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Method and device for realizing dual-channel closed-loop resonant optical gyroscope

A technology for optical gyroscopes and implementation methods, which is applied in the field of optical sensing and signal detection, and achieves the effects of being beneficial to reciprocity, miniaturization, and simple circuit implementation

Active Publication Date: 2020-10-16
ZHEJIANG UNIV
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Problems solved by technology

[0008] The present invention aims at the problems of pulse noise, system miniaturization and backscattering noise caused by spectrum overlapping in the dual-channel closed-loop ROG system, and proposes a dual-channel closed-loop ROG based on sine-bipolar sawtooth wave phase modulation. The method and device for realizing

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  • Method and device for realizing dual-channel closed-loop resonant optical gyroscope
  • Method and device for realizing dual-channel closed-loop resonant optical gyroscope
  • Method and device for realizing dual-channel closed-loop resonant optical gyroscope

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Embodiment Construction

[0028] The present invention will be described in detail below in conjunction with examples and accompanying drawings, but the present invention is not limited thereto.

[0029] The realization method of dual-channel closed-loop ROG based on sine-bipolar sawtooth wave phase modulation includes:

[0030] The first loop of sine wave modulation obtains the difference between the resonant frequency of the first loop and the center frequency of the tunable semiconductor laser by detecting the amplitude of the primary frequency signal of the sine wave modulation frequency in the output signal of the first loop photodetector. The frequency difference signal is input to the first loop frequency servo control module, and the feedback signal is generated and input to the tuning terminal of the tunable semiconductor laser to control the center frequency of the output light of the tunable semiconductor laser, thereby locking the center frequency of the tunable semiconductor laser to the re...

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Abstract

The invention discloses a method and a device for implementing a two-way closed-loop resonant optical gyro based on sinusoidal-bipolar sawtooth wave phase modulation. The device provided by the invention comprises a first loop sine wave modulation signal generating module and a second loop bipolar sawtooth wave modulation signal generating module. According to the invention, two phase modulators are used to realize two-way closed loop, which is more conducive to system miniaturization and reciprocity than a sinusoidal-sawtooth wave modulation scheme using three phase modulators; sinusoidal wave modulation is used in the first loop, and slope-controllable bipolar sawtooth wave modulation is used only in the second loop; compared with bipolar sawtooth wave modulation and triangular-sawtoothwave modulation schemes, the method and the device are move conductive to reducing impulse noise; in particular compared with a triangular-sawtooth wave modulation scheme, the method and the device donot need to superimpose two modulated signals on the same phase modulator, and have the advantage of simpler circuit implementation; and a method for suppressing backscattered noise caused by frequency spectrum overlapping is provided according to the result of frequency spectrum analysis.

Description

technical field [0001] The invention relates to the technical field of optical sensing and signal detection, in particular to a method and device for realizing a dual-channel closed-loop resonant optical gyroscope based on sine-bipolar sawtooth wave phase modulation. [0002] technical background [0003] Resonator Optic Gyro (ROG) is an inertial sensor device that uses the optical Sagnac effect to detect the rotational angular velocity of an object. Compared with single-channel closed-loop ROG, dual-channel closed-loop ROG has the advantages of good linearity and large dynamic range. At present, in order to realize a dual-channel closed-loop system, schemes such as bipolar sawtooth phase modulation, sine-sawtooth phase modulation, and triangle-sawtooth phase modulation have been proposed. [0004] The bipolar sawtooth phase modulation scheme uses two lithium niobate (LiNbO 3 ) The phase modulator loads the modulation signal. Since this scheme uses bipolar sawtooth wave mo...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01C19/66
CPCG01C19/664
Inventor 应迪清谢涛王泽宇刘强叶科斌金仲和
Owner ZHEJIANG UNIV
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