23 October 2001 Endoscopic electronic-speckle-pattern interferometry: application to nondestructive quality control in industry and medicine
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Abstract
The method of endoscopic electronic-speckle-pattern interferometry (ESPI) is a tool for detection and visualization of deformations and movements in technical cavities as well as for non-destructive minimal invasive diagnostics within body cavities. Here, a spacial phase shifting (SPS) method is chosen for additional setup and the investigated specimen in comparison to temporal phase shifting techniques. With a simple arrangement, the SPS technique is adapted to the special conditions of standard endoscopic optical imaging. The characterization and optimization of the interferometer is carried out on technical specimen. To demonstrate possible applications of endoscopic ESPI and spatial phase shifting endoscopic (ESPI) on biological tissues, non-destructive investigations of biological heart valve prostheses are performed. The quality of the obtained phase difference fringes is sufficient for phase unwrapping and for visualization as well as quantitative evaluation. In conclusion, the results of the investigations show that it is possible to detect structural differences in tissues underneath the visible surface by application of SPS endoscopic ESPI even of biological specimen with a wet and low reflecting surface.
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Bjorn Kemper, Bjorn Kemper, Jochen Kandulla, Jochen Kandulla, Sabine Knoche, Sabine Knoche, Dieter Dirksen, Dieter Dirksen, Gert von Bally, Gert von Bally, } "Endoscopic electronic-speckle-pattern interferometry: application to nondestructive quality control in industry and medicine", Proc. SPIE 4398, Optical Measurement Systems for Industrial Inspection II: Application in Industrial Design, (23 October 2001); doi: 10.1117/12.445548; https://doi.org/10.1117/12.445548
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