激光频率调制干涉光纤测长方法研究  

Study of laser frequency modulation interferometric fiber length measurement method

作　　者：何泽聪 许新科 金陈凯 刘易 HE Zecong;XU Xinke;JIN Chenkai;LIU Yi(College of Metrology and Measurement Engineering,China Jiliang University,Hangzhou 310018,China)

机构地区：[1]中国计量大学计量测试工程学院,杭州310018

出　　处：《激光杂志》2024年第10期62-66,共5页Laser Journal

基　　金：浙江省自然科学基金(No.LY19F050008)。

摘　　要：光纤长度测量技术在光的传感领域起着至关重要的作用,如何精确地测量光纤长度是该领域的一个研究热点。激光频率调制干涉测量技术拥有高空间分辨率的测量优点,可用于光纤长度测量领域,但是调频非线性会导致频谱展宽,影响测距精度。提出一种基于Lomb-Scargle法的光纤测长技术,在对非线性校正的同时可以得到较为准确的测量值,其测量范围不受辅助路光程差限制。作为验证,对1.2 m左右长的光纤进行测长实验,可得到此方法的测量绝对误差基本稳定在50μm以内,拥有较高的测量精度。该方法为激光频率调制干涉测量技术的非线性校正提供了一种方法思路。Fiber length measurement technology plays a crucial role in the field of light sensing,and how to accurately measure fiber length is a research hotspot in this field.The laser frequency modulation interferometry technique has the advantage of high spatial resolution measurement,which can be used in the field of fiber length measurement,but the frequency modulation nonlinearity will lead to spectral broadening,which affects the ranging accuracy.This paper proposes a fiber length measurement technique based on the Lomb-Scargle method,which can obtain more accurate measurement values while correcting the nonlinearity,and its measurement range is not limited by the optical range difference of the auxiliary path.As a verification,about 1.2 m long fiber length measurement experiments,the absolute error of the measurement of this method is basically stable within 50μm,with a high measurement accuracy.This method provides a way of thinking for the nonlinear correction of laser frequency modulation interferometry.

关 键 词：激光频率调制干涉 光纤长度测量 Lomb-Scargle算法 非线性校正 

分 类 号：TN249[电子电信—物理电子学]