Preprint Article Version 1 Preserved in Portico This version is not peer-reviewed

Distributed Acoustic Sensing Based on Coherent Microwave Photonics Interferometry

Version 1 : Received: 11 September 2021 / Approved: 23 September 2021 / Online: 23 September 2021 (17:22:27 CEST)

A peer-reviewed article of this Preprint also exists.

Hua, L.; Zhu, X.; Cheng, B.; Song, Y.; Zhang, Q.; Wu, Y.; Murdoch, L.C.; Dauson, E.R.; Donahue, C.M.; Xiao, H. Distributed Acoustic Sensing Based on Coherent Microwave Photonics Interferometry. Sensors 2021, 21, 6784. Hua, L.; Zhu, X.; Cheng, B.; Song, Y.; Zhang, Q.; Wu, Y.; Murdoch, L.C.; Dauson, E.R.; Donahue, C.M.; Xiao, H. Distributed Acoustic Sensing Based on Coherent Microwave Photonics Interferometry. Sensors 2021, 21, 6784.

Journal reference: Sensors 2021, 21, 6784
DOI: 10.3390/s21206784

Abstract

A microwave-photonics method has been developed for measuring distributed acoustic signals. This method uses microwave-modulated low coherence light as a probe to interrogate distributed in-fiber interferometers, which are used to measure acoustic-induced strain. By sweeping the microwave frequency at a constant rate, the acoustic signals are encoded into the complex microwave spectrum. The microwave spectrum is transformed into the joint time-frequency domain and further processed to obtain the distributed acoustic signals. The method is first evaluated using an intrinsic Fabry Perot interferometer (IFPI). Acoustic signals of frequency up to 15.6 kHz were detected. The method was further demonstrated using an array of in-fiber weak reflectors and an external Michelson interferometer. Two piezo-ceramic cylinders (PCCs) driven at frequencies of 1700 Hz and 3430 Hz were used as acoustic sources. The experiment results show that the sensing system can locate multiple acoustic sources. The system resolves 20 nε when the spatial resolution is 5 cm. The recovered acoustic signals match the excitation signals in frequency, amplitude, and phase, indicating an excellent potential for distributed acoustic sensing (DAS).

Keywords

Fiber optics sensors; Microwave photonics; Interferometry; Distributed acoustic sensing (DAS); optical frequency domain reflectometry (OFDR)

Subject

ENGINEERING, Electrical & Electronic Engineering

Comments (0)

We encourage comments and feedback from a broad range of readers. See criteria for comments and our diversity statement.

Leave a public comment
Send a private comment to the author(s)
Views 0
Downloads 0
Comments 0
Metrics 0


×
Alerts
Notify me about updates to this article or when a peer-reviewed version is published.
We use cookies on our website to ensure you get the best experience.
Read more about our cookies here.