Sawblade Vibration Mode Shape Measurement Using ESPI

    Volume 36, Issue 3 (May 2008)

    ISSN: 0090-3973


    Published Online: 4 February 2008

    Page Count: 5

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

    Steinzig, Michael
    Technical Bias, Los Alamos, NM

    (Received 24 August 2007; accepted 12 December 2007)


    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.

    Paper ID: JTE101415

    DOI: 10.1520/JTE101415

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