Optical modal analysis using white-light projected fringes |
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Authors: | Andrew K Mitchell |
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Institution: | (1) The Ivan Curry School of Engineering, Acadia University, B4P 2R6 Wolfville, Nova Scotia, Canada |
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Abstract: | This paper describes a non-contacting optical technique for vibration measurement, which can be used to determine the magnitude
and phase of every point of a continuous surface under steady-state conditions. In this method, the vibrating surface to be
studied is illuminated by a white-light, sinusoidal grating projected from an oblique angle. A series of precisely timed digital
images of the vibrating object is recorded as the grid is moved across the surface. An automated analysis then extracts magnitude
and phase data at each pixel in the recorded images. The use of white light makes it possible to study the motion of larger
surfaces than might be conveniently possible with more conventional Moiré or holographic techniques, and the optical arrangement
used seems relatively insensitive to external disturbances. The method seems particularly well suited to the study of structures
undergoing relatively low-frequency, large-amplitude vibrations. |
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Keywords: | Vibration analysis projected fringes white light |
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