Ultrahigh-speed distributed Brillouin reflectometry

Yosuke Mizuno; Neisei Hayashi; Hideyuki Fukuda; Kwang Yong Song; Kentaro Nakamura

doi:10.1038/lsa.2016.184

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Ultrahigh-speed distributed Brillouin reflectometry

Original Articles

- Ultrahigh-speed distributed Brillouin reflectometry
- Light: Science & Applications Vol. 5, Issue 4, (2016)
- Affiliations：
  
  1.Institute of Innovative Research, Tokyo Institute of Technology, Midori-ku, Yokohama 226-8503, Japan
  2.Research Center for Advanced Science and Technology, The University of Tokyo, Meguro-ku, Tokyo 153-8904, Japan
  3.Servo Laboratory, FANUC Corporation, Oshino-mura, Yamanashi 401-0597, Japan
  4.Department of Physics, Chung-Ang University, Dongjak-gu, Seoul 06974, Korea
- Author bio：
  
  Y Mizuno, Email: ymizuno@sonic.pi.titech.ac.jp
- Funds：
- DOI：10.1038/lsa.2016.184
  CLC：
- Published：2016-12，
  
  Published Online：30 June 2016，
  
  Received：03 March 2016，
  
  Revised：27 June 2016，
  
  Accepted：29 June 2016
- Accepted：
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Mizuno, Y. et al. Ultrahigh-speed distributed Brillouin reflectometry. Light: Science & Applications, 5, e16184 (2016).
DOI：

Mizuno, Y. et al. Ultrahigh-speed distributed Brillouin reflectometry. Light: Science & Applications, 5, e16184 (2016). DOI： 10.1038/lsa.2016.184.

摘要

Abstract

Optical fibre sensors based on Brillouin scattering have been vigorously studied in the context of structural health monitoring on account of their capacity for distributed strain and temperature measurements. However

real-time distributed strain measurement has been achieved only for two-end-access systems; such systems reduce the degree of freedom in embedding the sensors into structures

and furthermore render the measurement no longer feasible when extremely high loss or breakage occurs at a point along the sensing fibre. Here

we demonstrate real-time distributed measurement with an intrinsically one-end-access reflectometry configuration by using a correlation-domain technique. In this method

the Brillouin gain spectrum is obtained at high speed using a voltage-controlled oscillator

and the Brillouin frequency shift is converted into a phase delay of a synchronous sinusoidal waveform; the phase delay is subsequently converted into a voltage

which can be directly measured. When a single-point measurement is performed at an arbitrary position

a strain sampling rate of up to 100 kHz is experimentally verified by detecting locally applied dynamic strain at 1 kHz. When distributed measurements are performed at 100 points with 10 times averaging

a repetition rate of 100 Hz is verified by tracking a mechanical wave propagating along the fibre. Some drawbacks of this ultrahigh-speed configuration

including the reduced measurement accuracy

lowered spatial resolution and limited strain dynamic range

are also discussed.

关键词

Keywords

Brillouin scatteringdistributed strain and temperature sensinghigh-speed measurementnonlinear opticsoptical fibre sensors

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