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Proceedings Paper

Application Of Moire Measuring Methods To Auto Safety Studies
Author(s): Michael A. Tafralian
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Paper Abstract

This paper presents a method of full-field displacement measurement which is very advantageous in auto-safety studies. A linear ruling of parallel lines is projected on the object with an ordinary projector. A view camera completes the apparatus and is used to image the object in its local focal plane. If the object is of arbitrary shape, the image of the ruling becomes "warped" when the camera axis is offset from the projector axis. This "warped" ruling contains information about the object contour which can easily be extracted. Superposition of a linear ruling with the warped ruling yields absolute contour information directly. Superposition of two warped rulings yield contour difference information. The latter process may be conventionally used for studies of deformations due to impact. Examples dealing with knee impact upon instrument panels will be shown. The sensitivity of the method may be varied over a wide range and the need for extreme degrees of vibration isolation is eliminated.

Paper Details

Date Published: 20 May 1973
PDF: 6 pages
Proc. SPIE 0034, Solving Problems in Automotive Safety Engineering and Biomechanics with Optical Instrumentation, (20 May 1973); doi: 10.1117/12.953649
Show Author Affiliations
Michael A. Tafralian, Oakland University (United States)

Published in SPIE Proceedings Vol. 0034:
Solving Problems in Automotive Safety Engineering and Biomechanics with Optical Instrumentation
Paul Brown; Lawrence M. Patrick, Editor(s)

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