, e.g. U)5(t) is positive, let U9(t) is positive, U5When (t) is negative, let U9(t) is negative), and finally obtaining an odd function signal U10(t)；
(4) And (3) gyro signal output: the counter-clockwise signal is processed by the first signal processing module and then is transmitted to the feedback locking module as an error signal, and the feedback locking module performs proportional and integral operation processing on the counter-clockwise signal and then controls the tunable laser in a feedback mode; and the clockwise signal is processed by the second signal processing module and then is output to the data recorder as a resonant optical gyro signal.
A resonant optical gyro detection system based on quadrature demodulation is characterized by comprising an optical system consisting of a tunable laser, an optical isolator, an optical splitter, a first phase modulator, a second phase modulator, a third phase modulator, an optical resonant cavity and a photoelectric conversion module, and a signal processing system consisting of a signal modulation and demodulation module, a feedback locking module, a first signal processing module, a second signal processing module and a servo frequency shift module;
the tunable laser, the optical isolator and the optical branching unit are sequentially connected, the optical branching unit is respectively connected with the first phase modulator and the second phase modulator, the first phase modulator, the third phase modulator and the optical resonant cavity are sequentially connected, the second phase modulator is connected with the optical resonant cavity, the optical resonant cavity and the photoelectric conversion module are sequentially connected with the signal modulation and demodulation module, the signal modulation and demodulation module is connected with the first phase modulator, the signal modulation and demodulation module is connected with the second phase modulator, the signal modulation and demodulation module, the first signal processing module and the feedback locking module are sequentially connected with the tunable laser, and the signal modulation and demodulation module, the second signal processing module, the servo frequency shifting module and the third phase modulator are sequentially connected.
The detection method of the detection system comprises the following steps:
(1) phase modulation: laser emitted by a tunable laser passes through an optical isolator, is divided into two beams with the same power through an optical splitter, and then is modulated through a first phase modulator and a second phase modulator respectively, specifically: the signal modulation and demodulation module generates a carrier suppression modulation signal U1(t) and U2(t) driving the first phase modulator and the second phase modulator to perform phase modulation, respectively, thereby performing phase modulation and carrier suppression of counterclockwise and clockwise light entering the optical resonator；
(2) Quadrature demodulation of signals: inputting two beams of light subjected to phase modulation into an optical resonant cavity to form two counterclockwise and clockwise resonant light beams, and respectively entering a photoelectric detector to be converted into electric signals; the signal modulation and demodulation module generates common-frequency orthogonal signals to demodulate the electric signals converted from the clockwise light beams respectively to generate demodulation signals U3(t) and U4(t); the signal modulation and demodulation module generates same-frequency orthogonal signals to respectively demodulate the electric signals converted from the anticlockwise light beams to generate demodulation signals U5(t) and U6(t)；
(3) Signal processing of quadrature demodulation signal: in the second signal processing module, two orthogonal demodulation signals U in the clockwise direction3(t) and U4(t) squaring and adding the signals, and then opening the root to obtain a non-negative even function signal U7(t) according to the positive and negative of one path of orthogonal demodulation signal, carrying out U7(t) flipping (which may be determined by a parameter setting of the system, e.g. U)3(t) is positive, let U7(t) is positive, U3When (t) is negative, let U7(t) is negative), and finally obtaining an odd function signal U8(t); in the first signal processing module, two paths of orthogonal demodulation signals U in the counterclockwise direction5(t) and U6(t) squaring and adding the signals, and then opening the root to obtain a non-negative even function signal U9(t) according to the positive and negative of one path of orthogonal demodulation signal, carrying out U9(t) flipping (which may be determined by a parameter setting of the system, e.g. U)5(t) is positive, let U9(t) is positive, U5When (t) is negative, let U9(t) is negative), and finally obtaining an odd function signal U10(t)。
(4) And (3) gyro signal output: the counter-clockwise signal is transmitted to the feedback locking module as an error signal after passing through the first signal processing module, the feedback locking module performs proportional and integral operation on the counter-clockwise signal and then performs feedback control on the tunable laser, the clockwise signal is transmitted to the servo frequency shift module after passing through the second signal processing module and finally acts on the third phase modulator, so that the clockwise signal also works on a resonance frequency point, and the frequency shift quantity is a rotation output signal of the gyroscope.
The invention has the following beneficial effects:
1. the detection method of the resonant optical gyroscope provided by the invention is beneficial to automatically adjusting the demodulation phase to the point of maximum sensitivity.
2. The detection method of the resonant optical gyroscope provided by the invention inhibits the phase noise of the system device of the resonant optical gyroscope and improves the signal-to-noise ratio of the system.
