Browse Prior Art Database

Determining the Position of a Maximum Peak in a Two Dimensional Image

IP.com Disclosure Number: IPCOM000089940D
Original Publication Date: 1968-Dec-01
Included in the Prior Art Database: 2005-Mar-05
Document File: 2 page(s) / 75K

Publishing Venue

IBM

Related People

Pennington, KS: AUTHOR [+2]

Abstract

A scanlaser is a multimode degenerate laser cavity containing an emission control such as an electro-optic crystal for selecting modes. See the IBM Technical Disclosure Bulletin, Vol. 10, Page 1883. The above drawing shows a technique involving scanlaser type principles in combination with holographic multilens or holographic fly's eye lens principles and suitable two-dimensional code plates and photodetectors to determine maximum peak of a two-dimensional light distribution and its associated X-Y coordinates.

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Determining the Position of a Maximum Peak in a Two Dimensional Image

A scanlaser is a multimode degenerate laser cavity containing an emission control such as an electro-optic crystal for selecting modes. See the IBM Technical Disclosure Bulletin, Vol. 10, Page 1883. The above drawing shows a technique involving scanlaser type principles in combination with holographic multilens or holographic fly's eye lens principles and suitable two-dimensional code plates and photodetectors to determine maximum peak of a two- dimensional light distribution and its associated X-Y coordinates.

In drawing 1, a scanlaser type cavity receives a two-dimensional light distribution from source 8 onto one of the end mirrors 10. Also included in the cavity is variable bias plate 12 consisting of electrooptic material whose birefringence is varied by external voltage source 14. This serves to vary the threshold at which lasing occurs. In operation of this device, the bias level is adjusted such that lasing occurs only at the position of peak light intensity in the input, i.e., at the position of maximum charge density in the electron image. Under these conditions, the cavity lases in only one direction corresponding to the position of peak electron density.

Also included in the high-gain lasing cavity is a phase-only hologram multilens 16. The output from the hologram consists of 18-1...18-N separate beams whose direction, or focused position, is directly related to the direction of th...