Experimental study on minimum resolvable velocity for heterodyne laser Doppler vibrometry  

作　　者：尚建华 赵曙光 贺岩 陈卫标 贾宁 

机构地区：[1]School of Information Science and Technology,Donghua University [2]Key Laboratory Space Laser Communication and Testing Technology,Chinese Academy of Sciences [3]Institute of Acoustics,Chinese Academy of Sciences

出　　处：《Chinese Optics Letters》2011年第8期31-33,共3页中国光学快报（英文版）

基　　金：supported in part by the Doctoral Candidate Innovation Research Support Program of the Science & Technology Review of China(No.kjdb200902-4);the Fundamental Research Funds for the Central University of China(No.11D10405)

摘　　要：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-ram 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.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-ram 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.

关 键 词：CLASSIFIERS Doppler effect Fiber lasers HETERODYNING Uncertainty analysis VELOCITY Vibration measurement 

分 类 号：TN247[电子电信—物理电子学]