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 language | English |
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Pages (from-to) | 965-968 |
Number of pages | 4 |
Journal | Optics Letters |
Volume | 47 |
Issue number | 4 |
DOIs | |
State | Published - 15 Feb 2022 |
Externally published | Yes |
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