Fiber displacement sensor demodulating device

Abstract

The invention discloses a fiber displacement sensor demodulating device which comprises a wide spectrum light source, an electro-optic modulator and a computer. The output end of the wide spectrum light source is connected with a fiber coupler. One output end of the fiber computer is connected with a displacement sensing probe. The displacement sensing probe is connected with a to-be-measured object. Furthermore the surface of the fiber coupler is provided with a reflector. The output port of the fiber coupler and the reflector form a Michelson interferometer. A modulated signal which is output from the electro-optic modulator is incident to a high-speed photoelectric detector through a dispersion fiber. The high-speed photoelectric detector converts an optical signal to a microwave signaland is amplified through a low-noise amplifier. The output end of the low-noise amplifier is connected with a microwave power divider. The resolution of the displacement sensing system can be randomly adjusted through setting the component parameter of the system. Through optimizing the parameter, nanometer-grade displacement sensing precision can be realized, thereby overcoming a defect of low environment adaptability and high influence of the change of factors such as jitter environment temperature of the optical signal to performance of the sensor.

Description

technical field [0001] The invention relates to a demodulation device, in particular to a demodulation device for an optical fiber displacement sensor. Background technique [0002] The basic working principle of the optical fiber sensor is to send the optical signal from the light source to the modulator through the optical fiber, so that after the parameter to be measured interacts with the light entering the modulation area, the optical properties of the light (such as light intensity, wavelength, frequency, phase, etc.) , polarization state, etc.) changes and becomes the modulated signal source, which is sent to the optical detector through the optical fiber, and after demodulation, the measured parameters are obtained [0003] At present, optical fiber displacement sensors mainly include fiber grating, fiber optic F-P and fiber M-Z interferometer and other types of sensors. Among them, the power utilization rate of the fiber grating sensor is low, the measurement accura...

AI Technical Summary

Problems solved by technology

[0005] The technical problem to be solved by the present invention is to overcome the defect that the performance of the sensor is greatly affected by the change of factors such as poor environmental adaptability and jittering of the optical signal and environmental temperature during the working process of the existing demodulation device, and to provide a demodulation of the optical fiber displacement sensor device, thereby solving the above-mentioned problems

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