Detection system and method of resonant optical gyroscope based on quadrature demodulation

A technology of orthogonal demodulation and detection system, which is applied in the direction of Sagnac effect gyroscope, gyroscope/steering sensing equipment, measuring device, etc. It can solve the problems of phase noise and gyroscope output influence, so as to improve the stability, Effect of improving signal-to-noise ratio and suppressing phase noise

Active Publication Date: 2020-04-24
ZHEJIANG UNIV
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Problems solved by technology

And the instruments in the system have phase noise, which will affect the output of the gyroscope

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  • Detection system and method of resonant optical gyroscope based on quadrature demodulation
  • Detection system and method of resonant optical gyroscope based on quadrature demodulation
  • Detection system and method of resonant optical gyroscope based on quadrature demodulation

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Embodiment Construction

[0030] The present invention will be described in detail below in conjunction with the embodiments and accompanying drawings, but the present invention is not limited thereto.

[0031] Such as figure 1 As shown, a detection system based on a quadrature demodulation resonant optical gyroscope is characterized in that it includes a tunable laser, an optical isolator, an optical splitter, a first phase modulator, a second phase modulator, An optical system composed of an optical resonant cavity and a photoelectric conversion module, and a signal processing system composed of a signal modulation and demodulation module, a feedback locking module, a first signal processing module, and a second signal processing module;

[0032] The tunable laser, the optical isolator and the optical splitter are connected in sequence, the optical splitter is respectively connected with the first phase modulator and the second phase modulator, the first phase modulator is connected with the optical ...

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Abstract

The invention discloses a quadrature demodulation-based detection system and a quadrature demodulation-based detection method of a resonator optic gyro. Firstly, the phase of laser input to an opticalring resonant cavity is modulated, and synchronous quadrature demodulation is performed on clockwise and counterclockwise output signals going out of the cavity, wherein one quadrature demodulation signal is processed and then serves as an error signal for controlling the frequency of a laser through a servo loop, so that the output light frequency of the laser is locked at the resonant frequencythereof in a tracking manner; the other quadrature demodulation signal is processed and then output as a gyro signal. By the detection method of the resonator optic gyro, provided by the invention, automatic adjustment of the demodulation phase to the maximum sensitivity point is facilitated; the phase noise of a component in a system loop is suppressed, and the signal-to-noise ratio of the system is increased.

Description

technical field [0001] The invention relates to the technical field of signal detection, in particular to a detection system and method of a resonant optical gyro with quadrature demodulation. Resonant gyroscopes include resonant fiber optic gyroscopes with optical fiber ring resonators as sensitive components and resonant integrated optical gyroscopes with optical waveguide resonant cavities as core sensitive components. Background technique [0002] Resonator Optic Gyro (ROG) is a high-precision miniature inertial sensor that uses the optical Sagnac effect to detect rotation. The resonant optical gyro without vibrating parts has the advantages of miniaturization, high precision and anti-vibration. Compared with Micro Electro Mechanical Systems (MEMS) and Interferometric Fiber Optical Gyroscope (IFOG), ROG will have greater advantages. [0003] Because the Sagnac effect is a very weak effect, and the optical noise of the resonant optical gyroscope is very strong, so in th...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01C19/72
CPCG01C19/72G01C19/721
Inventor 吴传斌林伊马慧莲金仲和
Owner ZHEJIANG UNIV
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