Vibration measurements of hidden object surfaces by using holographic endoscopes

Giancarlo Pedrini; I. Alexeenko; Mikhail E. Gusev; Hans J. Tiziani

doi:10.1117/12.468149

22 May 2002 Vibration measurements of hidden object surfaces by using holographic endoscopes

Giancarlo Pedrini, I. Alexeenko, Mikhail E. Gusev, Hans J. Tiziani

Proceedings Volume 4827, Fifth International Conference on Vibration Measurements by Laser Techniques: Advances and Applications; (2002) https://doi.org/10.1117/12.468149
Event: Fifth International Conference on Vibration Measurements by Laser Techniques, 2002, Ancona, Italy

Abstract

A system based on digital holographic interferometry in combination with a rigid and a flexible endoscope is described. A Q-switched pulsed laser is used. Two digital holograms of the test object, corresponding to the two laser pulses, are captured at separate video frames of the CCD-camera, transferred in a frame grabber and further processed in a PC. If during the interval between the two laser pulses (usually in the range of 5-600 ?s) the object undergoes a vibration, a fringe pattern will result from the difference between the two holograms. This fringe pattern has the information needed to quantitatively evaluate the vibration. Two compact systems (using rigid and flexible endoscopes) have been developed to be used for many applications, both mechanical and biological, where measurements need to be performed at "hidden" surfaces or inside more or less closed objects. The quality of the results obtained by using mechanical objects is usually better, this can be easily explained by the fact that a biological surface is much more complex, in particular some parts reflects well the light and some other absorb it. Experimental results are presented.

Citation Download Citation

Giancarlo Pedrini, I. Alexeenko, Mikhail E. Gusev, and Hans J. Tiziani "Vibration measurements of hidden object surfaces by using holographic endoscopes", Proc. SPIE 4827, Fifth International Conference on Vibration Measurements by Laser Techniques: Advances and Applications, (22 May 2002); https://doi.org/10.1117/12.468149

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