AN INVESTIGATION OF PSEUDOVIBRATION SIGNALS IN DUAL-BEAM LASER VIBROMETRY

The role of speckles in generating erroneous laser vibrometer signals in the case of a beam undergoing flexural and longitudinal motion is i nvestigated. As illustrated by experimental results, spurious signals, brought about predominantly by flexural motion in this case, can be r emoved by increasing the speckle size at the photodetector plane. The approach can provide a simple but effective remedy to the pseudovibrat ion problem. (C) 1997 American Institute of Physics.