Full-parallel fiber large-strain demodulation displacement correction method based on dynamic time warping

By employing dynamic time warping algorithms and fully parallel computing, the problems of optical fiber position drift and scale distortion under large strain conditions were solved, achieving high-precision strain demodulation and breaking through the bottleneck of existing technologies.

CN122408644APending Publication Date: 2026-07-17GUANGDONG UNIV OF TECH
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Patent Information

Application Number
CN202610520811.7
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2026-04-20
Publication Date
2026-07-17

AI Technical Summary

Technical Problem

Under extreme conditions such as earthquake resistance in bridges and large deformation of surrounding rock in mines, fiber optic sensing systems suffer from position drift and scale distortion due to ultra-large axial strain, making it difficult for existing technologies to achieve high-precision strain demodulation.

Method used

By employing the Dynamic Time Warping (DTW) algorithm combined with a fully parallel computing architecture, nonlinear alignment of the reference scattering spectrum and the sensing scattering spectrum is achieved, the correspondence of scattering points is obtained, and the cumulative position offset is corrected, thus breaking through the linear matching limitation of traditional methods.

Benefits of technology

It achieves high-precision demodulation of fiber strain under ultra-large strain conditions, eliminates the effects of position drift and scale transformation, and improves the accuracy and efficiency of strain measurement.

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Abstract

本发明提出一种基于动态时间规整（DTW）的全并行光纤大应变解调位移校正方法，隶属于光纤传感技术范畴。该方法直接采用 DTW 算法实现参考散射谱与传感散射谱的非线性匹配，精准解算大应变情况下光纤的空间位置偏移；通过构建距离矩阵与变形矩阵、搜索最优非线性映射路径，获取解调窗口内的空间映射关系，完成传感散射谱的信号对齐。本方法可有效补偿超大应变引发的全局位置漂移，恢复散射谱相关性，突破传统互相关算法仅能处理线性位移的局限，显著削弱尺度变换与累积偏差对应变解调的干扰，适用于大应变幅值 (>1%)的分布式光纤高精度解调。
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Citation Information

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