Abstract
This paper presents a dynamic laser speckle method for directly measuring the relative velocity between two contact or adjacent objects. It has been demonstrated that the relative velocity can be determined by the utilisation of interference of the dynamic speckles produced by two moving objects illuminated by one or two laser beam(s). A theoretical analysis unveils the relationship between the relative velocity and the auto-correlation of the photo-current signal produced by a detector. Experiments for verifying the proposed method are carried out and the test results are presented. Further development of the method is also discussed.
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