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Proceedings Paper

Interferometric examination of the vibration modes on stretchable plastic membrane imaging mirrors
Author(s): Peter Waddell; Mathew Stickland; Steven Mason; Stuart McKay; Leslie S. Mair
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Paper Abstract

The paper describes a simple interferometer which has been used to visualize the airborne noise induced, low frequency, very small amplitude, vibrations on thin plastic membrane mirrors. Plastic membrane concave imaging mirrors are the patented invention of the first named author and have been the subject of papers since 1983. The mirrors have already been used for inexpensive large aperture flow visualization systems and the transfer of images in holography. The mirrors are being used currently for high definition, natural color large aperture stereoscopy and self focused real imaging with no spectator glasses, i.e., 3D imaging systems. As the mirror diameter increases for the same type and thickness of membrane material then the fundamental resonant frequency decreases. For very large diameters the mirrors become susceptible to aerial noise of a few Hertz, this being equal to the fundamental resonant frequency. For the small mirror tested for this paper, the fundamental resonance was approximately 600 Hz. The mirror was, however, continually vibrating due to aerial room noise frequencies of between 1 Hz and 20 Hz. No proper nodal patterns can be seen, these only occur at frequencies above the fundamental. The vibrations are extremely small, requiring an interferometer to visualize and record amplitude and frequency. The vibration energy can be destroyed by several techniques. The mirrors have already been used for long exposure white light reflection holograms, effectively no vibrations at all on the mirror surface, achieved by destroying the vibration energy.

Paper Details

Date Published: 20 December 1996
PDF: 9 pages
Proc. SPIE 2951, Holographic and Diffractive Techniques, (20 December 1996); doi: 10.1117/12.262422
Show Author Affiliations
Peter Waddell, Univ. of Strathclyde (United Kingdom)
Mathew Stickland, Univ. of Strathclyde (United Kingdom)
Steven Mason, Univ. of Strathclyde (United Kingdom)
Stuart McKay, Univ. of Strathclyde (United Kingdom)
Leslie S. Mair, Glasgow Caledonian Univ. (United Kingdom)

Published in SPIE Proceedings Vol. 2951:
Holographic and Diffractive Techniques
Guenther J. Dausmann, Editor(s)

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