We propose a novel self-mixing laser diode speckle velocimeter based on autocorrelation. The self-mixing laser diode launches and receives reflected light from a moving surface that has a random reflection profile. Some portion of the scattered light backcouples into the laser cavity and causes random intensity variations in the form of speckle signals. These speckle signals obtained from a self-mixing laser diode are processed by use of autocorrelation. The linear relation between the velocity and the reciprocal of the correlation time of the speckle intensity fluctuations allows us to determine the velocity easily if proper calibration is performed. The range of the investigated velocity is 20-450 mm/s. For an aluminum target that moves at a velocity of 350 mm/s, the measurement error is less than 2%.
展开▼
机译：我们提出了一种基于自相关的新型自混合激光二极管散斑测速仪。自混合激光二极管发射并接收来自具有随机反射轮廓的运动表面的反射光。散射光的某些部分回耦合到激光腔中，并以散斑信号的形式引起随机的强度变化。从自混合激光二极管获得的这些斑点信号通过使用自相关进行处理。速度与散斑强度波动的相关时间的倒数之间的线性关系使我们能够轻松地确定速度（如果执行了正确的校准）。研究的速度范围是20-450 mm / s。对于以350 mm / s的速度移动的铝靶，测量误差小于2％。
展开▼
