Automated compensation of fringe pattern in digital holography and TV holography

János Kornis; Richárd Séfel

doi:10.1117/12.828198

17 June 2009 Automated compensation of fringe pattern in digital holography and TV holography

János Kornis, Richárd Séfel

Proceedings Volume 7389, Optical Measurement Systems for Industrial Inspection VI; 738908 (2009) https://doi.org/10.1117/12.828198
Event: SPIE Europe Optical Metrology, 2009, Munich, Germany

Abstract

Digital holography and TV holography is the most promising tool for industrial applications. For a successful industrial measuring system automated evaluation is necessary. To develop this kind of measuring system the fringe compensation principle can be used. Because both digital holography and TV-holography operate with images recorded with a digital camera, several computer based compensation methods can be applied. In our investigations automated compensation techniques were investigated to develop industrial measuring systems. In digital holography the compensation method can be easier, using digital compensation, performing the compensation process in the computer using the recorded complex amplitude of the scattered light from the investigated object. In this case the compensation is based on the phase manipulation of the reconstructed waves. Digital compensation method was chosen for TV holography too. Previously developed fringe synthesizing method was applied in Tv holographic measurements. In this method a set of phase shifted fringe patterns of the investigated object is recorded. Using the recorded fringe systems new contour fringe pattern can be generated. Based on these methods, the evaluation program in digital holography or in TV holography can set the sensitivity of the measurement, can separate different deformation components (e.g. rotation, local deformation) after the measurement was performed. Measuring the separated deformation components new alternative output of the measurement can be generated: a list of the deformation components with its features.

Citation Download Citation

János Kornis and Richárd Séfel "Automated compensation of fringe pattern in digital holography and TV holography", Proc. SPIE 7389, Optical Measurement Systems for Industrial Inspection VI, 738908 (17 June 2009); https://doi.org/10.1117/12.828198

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