TY - JOUR
T1 - High-spatial-resolution fast BOTDA for dynamic strain measurement based on differential double-pulse and second-order sideband of modulation
AU - Dong, Yongkang
AU - Ba, Dexin
AU - Jiang, Taofei
AU - Zhou, Dengwang
AU - Zhang, Hongying
AU - Zhu, Chengyu
AU - Lu, Zhiwei
AU - Li, Hui
AU - Chen, Liang
AU - Bao, Xiaoyi
PY - 2013
Y1 - 2013
N2 - We demonstrate a high-spatial-resolution fast Brillouin optical time-domain analysis (BOTDA) for distributed dynamic strain measurement based on differential double-pulse and second-order sideband of modulation. The frequency-agility probe wave is obtained from the second-order sideband of the modulated light by using the microwave signal from a wideband arbitrary waveform generator (AWG), which reduces the bandwidth requirement of the AWG by half to ∼5.5 GHz. The differential double-pulse scheme is proposed to improve the spatial resolution while keeping the capability of dynamic measurement. In experiment, a spatial resolution of 20 cm is achieved by using a 52/50 ns differential double-pulse, and the distributed vibration measurement is demonstrated over a 50-m Panda polarization-maintaining fiber observing the vibration frequency of up to 50 Hz. With only five averages, the standard deviation of the strain accuracy is measured to be 14 μe.
AB - We demonstrate a high-spatial-resolution fast Brillouin optical time-domain analysis (BOTDA) for distributed dynamic strain measurement based on differential double-pulse and second-order sideband of modulation. The frequency-agility probe wave is obtained from the second-order sideband of the modulated light by using the microwave signal from a wideband arbitrary waveform generator (AWG), which reduces the bandwidth requirement of the AWG by half to ∼5.5 GHz. The differential double-pulse scheme is proposed to improve the spatial resolution while keeping the capability of dynamic measurement. In experiment, a spatial resolution of 20 cm is achieved by using a 52/50 ns differential double-pulse, and the distributed vibration measurement is demonstrated over a 50-m Panda polarization-maintaining fiber observing the vibration frequency of up to 50 Hz. With only five averages, the standard deviation of the strain accuracy is measured to be 14 μe.
KW - Brillouin optical time-domain analysis (BOTDA)
KW - dynamic measurement
KW - high spatial resolution
KW - strain measurement
UR - http://www.scopus.com/inward/record.url?scp=84880323528&partnerID=8YFLogxK
U2 - 10.1109/JPHOT.2013.2267532
DO - 10.1109/JPHOT.2013.2267532
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AN - SCOPUS:84880323528
SN - 1943-0655
VL - 5
JO - IEEE Photonics Journal
JF - IEEE Photonics Journal
IS - 3
M1 - 2600407
ER -