3. The detection method of the resonant optical gyroscope provided by the invention can inhibit back scattered noise while inhibiting phase noise, and improves the stability of the system.
Drawings
Fig. 1 is a schematic structural diagram of a detection system of a first quadrature demodulation resonant optical gyro according to the present invention.
Fig. 2 is a schematic structural diagram of a detection system of a second quadrature demodulation resonant optical gyro according to the present invention.
Fig. 3 is a graph schematically showing the output of the orthogonal demodulation signal processing.
Fig. 4 is a schematic diagram of the relationship between the clockwise and counterclockwise resonant frequencies and the laser frequency when the resonant optical gyroscope rotates.
Fig. 5 is a schematic diagram of an embodiment of a resonant optical gyro detection system based on quadrature demodulation.
In the figure: 1. the device comprises a tunable laser, a 2, an isolator, a 3, an optical splitter, a 4, a first phase modulator 5, a second phase modulator, a 6, a first circulator, a 7, a second circulator, a 8, an optical resonant cavity, a 9, a first photoelectric detector, a 10, a second photoelectric detector, a 11, a signal modulation and demodulation module, a 12, a first signal processing module, a 13, a feedback locking module, a 14, a second signal processing module, a 15 and a data recorder.
Detailed Description
The present invention will be described in detail below with reference to examples and drawings, but the present invention is not limited thereto.
As shown in fig. 1, a detection system of a resonant optical gyroscope based on quadrature demodulation is characterized in that it includes an optical system composed of a tunable laser, an optical isolator, an optical splitter, a first phase modulator, a second phase modulator, an optical resonant cavity, and a photoelectric conversion module, and a signal processing system composed of a modulation and demodulation module of a signal, a feedback locking module, a first signal processing module, and a second signal processing module;
the tunable laser, the optical isolator and the optical branching unit are sequentially connected, the optical branching unit is respectively connected with a first phase modulator and a second phase modulator, the first phase modulator is connected with the optical resonant cavity, the second phase modulator is connected with the optical resonant cavity, the optical resonant cavity and the photoelectric conversion module are sequentially connected with a signal modulation and demodulation module, the signal modulation and demodulation module is connected with a first phase modulation module, the signal modulation and demodulation module is connected with a second phase modulation module, the signal modulation and demodulation module, a first signal processing module and a feedback locking module are sequentially connected with the tunable laser, and the signal modulation and demodulation module is connected with a second signal processing module.
The detection method of the detection system comprises the following steps:
(1) phase modulation: laser emitted by a tunable laser passes through an optical isolator, is divided into two beams with the same power through an optical splitter, and then is modulated through a first phase modulator and a second phase modulator respectively, specifically: the signal modulation and demodulation module generates a carrier suppression modulation signal U1(t) and U2(t) driving the first phase modulator and the second phase modulator to perform phase modulation, respectively, thereby performing phase modulation and carrier suppression of counterclockwise and clockwise light entering the optical resonator;
(2) quadrature demodulation of signals: two beams of light after phase modulation are input into the optical resonant cavity to form two counterclockwise and clockwise resonant beams, the two beams of light respectively enter the photoelectric detector to be converted into electric signals, the signal modulation and demodulation module generates same-frequency orthogonal signals to respectively demodulate the electric signals converted from the clockwise beams, and a demodulation signal U is generated3(t) and U4(t); the signal modulation-demodulation module generates the same-frequency orthogonal signal to respectively convert the anticlockwise light beamsThe electrical signal is demodulated to produce a demodulated signal U5(t) and U6(t)；
(3) Signal processing of quadrature demodulation signal: in the second signal processing module, two orthogonal demodulation signals U in the clockwise direction3(t) and U4(t) squaring and adding the signals, and then opening the root to obtain a non-negative even function signal U7(t) according to the positive and negative of one path of orthogonal demodulation signal, carrying out U7(t) flipping (which can be determined according to the system parameters, e.g., U in this embodiment)3(t) is positive, let U7(t) is positive, U3When (t) is negative, let U7(t) is negative), and finally obtaining an odd function signal U8(t); in the first signal processing module, two paths of orthogonal demodulation signals U in the counterclockwise direction5(t) and U6(t) squaring and adding the signals, and then opening the root to obtain a non-negative even function signal U9(t) according to the positive and negative of one path of orthogonal demodulation signal, carrying out U9(t) turning over, (which can be determined according to the parameter setting of the system, e.g., in this embodiment, U5(t) is positive, let U9(t) is positive, U5When (t) is negative, let U9(t) is negative), and finally obtaining an odd function signal U10(t)；
(4) And (3) gyro signal output: the counter-clockwise signal is processed by the first signal processing module and then is transmitted to the feedback locking module as an error signal, and the feedback locking module performs proportional and integral operation processing on the counter-clockwise signal and then controls the tunable laser in a feedback mode; and the clockwise signal is processed by the second signal processing module and then is output to the data recorder as a resonant optical gyro signal.
