High-sensitivity distributed dynamic strain sensing by combining Rayleigh and Brillouin scattering

The phase-sensitive optical time-domain reflectometry (φ-OTDR) is a good candidate for distributed dynamic strain sensing, due to its high sensitivity and fast measurement, which has already been widely used in intrusion monitoring, geophysical exploration, etc. For the frequency scanning based φ-OT...

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Autores principales:	Wang Benzhang, Ba Dexin, Chu Qi, Qiu Liqiang, Zhou Dengwang, Dong Yongkang
Formato:	article
Lenguaje:	EN
Publicado:	Institue of Optics and Electronics, Chinese Academy of Sciences 2020
Materias:	fiber optics sensor rayleigh scattering brillouin scattering fast measurement Optics. Light QC350-467
Acceso en línea:	https://doaj.org/article/247f4eb75e634b1585d8816a4509e717
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spelling	oai:doaj.org-article:247f4eb75e634b1585d8816a4509e7172021-11-10T09:40:56ZHigh-sensitivity distributed dynamic strain sensing by combining Rayleigh and Brillouin scattering2096-457910.29026/oea.2020.200013https://doaj.org/article/247f4eb75e634b1585d8816a4509e7172020-12-01T00:00:00Zhttp://www.oejournal.org/article/doi/10.29026/oea.2020.200013https://doaj.org/toc/2096-4579The phase-sensitive optical time-domain reflectometry (φ-OTDR) is a good candidate for distributed dynamic strain sensing, due to its high sensitivity and fast measurement, which has already been widely used in intrusion monitoring, geophysical exploration, etc. For the frequency scanning based φ-OTDR, the phase change manifests itself as a shift of the intensity distribution. The correlation between the reference and measured spectra is employed for relative strain demodulation, which has imposed the continuous measurement for the absolute strain demodulation. Fortunately, the Brillouin optical time domain analysis (BOTDA) allows for the absolute strain demodulation with only one measurement. In this work, the combination of the φ-OTDR and BOTDA has been proposed and demonstrated by using the same set of frequency-scanning optical pulses, and the frequency-agile technique is also introduced for fast measurements. A 9.9 Hz vibration with a strain range of 500 nε has been measured under two different absolute strains (296.7με and 554.8 με) by integrating the Rayleigh and Brillouin information. The sub-micro strain vibration is demonstrated by the φ-OTDR signal with a high sensitivity of 6.8 nε, while the absolute strain is measured by the BOTDA signal with an accuracy of 5.4 με. The proposed sensor allows for dynamic absolute strain measurements with a high sensitivity, thus opening a door for new possibilities which are yet to be explored.Wang BenzhangBa DexinChu QiQiu LiqiangZhou DengwangDong YongkangInstitue of Optics and Electronics, Chinese Academy of Sciencesarticlefiber optics sensorrayleigh scatteringbrillouin scatteringfast measurementOptics. LightQC350-467ENOpto-Electronic Advances, Vol 3, Iss 12, Pp 200013-1-200013-8 (2020)
institution	DOAJ
collection	DOAJ
language	EN
topic	fiber optics sensor rayleigh scattering brillouin scattering fast measurement Optics. Light QC350-467
spellingShingle	fiber optics sensor rayleigh scattering brillouin scattering fast measurement Optics. Light QC350-467 Wang Benzhang Ba Dexin Chu Qi Qiu Liqiang Zhou Dengwang Dong Yongkang High-sensitivity distributed dynamic strain sensing by combining Rayleigh and Brillouin scattering
description	The phase-sensitive optical time-domain reflectometry (φ-OTDR) is a good candidate for distributed dynamic strain sensing, due to its high sensitivity and fast measurement, which has already been widely used in intrusion monitoring, geophysical exploration, etc. For the frequency scanning based φ-OTDR, the phase change manifests itself as a shift of the intensity distribution. The correlation between the reference and measured spectra is employed for relative strain demodulation, which has imposed the continuous measurement for the absolute strain demodulation. Fortunately, the Brillouin optical time domain analysis (BOTDA) allows for the absolute strain demodulation with only one measurement. In this work, the combination of the φ-OTDR and BOTDA has been proposed and demonstrated by using the same set of frequency-scanning optical pulses, and the frequency-agile technique is also introduced for fast measurements. A 9.9 Hz vibration with a strain range of 500 nε has been measured under two different absolute strains (296.7με and 554.8 με) by integrating the Rayleigh and Brillouin information. The sub-micro strain vibration is demonstrated by the φ-OTDR signal with a high sensitivity of 6.8 nε, while the absolute strain is measured by the BOTDA signal with an accuracy of 5.4 με. The proposed sensor allows for dynamic absolute strain measurements with a high sensitivity, thus opening a door for new possibilities which are yet to be explored.
format	article
author	Wang Benzhang Ba Dexin Chu Qi Qiu Liqiang Zhou Dengwang Dong Yongkang
author_facet	Wang Benzhang Ba Dexin Chu Qi Qiu Liqiang Zhou Dengwang Dong Yongkang
author_sort	Wang Benzhang
title	High-sensitivity distributed dynamic strain sensing by combining Rayleigh and Brillouin scattering
title_short	High-sensitivity distributed dynamic strain sensing by combining Rayleigh and Brillouin scattering
title_full	High-sensitivity distributed dynamic strain sensing by combining Rayleigh and Brillouin scattering
title_fullStr	High-sensitivity distributed dynamic strain sensing by combining Rayleigh and Brillouin scattering
title_full_unstemmed	High-sensitivity distributed dynamic strain sensing by combining Rayleigh and Brillouin scattering
title_sort	high-sensitivity distributed dynamic strain sensing by combining rayleigh and brillouin scattering
publisher	Institue of Optics and Electronics, Chinese Academy of Sciences
publishDate	2020
url	https://doaj.org/article/247f4eb75e634b1585d8816a4509e717
work_keys_str_mv	AT wangbenzhang highsensitivitydistributeddynamicstrainsensingbycombiningrayleighandbrillouinscattering AT badexin highsensitivitydistributeddynamicstrainsensingbycombiningrayleighandbrillouinscattering AT chuqi highsensitivitydistributeddynamicstrainsensingbycombiningrayleighandbrillouinscattering AT qiuliqiang highsensitivitydistributeddynamicstrainsensingbycombiningrayleighandbrillouinscattering AT zhoudengwang highsensitivitydistributeddynamicstrainsensingbycombiningrayleighandbrillouinscattering AT dongyongkang highsensitivitydistributeddynamicstrainsensingbycombiningrayleighandbrillouinscattering
_version_	1718440084055785472

High-sensitivity distributed dynamic strain sensing by combining Rayleigh and Brillouin scattering

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