Combined modulation low-coherence light integration-based angular velocity detection system and method
A technology of angular velocity detection and low coherence light, applied in the field of signal detection, can solve the problems of increasing the complexity of system signal processing and unfavorable system miniaturization, and achieve the effects of reducing optical parasitics, suppressing drift, and improving stability
Active Publication Date: 2022-04-01
ZHEJIANG UNIV
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The appearance of these noises will increase the complexity of system signal processing, and also limit the improvement of system accuracy, and it is not conducive to the realization of system miniaturization
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[0023] The present invention will be described in detail below in conjunction with examples and accompanying drawings, but the present invention is not limited thereto.
[0024] Such as figure 1 As shown, the integrated angular velocity detection system based on combined modulation low coherent light in this embodiment includes an optical system composed of a low coherent light source and a photodetector module, a coupler and an optical waveguide resonator module, a phase modulator and a mirror module, and A signal processing system composed of a signal modulation and demodulation module; the low-coherence light source and photodetector module includes a low-coherence light source and a photodetector, the coupler and an optical waveguide resonator module includes a coupler and an optical waveguide resonator, and a phase modulator The mirror module includes a phase modulator and a mirror; a low-coherence light source, a coupler, an optical waveguide resonator, and a phase modul...
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The invention discloses an angular velocity detection system and method based on combination modulation low-coherence light integration. Low-coherence light output by a low-coherence light source enters an optical waveguide resonant cavity, then light output from the transmission end of the resonant cavity enters the resonant cavity again after being combined and modulated, and finally light signals are output from an initial incident port and become output of the system after being demodulated. The low-coherence light is applied to angular velocity detection by utilizing an ingenious structure, so that a plurality of optical parasitic effects such as polarization noise and residual intensity noise in a traditional resonant micro-optical gyroscope are reduced from the source, and backscattering noise is inhibited by utilizing a combined modulation means; the system structure is simplified, and the stability of the system is improved to a great extent. In addition, the integrated design is more beneficial to the reduction of system drift and the realization of miniaturization.
Description
technical field [0001] The invention relates to the technical field of signal detection, in particular to a combined modulation technology applied to low-coherence light sources and optical waveguide resonant cavity angular velocity detection. The optical resonant cavity has the function of frequency selection and filtering of the input light. According to the optical Sagnac effect, the resonant cavity has different filtering characteristics for the clockwise optical path and the counterclockwise optical path at different rotational angular velocities. Based on this characteristic, it can be used to detect the angular velocity of the system. . Background technique [0002] The resonant optical gyroscope is a high-precision inertial sensor that uses the optical Sagnac effect to detect angular velocity. It includes two types: resonant fiber optic gyroscope and resonant micro-optical gyroscope. Among them, the resonant fiber optic gyroscope uses a fiber resonator as its sensit...
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IPC IPC(8): G01C19/66
Inventor 刘霜刘路马慧莲
Owner ZHEJIANG UNIV