Substrate deformation measurement system adaptive fitting method and system based on fiber bragg grating

By using an adaptive fitting algorithm to dynamically identify sensitive points and combining multi-scale analysis and filtering, the problem of insufficient fitting accuracy of traditional fiber Bragg grating sensors in extreme environments is solved, achieving high-precision deformation measurement, which is suitable for satellite optical payloads and other high-precision deformation measurement fields.

CN121144682APending Publication Date: 2025-12-16SHANGHAI SATELLITE ENG INST
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Patent Information

Application Number
CN202511124274.6
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2025-08-12
Publication Date
2025-12-16

AI Technical Summary

Technical Problem

Traditional fiber Bragg grating sensors suffer from severe noise interference in extreme space environments, resulting in insufficient stress-wavelength fitting accuracy and making it difficult to meet the real-time monitoring needs of satellite systems and other complex environments.

Method used

An adaptive fitting algorithm is employed, which involves dynamic sensitive point identification, multi-scale analysis, model fusion, and adaptive filtering to construct an adaptive fitting model and achieve high-precision fitting of the stress-wavelength relationship.

Benefits of technology

It improves the accuracy and stability of stress-wavelength fitting, adapts to complex environmental changes, and achieves high-precision deformation measurement, making it suitable for satellite optical payloads and other high-precision deformation measurement fields.

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Abstract

The invention provides a self-adaptive fitting method and system for a substrate deformation measurement system based on a fiber bragg grating (FBG), and the method comprises the steps: reading an output signal of an FBG sensor network, respectively collecting the wavelength data of a grating sensor and the stress data of a stress sensor at the same position as the grating sensor, and constructing a stress-wavelength data set; fBG data points with most sensitive deformation response are automatically identified, and a dynamic sensitive point set is formed and then preprocessed; a set needing to be continuously monitored is analyzed and determined, a specific point is selected to execute an adaptive segmentation fitting algorithm, segmentation points and fitting polynomial coefficients of all subintervals are output, and a final fitting model is constructed; according to the sub-interval of the wavelength value measured by the FBG sensor, calling a sub-interval fitting model, calculating a corresponding stress value, and further obtaining the deformation quantity of the measured object. According to the invention, the contradiction between the monitoring efficiency and precision of the traditional uniform layout in a complex stress scene is solved, and the technical path and the application target have remarkable industry uniqueness.
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