Browse Prior Art Database

Electronic Optical Correlator

IP.com Disclosure Number: IPCOM000093779D
Original Publication Date: 1966-Feb-01
Included in the Prior Art Database: 2005-Mar-06
Document File: 2 page(s) / 39K

Publishing Venue

IBM

Related People

Gaffney, JE: AUTHOR [+2]

Abstract

This apparatus correlates the optical image on the reference transparency with the optical image on the signal transparency. The resultant correlation image appears on the recording medium and is useful wherever a comparison of two signals is desired.

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Electronic Optical Correlator

This apparatus correlates the optical image on the reference transparency with the optical image on the signal transparency. The resultant correlation image appears on the recording medium and is useful wherever a comparison of two signals is desired.

A coherent light source directs light through a first collimating lens to the reference transparency. The light from the reference transparency passes through an electronic deflector such as that discussed in "A Fast, Digital-Indexed Light Deflector", IBM Journal of Research and Development, Vol.8, No.1, January 1964, pp.64-67. The light from the electronic deflector passes serially through a primary objective lens, a filtering slit, and a second collimating lens. It then impinges on the signal transparency.

The electronic deflector, as a result of a control signal from the electronic control, causes image A on the reference transparency to move across the signal transparency from initial position X toward dotted line position Y as a function of the electronic control signal. The electronic deflector therefore causes relative motion between the reference transparency image and the signal transparency image. Thus, there is produced a correlation of the two images without the need for mechanical motion of either of the transparencies.

The correlation signal emanating from the signal transparency passes serially through a channelizer, a second objective lens and a final filter. It then imp...