Optical fiber sensing wavelength demodulating system for resisting oscillation and noise disturbance

Abstract

The invention relates to an optical fiber sensing wavelength demodulating system for resisting oscillation and noise disturbance, comprising a light source, a coupler, a wavelength demodulating type sensor, a wavelength type reference device, an optical fiber isolator, an optical fiber interferometer, a module for wavelength demodulation, a photoelectric conversion and amplification circuit, a demodulating module and a subtracter, wherein the input end of the coupler is connected with the output end of the light source by an optical fiber; the input ends of the wavelength demodulating type sensor and the wavelength type reference device are connected with the output end of the coupler by the optical fibers; the input end of the optical fiber isolator is connected with the input end of thecoupler by the optical fiber; the input end of the optical fiber interferometer is connected with the output end of the optical fiber isolator by the optical fiber; the input end of the module for wavelength demodulation is connected with the output end of the optical fiber interferometer by the optical fiber; both input ends of the photoelectric conversion and amplification circuit are connectedwith both output ends of the module for wavelength demodulation by the optical fibers and used for converting two optical signals into voltage signals and amplifying the voltage signals; both input ends of the demodulating module are connected with both output ends of the photoelectric conversion and amplification circuit; and both input ends of the subtracter are connected with both output ends of the demodulating module.

Description

technical field [0001] The invention belongs to the technical field of optical fiber sensors, in particular to an optical fiber sensing wavelength demodulation system resistant to vibration and noise interference. Background technique [0002] Optical fiber sensor is a new type of sensor that uses optical fiber to perceive and transmit external signals. Using the modulation of different parameters of light waves by external physical quantities, fiber optic sensors can be divided into: wavelength modulation type, light intensity modulation type, phase modulation type and polarization state modulation type. Wavelength modulated optical fiber sensors have the advantages of strong anti-interference ability, simple probe structure, and convenient large-scale network multiplexing. They are widely used in civil engineering, transportation engineering, petroleum industry, aerospace, national defense and security and many other fields. [0003] The fiber grating sensor is a typical ...

AI Technical Summary

Problems solved by technology

However, the interferometer made by this method is large in size, heavy in weight, complex in structure, difficult in process, and the isolation effect on vibration and noise is usually limited to a limited frequency range

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