Thomas C Johansen

US Patent:

42290724, Oct 21, 1980

Filed:

Jun 6, 1978

Appl. No.:

5/913259

Inventors:

Ernest J. Torok - Saint Paul MN
David L. Fleming - Edina MN
Thomas R. Johansen - Minneapolis MN

Assignee:

Sperry Rand Corporation - New York NY

International Classification:

G02F 109
G11C 1306
H04N 931
G11B 1110

US Classification:

350151

Abstract:

A display system using the dispersive Faraday coefficient of a magnetic screen to obtain a color display from white light is disclosed. A beam of energy is directed upon a magnetic screen while concurrently an intensity modulated magnetic field is directed normal to the surface of the magnetic screen. The combination of the heating effect of the energy beam and the magnetic orienting effect of the intensity modulated magnetic field established localized areas of differing magnetic characteristics over the planar surface of the magnetic screen. Subsequently, a polarized beam of white light that floods the magnetic screen is, for each of several wave lengths, differently rotated upon passing through each of the areas of differing magnetic characteristics in the magnetic screen. The beamlets that are formed by the so-differently rotated areas of the polarized white light beam are then passed through an uncrossed analyzer, which beamlets appear as a multicolored projection upon the magnetic screen.

US Patent:

41231422, Oct 31, 1978

Filed:

Feb 28, 1977

Appl. No.:

5/772880

Inventors:

David L. Fleming - Edina MN
Thomas R. Johansen - Minneapolis MN
Ernest J. Torok - St. Paul MN

Assignee:

Sperry Rand Corporation - New York NY

International Classification:

G06G 900
G03H 116

US Classification:

350162SF

Abstract:

A system for optically correlating two signals, e. g. , radar, sonar, etc. , incorporating both time shifts and doppler shifts is described. The correlation of the signals is produced as a two-dimensional distribution of light on a light detector/display plane wherein the amplitude of the light distribution is proportional to the correlation of the two signals as a function of relative time shifts,. DELTA. t (X direction), and relative doppler shifts,. alpha. omega. (Y direction), between the signals. Doppler shifts are introduced into the processor by the incorporation of a channelized cylindrical lens in one signal channel while using a cylindrical lens in the other signal channel.