Digital recording and numerical reconstruction of holograms for nondestructive testing

Ulf Schnars; Hans-Juergen Hartmann; Werner P. O. Jueptner

doi:10.1117/12.212654

23 June 1995 Digital recording and numerical reconstruction of holograms for nondestructive testing

Ulf Schnars, Hans-Juergen Hartmann, Werner P. O. Jueptner

Proceedings Volume 2545, Interferometry VII: Applications; (1995) https://doi.org/10.1117/12.212654
Event: SPIE's 1995 International Symposium on Optical Science, Engineering, and Instrumentation, 1995, San Diego, CA, United States

Abstract

Digital recording and numerical reconstruction of holograms is a new method of laser metrology: two or more Fresnel holograms, which represent different loading states of the object, are generated directly on a CCD-target and stored electronically. In contrast to speckle interferometry, no lens or other imaging device is used. The reconstruction is done from the digitally stored holograms with numerical methods. For both states, the intensity as well as the phase of the object wave can be calculated in the reconstruction process. This makes it possible to calculate the interference phase directly from the holograms, without generating an interference pattern. In this paper, applications of digital holography in the field of nondestructive testing are presented. A thin-walled pressure vessel (satellite tank) is loaded by changing the internal pressure and the resulting deformation field is measured quantitatively. Defects in the wall become visible as local peaks in the global deformation field.

Citation Download Citation

Ulf Schnars, Hans-Juergen Hartmann, and Werner P. O. Jueptner "Digital recording and numerical reconstruction of holograms for nondestructive testing", Proc. SPIE 2545, Interferometry VII: Applications, (23 June 1995); https://doi.org/10.1117/12.212654

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