Research on the theory of valid sampling points in BOTDR technique

Peng Gong; Jian Guo; Yang Liu; Jie Lu; Xuefeng Zhao

doi:10.1117/12.880270

15 April 2011 Research on the theory of valid sampling points in BOTDR technique

Peng Gong, Jian Guo, Yang Liu, Jie Lu, Xuefeng Zhao

Proceedings Volume 7982, Smart Sensor Phenomena, Technology, Networks, and Systems 2011; 798208 (2011) https://doi.org/10.1117/12.880270
Event: SPIE Smart Structures and Materials + Nondestructive Evaluation and Health Monitoring, 2011, San Diego, California, United States

Abstract

Traditionally, distributed BOTDR technique is applied in the field of the structural heath monitoring (SHM) on the large scale. However, if the sensing length is relatively small, the number of valid sampling points on the sensing fiber will be quite limited. Therefore, how to pick out valid sampling points from a large amount of sampling points becomes a key to apply distributed BOTDR technique into the field of small-scale monitoring successfully. This paper presents the concepts of valid sampling points (VSPs), invalid sampling points (ISPs) and useless sampling points (USPs), proposes SRSI Method to select VSPs, derives the error theory of ISPs and analyzes the experimental data by SRSI Method, Peak Method and the error theory of ISPs in the temperature and strain monitoring tests. In the above tests, different sensing lengths of the fiber or spatial resolutions were set for comparison with each other. The test results show that SRSI Method, which can improve the accuracy of the test results effectively, is the better selecting method of VSPs than Peak Method, and especially, the number of VSPs on the sensing fiber is less, the SRSI Method is better. Meanwhile, the error theory of ISPs gives the error bound and a good explanation of the large errors of Peak Method.

Citation Download Citation

Peng Gong, Jian Guo, Yang Liu, Jie Lu, and Xuefeng Zhao "Research on the theory of valid sampling points in BOTDR technique", Proc. SPIE 7982, Smart Sensor Phenomena, Technology, Networks, and Systems 2011, 798208 (15 April 2011); https://doi.org/10.1117/12.880270

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