Video/Computer Techniques for Static and Dynamic Experimental Mechanics

Gene E. Maddux

doi:10.1117/12.939763

10 September 1987 Video/Computer Techniques for Static and Dynamic Experimental Mechanics

Gene E. Maddux

Proceedings Volume 0746, Industrial Laser Interferometry; (1987) https://doi.org/10.1117/12.939763
Event: OE LASE'87 and EO Imaging Symposium, 1987, Los Angeles, CA, United States

Abstract

Recent advances in video camera and processing technology, coupled with the development of relatively inexpensive but powerful mini- and micro-computers are providing new capabilities for the experimentalist. This paper will present an overview of current areas of application and an insight into the selection of video/computer systems. The application of optical techniques for most experimental mechanics efforts involves the generation of fringe patterns that can be related to the response of an object to some loading condition. The data reduction process may be characterized as a search for fringe position information. These techniques include methods such as holographic interferometry, speckle metrology, moire, and photoelasticity. Although considerable effort has been expended in developing specialized techniques to convert these patterns to useful engineering data, there are particular advantages to the video approach. Other optical techniques are used which do not produce fringe patterns. Among these is a relatively new area of video application; that of determining the time-history of the response of a structure to dynamic excitation. In particular, these systems have been used to perform modal surveys of large, flexible space structures which make the use of conventional test instrumentation difficult, if not impossible. Video recordings of discrete targets distributed on a vibrating structure can be processed to obtain displacement, velocity, and acceleration data.

Citation Download Citation

Gene E. Maddux "Video/Computer Techniques for Static and Dynamic Experimental Mechanics", Proc. SPIE 0746, Industrial Laser Interferometry, (10 September 1987); https://doi.org/10.1117/12.939763

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