ISSN:
1432-0649
Keywords:
PACS: 42.65 H; 42.30; 07.07.D
Source:
Springer Online Journal Archives 1860-2000
Topics:
Physics
Notes:
Abstract. In this article, we demonstrate the capability of a two-beam coupling photorefractive optical novelty filter of detecting changes in the amplitude or phase of optical images. These changes may either be continuous or discrete in time. The performance of the two-beam coupling novelty filter is investigated and expressions for the output contrast corresponding to phase and amplitude changes based on a novel, simple interference model of two-beam coupling are derived. These expressions are verified by experimental results on the novelty contrast, revealing that the amplitude contrast is not described correctly by the commonly accepted coupled-wave theory. The novelty filter was applied to the detection of temporally continuous phase changes provided by a gas flow and moving microscopic objects. A novel scheme for image subtraction is also demonstrated, showing the novelty filter’s ability to detect temporally discrete changes.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1007/s003400050745
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