Fast Brillouin Optical Time-Domain Reflectometry Based on the Frequency-Agile Technique

Benzhang Wang, Zijie Hua, Chao Pang, Dengwang Zhou, Dexin Ba, Dianyang Lin, Yongkang Dong

Research output: Contribution to journalArticlepeer-review

26 Scopus citations

Abstract

A fast Brillouin optical time-domain reflectometry (BOTDR) for dynamic strain measurement is proposed and experimentally demonstrated based on the frequency-agile technique. Employing the band-pass filter and envelope detection, the spontaneous Brillouin gain spectrum can be online demodulated in the time domain for a truly distributed, one-end-access and dynamic strain measurement. A strain sampling rate of 62.5 Hz is achieved for the proposed sensor over 172 m single-mode fiber with 100 sweeping frequencies and 64 times of averaging. In the experiment, the vibration frequencies of 6.82 Hz and 14.77 Hz have been measured with 2 m spatial resolution and 4000 μϵ dynamic range. The measurement accuracy is calculated to be ±30 μϵ by the standard deviation of the static fiber Brillouin frequency shift. Furthermore, the performance on the strain sampling rate and measurement accuracy is investigated with different averaging times. It should be noted that the upgraded schemes for the frequency-agile based Brillouin optical time-domain analysis can be also introduced into the proposed fast BOTDR.

Original languageEnglish
Article number8887249
Pages (from-to)946-952
Number of pages7
JournalJournal of Lightwave Technology
Volume38
Issue number4
DOIs
StatePublished - 15 Feb 2020
Externally publishedYes

Bibliographical note

Publisher Copyright:
© 1983-2012 IEEE.

Funding

Manuscript received May 17, 2019; revised July 26, 2019 and October 10, 2019; accepted October 27, 2019. Date of publication October 30, 2019; date of current version February 12, 2020. This work was supported in part by the National Key Scientific Instrument and Equipment Development Project of China 2017YFF0108700 and in part by the National Natural Science Foundation of China 61575052. (Corresponding author: Yongkang Dong.) The authors are with the National Key Laboratory of Science and Technology on Tunable Laser, Harbin Institute of Technology, Harbin 150001, China (e-mail: [email protected]; [email protected]; [email protected]; [email protected]; [email protected]; [email protected]; [email protected]). This work was supported in part by the National Key Scientific Instrument and Equipment Development Project of China 2017YFF0108700 and in part by the NationalNatural Science Foundation of China 61575052.

FundersFunder number
NationalNatural Science Foundation of China
National Natural Science Foundation of China61575052
National Key Scientific Instrument and Equipment Development Projects of China2017YFF0108700

    Keywords

    • Brillouin optical time-domain reflectometry
    • dynamic strain measurement
    • frequency-agile technique
    • spontaneous Brillouin scattering

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