Detection system and method for resonant optical gyro based on pulsed light detection

A technology for optical gyroscopes and detection systems, applied in Sagnac effect gyroscopes, gyroscopes/steering sensing equipment, measuring devices, etc., can solve problems such as backscattering noise, avoid mutual coupling, and suppress backscattering noise effect

Active Publication Date: 2019-10-22
ZHEJIANG UNIV
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  • Abstract
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Problems solved by technology

[0004] The purpose of the present invention is to address the deficiencies of the prior art, to provide a detection system and method of a resonant opti

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  • Detection system and method for resonant optical gyro based on pulsed light detection
  • Detection system and method for resonant optical gyro based on pulsed light detection
  • Detection system and method for resonant optical gyro based on pulsed light detection

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Embodiment Construction

[0026] 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.

[0027] Such as figure 1 As shown, it is a detection system of resonant optical gyroscope based on pulsed light detection, which includes an optical system composed of tunable laser, phase modulator, pulsed light modulator, optical resonant cavity, photodetector and generated by pulse signal module, signal modulation and demodulation module, and feedback locking module; the tunable laser, phase modulator, and pulsed light modulator are connected sequentially through optical fibers; the two outputs of the pulsed light modulator are connected to the optical resonant cavity, and the optical The output of the resonant cavity is connected to the photodetector through an optical fiber, the output signal of the photodetector is input to the modulation and demodulation module, the modulation signal generated by...

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Abstract

The invention discloses a detection system and method for a resonant optical gyro based on pulsed light detection. According to the invention, phase modulation is carried out on continuous light outputted by a laser; a pulse light modulator driven by two pulse signals in opposite phases is used to convert the continuous light into pulsed light and then input the pulsed light into an optical annular resonant cavity; and clockwise and counterclockwise output signals of the resonant cavity are synchronously demodulated, wherein one demodulated output passes through a servo loop to stabilize the laser frequency, and the other demodulated output is used as a rotation signal of the gyro. According to the invention, a pulsed beam is used to separate clockwise and counterclockwise beams in the annular resonant cavity in time, so as to avoid energy coupling between signal light and backscattered light; backscattered noise is eliminated; the signal-to-noise ratio of an output signal is improved;and at the same time the reciprocity of the system is improved.

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 gyroscope based on pulse light detection. Resonant optical gyroscopes include resonant fiber optic gyroscopes with optical fiber ring resonators as sensitive components and resonant integrated optical gyroscopes with optical waveguide ring resonant cavities as core sensitive components. Background technique [0002] Resonator Optic Gyroscope (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 has greater advantages in miniaturization and integration. [0003] Because the Sagnac effect is a weak effect, and the optical noise in the re...

Claims

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Application Information

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IPC IPC(8): G01C19/66
CPCG01C19/66G01C19/661
Inventor 林伊李汉钊马慧莲金仲和
Owner ZHEJIANG UNIV
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