As shown in fig. 2, a detection system of a resonant optical gyroscope based on quadrature demodulation is characterized in that it includes an optical system composed of a tunable laser, an optical isolator, an optical splitter, a first phase modulator, a second phase modulator, a third phase modulator, an optical resonant cavity and a photoelectric conversion module, and a signal processing system composed of a signal modulation/demodulation module, a feedback locking module, a first signal processing module, a second signal processing module and a servo frequency shift module;
the tunable laser, the optical isolator and the optical branching unit are sequentially connected, the optical branching unit is respectively connected with the first phase modulator and the second phase modulator, the first phase modulator, the third phase modulator and the optical resonant cavity are sequentially connected, the second phase modulator is connected with the optical resonant cavity, the optical resonant cavity and the photoelectric conversion module are sequentially connected with the signal modulation and demodulation module, the signal modulation and demodulation module is connected with the first phase modulator, the signal modulation and demodulation module is connected with the second phase modulator, the signal modulation and demodulation module, the first signal processing module and the feedback locking module are sequentially connected with the tunable laser, and the signal modulation and demodulation module, the second signal processing module, the servo frequency shifting module and the third phase modulator are sequentially connected.
The detection method of the detection system comprises the following steps:
(1) phase modulation: laser emitted by a tunable laser passes through an optical isolator, is divided into two beams with the same power through an optical splitter, and then is modulated through a first phase modulator and a second phase modulator respectively, specifically: the signal modulation and demodulation module generates a carrier suppression modulation signal U1(t) and U2(t) driving the first phase modulator and the second phase modulator to perform phase modulation, respectively, thereby performing phase modulation and carrier suppression of counterclockwise and clockwise light entering the optical resonator;
(2) quadrature demodulation of signals: inputting two beams of light subjected to phase modulation into an optical resonant cavity to form two counterclockwise and clockwise resonant light beams, and respectively entering a photoelectric detector to be converted into electric signals; the signal modulation and demodulation module generates common-frequency orthogonal signals to demodulate the electric signals converted from the clockwise light beams respectively to generate demodulation signals U3(t) and U4(t); the signal modulation and demodulation module generates same-frequency orthogonal signals to respectively demodulate the electric signals converted from the anticlockwise light beams to generate demodulation signals U5(t) and U6(t)；
(3) Signal processing of quadrature demodulation signal: in the second signal processing module, two orthogonal demodulation signals U in the clockwise direction3(t) and U4(t) squaring and adding the signals, and then opening the root to obtain a non-negative even function signal U7(t) according to the positive and negative of one path of orthogonal demodulation signal, carrying out U7(t) flipping (which can be determined according to the system parameters, e.g., U in this embodiment)3(t) is positive, let U7(t) is positive, U3When (t) is negative, let U7(t) is negative), and finally obtaining an odd function signal U8(t); in the first signal processing module, two paths of orthogonal demodulation signals U in the counterclockwise direction5(t) and U6(t) squaring and adding the signals, and then opening the root to obtain a non-negative even function signal U9(t) according to the positive and negative of one path of orthogonal demodulation signal, carrying out U9(t) flipping (which can be determined according to the system parameters, e.g., U in this embodiment)5(t) is positive, let U9(t) is positive, U5When (t) is negative, let U9(t) is negative), and finally obtaining an odd function signal U10(t)。
(4) And (3) gyro signal output: the counter-clockwise signal is transmitted to the feedback locking module as an error signal after passing through the first signal processing module, the feedback locking module performs proportional and integral operation on the counter-clockwise signal and then performs feedback control on the tunable laser, the clockwise signal is transmitted to the servo frequency shift module after passing through the second signal processing module and finally acts on the third phase modulator, so that the clockwise signal also works on a resonance frequency point, and the frequency shift quantity is a rotation output signal of the gyroscope.
As shown in fig. 3, an output demodulation curve of the resonant optical gyro based on quadrature demodulation is given. The demodulation curve reflects the relationship between the resonant frequency difference and the demodulation amplitude. The middle linear region is the working range of the gyroscope, when the gyroscope rotates, a resonance frequency difference is generated, and the demodulation value is not 0. And calculating the rotation angular speed of the gyroscope according to the calibration coefficient.
