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首页> 外文期刊>Applied optics >Simultaneous measurement of velocity and length of moving surfaces by a speckle velocimeter with two self-mixing laser diodes
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Simultaneous measurement of velocity and length of moving surfaces by a speckle velocimeter with two self-mixing laser diodes

机译：带有两个自混合激光二极管的散斑测速仪同时测量运动表面的速度和长度

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摘要

A novel laser speckle velocimeter with two self-mixing laser diodes (SM-LD's) for velocity and length measurements of moving surfaces is reported. The mean frequency of the speckle signal obtained in the measurement system depends on the surface path illuminated by the SM-LD. This behavior of the speckle signal in the SM-LD's is exploited to detect the front and the end edges of a target surface by sampling continuously the number of intensity changes in a speckle signal waveform. Once the edges are determined, the velocity and the length of the surface are calculated easily. The error for length and velocity measurements of a target with a homogeneous rough plane surface of 60-mm length, moving at a velocity of 200 mm/s, can be as low as 2.1% and 1.75%, respectively.
机译：报道了一种新颖的激光散斑测速仪，带有两个自混合激光二极管（SM-LD），用于测量运动表面的速度和长度。在测量系统中获得的斑点信号的平均频率取决于SM-LD照射的表面路径。通过连续采样散斑信号波形中强度变化的数量，SM-LD中散斑信号的这种行为被用来检测目标表面的前边缘和端边缘。一旦确定了边缘，就可以轻松计算出表面的速度和长度。以200 mm / s的速度移动的具有60 mm长的均匀粗糙平面表面的目标的长度和速度测量误差分别可以低至2.1％和1.75％。

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