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 language | English |
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Article number | 8887249 |
Pages (from-to) | 946-952 |
Number of pages | 7 |
Journal | Journal of Lightwave Technology |
Volume | 38 |
Issue number | 4 |
DOIs | |
State | Published - 15 Feb 2020 |
Externally published | Yes |
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.
Funders | Funder number |
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NationalNatural Science Foundation of China | |
National Natural Science Foundation of China | 61575052 |
National Key Scientific Instrument and Equipment Development Projects of China | 2017YFF0108700 |
Keywords
- Brillouin optical time-domain reflectometry
- dynamic strain measurement
- frequency-agile technique
- spontaneous Brillouin scattering