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Proceedings Paper

Panoramic Holocamera For Tube And Borehole Inspection
Author(s): Pal Greguss
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Paper Abstract

Examination of interior of cavities by holographic and/or speckle interferometry has been until recently of limited success because they all were based on conventional endo-scope principles, and, as a consequence, they had a restricted field of view. Cylindrical hologram recording techniques reconstruct images only from targets being inside, and not outside of the cylindrically folded recording medium, thus, the inner surface of the cavity cannot be measured by this technique. Using PDL optics developed at our laboratory the recorded cylindrical hologram reconstructs the entire inside of the cavity, thus, a 360° panoramic view of the interference fringes may be observed on the inside wall if double exposure technique was used, but even real-time holographic interferometry could be performed.

Paper Details

Date Published: 28 October 1987
PDF: 7 pages
Proc. SPIE 0699, Laser and Opto-Electronic Technology in Industry: State-of-the-Art Review, (28 October 1987); doi: 10.1117/12.936919
Show Author Affiliations
Pal Greguss, Technical University Budapest (Hungary)

Published in SPIE Proceedings Vol. 0699:
Laser and Opto-Electronic Technology in Industry: State-of-the-Art Review
Jingtang Ke; Ryszard J. Pryputniewicz, Editor(s)

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