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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 velocimetry sensor system was developed based on the principle of laser self-mixing. The single vertical mode vertical cavity surface emitting laser (VCSEL) was used to simplify the optical path design. The weak frequency self-mixing Doppler signal was processed by phase- Improve the speed accuracy and dynamic range; the application of single-chip digital sampling Doppler frequency shift measurement and calculation of object velocity, the sensor system to achieve the integration and miniaturization. The experimental results show that the sensing system has a speed accuracy of better than 1% with a sampling time of 0.1 s and a speed range of 30 ~ 500 mm / s. The system has the advantages of non-contact measurement, high speed accuracy, large dynamic range and simple structure , Low cost and easy integration, etc. It has a wide range of applications in the field of bioengineering measurement.