Volume 36, Issue 3 (May 2008)

    Sawblade Vibration Mode Shape Measurement Using ESPI

    (Received 24 August 2007; accepted 12 December 2007)

    Published Online: 2008


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    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.

    Author Information:

    Schajer, Gary S.
    University of British Columbia, Department Mechanical Engineering, Vancouver BC,

    Steinzig, Michael
    Technical Bias, Los Alamos, NM

    Stock #: JTE101415

    ISSN: 0090-3973

    DOI: 10.1520/JTE101415

    ASTM International is a member of CrossRef.

    Title Sawblade Vibration Mode Shape Measurement Using ESPI
    Symposium , 0000-00-00
    Committee D07