注意：通过减少包层单模光纤提高光学频域反射仪中的分布式应变传感灵敏度。

Note: Improving distributed strain sensing sensitivity in OFDR by reduced-cladding single mode fiber.

作者信息

Ding Zhenyang, Yang Di, Du Yang, Zhou Yonghan, Xu Zhexi, Liu Kun, Jiang Junfeng, Liu Tiegen

机构信息

College of Precision Instrument and Opto-Electronics Engineering, Tianjin University, Tianjin 300072, China and The Key Laboratory of Opto-Electronics Information Technology, Tianjin University, Ministry of Education, Tianjin 300072, China.

出版信息

Rev Sci Instrum. 2016 Dec;87(12):126106. doi: 10.1063/1.4973119.

DOI:10.1063/1.4973119

PMID:28040914

Abstract

We present a method to improve distributed strain sensing sensitivity by a reduced-cladding single mode fiber (RC SMF) using a Rayleigh backscattering spectra shift in optical frequency domain reflectometry. Comparing with a standard SMF with 250 μm diameter, a commercial low attenuation RC SMF with 165 μm diameter is shown to enhance the strain sensing sensitivity by about four-fold. Using this property, the system using the RC SMF can achieve smaller minimal measurable strain (MMS) in the same sensing spatial resolution (SSR) or smaller SSR in the same MMS than using the standard SMF. In our experiment, the system using RC SMF can achieve the MMS of 15 μstrain with a SSR of 4.5 cm or the MMS of 3 μstrain with a SSR of 18 cm.

摘要

我们提出了一种通过使用光学频域反射仪中的瑞利背向散射光谱偏移的低包层单模光纤（RC SMF）来提高分布式应变传感灵敏度的方法。与直径为250μm的标准单模光纤相比，直径为165μm的商用低衰减RC SMF的应变传感灵敏度提高了约四倍。利用这一特性，与使用标准单模光纤相比，使用RC SMF的系统在相同的传感空间分辨率（SSR）下可以实现更小的最小可测应变（MMS），或者在相同的MMS下实现更小的SSR。在我们的实验中，使用RC SMF的系统在SSR为4.5 cm时可以实现15 μstrain的MMS，或者在SSR为18 cm时实现3 μstrain的MMS。