Radiation detecting array including unit cells with periodic out

Details Radiation detecting array including unit cells with periodic out Radiation detecting array including unit cells with periodic out

1988-11-03

1991-01-01

Nelms, David C.

Radiant energy

Photocells; circuits and apparatus

Photocell controlled circuit

2505781, 324 77K, H01J 4014

Patent

active

049820800

ABSTRACT:
A radiation detecting array 10 has a frequency domain architecture wherein incident radiation is imaged in parallel by an array of radiation detectors 12-16. Each radiation detector has an associated amplitude to frequency conversion device 18-22 for providing output signals wherein the output of each photodetector is represented as a frequency within a uniquely identified band of frequencies, the specific frequency being a function of the output signal amplitude of the photodetector. The readout of one or more selected detectors is accomplished by providing a swept frequency band or bands associated with the desired detector or detectors and mixing the detector frequencies with the swept band. The frequency representing the photodetector output may be input directly to a low dispersion transmission line 30. The unit cells may include radiation detectors comprised of superconducting material and also superconducting components that inherently manifest current or voltage to frequency conversion characteristics in accordance with the Josepson effect. An array having high temperature superconducting components includes photodetectors 60, associated voltage to frequency convertors 64 and a transmission line 70 integrated upon a common substrate.

REFERENCES:
patent: 4636718 (1987-01-01), Labrum et al.
patent: 4695790 (1987-09-01), Mathis
patent: 4831421 (1989-05-01), Gallagher et al.
patent: 4837604 (1989-06-01), Faris

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