Radiant energy – Infrared-to-visible imaging – Including detector array
Patent
1977-05-13
1978-03-21
Borchelt, Archie R.
Radiant energy
Infrared-to-visible imaging
Including detector array
250330, H01J 3149
Patent
active
040805328
ABSTRACT:
A ferroelectric imaging system is taught. The system comprises a lens system, detector matrix, drive and readout electronics, controller, video processor and display. The lens system is a lens system for focusing electromagnetic energy from a scene onto a detector matrix. The drive and readout electronics selectively bias the elements of the detector matrix, and readout voltage signals indicative of the infrared energy impinging on each element of the detector matrix. The controller section includes clocks and shift registers, respectively, for timing the electronic drive and readout electronics, and for selecting in a desired order the matrix elements for readout. The controller also controls the readout signal input to the video processor which processes the voltage signal output of the detector matrix into video signals. The video signals are applied to a display means such as, for example, a cathode ray tube for display. The detector matrix includes a ferroelectric optical transducer which includes a body of ferroelectric material and a plurality of orthogonal leads formed on opposing major surfaces of the ferroelectric material. The detector matrix is mounted upon a heated substrate in a vacuum housing having an appropriate energy transmitting window. The body of ferroelectric material and orthogonal leads form a plurality of thermal sensitive capacitors with the ferroelectric material acting as the dielectric and the orthogonal leads as plates. The plurality of capacitors is divided into two portions; one portion receiving energy to vary their capacitance in proportion to the energy received, and a second portion shielded from the energy to provide reference capacitors. The thermal responsive capacitors and reference capacitors are arranged with the drive and output electronics to form a bridge having an output voltage indicative of the thermal energy detected.
REFERENCES:
patent: 3786269 (1974-01-01), Cooper
patent: 3808435 (1974-04-01), Bate et al.
patent: 3919555 (1975-11-01), Singer
patent: 3932753 (1976-01-01), Stotlar
Bandy Alva H.
Borchelt Archie R.
Grossman Rene E.
Texas Instruments Incorporated
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