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Proceedings Paper

Pulsed Holography With Computer Vision For Nondestructive Testing In The Field Environment
Author(s): David L. Mader
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Paper Abstract

Structural integrity could now be assessed in the field environment with static test loads using pulsed holography and computer vision. Previously, we made holograms of pressurized components on a vibration isolation table with a cw laser. Now, they have been obtained without vibration isolation using pulsed ruby or YAG lasers to freeze motion. Instead of viewing the holograms with a separate cw laser as is usually done, the pulsed laser itself was used. A video camera and frame grabber were used to capture the image and hold it between laser pulses for continuous viewing of the image on a monitor. To obtain a fringe pattern which indicates strain, two separate holograms are made for initial and final load conditions and are viewed together, or one hologram is made for the initial condition and is viewed together with the component itself in its instantaneous condition. Techniques to overcome unwanted motion of the component under test are described, so that fringes due to deformation alone can be seen.

Paper Details

Date Published: 16 January 1989
PDF: 13 pages
Proc. SPIE 0954, Optical Testing and Metrology II, (16 January 1989); doi: 10.1117/12.947567
Show Author Affiliations
David L. Mader, Ontario Hydro (Canada)

Published in SPIE Proceedings Vol. 0954:
Optical Testing and Metrology II
Chander Prakash Grover, Editor(s)

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