High-sensitivity dynamic distributed pressure sensing with frequency-scanning φ-OTDR

Liqiang Qiu, Dexin Ba, Dengwang Zhou, Qi Chu, Zongda Zhu, Yongkang Dong

Research output: Contribution to journalArticlepeer-review

9 Scopus citations

Abstract

We propose a high-sensitivity dynamic distributed pressure sensor using frequency-scanning phase-sensitive optical time-domain reflectometry (ϕ-OTDR) in a single-mode fiber (SMF), where an injection locking laser working as both filter and amplifier is used to generate the multi-frequency signals under a double-sideband modulation. The pressure sensitivity of the SMF is measured to be 702.5 MHz/MPa, which is approximately 1000 times larger than that of the Brillouin optical time-domain analysis technique. Subsequently, a dynamic pressure experiment is carried out in the case of rapid pressure relief from 2 to 0 MPa so that a maximum sampling rate of 33.3 kHz for a 25-m SMF is achieved, and the measurement uncertainty of 0.61 kPa for the proposed scheme is demonstrated.

Original languageEnglish
Pages (from-to)965-968
Number of pages4
JournalOptics Letters
Volume47
Issue number4
DOIs
StatePublished - 15 Feb 2022
Externally publishedYes

Bibliographical note

Publisher Copyright:
© 2022 Optical Society of America

Funding

Funding. National Natural Science Foundation of China (61575052, 62005067, 62075051); National Key Scientific Instrument and Equipment Development Projects of China (2017YFF0108700).

FundersFunder number
National Natural Science Foundation of China61575052, 62005067, 62075051
National Key Scientific Instrument and Equipment Development Projects of China2017YFF0108700

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