US3638006A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Solid-state correlator
Assignee: Lockheed Martin Tactical Systems Inc
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Filing: 1969-12-11
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Granted: 1972-01-25
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Expires: 1989-12-11
Abstract
Abstract The invention relates to a solid-state area correlation device which can be associated with other separate components to achieve a closed-loop correlation function between two images. Specifically, an amplified correlation signal is generated within a single, solid-state sandwich with optical image information impinging on both sides of the sandwich, where the construction of the sandwich is such that maximum current flow therethrough is achieved when maximum correlation of the impinging image information is achieved. Separate standard phase discriminating and integrating circuits of the images are associated with the package or sandwich to determine when correlation of the images occurs.
Inventors
- 👤 James J Hogan
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 10:50
CPC Classifications
H; H04; H04N; H04N3/00; H04N3/10; H04N3/14; G; G06; G06E; G06E3/00; G06E3/001; G06G; G06G7/00; G06G7/12; G06G7/19; G06G7/1914; H10; H10D; H10D99/00; H10F; H10F39/00; H10F39/10; H10F39/12; H10F39/191; H10F55/00; H10F55/10; H10F55/17; H10P; H10P95/00
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
69 words
A solid-state device for use in a correlator consisting of an array of separate elements each consisting of a photodiode current source, a photoconductive resistive load, a summing resistor connected between the source and load, means to place an electrical bias across the photodiode current source and the photoconductive resistive load, and means to sum the potentials across all the photoconductive resistive loads by referencing the common end thereof.
Claim 2
Dependent Claim
69 words
A solid-state device for use in a correlator consisting of an array of separate elements each consisting of a photodiode current source, a photoconductive resistive load, a summing resistor connected between the source and load, means to place an electrical bias across the photodiode current source and the photoconductive resistive load, and means to sum the potentials across all the photoconductive resistive loads by referencing the common end thereof.
Claim 3
Dependent Claim
38 words
A device for use in a correlator according to claim 1 where each element is electrically insulated from each other, but all are electrically connected in parallel whereby the current passage through the total array can be determined.
Claim 4
Dependent Claim
86 words
A device for use in a correlator according to claim 1, where the array is a lamination consisting of an insulating transparent substrate, a transparent conductive coating deposited on the substrate, a plurality of separate photoconductors uniformly positioned over the conductive coating, a conductive layer over each photoconductor, a photodiode over each conductive layer, a grid between the photoconductors and photodiodes, and a resistive layer between the grid and the conductive layer between the photoconducts and photodiodes, and means to detect the voltage on the grid.
Claim 5
Dependent Claim
135 words
A solid state correlator comprising an array of separate elements uniformly positioned over an optically clear substrate so as to be electrically insulated, but in as close a proximity to each other as possible, each element consisting of a photodiode current source, and a photoconductive resistive load, a summing resistor connected between the source and means to sum the potentials across all the photoconductive resistive loads by referencing the common end thereof, a closed housing encapsulating the entire array, means to project separate optical images onto the photodiodes and photoconductive resistive loads, means to effect a movement of at least one image relative to the side of the array onto which it is projected, and means receiving the signal from the referenced end of each resistive load and generating a correlation function between the images.
Claim 6
Dependent Claim
135 words
A solid state correlator comprising an array of separate elements uniformly positioned over an optically clear substrate so as to be electrically insulated, but in as close a proximity to each other as possible, each element consisting of a photodiode current source, and a photoconductive resistive load, a summing resistor connected between the source and means to sum the potentials across all the photoconductive resistive loads by referencing the common end thereof, a closed housing encapsulating the entire array, means to project separate optical images onto the photodiodes and photoconductive resistive loads, means to effect a movement of at least one image relative to the side of the array onto which it is projected, and means receiving the signal from the referenced end of each resistive load and generating a correlation function between the images.
Claim 7
Dependent Claim
133 words
A correlator including a device which comprises an array of separate elements each consisting of a photodiode current Source, a photoconductive resistive load, a summing resistor connected between the source and load, means to place an electrical bias across the photodiode current source and the photoconductive resistive load, and means to sum the potentials across the photoconductive resistive load by referencing the common end thereof, which further includes means to illuminate each side of the array of elements with a reference optical image on one side and a present optical image on the other side, means to phase detect the voltage-referenced end of the conductive resistive loads, and means to integrate the phase-detected signal, and means to reposition at least one of the optical image onto its side to effect the correlation therebetween.
Claim 8
Dependent Claim
133 words
A correlator including a device which comprises an array of separate elements each consisting of a photodiode current Source, a photoconductive resistive load, a summing resistor connected between the source and load, means to place an electrical bias across the photodiode current source and the photoconductive resistive load, and means to sum the potentials across the photoconductive resistive load by referencing the common end thereof, which further includes means to illuminate each side of the array of elements with a reference optical image on one side and a present optical image on the other side, means to phase detect the voltage-referenced end of the conductive resistive loads, and means to integrate the phase-detected signal, and means to reposition at least one of the optical image onto its side to effect the correlation therebetween.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-01-24 | 1975-07-26 | 1976-01-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-01-24 | 1979-07-26 | 1980-01-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-01-24 | 1983-07-26 | 1984-01-25 | $7700.00 | Window Closed / Lapsed |