Optical EngineeringSpeckle correlation method for the real time measurement of motion paths using liquid crystal television
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A speckle correlation method is described in which a liquid crystal television (LCTV) is used as a spatial filter to measure the paths of the lateral motion of rough objects. Two kinds of speckle patterns are generated simultaneously, consisting of speckles elongated in orthogonal directions to each other. The two-dimensional motion vector of the object can be measured in real time by correlating these patterns with static speckle patterns that are displayed on the LCTV as the references. Because these reference patterns can be renewed in real time, there is no limit for a measurable range of the present method. However, the spatial resolution and contrast of the LCTV limit the sensitivity and accuracy of the method.