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在参考和测量阶段,基于SEFR提高OFDR感测性能

Tianle Chen, Zhou Xu, Lei Tu

|December 13, 2024

概括

本研究引入了一种新的同步相同频率重新采样 (SEFR) 方法,以提高光学频域反射计 (OFDR) 的性能. SEFR有效地弥补了随机激光频率扫描范围和非线性,提高了传感距离和精度.

科学领域:

光学工程是指光学工程.
计量学计量学是一门学科.
传感技术传感技术

背景情况:

光频域反射测量 (OFDR) 的性能受到由于随机激光频率扫描范围 (LFSR) 和扫描非线性而导致的传感点错位限制.
精确的分布式应变测量在各种工程应用中至关重要.

研究的目的:

为OFDR提出和验证一种新的同步相同频率重新采样 (SEFR) 方法.
为了同时补偿随机的LFSR和扫除OFDR系统中的非线性.
为了提高OFDR的传感距离和准确性,用于分布式应变测量.

主要方法:

开发同步相同频率重新采样 (SEFR) 方法.
构建一个新的线性频率序列用于信号重新采样.
在OFDR中将SEFR应用于参考阶段和测量阶段.
基于OFDR的SEFR对阶段解调 (PD) 和交叉相关解调 (CD) 的影响评估.

主要成果:

SEFR成功地消除了传感点错位和非线性频率间隔.
对于基于PD的OFDR,传感距离扩展到70米,在最糟糕的LFSR差异下,应变RMSE减少了16倍.
对于基于CD的OFDR,传感距离从6.8米扩展到70米,在最糟糕的LFSR差异下,应变RMSE减少了41倍.

结论:

拟议的SEFR方法通过解决关键局限性,显著提高了OFDR性能.
对于分布式应变传感,SEFR在传感距离和测量精度上都提供了显著的改进.
这种方法为高性能OFDR应用提供了强大的解决方案.

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