Gray-code-based large-scale fiber grating sensing network demodulating system and method

Abstract

The invention discloses a Gray-code-based large-scale fiber grating sensing network demodulating system. A signal output end of a Gray code pulse generation module is connected with a control signal input end of an adjustable narrow band light source, a signal output end of the adjustable narrow band light source is connected with a first interface of an optical coupler, a second interface of theoptical coupler accesses a grating sensing network, a third interface of the optical coupler is connected with a signal input end of a signal collecting module through a photoelectric converter, and asignal output end of the signal collecting module is connected with a signal input end of a signal processing module. Accordingly, a Gray code coding theory is cited, fiber grating sensing network characteristics are combined, and pulse coding and decoding modes special for the fiber grating sensing network are provided.

Description

technical field [0001] The invention belongs to the technical field of fiber grating sensing, and in particular relates to a large-scale fiber grating sensing network demodulation system and method based on Gray codes. technical background [0002] With the continuous maturity of fiber grating sensing technology, fiber grating is widely used in large-scale civil engineering, power engineering, petrochemical engineering, bridges, tunnels, dams, mining and other safety and health monitoring and disaster forecasting and monitoring due to its unique advantages. Due to the increasing demand for engineering applications, fiber grating sensor networks are developing towards long-distance, large-capacity, quasi-distributed and other large-scale networking methods. [0003] For large-scale networking methods, at present, multiple sampling and averaging are usually used to denoise the signal, but for large-scale fiber grating sensor networks, it takes a long time to complete a set of ...

AI Technical Summary

Problems solved by technology

For large-scale identical array gratings, since the wavelengths of light reflected by the gratings in the grating array are the same, if the pulse encoding and decoding methods of Gray code are directly used in the fiber grating sensor network, the optical pulses generated by continuous encoding , there is an optical pulse whose pulse width is too large to make the reflected light of adjacent gratings indistinguishable, so that the reflected light of adjacent gratings will produce overlapping crosstalk under a wide optical pulse, and thus cannot be correctly demodulated

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