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17 July 1996 Measurement of shape and vibration using a single electronic speckle interferometry configuration
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Shape and vibration measurements of structures are required in many automotive product development and manufacturing processes. Optical measurement methods are attractive because they do not require contact with the structure and offer high precision and accuracy. Nevertheless optical techniques also suffer from a number of limitations which prohibit wide application. Typically the object is viewed and illuminated from two different points making objects situated in confined areas difficult to measure. In addition, most optical techniques are not easily scaleable in measurement range. Finally, most shape measurement techniques cannot measure vibration without a change in configuration. This paper presents a single electronic speckle interferometry (ESPI) method to measure both surface shape and vibration. A two-wavelength approach is used to measure shape and a stepped strobed phase technique is employed to measure vibration amplitude and phase. The technique requires only one line of sight to the object and can be scaled to measure surface roughness as well as large surface contours. The technique features the ability to coincidentally measure shape and dynamic behavior for structural design, modification, and optimization. The theory of the technique along with results of an experiment are presented.
© (1996) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Fang Chen, Christopher T. Griffen, Thomas E. Allen, and Gordon M. Brown "Measurement of shape and vibration using a single electronic speckle interferometry configuration", Proc. SPIE 2860, Laser Interferometry VIII: Techniques and Analysis, (17 July 1996);

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