Combination of Rayleigh scattering and Brillouin scattering for highly sensitive distributed dynamic strain sensing

Xiaomeng Xia; Henan Wang; Shuchen Li; Yue Deng; Yue Yang; Ying Wang; Can Li

doi:10.1117/12.2668441

21 March 2023 Combination of Rayleigh scattering and Brillouin scattering for highly sensitive distributed dynamic strain sensing

Xiaomeng Xia, Henan Wang, Shuchen Li, Yue Deng, Yue Yang, Ying Wang, Can Li

Author Affiliations +

Proceedings Volume 12595, Advanced Fiber Laser Conference (AFL2022); 125951H (2023) https://doi.org/10.1117/12.2668441
Event: Advanced Fiber Laser Conference (AFL2022), 2022, Changsha, China

Abstract

Due to its high sensitivity and fast measurement, the phase-sensitive optical time-domain reflectometer (φ-OTDR) is a good candidate for distributed dynamic strain sensing and has been widely used in intrusion monitoring, geophysical exploration, and other fields. In the case of frequency scan-based φ-OTDR, the phase change is expressed as a shift in the intensity distribution. The correlation between the reference and measured spectra is used for relative strain demodulation, which imposes a limitation on the absolute strain demodulation for continuous measurements. The Brillouin optical time domain analysis (BOTDA) fortunately enables the demodulation of the absolute strain in just one measurement. A combination of φ-OTDR and BOTDA is proposed and demonstrated in this work by using the same set of frequency-scanned optical pulses, and also introducing a frequency-agile technique for fast measurements. Measurements of 9.9 Hz vibrations were made at two different absolute strains (296.7 με and 554.8 με) with a strain range of 500 nε, made possible by integrating Rayleigh and Brillouin information. The submicron strain vibrations were demonstrated by φ-OTDR signals with a high sensitivity of 6.8 nε, while the absolute strains were measured by BOTDA signals with an accuracy of 5.4 με. Thus, the proposed sensor allows dynamic absolute strain measurements with high sensitivity, thus opening the door to new possibilities yet to be explored.

Citation Download Citation

Xiaomeng Xia, Henan Wang, Shuchen Li, Yue Deng, Yue Yang, Ying Wang, and Can Li "Combination of Rayleigh scattering and Brillouin scattering for highly sensitive distributed dynamic strain sensing", Proc. SPIE 12595, Advanced Fiber Laser Conference (AFL2022), 125951H (21 March 2023); https://doi.org/10.1117/12.2668441

ACCESS THE FULL ARTICLE

INSTITUTIONAL
Select your institution to access the SPIE Digital Library.

SELECT YOUR INSTITUTION

PERSONAL
Sign in with your SPIE account to access your personal subscriptions or to use specific features such as save to my library, sign up for alerts, save searches, etc.

PERSONAL SIGN IN

No SPIE Account? Create one

PURCHASE THIS CONTENT

SUBSCRIBE TO DIGITAL LIBRARY

50 downloads per 1-year subscription

Members: $195

Non-members: $335 ADD TO CART

25 downloads per 1 - year subscription

Members: $145

Non-members: $250 ADD TO CART

PURCHASE SINGLE ARTICLE

Includes PDF, HTML & Video, when available

Members: $17.00

Non-members: $21.00 ADD TO CART

PROCEEDINGS
5 PAGES

DOWNLOAD PAPER SAVE TO MY LIBRARY

GET CITATION

RIGHTS & PERMISSIONS

Get copyright permission Get copyright permission on Copyright Marketplace

KEYWORDS

Rayleigh scattering

Vibration

Scattering

Sensors

Demodulation

Fiber Bragg gratings

Geometrical optics

Show All Keywords

Keywords/Phrases

Search In:

Publication Years