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31 March 1989 Holographic Interferometric Ultrasound Imaging - Technique And Application In Non-Destructive Testing
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Proceedings Volume 1026, Holography Techniques and Applications; (1989)
Event: 1988 International Congress on Optical Science and Engineering, 1988, Hamburg, Germany
Holographic ultrasound imaging is a non-destructive testing method for the detection and description of surface-near flaws. This method is based on the combination of the ultrasonic measuring technique with holographic interferometry. The possibilities of imaging oscillating surfaces by the use of holographic interferometry were already demonstrated shortly after the development of holography /1/. Three different illumination techniques are employed: the time-averaging technique /2/, the stroboscopic technique /3/ and the double-pulse technique. The time-averaging and stroboscopic techniques are performed with the aid of cw-lasers (cw = continuous wave) such as ionized argon lasers. Owing to the relatively low laser power, exposure times lie in the region of seconds so that particular vibrational isolation measures must be taken to realize the required measuring accuracy. This, however, excludes the application of these methods in on-site workshops, and other techniques must be employed, such as the double-pulse technique which has the advantage of rapid and therefore vibration-insensitive imaging.
© (1989) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
H.-A . Crostack, E. H. Meyer, and K . -J . Pohl "Holographic Interferometric Ultrasound Imaging - Technique And Application In Non-Destructive Testing", Proc. SPIE 1026, Holography Techniques and Applications, (31 March 1989);

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