Chinese Optics Letters, 2011, 9 (8): 081201, Published Online: Jun. 1, 2011
Experimental study on minimum resolvable velocity for heterodyne laser Doppler vibrometry 
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激光多普勒测振计 相干外差探测 振动测量 120.7280 Vibration analysis 280.3340 Laser Doppler velocimetry 040.2840 Heterodyne
Abstract
A high spatial resolution, high velocity resolution all-fiber laser Doppler vibrometry (LDV) based on heterodyne detection for vibration measurements is reported. A linewidth of 1-kHz single-mode continuous fiber laser, polarization-preserving fiber, and a telescope with 30-mm aperture are used in this LDV. With the inphase-quadrature circuit and the digital differentiating discriminator, a high velocity resolution of 96.9 nm/s and a high displacement resolution of 2.5 pm are obtained simultaneously with a glass attached to a piezoceramic transducer. These values correspond to the measurement uncertainties of vibration velocity and displacement within 4.14% and 4.6%, respectively.
Jianhua Shang, Shuguang Zhao, Yan He, Weibiao Chen, Ning Jia. Experimental study on minimum resolvable velocity for heterodyne laser Doppler vibrometry[J]. Chinese Optics Letters, 2011, 9(8): 081201.
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