A new analysis system for computerbased fringe interpretation is decribed. The principle of the evaluation is based on intensity measurements in the image -plane and a combined phase shift technique. The evaluation technique offers some essential advantages.-suitable for CW-and Pulse -Laser -data evaluation by optical preprocessing and an image an-lyzing system -digitizing of the interferogram in up to 512 x 512 picture elements with 2.56 grey levels -calculation of the object -deformation or the vibration amplitude for the complete image with high accuracy -no sign ambiguity -help text supported user -software The data output is made in coordinates, in false colour graphics and in pseudo 3D-plots. The applications are demonstrated on vibration modes of automobile components, excited by running engines with the aim of noise reduction, on deformation analysis of static problems and on non destructive tested parts.
SPIEVol. 599 Optics in Engineering Measurement (1985] / 97 Downloaded From: http://proceedings.spiedigitallibrary.org/ on 06/22/2016 Terms of Use: http://spiedigitallibrary.org/ss/TermsOfUse.aspx
Optical measuring systems, such as holographic interferometry, speckle interferometry and speckle correlation make it possible to achieve the graphic, 3-dimensional surface area and very accurate measurement of deformations and vibration amplitudes. These systems are suitable tools for the optimising of construction features.
OPTIMISING OF CONSTRUCTIONSThe spectrum of uses ranges from static loading up to the examining of dynamic processes, e.g. vibration analyses.The following examples should give an insight into what is possible with this system, and what information it could provide the constructor with about his construction part.Using the example of an industrial machine, the tracing of a structural weak spot should be described. In the sewing of thin materials at maximum speed, faulty stitches were detected at regular intervals. As this problem does not occur at other speeds, it is assumed that the cause lies with vibrations dependant on the number of revolutions of the whole machine or of the individual machine parts. 240 / SPIE Vol. 1553 Laser Interferometry IV Computer-Aided /nterferometry(1991) 0-8194-0681 -3/92/$4.O0 Downloaded From: http://proceedings.spiedigitallibrary.org/ on 07/12/2015 Terms of Use: http://spiedl.org/terms
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