Browsing by Author "Klenk, Jürgen"
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Item Open Access Holography and speckle techniques for real time displacement deformation and vibration analysis(1980) Tiziani, Hans J.; Klenk, Jürgen; Leonhardt, KlausHolographic interferometry and speckle application are powerful techniques for deformation, displacement and vibration analysis especially when they can be applied in real time. Bismuth Silicon Oxide crystals Bi12SiO20 (BSO) were used for real-time deformation, displacement and vibration analysis using holography and "speckle photography". After a short introduction of holographic interferometry for deformation measurement using BSO crystals, speckle applications for deformation, displacement and vibration analysis in real time will be discussed.Item Open Access Real-time displacement and tilt analysis by a speckle technique using Bi12SiO20-crystals(1980) Tiziani, Hans J.; Leonhardt, Klaus; Klenk, JürgenStorage of speckle pattern in real time by means of Bi12SiO20-crystals will be reported. Applying the double exposure technique, deformations, displacements as well as tilts can be analysed. The novel speckle technique displays the Young-interference fringes in quasi real time.Item Open Access Vibration analysis by speckle techniques in real time(1981) Tiziani, Hans J.; Klenk, JürgenVibration analysis in quasi-real time is studied by recording the time-averaged speckle pattern in a bismuth silicon oxide crystal (Bi12SiO20). When the crystal is illuminated with a spherical wave, the spatially structured information from the time-averaged speckle pattern leads to fringes in the Fraunhofer plane. No storage device is required when the appropriate wavelength is chosen for writing and reading out the information. Experimental results will be presented together with a comparison of measurements obtained with a Doppler shift vibrometer.