Use of endoscopes in pulsed digital holographic interferometry

Giancarlo Pedrini; Staffan Schedin; I. Alexeenko; Hans J. Tiziani

doi:10.1117/12.445572

3 October 2001 Use of endoscopes in pulsed digital holographic interferometry

Giancarlo Pedrini, Staffan Schedin, I. Alexeenko, Hans J. Tiziani

Proceedings Volume 4399, Optical Measurement Systems for Industrial Inspection II: Applications in Production Engineering; (2001) https://doi.org/10.1117/12.445572
Event: Lasers in Metrology and Art Conservation, 2001, Munich, Germany

Abstract

A system based on digital holographic interferometry in combination with an endoscope is described. A Q-switched pulsed laser is used. Two digital holograms of the test object, corresponding to the two laser pulse, 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 the object undergoes a deformation, a fringe pattern will result from the difference between the two holograms. This fringe pattern has the information needed to quantitatively evaluate the amount of the deformation. A compact system has 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 result 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 reflect well the light and some other absorb it. A comparison of different endoscopes as object image carrier in pulsed digital holography is presented.

Citation Download Citation

Giancarlo Pedrini, Staffan Schedin, I. Alexeenko, and Hans J. Tiziani "Use of endoscopes in pulsed digital holographic interferometry", Proc. SPIE 4399, Optical Measurement Systems for Industrial Inspection II: Applications in Production Engineering, (3 October 2001); https://doi.org/10.1117/12.445572

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