Optical fiber grating sensor array and wavelength demodulating system thereof

Abstract

The invention discloses an optical fiber grating sensor array and a wavelength demodulating system thereof. The fiber grating sensor array is formed by connecting a plurality of the same optical fibersensor array sections with a main optical fiber connected with an optical fiber delay line through an optical fiber beam splitter with different light splitting ratios. The wavelength demodulation system of the optical fiber grating sensor array is composed of a broadband light source, a tunable filter, a pulsed light modulator, an optical power amplifier, the optical fiber beam splitter, an etalon, an optical detector, a control and signal processing circuit and the like. The wavelength demodulation system of the optical fiber grating sensor array comprises wavelength scanning of the tunablefilter and modulation control of the pulsed light modulator in signal control, and comprises three data processing steps of optical fiber grating sensor array section data division, spectral peak finding and wavelength calculation in data processing. The optical fiber grating sensor array has the characteristics of being high in optical fiber grating sensor capacity, strong in multiplexing capability and the like, thereby having practical engineering values.

Description

technical field [0001] The invention relates to the field of optical fiber sensing technology, in particular to an optical fiber grating sensor array and a wavelength demodulation system thereof. Background technique [0002] Fiber Bragg grating sensor array is a sensor array that connects multiple fiber Bragg grating sensors through optical fibers to measure multiple locations and multiple physical quantities on the fiber. It is an important direction of fiber Bragg grating sensor technology. At present, fiber grating sensor arrays have been applied in the fields of ocean parameter measurement, building structure health monitoring, etc. Measurement system, fiber grating inclination measurement system for landslide monitoring, etc. [0003] With the development and application of fiber grating sensing technology, the requirements for sensor capacity and multiplexing of fiber grating sensor arrays are increasing in practical engineering applications, that is, more than one h...

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Problems solved by technology

[0003] With the development and application of fiber grating sensing technology, the requirements for sensor capacity and multiplexing of fiber grating sensor arrays are increasing in practical engineering applications, that is, more than one hundred fiber grating sensors need to be connected in series on one fiber. Fiber Bragg grating sensor demodulation system, such as wavelength scanning wavelength demodulation system, grating spectroscopic wavelength demodulation system, the sensor capacity of each channel is limited, it is difficult to meet the demand, therefore, to develop a high-capacity fiber grating sensor The array and its wavelength demodulation system, that is, connecting more than one hundred FBG sensors on a single sensing channel and being able to realize the wavelength demodulation of each FBG, is the key to the popularization and application of FBG sensor arrays, and meets the needs of FBG array sensing technology. development needs

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