Share Email Print

Proceedings Paper

Vibration measurements of hidden object surfaces by using holographic endoscopes
Author(s): Giancarlo Pedrini; I. Alexeenko; Mikhail E. Gusev; Hans J. Tiziani
Format Member Price Non-Member Price
PDF $17.00 $21.00

Paper 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.

Paper Details

Date Published: 22 May 2002
PDF: 8 pages
Proc. SPIE 4827, Fifth International Conference on Vibration Measurements by Laser Techniques: Advances and Applications, (22 May 2002); doi: 10.1117/12.468149
Show Author Affiliations
Giancarlo Pedrini, Univ. Stuttgart (Germany)
I. Alexeenko, Kaliningrad State Univ. (Russia)
Mikhail E. Gusev, Kaliningrad State Univ. (Russia)
Hans J. Tiziani, Univ. Stuttgart (Germany)

Published in SPIE Proceedings Vol. 4827:
Fifth International Conference on Vibration Measurements by Laser Techniques: Advances and Applications
Enrico Primo Tomasini, Editor(s)

© SPIE. Terms of Use
Back to Top
Sign in to read the full article
Create a free SPIE account to get access to
premium articles and original research
Forgot your username?