ISSN: 0090-3973
Page Count: 5

Sawblade Vibration Mode Shape Measurement Using ESPI
Schajer, Gary S.
University of British Columbia, Department Mechanical Engineering,

Steinzig, Michael
Technical Bias, NM

Abstract

Electronic Speckle Pattern Interferometry (ESPI) is used to measure the vibration mode shapes of circular and bandsaws. A video camera views a vibrating sawblade that is illuminated by a laser light. The image within the camera is mixed with a reference light to create an interference pattern. The reference phase is stepped by 180 degrees using a piezoelectric actuator before measuring each successive image. Subtraction of the successive images gives a contour view of the vibration mode of the sawblade. The technique is noncontacting and displays vibration mode shapes in real-time. It has the advantage over the classical Chladni method because it avoids the need to spread a powder over the sawblade surface and because it can also identify low-frequency vibrations.

Keywords:
ESPI, speckle pattern, mode shape, sawblade, Chladni

Paper ID: JTE101415
DOI: 10.1520/JTE101415
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