Vibration Analysis And Deformation Measurements At High Temperature By TV-Holography

Jan T. Malmo; Ole J. Lokberg

doi:10.1117/12.962753

25 April 1990 Vibration Analysis And Deformation Measurements At High Temperature By TV-Holography

Jan T. Malmo, Ole J. Lokberg

Proceedings Volume 1162, Laser Interferometry: Quantitative Analysis of Interferograms: Third in a Series; (1990) https://doi.org/10.1117/12.962753
Event: 33rd Annual Technical Symposium, 1989, San Diego, United States

Abstract

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.

Citation Download Citation

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); https://doi.org/10.1117/12.962753

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