28 October 1987 Panoramic Holocamera For Tube And Borehole Inspection
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Proceedings Volume 0699, Laser and Opto-Electronic Technology in Industry: State-of-the-Art Review; (1987) https://doi.org/10.1117/12.936919
Event: Laser and Opto-Electronic Technology in Industry: State of the Art Review, 1986, Xiamen, China
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.
© (1987) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Pal Greguss, Pal Greguss, } "Panoramic Holocamera For Tube And Borehole Inspection", Proc. SPIE 0699, Laser and Opto-Electronic Technology in Industry: State-of-the-Art Review, (28 October 1987); doi: 10.1117/12.936919; https://doi.org/10.1117/12.936919
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