A New Set of Signal-Processing Algorithms in Laser Speckle Metrology
Sprache des Titels:
Proc. of the 21th IEEE IMTC
Non-contacting methods for strain and displacement measurement are
now well established, although not in very wide spread use in material science
applications. Besides other methods laser speckle pattern
shift techniques can be successfully used for strain and displacement measurements.
Using such a technique one is confronted with the problem of calculating
speckle pattern shift values from a time series of images. In this paper we
present a new set of algorithms based on minimum-mean-square error and
maximum likelihood principles suitable to do this task. We show their
application in two different strain and displacement measurement set-ups.