Wide-Dynamic-Range Brillouin Optical Correlation-Domain Reflectometry With 20-kHz Sampling Rate

Guangtao Zhu, Kazuya Kishizawa, Kohei Noda, Heeyoung Lee, Kentaro Nakamura, Yosuke Mizuno

Research output: Contribution to journalArticlepeer-review

Abstract

Brillouin optical correlation-domain reflectometry (BOCDR) is known as one of the distributed fiber-optic strain/temperature sensing techniques. Recently, a high-speed BOCDR configuration with no measurable strain limit has been developed, but only a sampling rate of 50 Hz has been experimentally demonstrated, limited by the use of a commercial microwave frequency sweeper (MFS). In this work, by replacing the MFS with an independent voltage-controlled oscillator driven by a function generator, we experimentally show via vibration detection that this system can achieve a sampling rate of up to 20 kHz. We newly observe the systematic noise peculiar to such high-speed operation, which is found to originate from the unintended intensity modulation of the laser output. We also demonstrate the suppression of this noise by band-elimination filtering.

Original languageEnglish
Pages (from-to)6644-6650
Number of pages7
JournalIEEE Sensors Journal
Volume22
Issue number7
DOIs
Publication statusPublished - 2022 Apr 1

Keywords

  • Brillouin scattering
  • Optical fiber sensors
  • dynamic range
  • high-speed sampling
  • strain sensing

ASJC Scopus subject areas

  • Instrumentation
  • Electrical and Electronic Engineering

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