Chinese Optics Letters, 2009, 7 (8): 08732, Published Online: Aug. 17, 2009
Laser Doppler vibrometer for real-time speech-signal acquirement Download: 690次
激光多普勒振动计 外差探测 正交解调 280.3340 Laser Doppler velocimetry 060.2840 Heterodyne 070.1170 Analog optical signal processing
Abstract
Laser Doppler vibrometer (LDV) has a potential application prospect in remote sensing. Based on the correlation theories of heterodyne detection, a LDV system with a configuration of all fiber and heterodyne techniques is developed to detect the sound signal through the vibration of glass. Experimental results show that the LDV system has an ability to acquire the real-time speech signal 25 m away through glass. While, the system signal-to-noise ratio (SNR) value decreases with the increase of the glass thickness and the detection distance.
Jianhua Shang, Yan He, Dan Liu, Huaguo Zang, Weibiao Chen. Laser Doppler vibrometer for real-time speech-signal acquirement[J]. Chinese Optics Letters, 2009, 7(8): 08732.