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

3 Scopus citations


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
Issue number4
StatePublished - 15 Feb 2022
Externally publishedYes

Bibliographical note

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

Publisher Copyright:
© 2022 Optical Society of America


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