Digital holographic interferometry for shape and vibration analysis

Hans J. Tiziani; Giancarlo Pedrini

doi:10.1117/12.269829

20 March 1997 Digital holographic interferometry for shape and vibration analysis

Hans J. Tiziani, Giancarlo Pedrini

Proceedings Volume 2921, International Conference on Experimental Mechanics: Advances and Applications; (1997) https://doi.org/10.1117/12.269829
Event: International Conference on Experimental Mechanics: Advances and Applications, 1996, Singapore, Singapore

Abstract

Different arrangements for digital double-pulsed holographic interferometry for vibration analysis and shape measurement will be described. For vibration measurement using digital double pulse holographic interferometry, two separate holograms of an object under test are recorded within a few microseconds using a CCD-camera and stored in a frame grabber. The phases of the two reconstructed wave fields are calculated from the complex amplitudes which are obtained by digital reconstruction of the wavefront produced by the hologram. The deformation is obtained from the phase difference. In the image plane hologram the phase can be calculated by using the sinusoid-fitting method or the Fourier method. Using three directions of illumination and one direction of observation, all the information necessary for the reconstruction of the three-dimensional deformation vector can be recorded at the same time. Digital holographic interferometry can be used as well to determine the shape of an object.

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Hans J. Tiziani and Giancarlo Pedrini "Digital holographic interferometry for shape and vibration analysis", Proc. SPIE 2921, International Conference on Experimental Mechanics: Advances and Applications, (20 March 1997); https://doi.org/10.1117/12.269829

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KEYWORDS

Holograms

Digital holography

Holographic interferometry

Vibrometry

3D image reconstruction

Charge-coupled devices

CCD cameras

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