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25 April 1990 Vibration Analysis And Deformation Measurements At High Temperature By TV-Holography
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TV-holography is used in vibration analysis and surface inspection of very hot objects. Vibrational behavior (resonant frequencies, phase and amplitude of vibrations) has been studied as a function of increasing temperature. To reduce the effect of turbulence we use continuous averaging of TV-frames. Among typical applications of this technique is the testing of turbine components. We also show some examples of deformation measurements for various temperatures up to about 3000°C. The temperature limits are mainly set by the accessible laser illumination to suppress the background radiation. To block the background radiation we use narrow-band interference filters centered at the laser wavelength.
© (1990) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Jan T. Malmo and Ole J. Lokberg "Vibration Analysis And Deformation Measurements At High Temperature By TV-Holography", Proc. SPIE 1162, Laser Interferometry: Quantitative Analysis of Interferograms: Third in a Series, (25 April 1990);


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