Embedded multi-peak FBG strain demodulation system for damage test and working method

Abstract

The embedded multi-peak FBG strain demodulation system for damage test and working method, the system comprises: an optical fiber processing module, which is deployed on the optical fiber strain sensor of the measured structure of the damage test equipment through the interface, captures the multi-peak FBG reflection spectrum associated with the dynamic strain in the damage process, completes photoelectric conversion, and outputs low sampling density spectrum data with fixed wavelength range and fixed sampling point number; an embedded processing module, which is integrated in the control unit of the damage test equipment or independently deployed in the test area, is built based on the ARM architecture, carries a general embedded operating system, provides a hardware environment for algorithm operation, simultaneously interacts with the optical fiber processing module, and outputs the demodulation result; an algorithm and adaptation module, which integrates multi-peak identification preprocessing, low sampling density spectrum interpolation adaptation, a lightweight physical constraint double-branch convolutional neural network and multi-peak wavelength demodulation, and executes complete processing from the original spectrum to the multi-peak center wavelength.

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