CCD recording and numerical reconstruction of holograms and holographic interferograms

Ulf Schnars; Thomas M. Kreis; Werner P. O. Jueptner

doi:10.1117/12.211890

14 June 1995 CCD recording and numerical reconstruction of holograms and holographic interferograms

Ulf Schnars, Thomas M. Kreis, Werner P. O. Jueptner

Proceedings Volume 2544, Interferometry VII: Techniques and Analysis; (1995) https://doi.org/10.1117/12.211890
Event: SPIE's 1995 International Symposium on Optical Science, Engineering, and Instrumentation, 1995, San Diego, CA, United States

Abstract

Direct recording of Fresnel holograms on a CCD (charge-coupled device) and their numerical reconstruction is possible, if the maximum spatial frequency of the holographic microstructure is adapted to the spatial resolution of the detector array. The maximum spatial frequency is determined by the angle between the interfering waves. For standard CCDs with spatial resolution of approximately 110 lines/mm the angle between reference and object wave is limited to a few degrees. This limits the size of the objects to be recorded or requires a large distance between object and CCD-target. In this paper a method is described in which the primary object angle is optically reduced, so that objects with larger dimensions can be recorded. The principle is demonstrated at the example of deformation analysis. Two Fresnel holograms, which represent the undeformed and the deformed state of the object, are generated on a CCD-target, stored electronically and the wave fields are reconstructed numerically. It is shown that the interference phase can be calculated directly from the digital holgrams, without generating an interference pattern.

Citation Download Citation

Ulf Schnars, Thomas M. Kreis, and Werner P. O. Jueptner "CCD recording and numerical reconstruction of holograms and holographic interferograms", Proc. SPIE 2544, Interferometry VII: Techniques and Analysis, (14 June 1995); https://doi.org/10.1117/12.211890

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