Optical fiber multi-domain sensing system and demodulation method

Abstract

The invention relates to an optical fiber multi-domain sensing system and a demodulation method. The system comprises a sensing system light path which is mainly composed of a broadband light source, a light pulse modulation module, an adjustable FP filter, distributed microstructure sensing optical fibers, a circulator, a spectral calibration device and a time-delay optical fiber; a sensing system signal generation and data acquisition unit which is composed of a DA module, an AD module, an FPGA module, a detector, a receiving circuit and a driving circuit; and a data transmission processing unit which is composed of a data processing module and an I / O transmission bus. High-speed, high-precision and broadband demodulation of wavelength domain, frequency domain, time domain and other multi-domain information of light sensing signals can be realized so that the optical fiber multi-domain sensing system has advantages of small size, compact and stable structure and high reliability.

Description

technical field [0001] The invention relates to the field of optical fiber sensing, in particular to a multi-dimensional multiplexing optical fiber sensing system and a demodulation method for multi-domain information such as optical signal wavelength, frequency and time delay. Background technique [0002] Distributed optical fiber sensing network has the advantages of high sensitivity, wide frequency range, large dynamic range of measurement, anti-electromagnetic interference, pressure resistance and corrosion resistance, light weight, small size, and long sensing distance. It is widely used in large buildings such as stadiums and bridges. in health monitoring. In coal mines, oil pipelines, long-distance transmission lines and other application scenarios, the advantages of optical fiber sensor networks for long-distance sensing and large-capacity sensor nodes make them irreplaceable by other sensors and sensor networks. Moreover, increasing the number of sensing nodes in ...

AI Technical Summary

Problems solved by technology

[0010] The technical problem to be solved by the present invention is to propose a system and method related to providing high-resolution spectrum demodulation, time-domain pulse demodulation, and spectrum information demodulation for an optical fiber sensor network based on spectrum demodulation, making up for the existing The defect that the optical fiber sensing demodulation device cannot demodulate the large-capacity multi-domain microstructure sensing network,

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