21 June 2006 3D endoscopic pulsed digital holography
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Proceedings Volume 6345, Seventh International Conference on Vibration Measurements by Laser Techniques: Advances and Applications; 634507 (2006) https://doi.org/10.1117/12.693108
Event: Seventh International Conference on Vibration Measurements by Laser Techniques: Advances and Applications, 2006, Ancona, Italy
Abstract
A rigid endoscope is used in pulsed digital holography to simultaneously evaluate the three orthogonal displacement components from hidden areas of a harmonically vibrating metallic cylinder. The cylinder is illuminated from three different illuminating directions. The optical path for each illumination direction is matched to its corresponding reference beam, but also in such a way that each object-reference beam pair optical path is mismatched such that they are incoherent and can be stored in a single CCD frame. As is typical in these types of interferometric arrangements, two digital holograms are needed in order to compare two different states of the cylinder. Each hologram is Fourier transformed and due to the incoherence introduced three separate spectra are readily identified, each belonging to a object-reference beam pair. On comparing by subtraction the phase obtained from the two pulsed digital holograms it is possible to gather quantitative 3D results from harmonic displacements.
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T. Saucedo Anaya, T. Saucedo Anaya, F. Mendoza Santoyo, F. Mendoza Santoyo, G. Pedrini, G. Pedrini, W. Osten, W. Osten, } "3D endoscopic pulsed digital holography", Proc. SPIE 6345, Seventh International Conference on Vibration Measurements by Laser Techniques: Advances and Applications, 634507 (21 June 2006); doi: 10.1117/12.693108; https://doi.org/10.1117/12.693108
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