Patent ID: 6320665
Filing Date: 2001-11-20
Classification: G01B,G01H,G11B

Abstract:
An acousto optic scanning laser vibrometer for measuring a dynamic parameter of an object comprising:a coherent laser beam source of single wavelength and of stabilized frequency, which is split into two orthogonal polarized beams, the first polarized beam striking a surface of an object of investigation and being reflected, the second polarized beam impinging on a reference surface and being reflected, wherein at least one acousto optic deflector is used for scanning the first polarized beam along a measuring path and for scanning the second polarized beam along a reference path;means for combining the beam reflected from the surface of the object of investigation and the beam from the reference surface and causing them to interfere;two photodetectors, at least one photodetector being located at the point of interference, having output signals that are input to a signal processor to obtain the dynamic parameter information; andmeans for providing the information on the dynamic parameters of the object under investigation.