Measurement of object vibrations using the theory of speckle pattern decorrelation

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This paper deals with noncontact measurement of object vibrations using the theory of speckle decorrelation based on the statistical properties of a speckle pattern propagating through free-space and image field. It concentrates on the object vibrations in the direction of the normal to the object surface plane. It follows a paper published in this journal, which presented the theory and experimental results of measurement of an object in-plane and normal rotations by means of the theory of speckle pattern decorrelation. First the basic relations for free-space and image field are introduced, next an experimental arrangement for the measurement of the normal vibrations of an object with a rough surface is designed. Finally, experimental results for some harmonic and anharmonic object vibrations are presented.

Keywords: Speckle; decorrelation; normal vibratio

Document Type: Original Article


Affiliations: Joint Laboratory of Optics, Palacky University and Institute of Physics of the Czech Academy of Sciences, 17. listopadu 50, 77207 Olomouc, Czech Republic

Publication date: June 1, 2002

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