Radiant energy – Radiant energy generation and sources – Plural radiation sources
Patent
1989-06-21
1990-05-01
Berman, Jack I.
Radiant energy
Radiant energy generation and sources
Plural radiation sources
2504931, 250504R, 2733481, 219553, H05B 326
Patent
active
049221167
ABSTRACT:
An infrared (IR) simulator is disclosed in which an array of pixels is defined on an insulative substrate by resistor bridges which contact the substrate at spaced locations and are separated from the substrate, and thereby thermally insulated therefrom, between the contact locations. Semiconductor drive circuits on the substrate enable desired current flows through the resistor bridges in response to input control signals, thereby establishing the appropriate IR radiation from each of the pixels. The drive circuits and also at least some of the electrical lead lines are preferably located under the resistor bridges. A thermal reflector below each bridge shields the drive circuit and reflects radiation to enhance the IR output. The drive circuits employ sample and hold circuits which produce a substantially flicker-free operation, with the resistor bridges being impedance matched with their respective drive circuits. The resistor bridges may be formed by coating insulative base bridges with a resistive layer having the desired properties, and overcoating the resistive layers with a thermally emissive material. The array is preferably formed on a silicon-on-sapphire (SOS) wafer. Arrays of electromagnetic radiation bridge detectors may also be formed, with the bridges having either resistor, thermocouple or Schottky junction constructions.
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Grinberg Jan
Welkowsky Murray S.
Berman Jack I.
Coble P. M.
Denson-Low W. K.
Duraiswamy V. D.
Hughes Aircraft Company
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