As shown in fig. 4, a schematic diagram of the relationship between the clockwise and counterclockwise resonant frequencies and the laser frequency when the resonant optical gyroscope rotates is shown. The laser frequency is always stabilized at the resonance frequency of the anticlockwise light beam, and the resonance frequency difference of the clockwise light beam and the anticlockwise light beam is the rotation signal of the resonant optical gyroscope.
As shown in fig. 5, the present invention is a real-time case of a resonant optical gyroscope based on quadrature demodulation, and the present invention uses a semiconductor tunable laser as a tunable laser, a Y branch as an optical splitter, an optical phase modulator as a modulator, and a photodetector as an optoelectronic conversion module, and performs code writing on a development platform based on FPGA to implement a signal modulation and demodulation module, a signal processing module, a feedback locking module, and uses a digital multimeter or a personal computer as a data recorder.
Claims (2)
1. A detection method of a detection system of a resonant optical gyroscope based on orthogonal demodulation comprises an optical system consisting of a tunable laser, an optical isolator, an optical splitter, a first phase modulator, a second phase modulator, an optical resonant cavity and a photoelectric conversion module, and a signal processing system consisting of a signal modulation-demodulation module, a feedback locking module, a first signal processing module and a second signal processing module;
the tunable laser, the optical isolator and the optical branching unit are sequentially connected, the optical branching unit is respectively connected with a first phase modulator and a second phase modulator, the first phase modulator is connected with the optical resonant cavity, the second phase modulator is connected with the optical resonant cavity, the optical resonant cavity and the photoelectric conversion module are sequentially connected with a signal modulation and demodulation module, the signal modulation and demodulation module is connected with a first phase modulation module, the signal modulation and demodulation module is connected with a second phase modulation module, the signal modulation and demodulation module, a first signal processing module and a feedback locking module are sequentially connected with the tunable laser, and the signal modulation and demodulation module is connected with a second signal processing module;
the detection method is characterized by comprising the following steps:
(1) phase modulation: laser emitted by a tunable laser passes through an optical isolator, is divided into two beams with the same power through an optical splitter, and then is modulated through a first phase modulator and a second phase modulator respectively, specifically: signal modulation and demodulation module for generating carrier suppressionModulated signal U1(t) and U2(t) driving the first phase modulator and the second phase modulator to perform phase modulation, respectively, thereby performing phase modulation and carrier suppression of counterclockwise and clockwise light entering the optical resonator;
(2) quadrature demodulation of signals: two beams of light after phase modulation are input into the optical resonant cavity to form two counterclockwise and clockwise resonant beams, the two beams of light respectively enter the photoelectric detector to be converted into electric signals, the signal modulation and demodulation module generates same-frequency orthogonal signals to respectively demodulate the electric signals converted from the clockwise beams, and a demodulation signal U is generated3(t) and U4(t); the signal modulation and demodulation module generates same-frequency orthogonal signals to respectively demodulate the electric signals converted from the anticlockwise light beams to generate demodulation signals U5(t) and U6(t)；
(3) Signal processing of quadrature demodulation signal: in the second signal processing module, two orthogonal demodulation signals U in the clockwise direction3(t) and U4(t) squaring and adding the signals, and then opening the root to obtain a non-negative even function signal U7(t) according to the positive and negative of one path of orthogonal demodulation signal, carrying out U7(t) overturning to finally obtain an odd function signal U8(t); in the first signal processing module, two paths of orthogonal demodulation signals U in the counterclockwise direction5(t) and U6(t) squaring and adding the signals, and then opening the root to obtain a non-negative even function signal U9(t) according to the positive and negative of one path of orthogonal demodulation signal, carrying out U9(t) overturning to finally obtain an odd function signal U10(t)；
(4) And (3) gyro signal output: the counter-clockwise signal is processed by the first signal processing module and then is transmitted to the feedback locking module as an error signal, and the feedback locking module performs proportional and integral operation processing on the counter-clockwise signal and then controls the tunable laser in a feedback mode; and the clockwise signal is processed by the second signal processing module and then is output to the data recorder as a resonant optical gyro signal.
