Fiber Bragg Grating Sensor Signal Demodulation Method Based on Linear Working Matched Grating Method

Abstract

The fiber Bragg grating sensor signal demodulation method based on the linear working matching grating method belongs to the field of optical fiber sensing technology; the reflected signal of the fiber Bragg grating to be tested enters through the input port of the reflected signal of the fiber Bragg grating to be measured through an isolator and a 50:50 fiber coupler. After the optical power detector A and the other part pass through the reference fiber grating, the overlapping part of the two spectra is reflected, and the reflected signal enters the optical power detector B through a 50:50 fiber coupler, and the optical power meter converts the optical power detectors A and B After the signal is divided and calculated, it is converted into an optical power ratio electrical signal, which is sent to the measurement computer to establish the relationship between the central wavelength of the reflected signal spectrum of the fiber Bragg grating to be tested and the ratio of optical power, so that the ratio of the central wavelength of the reflected signal spectrum of the optical fiber grating to be measured to the optical power The relationship is linear, and the fiber Bragg grating sensor signal demodulation without temperature coupling is realized; the invention has the advantages of simple signal processing, high resolution and fast demodulation speed.

Description

technical field [0001] The invention belongs to the technical field of optical fiber sensing, in particular to a signal demodulation method of an optical fiber Bragg grating sensor based on a linear working matching grating method. Background technique [0002] Due to its high sensitivity and precision, the use of wavelength coding to achieve absolute measurement, point or distributed measurement and other properties, the fiber Bragg grating sensor is currently a widely used fiber optic sensor, and it is widely used in the fields of fiber optic communication and fiber optic sensing. It has received extensive attention and achieved great development. [0003] With the increasing application of fiber grating sensors, the signal demodulation technology of fiber grating sensors, as a crucial part of fiber grating sensing applications, has also developed rapidly in recent years. The most direct method of fiber grating demodulation is to use a spectrometer. This demodulation meth...

AI Technical Summary

Problems solved by technology

However, the current common methods have problems such as high environmental requirements, slow demodulation speed, and incompatibility between demodulation resolution and system simplicity.

Images