A Dual Plate Thermoplastic Recording Device For Holographic Interferometry

Holly L. Umstatter; James E. Craig; James D. Trolinger; George Lee

doi:10.1117/12.936746

8 December 1986 A Dual Plate Thermoplastic Recording Device For Holographic Interferometry

Holly L. Umstatter, James E. Craig, James D. Trolinger, George Lee

Proceedings Volume 0693, High Speed Photography, Videography, and Photonics IV; (1986) https://doi.org/10.1117/12.936746
Event: 30th Annual Technical Symposium, 1986, San Diego, United States

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.

Citation Download Citation

Holly L. Umstatter, James E. Craig, James D. Trolinger, and George Lee "A Dual Plate Thermoplastic Recording Device For Holographic Interferometry", Proc. SPIE 0693, High Speed Photography, Videography, and Photonics IV, (8 December 1986); https://doi.org/10.1117/12.936746

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