Fiber-optic gyroscope with on-line fault self-checking function

Abstract

The invention discloses a fiber-optic gyroscope with an online fault self-checking function. A photoelectric detector 1 signal amplification and ADC sampling circuit in the detection circuit carries out power detection, voltage conversion and data sampling on a Sagnac interference optical signal. Through demodulating a signal of the photoelectric detector 1 in real time, the information of the Sagnac phase difference and the information of the phase closed-loop state can be continuously obtained. The signal amplification and ADC sampling circuit of the photoelectric detector 2 performs power detection, voltage conversion and data sampling on an original optical signal of the light source, and by monitoring the signal of the photoelectric detector 2 in real time, the information of the real-time value and the fluctuation amplitude of the optical power of the light source can be continuously obtained. According to the invention, real-time self-checking can be carried out on the working state of the fiber-optic gyroscope on line, whether the fiber-optic gyroscope is in a normal working state or an abnormal working state is automatically analyzed, and once the abnormal working state isfound, fault alarm information is sent out in time, so that the risk of adverse effects on an inertial system when the fiber-optic gyroscope works abnormally can be reduced.

Description

technical field [0001] The invention belongs to the technical field of optical fiber gyroscope preparation, in particular to an optical fiber gyroscope with an online fault self-checking function. Background technique [0002] Fiber optic gyro (FOG) is a new type of all-solid-state angular velocity measurement device based on the Sagnac effect, because of its high precision, large range, small size, light weight, low cost, long life, high integration, and low engineering difficulty. It is widely used in military fields such as aviation, aerospace, and navigation due to its advantages, and is one of the important components in the field of inertial technology. Over the years, experts and scholars at home and abroad have conducted in-depth research on the accuracy, range, temperature drift, dynamic response and other indicators of fiber optic gyroscopes, and achieved a lot of results. However, there are relatively few studies on the reliability of fiber optic gyroscopes. The ...

AI Technical Summary

Problems solved by technology

Over the years, experts and scholars at home and abroad have conducted in-depth research on the accuracy, range, temperature drift, dynamic response and other indicators of fiber optic gyroscopes, and achieved a lot of results. However, there are relatively few studies on the reliability of fiber optic gyroscopes. The gyroscope works normally at any time, and the fiber optic gyroscope cannot automatically alarm when it fails to work

This brings huge risks to the inertial system that uses the fiber optic gyroscope as the angular velocity and angle sensor. The inertial system cannot identify the working status of the fiber optic gyroscope in time. Once the fiber optic gyroscope outputs wrong data, it may cause the inertial system to work abnormally or even collapse.

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