Abstract
A speckle velocimeter exploiting the effects of external opticalfeedback in a semiconductor laser is analysed. The laser diode is used both asthe light source and as the detector making the system self-detecting andself-aligning with a single optical axis. The velocimeter employs anautocorrelation method to analyse the detected self-mixing speckle signal. Thelinear relation between the velocity and the reciprocal of the autocorrelationtime of fluctuations in the amplitude of the speckle signal allows thedetermination of the velocity. Effects of various parameters of themeasurement system are analysed and the dependences of the reproducibility andaccuracy of the measurements on these parameters are discussed in order toachieve optimization of the system. The optimized system has a measurementerror of less than 1.4% within the range of calibration velocities and lessthan 2.7% outside this range.
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