Image dissector with many apertures for Hadamard encoding

• US 3,969,699 A
• Filed: 04/11/1975
• Issued: 07/13/1976
• Est. Priority Date: 04/11/1975
• Status: Expired due to Term

• Current Assignee: Honeywell Incorporated (Honeywell International Inc.)
• Original Assignee: Honeywell Incorporated (Honeywell International Inc.)
• Inventors: McGlaughlin, Laurence D.
• Primary Examiner(s): Boudreau, Leo H.
• Application Number:
  US05/567,154
• Time in Patent Office: 459 Days
• Field of Search: 315/10, 315/11, 315/365, 250/207, 313/65 R, 313/103 R, 340/146.3 F, 340/146.3 G, 340/146.3 MA, 340/146.3 SY, 235/164, 235/197
• US Class Current: 382/281
• CPC Class Codes: H01J 29/98 Circuit arrangements not adapted to a particular application of the tube and not otherwise provided for
• CPC Class Codes: H01J 31/42 with image screen generating a composite electron beam which is deflected as a whole past a stationary probe to simulate a scanning effect, e.g. Farnsworth pick-up tube

Abstract

An improved image dissector camera tube system for improving the signal-to-noise ratio in which the aperture plate of the image dissector has a plurality of apertures, the apertures individually biased by an electronic control network to accomplish a Hadamard encoding of the electron image.

Claims

1. An improved image dissector camera tube system comprising:

photocathode means for generating an electron image;

a plurality of normally operative detector means at known adjacent positions of the electron image for producing signals indicative of the electron density at each of the known adjacent positions;

electron controlling means for causing one of a plurality of predetermined patterns of said plurality of detector means to be inoperative during each of a plurality of successive image sampling periods, said electron controlling means further comprising programmed modulator means connected in controlling relation to each of said detector means;

combining means for combining the signals from the operative detector means during each of the plurality of sampling periods to produce a combined signal for each of said plurality of periods, said programmed modulator means together with said combining means being so coded as to cause the electron image to be transformed to a Hadamard image; and

transform means for transforming the combined signals into a series of electrical signals indicative of the electron image.

2. The system according to claim 1 wherein said transform means is an inverse Hadamard transform means.

3. An improved image dissector camera tube system comprising:

photocathode means for generating an electron image;

n normally operative detector means at known adjacent positions of the electron image for producing signals indicative of the electron density at each of the known adjacent positions;

where n is an integer;

electron controlling means for causing a different one of n predetermined patterns of said detector means to be inoperative during each of n successive image sampling periods;

combining means for combining the signals from the operative detector means during each of the n sampling periods to produce a combined signal for each of said periods, said electron controlling means further comprising programmed modulator means connected in controlling relation to each of said detector means, said programmed modulator means together with said combining means being so coded as to cause the electron image to be transformed to a Hadamard image; and

transform means for transforming the combined signals into a series of electrical signals indicative of the electron image.