Detection apparatus and method for miniature resonance type optical gyroscope with double-signal combined modulation

Abstract

The invention discloses a device and a method for detecting a micro resonant mode optical gyro in dual-signal combined modulation. The method comprises the following steps: firstly, carrying out the dual-signal combined modulation to a laser input into the chip of a micro optical ring-shaped resonant cavity, and synchronously demodulating the clockwise and counterclockwise output signals of the optical ring-shaped resonant cavity, wherein, one demodulated signal controls the frequency of a laser device through a servo loop, so that the frequency of the output light of the laser device can be tracked and locked on the resonant frequency; and the other demodulated signal extracts the difference of the two resonant frequencies and outputs the difference as a gyro signal. The invention is favorable for realizing the micro resonant mode optical gyro in an integrated optical device and the miniaturization of the system, improves the output signal-to-noise ratio of the micro resonant mode optical gyro, suppresses the noise caused by backscattering, and reduces the control precision in modulation amplitude required by the system and improves the stability of the system at the same time.

Description

technical field [0001] The invention relates to the technical field of signal detection, in particular to a detection device and method for a micro-resonant optical gyroscope modulated by combination of dual signals. Background technique [0002] Resonator Micro Optic Gyro (R-MOG) is a high-precision miniature inertial sensor that uses the optical Sagnac effect to detect rotation. The micro-resonant optical gyro without vibrating parts has the advantages of miniaturization, high precision and anti-vibration. Compared with MicroElectro Mechanical Systems (MEMS) and Fiber Optic Gyroscope (Interferometric Fiber Optical Gyroscope, IFOG), R-MOG will have greater advantages. [0003] Because the Sagnac effect is a very weak effect, and the optical noise of the resonator optical gyroscope is very strong, so in the micro resonator optical gyroscope system, signal modulation and detection and noise suppression technology occupy a very important position. [0004] With the developme...

AI Technical Summary

Problems solved by technology

In order to obtain a high carrier suppression ratio, Acousto-Optical Modulator (AOM) is often used to realize, however, AOM is bulky, which is not conducive to miniaturization and integration; in addition, single-signal modulation applied to the phase modulator can be used to achieve Obtain a high carrier suppression ratio, but this often requires high control accuracy of the modulation amplitude, and it is very difficult to achieve

Images