Abstract

We proposed and experimentally demonstrated a high-spatial-resolution distributed acoustic sensor based on time-frequency-multiplexing (TFM) optical frequency domain reflectometry (OFDR). The TFM technique enhances the frequency response of OFDR by multiplexing the time-frequency channels and suppresses the crosstalk in the meantime. Phase demodulation is employed to achieve high sensitivity, and the impact of end effect in OFDR is studied and suppressed by a dedicated linear interpolation. In the results, a 10.5 kHz vibration is measured with 22 cm spatial resolution and 20 dB signal-to-noise ratio on a 1 km fiber. By adjusting the parameters, the system also shows a good DAS performance on a 33 kHz vibration with up to 200 kHz sampling rate.

© 2023 Optica Publishing Group

High-spatial-resolution fiber-optic distributed acoustic sensor based on Φ-OFDR with enhanced crosstalk suppression

He Li, Qingwen Liu, Dian Chen, Yuanpeng Deng, and Zuyuan He
Opt. Lett. 45(2) 563-566 (2020)

High spatial resolution distributed fiber strain sensor based on phase-OFDR

Jiong Li, Jiulin Gan, Zhishen Zhang, Xiaobo Heng, Changsheng Yang, Qi Qian, Shanhui Xu, and Zhongmin Yang
Opt. Express 25(22) 27913-27922 (2017)

High-spatial-resolution φ-OFDR shape sensor based on multicore optical fiber with femtosecond-laser-induced permanent scatter arrays

Cailing Fu, Yanjie Meng, Lin Chen, Huajian Zhong, Chao Du, Jun He, Xiaoyu Weng, Liwei Liu, Junle Qu, and Yiping Wang
Opt. Lett. 48(12) 3219-3222 (2023)

High-fidelity distributed fiber-optic acoustic sensor with fading noise suppressed and sub-meter spatial resolution

Dian Chen, Qingwen Liu, and Zuyuan He
Opt. Express 26(13) 16138-16146 (2018)

Ultra-linear broadband optical frequency sweep for a long-range and centimeter-spatial-resolution OFDR

Huajian Zhong, Cailing Fu, Pengfei Li, Bin Du, Chao Du, Yanjie Meng, Xiaoyu Yin, Changrui Liao, and Yiping Wang
Opt. Lett. 48(17) 4540-4543 (2023)