Micro-resonant optical gyroscope signal detection device and method based on sensing ring tuning
A signal detection and optical gyroscope technology, applied in the field of inertial sensing, to avoid use, reduce design requirements, and facilitate integrated integration
Active Publication Date: 2022-04-05
ZHEJIANG UNIV
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[0005] The invention provides a micro-resonant optical gyro signal detection device and method based on sensing ring tuning. The technical problem to be solved is to avoid the use of high-performance tunable lasers, make the resonant optical gyroscope easier to integrate, and reduce Noise caused by refractive index fluctuations caused by temperature, stress and other factors
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[0018] The present invention will be further described below in conjunction with specific embodiments and accompanying drawings.
[0019] Such as figure 1 As shown, the resonant optical gyro signal detection device based on sensing ring tuning includes a fixed laser source 1, a beam splitter 2, a first phase modulator 3, a second phase modulator 4, a first modulation signal generator 20, a second Two modulation signal generators 21, the first circulator 5, the second circulator 6, the optical waveguide ring resonator modulator 7, the first photodetector 8, the second photodetector 12, the first lock-in amplifier 9, the first Two lock-in amplifiers 13, a first low-pass filter 10, a second low-pass filter 14, and an FPGA (Field Programmable Gate Array, Field Programmable Gate Array) development board 11 with dual analog-to-digital / digital-to-analog conversion. The fixed laser 1 is connected to one end of the beam splitter 2; the other end of the beam splitter 2 is divided into ...
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The invention discloses a micro-resonance optical gyro signal detection device and method based on sensing ring tuning. The output light of the fixed laser is divided into anticlockwise and clockwise two paths after passing through the beam splitter. The anticlockwise path passes through the first phase modulator and the first circulator and enters the optical waveguide ring resonator modulator through cross coupling, and the clockwise path passes through the first phase modulator. The two-phase modulator and the second circulator enter the optical waveguide ring resonator modulator through cross-coupling; after passing through the ring resonator modulator, the clockwise signal is decoded through a photodetector, a lock-in amplifier, and a low-pass filter. Modulation output and demodulation output of one counterclockwise signal. The invention can avoid the use of high-performance adjustable lasers, reduce the design requirements of the lasers, and is more conducive to the integrated integration of resonant optical gyroscopes; at the same time, the fluctuation of the refractive index can no longer become the noise of the sensing ring.
Description
technical field [0001] The invention relates to the field of inertial sensing, in particular to a micro-resonant optical gyro signal detection device and method based on sensing ring tuning. Background technique [0002] The resonant optical gyroscope is a high-precision inertial sensor device that uses the optical Sagnac effect (Sagnac effect) to detect rotation. The core sensitive part of the optical gyroscope is a passive ring resonant cavity composed of optical waveguide or optical fiber, referred to as resonant cavity. When the resonant cavity rotates around the axis perpendicular to the plane where it is located, a resonant frequency difference proportional to the rotation angular rate will be generated between the clockwise and counterclockwise beams propagating in the resonant cavity, and the carrier rotation can be obtained by detecting the resonant frequency difference Angular rate. There is a feedback control loop in the general resonant optical gyro signal dete...
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IPC IPC(8): G01C19/72
CPCG01C19/727G01C19/721
Inventor 林孟欣储涛
Owner ZHEJIANG UNIV