Closed loop control interference type optical fiber accelerometer

Abstract

The invention discloses a closed loop control interference type optical fiber accelerometer. Light is outputted form a light source, the output end of the light source is connected with a first input end of a first coupler, the input / output end of the first coupler is connected with the input / output end of a waveguide coupler part, and a detector is connected the first output end of the first coupler; the first output end, the second input end, the second output end and the first input end of the waveguide coupler part are respectively connected with the input end of a first isolator, the output end of a second isolator and the second input end and the first output end of a light fiber flexible disk; the first input end of the light fiber flexible disk is connected with the output end of the first isolator through a first light fiber ring, and the second output end of the light fiber flexible disk is connected with the input end of the second isolator through a second light fiber ring. The closed loop modulation detection method has the advantages of strong anti-interference capability, high stability, good linearity, accuracy unrelated with a measured valve, and large dynamic range, and thus the noise and shifting of the system are reduced, and the accuracy and the stability are improved.

Description

technical field [0001] The invention relates to an optical fiber accelerometer, in particular to a closed-loop control interference type optical fiber accelerometer. technical background [0002] The fiber optic accelerometer is a new type of inertial system integrating optical-mechanical-electrical technology. Because the fiber optic accelerometer has anti-electromagnetic interference and high sensitivity, it can be used in harsh environments (high temperature, high pressure, high field strength, flammable, explosive, etc.) , strong corrosion, etc.), small size, light weight, low cost and other advantages, has become a research hotspot in recent years. [0003] With the development of technology, the requirements for the sensitivity and frequency response of the accelerometer are getting higher and higher. But since the frequency of light is generally 10 14 Hz, photodetectors cannot track such high frequencies, so phase-modulated signals cannot be detected directly. Gene...

AI Technical Summary

Problems solved by technology

As an inertial system, the accelerometer is often used together with the gyroscope. The existing gyroscope signal modulation and detection technology is relatively mature. If it can be used in the signal modulation and detection of the accelerometer, it will bring great advantages, but now The structure of some accelerometers cannot directly follow the modulation detection system of the gyro signal

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