Phase-only optical filter for use in an optical correlation syst

Details Phase-only optical filter for use in an optical correlation syst Phase-only optical filter for use in an optical correlation syst

1984-04-03

1986-05-13

Corbin, John K.

Boots, shoes, and leggings

364822, 350 382, G02B 2746, G03H 116, G06G 900

Patent

active

045882606

ABSTRACT:
A phase-only optical filter capable of being utilized within a phase-only optical correlation system. The phase-only optical filter is made by mathematically generating preselected phase-only information by a fast Fourier Transform technique. This generated phase-only information is transferred onto an unexposed holographic film. Thereafter, the film is developed and subsequently bleached. The resultant bleached film is the phase-only filter which, when utilized in a correlation system, provides substantially 100% utilization of the source of electromagnetic radiation during the correlation process.

REFERENCES:
patent: 3435244 (1969-03-01), Burckhardt et al.
patent: 3543237 (1970-11-01), Cutler et al.
patent: 3572878 (1971-03-01), Lu
patent: 3580655 (1971-05-01), Leith
patent: 4059343 (1977-11-01), Kowalski et al.
Vander Lugt, "Signal Detection by Complex Spatial Filtering," IEEE Transactions on Information Theory, vol. IT-10, No. 2, Apr. 1964, pp. 139-145.
Horner, Joseph L., "Light Utilization in Optical Correlators," Applied Optics, vol. 21, No. 24, Dec. 15 1982, pp. 4511-4514.
Oppenheim and Lim, "The Importance of Phase in Signals," Proceedings of the IEEE, vol. 69, No. 5, May 1981, pp. 529-541.

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