单纵模VCSEL自混合多普勒测速传感系统的设计  

Design of Doppler Velocity Sensor System Based on Laser Self-mixing Effect in Single-mode Vertical-cavity Surface-emitted Laser

作　　者：徐军[1] 王焕钦[1] 易洁羽[1] 何德勇[1] 赵天鹏[1] 明海[1] 谢建平[1] 

机构地区：[1]中国科学技术大学物理系,合肥230026

出　　处：《半导体光电》2009年第5期748-750,754,共4页Semiconductor Optoelectronics

基　　金：中国科学技术大学青年科学基金项目

摘　　要：基于激光自混合原理研制了多普勒测速传感系统,应用单纵模垂直腔面发射激光器(VCSEL),简化了光路设计;应用差频模拟锁相环技术处理微弱自混合多普勒信号,提高了测速精度和动态范围;应用单片机进行数字采样测量多普勒频移和计算物体的运动速度,实现了传感系统的集成化和小型化。实验结果表明,该传感系统在采样时间为0.1s的条件下,测速精度优于1%,测速范围达到30～500mm/s,具有非接触式测量、测速精度高、动态范围大、结构简单、成本低和易于集成化等优点,在生物工程测量等领域有着广泛的应用前景。The Doppler velocity sensor system based on laser self-mixing effect applies single-longitudinal-mode vertical-cavity surface-emitted laser （VCSEL）, simplifying the optical path. And it uses difference frequency analogy phase locked loop （APLL） to process the self-mixing Doppler signal, so both the velocity measurement accuracy and dynamic range can be improved obviously. And it uses microcontroller unit （MCU） to make digital sampling and measure the Doppler signal frequency to obtain the velocity of the target, realizing the integration and miniaturization of velocity sensor systems. The experimental results show that, with the sampling time of 0. ls, the velocity measurement accuracy is better than 1%, and the dynamic range is from 30mm/s to 500 mm/s. The Doppler velocity sensor system has advantages of nontouch measurement, high accuracy of velocity measurement, wide dynamic range, simple configuration, low cost, and convenience in integration, so it has wide applications in such fields as bioengineering measurement.

关 键 词：单纵模垂直腔面发射激光器 激光自混合效应 多普勒测速 

分 类 号：TN2[电子电信—物理电子学]