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Proceedings Paper

Laser Speckle Metrology Using Holo-Lens Imaging System And Its Application In Fracture Mechanics
Author(s): Chandra Shakher; G. Venkata Rao; Heera Lal Yadav; B. N. Gupta
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Paper Abstract

It has already been shown 1,2 that by using proper recording and playback geometries, almost diffraction limited performance in speckle metrology can be achieved over the entire object field which can be imaged by two hololens configuration. Because of the complexities encountered in closed form or numerical solutions in the area of theoretical fracture mechanics, carefully controlled experiment which can provide more accurate data is essential for validating the theoretical results. Therefore use of holographic optics in fracture mechanics has an edge over conventional optics. This paper concentrates on the study of crack opening problem, in a beam specimen having central edge crack subjected to three point bending (Fig.1), using focused plane speckle photography and two holo-lens imaging configuration. Fig. 2 shows the schematic of the typical imaging system used in the experiment. The lenses used in the experiment were all recorded using di vering spherical and plane waves. The recording and play back geometries are discussed elsewhere (See Ref. 2).

Paper Details

Date Published: 1 January 1987
PDF: 2 pages
Proc. SPIE 0813, Optics and the Information Age, (1 January 1987); doi: 10.1117/12.967225
Show Author Affiliations
Chandra Shakher, BHEL Corporate R&D Division (India)
G. Venkata Rao, BHEL Corporate R&D Division (India)
Heera Lal Yadav, Indian Institute of Technology (India)
B. N. Gupta, Indian Institute of Technology (India)

Published in SPIE Proceedings Vol. 0813:
Optics and the Information Age
Henri H. Arsenault, Editor(s)

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