Computer Analysis Of Holographic Interferograms For Nondestructive Testing

D. A. Tichenor; V. P. Madsen

doi:10.1117/12.956749

9 January 1979 Computer Analysis Of Holographic Interferograms For Nondestructive Testing

D. A. Tichenor, V. P. Madsen

Proceedings Volume 0155, Image Understanding Systems and Industrial Applications I; (1979) https://doi.org/10.1117/12.956749
Event: 22nd Annual Technical Symposium, 1978, San Diego, United States

Abstract

Holographic interferometry has been demonstrated to be a useful nondestructive technique with applications, for example, in the inspection of small stainless steel pressure vessels. However, holographic interference patterns can be very complex and difficult to evaluate manually. We have developed an automated technique for interferogram interpretation using a PPP-12 minicomputer, COHU television camera and Hughes scan converter. A digitized image of the interferogram is stored on disc, and a small area is read into central memory. The fringe density in that region is estimated based on the number of peaks found in several line scans across the area under study. This calculation is repeated for successive small areas until a map of fringe density covering the entire part is compiled. If the fringe density map falls within an acceptance profile, the part is accepted. Experimental results demonstrate that this technique works well on interferograms having substantial variations in intensity and fringe contrast.

Citation Download Citation

D. A. Tichenor and V. P. Madsen "Computer Analysis Of Holographic Interferograms For Nondestructive Testing", Proc. SPIE 0155, Image Understanding Systems and Industrial Applications I, (9 January 1979); https://doi.org/10.1117/12.956749

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