单模VCSEL的自混合传感测振系统  

System on sensing technology utilizing self-mixing effect of VCSEL

作　　者：朱波[1] 王宝光[1] 邵磊[1] 

机构地区：[1]天津大学精密测试技术及仪器国家重点实验室,天津300072

出　　处：《传感器与微系统》2010年第8期104-106,110,共4页Transducer and Microsystem Technologies

基　　金：天津市高等学校科技发展基金资助项目(20070808)

摘　　要：提出了一种基于单模VCSEL的自混合效应的激光测振方法。采用短时傅立叶变换对自混合干涉信号进行频谱分析,同时利用小波变换去奇异点来获取更准确的多普勒频率信息,从而较为准确获得运动物体的速率;并用三角波电流调制技术判别运动方向。经试验证明:位移的误差控制在1%的范围内,实现了振动物体位移的精确测量。A self-mixing laser vibrometer system based on vertical cavity surface emitting laser （VCSEL）is proposed. The short-time Fourier transform is employed to analysis the Doppler signal. While remove singularities by taking advantage of wavelet transformation to obtain accurate Doppler frequency. The direction of motion is determined by technique of triangle-wave current modulation. The error of displacement is within 1% and is realized the precision measurement of the vibration object displacement.

关 键 词：垂直腔面发射激光器 自混合效应 多普勒频移 傅立叶变换 小波变换 三角波电流调制 

分 类 号：TN248.4[电子电信—物理电子学]