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US3689772A Expired / Lapsed US ⏱️ 0.0 years remaining

Photodetector light pattern detector

Assignee: Northrop Grumman Guidance and Electronics Co Inc
•
Filing: 1971-08-18
•
Granted: 1972-09-05
•
Expires: 1991-08-18
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Abstract

Abstract A special photodetector array for sampling the light energy distribution in a plane, such as the diffraction or fouriertransform pattern of an illuminated object transparency which is obtained by a well-known optical configuration in the rear focal plane of a simple lens. The function of the array, in this diffraction pattern measurement example, is to provide simultaneous and nearly instantaneous voltage readouts corresponding to the power spectral density and to the angular variations in the spatial structure of the input object''s pattern. The array comprises first and second semi-circular subarrays. The first sub-array comprises a plurality of concentric annular detectors, such as hemi-rings. The second sub-array comprises a plurality of detectors extending approximately radially from near to the center of the first sub-array. Each detector of the array is provided with a separate attached electrical conductor. The conductors attached to the ring detectors are positioned in portions of approximately radial sector gaps separating the two sub-arrays.

Inventors

  • 👤 Nicholas George
  • 👤 James T Thomasson
  • 👤 Abraham Spindel

Bibliographic Details

Application Number —
Jurisdiction US
Data Source google_patents
Last Synchronized 2026-10-23 18:02
CPC Classifications
H; H10; H10F; H10F39/00; H10F39/10; H10F39/107; G; G02; G02B; G02B27/00; G02B27/42; G02B27/46; G06; G06V; G06V10/00; G06V10/88; H10D; H10D99/00

Claims Analysis

Total Claims: 11
Claim 1
Independent Claim 92 words
Apparatus for sampling the light energy distribution in the rear focal-plane of a spherical lens for sampling geometric relationships and the spectral density distribution of objects recorded on film transparencies, said apparatus comprising: a single monolithic array of photodetectors having a circular array of detectors comprising first and second semi-circular sub-arrays of detectors; the first sub-array comprising a plurality of annular detectors concentric about the center of the circular array; and the second sub-array comprising a plurality of portions of sector detectors extending approximately radially from the center of the circular array.
Claim 2
Dependent Claim 92 words
Apparatus for sampling the light energy distribution in the rear focal-plane of a spherical lens for sampling geometric relationships and the spectral density distribution of objects recorded on film transparencies, said apparatus comprising: a single monolithic array of photodetectors having a circular array of detectors comprising first and second semi-circular sub-arrays of detectors; the first sub-array comprising a plurality of annular detectors concentric about the center of the circular array; and the second sub-array comprising a plurality of portions of sector detectors extending approximately radially from the center of the circular array.
Claim 3
Dependent Claim 20 words
Apparatus as claimed in claim 1 wherein each detector of the array is provided with a separate attached electrical conductor.
Claim 4
Dependent Claim 18 words
Apparatus as claimed in claim 1 wherein the first and second sub-arrays are separated by radial sector gaps.
Claim 5
Dependent Claim 42 words
Apparatus as claimed in claim 3 wherein each zone detector of the first sub-array is provided with a separated attached electrical conductor extending from the detector to the outer edge of the array, the conductors being positioned in the radial sector gaps.
Claim 6
Dependent Claim 16 words
Apparatus as claimed in claim 4 wherein said conductors are integral with the respective zone detector.
Claim 7
Dependent Claim 26 words
Apparatus as claimed in claim 2 wherein the electrical conductors of the second sub-array are attached to the sector detectors at the periphery of the array.
Claim 8
Dependent Claim 26 words
Apparatus as claimed in claim 1 wherein each sector detector of the second sub-array extends outward from a point on a radius of the circular array.
Claim 9
Dependent Claim 18 words
Apparatus as claimed in claim 1 and further including a circular detector at the center of the array.
Claim 10
Dependent Claim 38 words
Apparatus as claimed in claim 4 and further including a circular detector at the center of the array, the circular detector being provided with a separate attached electrical conductor positioned in one of the approximately radial sector gaps.
Claim 11
Dependent Claim 28 words
Apparatus as in claim 2 wherein a plurality of ring detectors of the first sub-array is provided with a separate attached electrical conductor extending accurately along the detector.

References Cited (Backward Citations)

US3046405A Cited
US3195396A Cited
US3164795A Cited
US3222531A Cited
US3480783A Cited

USPTO Annuity & Maintenance Windows

Annuity Stage Window Opens Payment Deadline Surcharge Period Until Estimated Fee Status
3.5 Years (Year 4) 1975-09-05 1976-03-06 1976-09-05 $2000.00 Window Closed / Lapsed
7.5 Years (Year 8) 1979-09-05 1980-03-06 1980-09-05 $3760.00 Window Closed / Lapsed
11.5 Years (Year 12) 1983-09-05 1984-03-06 1984-09-05 $7700.00 Window Closed / Lapsed

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