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.© (1997) COPYRIGHT SPIE--The International Society for Optical Engineering. Downloading of the abstract is permitted for personal use only.
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