Automatic Evaluation Of Interferograms

Friedhelm Becker; Gerd E. A. Meier; Horst Wegner

doi:10.1117/12.965989

17 March 1983 Automatic Evaluation Of Interferograms

Friedhelm Becker, Gerd E. A. Meier, Horst Wegner

Proceedings Volume 0359, Applications of Digital Image Processing IV; (1983) https://doi.org/10.1117/12.965989
Event: 26th Annual Technical Symposium, 1982, San Diego, United States

Abstract

A system for the automatic evaluation of interference patterns has been developed. After digitizing the interferograms from classical and holografic interferometers with a television digitizer and performing different picture enhancement operations the fringe loci are extracted by use of a floating-threshold method. The fringes are numbered using a special scheme after the removal of any fringe disconnections which might appear if there was insufficient contrast in the interferograms. The reconstruction of the object function from the numbered fringe field is achieved by a local polynomial least-squares approximation. Applications are given, demonstrating the evaluation of interferograms of supersonic flow fields and the analysis of holografic interferograms of car-tyres.

Citation Download Citation

Friedhelm Becker, Gerd E. A. Meier, and Horst Wegner "Automatic Evaluation Of Interferograms", Proc. SPIE 0359, Applications of Digital Image Processing IV, (17 March 1983); https://doi.org/10.1117/12.965989

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