Optical Correlations With Spatially And Temporally Incoherent Light

Alain Lacourt

doi:10.1117/12.958868

22 August 1980 Optical Correlations With Spatially And Temporally Incoherent Light

Alain Lacourt

Proceedings Volume 0232, 1980 Intl Optical Computing Conf II; (1980) https://doi.org/10.1117/12.958868
Event: 1980 Technical Symposium East, 1980, Washington, D.C., United States

Abstract

The use of white light in association with dispersive devices (prisms or gratings) leads to optical processing systems, specially correlators, that does not require hologram filters. Yet, the luminosity and the S/N ratio in the output plane are very high. We achieved a correlator from two spectroscopes in cascade. The first of them is illuminated by a spatially and temporally (white) incoherent object distribution, F(x,y), the different monochromatic images of which are shifted with respect each other. These shifted images scans the input transparency G(x,y) of the 2nd spectroscope. The convolution or correlation product ; F(x,y) * G(x/a,y) appears as an image at the output plane of the set-up (a denotes an arbitrary constant, depending on several geometrical parameters of the set-up). F(x,y) can be a real, self luminous, moving object and also G(x,y) can be a moving transparency (e.g cine film). One can use active components in the correlator (feedback). Examples are shown illustrating the ability of performing multichannel and space-variant processes.

Citation Download Citation

Alain Lacourt "Optical Correlations With Spatially And Temporally Incoherent Light", Proc. SPIE 0232, 1980 Intl Optical Computing Conf II, (22 August 1980); https://doi.org/10.1117/12.958868

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