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We present a novel architecture of dynamic-speckles distance sensors with a micro-electro-mechanical system (MEMS) deflecting mirror for surface scanning. Since the MEMS mirror deflects the beam sinusoidally, the speed of scanning varies during the scan leading to sufficient variations in the signal frequency which is used to evaluate the distance to the object. Nevertheless, this feature does not...
We present an analysis of statistical properties of dynamic speckles to estimate the limiting accuracy of measurements achievable in a distance sensor using spatially filtered dynamic speckles. The main reason for inaccurate measurements using dynamic speckles is their stochastic nature. It is shown that the average lifetime of dynamic speckles is the key factor defining the measurement accuracy....
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