光学学报, 2017, 37 (8): 0806001, 网络出版: 2018-09-07   

基于光频域反射计的光纤分布式传感中光谱分辨率提升技术 下载: 1037次

Spectral Resolution Improvement Technique for Optical Frequency-Domain Reflectometry-Based Optical Fiber Distributed Sensing
作者单位
中国航空工业集团公司西安飞行自动控制研究所, 陕西 西安 710065
摘要
为实现对飞行器结构高精度、高分辨率的健康监测,开展了对光频域反射光纤分布式传感技术的研究。介绍了瑞利散射光谱互相关分布式传感的原理,分析了传统互相关法中传感单元长度对光谱分辨率的限制因素,提出利用傅里叶插值法提高光谱分辨率的方法,并进行了实验验证。实验结果表明,采用所提方法可在长度为14.2 m的单模光纤上实现传感单元长度为1 cm、光谱分辨率为1.6 pm的连续分布式传感。所提方法在高精度、高分辨率的短、中程健康监测领域具有广阔的应用前景。
Abstract
A research for optical fiber distributed sensing technique based on optical frequency-domain reflectometry is conduct to realize the health monitoring for aircraft structure with high accuracy and high resolution. The principle of cross-correlation distributed sensing based on Rayleigh scattering spectrum is introduced, and the limitation factor of sensing gauge length in traditional cross-correlation method on spectral resolution is analyzed. A Fourier interpolation method is proposed to enhance the spectral resolution, and experiments are carried out to verify the spectral resolution. The experimental results show that continuous distributed sensing can be obtained with the proposed method when we use a 14.2 m single mode fiber with spectral resolution of 1.6 pm and sensing gauge length of 1 cm. The proposed method with high accuracy and high resolution is promising in short and medium health monitoring applications.

张超, 杨楠, 包艳, 郑普超, 张兵. 基于光频域反射计的光纤分布式传感中光谱分辨率提升技术[J]. 光学学报, 2017, 37(8): 0806001. Chao Zhang, Nan Yang, Yan Bao, Puchao Zheng, Bing Zhang. Spectral Resolution Improvement Technique for Optical Frequency-Domain Reflectometry-Based Optical Fiber Distributed Sensing[J]. Acta Optica Sinica, 2017, 37(8): 0806001.

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