Single-shot BOTDA based on an optical chirp chain probe wave for distributed ultrafast measurement

Dengwang Zhou; Yongkang Dong; Benzhang Wang; Chao Pang; Dexin Ba; Hongying Zhang; Zhiwei Lu; Hui Li; Xiaoyi Bao

doi:10.1038/s41377-018-0030-0

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Single-shot BOTDA based on an optical chirp chain probe wave for distributed ultrafast measurement

Original Articles

- Single-shot BOTDA based on an optical chirp chain probe wave for distributed ultrafast measurement
- Light: Science & Applications Vol. 7, Issue 4, Pages: 296-306(2018)
- Affiliations：
  
  1.National Key Laboratory of Science and Technology on Tunable Laser, Harbin Institute of Technology, 150001 Harbin, China
  2.Department of Optoelectronic Information, Science and Engineering, Harbin University of Science and Technology, 150080 Harbin, China
  3.School of Civil Engineering, Harbin Institute of Technology, 150001 Harbin, China
  4.Fiber Optics Group, Department of Physics, University of Ottawa, Ottawa, ON K1N 6N5, Canada
- Author bio：
  
  Yongkang Dong (aldendong@gmail.com)
- Funds：
- DOI：10.1038/s41377-018-0030-0
  CLC：
- Published：2018，
  
  Published Online：11 July 2018，
  
  Received：13 September 2017，
  
  Revised：13 April 2018，
  
  Accepted：07 May 2018
- Accepted：
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Zhou, D. W. et al. Single-shot BOTDA based on an optical chirp chain probe wave for distributed ultrafast measurement. Light: Science & Applications, 7, 296-306 (2018).
DOI：

Zhou, D. W. et al. Single-shot BOTDA based on an optical chirp chain probe wave for distributed ultrafast measurement. Light: Science & Applications, 7, 296-306 (2018). DOI： 10.1038/s41377-018-0030-0.

摘要

Abstract

Brillouin optical time-domain analysis (BOTDA) requires frequency mapping of the Brillouin spectrum to obtain environmental information (e.g.

temperature or strain) over the length of the sensing fiber

with the finite frequency-sweeping time-limiting applications to only static or slowly varying strain or temperature environments. To solve this problem

we propose the use of an optical chirp chain probe wave to remove the requirement of frequency sweeping for the Brillouin spectrum

which enables distributed ultrafast strain measurement with a single pump pulse. The optical chirp chain is generated using a frequency-agile technique via a fast-frequency-changing microwave

which covers a larger frequency range around the Stokes frequency relative to the pump wave

so that a distributed Brillouin gain spectrum along the fiber is realized. Dynamic strain measurements for periodic mechanical vibration

mechanical shock

and a switch event are demonstrated at sampling rates of 25 kHz

2.5 MHz and 6.25 MHz

respectively. To the best of our knowledge

this is the first demonstration of distributed Brillouin strain sensing with a wide-dynamic range at a sampling rate of up to the MHz level.

关键词

Keywords

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