2. A detection method of a detection system of a resonant optical gyroscope based on orthogonal demodulation comprises an optical system consisting of a tunable laser, an optical isolator, an optical splitter, a first phase modulator, a second phase modulator, a third phase modulator, an optical resonant cavity and a photoelectric conversion module, and a signal processing system consisting of a signal modulation and demodulation module, a feedback locking module, a first signal processing module, a second signal processing module and a servo frequency shift module;
the tunable laser, the optical isolator and the optical branching unit are sequentially connected, the optical branching unit is respectively connected with a first phase modulator and a second phase modulator, the first phase modulator, a third phase modulator and the optical resonant cavity are sequentially connected, the second phase modulator is connected with the optical resonant cavity, the optical resonant cavity and the photoelectric conversion module are sequentially connected with a signal modulation and demodulation module, the signal modulation and demodulation module is connected with the first phase modulator, the signal modulation and demodulation module is connected with the second phase modulator, the signal modulation and demodulation module, the first signal processing module and the feedback locking module are sequentially connected with the tunable laser, and the signal modulation and demodulation module, the second signal processing module, the servo frequency shifting module and the third phase modulator are sequentially connected;
the detection method is characterized by comprising the following steps:
(1) phase modulation: laser emitted by a tunable laser passes through an optical isolator, is divided into two beams with the same power through an optical splitter, and then is modulated through a first phase modulator and a second phase modulator respectively, specifically: the signal modulation and demodulation module generates a carrier suppression modulation signal U1(t) and U2(t) driving the first phase modulator and the second phase modulator to perform phase modulation, respectively, thereby performing phase modulation and carrier suppression of counterclockwise and clockwise light entering the optical resonator;
(2) quadrature demodulation of signals: inputting two beams of light subjected to phase modulation into an optical resonant cavity to form two counterclockwise and clockwise resonant light beams, and respectively entering a photoelectric detector to be converted into electric signals; the signal modulation and demodulation module generates the same-frequency orthogonal signals to respectively convert the clockwise light beams into the electric signalsLine demodulation to generate a demodulated signal U3(t) and U4(t); the signal modulation and demodulation module generates same-frequency orthogonal signals to respectively demodulate the electric signals converted from the anticlockwise light beams to generate demodulation signals U5(t) and U6(t)；
(3) Signal processing of quadrature demodulation signal: in the second signal processing module, two orthogonal demodulation signals U in the clockwise direction3(t) and U4(t) squaring and adding the signals, and then opening the root to obtain a non-negative even function signal U7(t) according to the positive and negative of one path of orthogonal demodulation signal, carrying out U7(t) overturning to finally obtain an odd function signal U8(t); in the first signal processing module, two paths of orthogonal demodulation signals U in the counterclockwise direction5(t) and U6(t) squaring and adding the signals, and then opening the root to obtain a non-negative even function signal U9(t) according to the positive and negative of one path of orthogonal demodulation signal, carrying out U9(t) overturning to finally obtain an odd function signal U10(t)；
(4) And (3) gyro signal output: the counter-clockwise signal is transmitted to the feedback locking module as an error signal after passing through the first signal processing module, the feedback locking module performs proportional and integral operation on the counter-clockwise signal and then performs feedback control on the tunable laser, the clockwise signal is transmitted to the servo frequency shift module after passing through the second signal processing module and finally acts on the third phase modulator, so that the clockwise signal also works on a resonance frequency point, and the frequency shift quantity is a rotation output signal of the gyroscope.
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| CN110360997B (en) * | 2019-06-28 | 2021-06-01 | 浙江大学 | Detection system and method of time division multiplexing resonant optical gyroscope |
| US11656081B2 (en) * | 2019-10-18 | 2023-05-23 | Anello Photonics, Inc. | Integrated photonics optical gyroscopes optimized for autonomous terrestrial and aerial vehicles |
| CN111238464B (en) * | 2020-01-19 | 2021-11-09 | 浙江大学 | Detection method of resonant optical gyroscope based on reciprocity modulation and time division switching |
| CN112697124B (en) * | 2020-12-22 | 2022-04-26 | 浙江大学 | Square wave quadrature demodulation implementation method and device of closed-loop resonant optical gyroscope |
| CN113465630B (en) * | 2021-07-02 | 2023-09-22 | 浙江大学 | Optical resonant cavity free spectral line width online test system and method based on coherent demodulation |
| CN113587914B (en) * | 2021-07-28 | 2023-05-16 | 北京航空航天大学 | Spectrum separation method for inhibiting back reflection error of resonant integrated optical gyroscope |
| CN114280321B (en) * | 2021-12-24 | 2022-10-21 | 浙江大学 | Low-coherent-light three-piece hybrid integrated angular velocity detection system and method |
| CN114459457B (en) * | 2022-02-10 | 2023-06-13 | 浙江大学 | Resonant fiber-optic gyroscope system and method based on reciprocal modulation and secondary demodulation |
| CN115112113B (en) * | 2022-07-18 | 2023-03-03 | 哈尔滨工业大学 | Device and method for compensating relative intensity noise error of resonant fiber-optic gyroscope |
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