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Proceedings Paper

A Dual Plate Thermoplastic Recording Device For Holographic Interferometry
Author(s): Holly L. Umstatter; James E. Craig; James D. Trolinger; George Lee
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Paper Abstract

The creation of surface relief holograms by thermoplastic deformation has proven to be an effective technique for many types of holography. Today, a major application is the field of interferometry. The technology of in situ development has vastly improved real time HI as applied to nondestructive testing and vibration analysis. In this paper, we describe the development of a dual plate holographic interferometer using thermoplastic recording devices. The operational characteristics of the thermoplastic devices are inves-tigated and optimized for fringe contrast and signal-to-noise ratio. The dual plate device is demonstrated in a transonic wind tunnel at NASA Ames Research Center. The interferograms derived from the thermoplastic device were compared with those derived from conventional photographic emulsions. The fringe contrast achieved with the optimized thermoplastic device was equivalent to the contrast achieved with conventional techniques. The operational advantages of in situ development was demonstrated in the wind tunnel environment, where the device was cycled from recorded hologram to reconstructed interferogram, in a few minutes.

Paper Details

Date Published: 8 December 1986
PDF: 11 pages
Proc. SPIE 0693, High Speed Photography, Videography, and Photonics IV, (8 December 1986); doi: 10.1117/12.936746
Show Author Affiliations
Holly L. Umstatter, Spectron Development Laboratories (United States)
James E. Craig, Spectron Development Laboratories (United States)
James D. Trolinger, Spectron Development Laboratories (United States)
George Lee, NASA Ames Research Center (United States)

Published in SPIE Proceedings Vol. 0693:
High Speed Photography, Videography, and Photonics IV
Bernard G. Ponseggi, Editor(s)

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