TY - JOUR
T1 - High spatial resolution
T2 - An integrative review of its developments on the Brillouin optical time- And correlation-domain analysis
AU - Wang, Benzhang
AU - Dong, Yongkang
AU - Ba, Dexin
AU - Bao, Xiaoyi
N1 - Publisher Copyright:
© 2020 IOP Publishing Ltd.
PY - 2020
Y1 - 2020
N2 - In the past two decades, Brillouin-based optical fiber sensors have gained significant ground for distributed temperature and strain measurements in the real world. Among these sensors, Brillouin optical time-domain analysis (BOTDA) and Brillouin optical correlation-domain analysis (BOCDA) are good candidates to realize a high spatial resolution, which is of great importance to distinguish small-size events in practical applications. In this paper, high-spatial-resolution BOTDA and BOCDA are introduced and summarized. For the BOTDA, simulation experiments are made for further comprehension of the dark-pulse technique, pulse pre-pump (PPP) technique, differential pulse-width pair (DPP) technique and Brillouin echo technique. The dark-pulse and PPP techniques utilize the DC portion of the pulse signal, which brings the cross talk of the surrounding information. It is known as the non-local information in the Brillouin spectrum, which limits the minimum temperature and strain detection accuracy. The DPP and Brillouin echo techniques, utilizing differential measurement with two pump pulses, are free from this problem. The Brillouin echo-based sensor has a good signal-to-noise ratio, while the DPP-BOTDA owns the advantages of simple installation and easy implementation. For the BOCDA, its operating principle allows it to circumvent the pulse-based limit on the spatial resolution and two specific implementations are introduced, which are enabled by the frequency and phase modulation techniques. A brief overview of the developments and improvements on these two types of BOCDA sensor are introduced and summarized.
AB - In the past two decades, Brillouin-based optical fiber sensors have gained significant ground for distributed temperature and strain measurements in the real world. Among these sensors, Brillouin optical time-domain analysis (BOTDA) and Brillouin optical correlation-domain analysis (BOCDA) are good candidates to realize a high spatial resolution, which is of great importance to distinguish small-size events in practical applications. In this paper, high-spatial-resolution BOTDA and BOCDA are introduced and summarized. For the BOTDA, simulation experiments are made for further comprehension of the dark-pulse technique, pulse pre-pump (PPP) technique, differential pulse-width pair (DPP) technique and Brillouin echo technique. The dark-pulse and PPP techniques utilize the DC portion of the pulse signal, which brings the cross talk of the surrounding information. It is known as the non-local information in the Brillouin spectrum, which limits the minimum temperature and strain detection accuracy. The DPP and Brillouin echo techniques, utilizing differential measurement with two pump pulses, are free from this problem. The Brillouin echo-based sensor has a good signal-to-noise ratio, while the DPP-BOTDA owns the advantages of simple installation and easy implementation. For the BOCDA, its operating principle allows it to circumvent the pulse-based limit on the spatial resolution and two specific implementations are introduced, which are enabled by the frequency and phase modulation techniques. A brief overview of the developments and improvements on these two types of BOCDA sensor are introduced and summarized.
KW - distributed optical fiber sensors
KW - high spatial resolution
KW - stimulated Brillouin scattering
UR - http://www.scopus.com/inward/record.url?scp=85081964855&partnerID=8YFLogxK
U2 - 10.1088/1361-6501/ab5f85
DO - 10.1088/1361-6501/ab5f85
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AN - SCOPUS:85081964855
SN - 0957-0233
VL - 31
JO - Measurement Science and Technology
JF - Measurement Science and Technology
IS - 5
M1 - 052001
ER -