Optical fiber displacement sensor demodulation device

Abstract

The invention discloses an optical fiber displacement sensor demodulation device. The device comprises a broadband light source, an electro-optical modulator ad a computer, an output terminal of the broadband light source is connected with an optical fiber coupler, one output terminal of the optical fiber coupler is connected with a displacement sensing probe, the displacement sensing probe is connected to a to-be-detected object, the surface of the optical fiber coupler is provided with a reflector, an output port of the optical fiber coupler and the reflector form a Michelson interferometer,modulation signals output by the electro-optical modulator are emitted to a high-speed photoelectric detector through a dispersion optical fiber, the high-speed photoelectric detector converts optical signals to microwave signals, the microwave signals are amplified through a low noise amplifier, and an output terminal of the low noise amplifier is connected with a microwave power divider. According to the displacement sensor system, the resolution can be randomly adjusted through setting of component parameters of the system, the nano-scale displacement sensing precision can be realized through optimization parameters, and the defect of large influence of the change of factors including poor environmental adaptability and the jittering ambient temperature of the optical signals on the performance of the sensor is overcome.

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

Images