Abstract

This paper reviews and compares two major optical methods for vibration measurement: digital shearography and TV-holography. Digital shearography measures surface displacement derivatives whereas TV-holography measures surface displacements. While both methods enjoy the advantages of being full-field and noncontacting, digital shearography has been proven to be more practical than TV-holography because it employs a simpler setup and does not require special vibration isolation.

Volume Subject Area:
Optical Methods in Vibration and Noise
Topics:
Electronic speckle pattern interferometry, Vibration measurement, Displacement, Vibration isolation
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Copyright © 1995 by The American Society of Mechanical Engineers
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