Small laser Doppler velocimeter based on the self-mixing effect in a diode laser.
Small laser Doppler velocimeter based on the self-mixing effect in a diode laser.
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DOI：
10.1364/ao.27.000379
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发表时间：
1988-01
期刊：
影响因子：
1.9
通讯作者：
H. Jentink;F. D. de Mul;H. Suichies;J. Aarnoudse;J. Greve
中科院分区：
文献类型：
--
作者：
H. Jentink;F. D. de Mul;H. Suichies;J. Aarnoudse;J. Greve
介绍了一种由半导体激光器组成的非常小而简单的测速仪，其前面有一个梯度折射率透镜。速度测量的基础是当移动物体散射回激光腔内的光与激光器内部的光发生干涉时发生的混合。这种混合引起了激光强度随多普勒频率的大幅波动。这些波动可以通过光电二极管或通过测量半导体激光器两端的电压来检测。作为对速度计性能的说明，描述了用白纸覆盖的旋转圆盘的速度测量。对使用单模和多纵模激光产生的差异进行了计算，并在实验中进行了验证。使用多模激光器的优点是还可以对激光与运动物体之间的距离进行差分测量。
A very small and simple velocimeter is presented consisting of a diode laser with a gradient-index lens in front of it. The basis of the velocity measurement is the mixing that occurs when light, scattered back by the moving object into the laser cavity, interferes with light inside the laser. This mixing induces large fluctuations of the laser intensity with the Doppler frequency. These fluctuations can be detected either with a photodiode or by measuring the voltage across the diode laser. As an illustration of the performance of the velocimeter, velocity measurements of a rotating disk covered with white paper are described. The differences arising because of using a single-mode or a multilongitudinal mode laser were calculated and verified in experiments. The advantage of the use of a multimode laser is that differential measurements of the distance between laser and moving object are also possible.