Chinese Optics Letters, 2019, 17 (5): 051201, Published Online: May. 23, 2019
All-fiber pulsed laser Doppler vibrometer development based on time-domain chopping techniques Download: 784次
Abstract
A 1550 nm all-fiber pulsed laser Doppler vibrometer (LDV) based on time-domain chopping techniques is developed to overcome demodulation failures caused by multipath interference. The system adopts an adjustable configuration on pulse duration and pulse repetition frequency according to the distance. An experiment is carried out at a 25 m standoff with pulse duration of 80 ns, single pulse energy of 0.4 nJ, and pulse repetition frequency of 1 MHz. A waveform and spectrogram of the demodulated voice show that the pulsed LDV system has a good performance in long-range voice listening.
Shisong Wu, Yuanyang Li, Tao Lü, Hongkai Chen, Chunhui Yan, Tingfeng Wang, Jin Guo. All-fiber pulsed laser Doppler vibrometer development based on time-domain chopping techniques[J]. Chinese Optics Letters, 2019, 17(5): 051201.