Radiant energy – Invisible radiant energy responsive electric signalling – Infrared responsive
Patent
1986-09-26
1989-05-16
Howell, Janice A.
Radiant energy
Invisible radiant energy responsive electric signalling
Infrared responsive
250332, 2503383, 3072961, 330296, 357 30, G01J 144
Patent
active
048312576
ABSTRACT:
What is disclosed is a preamplifier used with each pyroelectric detector in an infrared imaging array system. To bias the preamplifiers either a MOSFET transistor is utilized as a switch that is periodically operated to place charge on the gate of the MOSFET preamplifier transistor to maintain it at its bias level, or an NPN transistor is operated at a level to provide high impedance. When the bias switch is not operated, the associated detector detects and a reading is taken from each detector in the array. NPN transistor switches can be manufactured consistently and their conduction level can be adjusted to balance the gain of all preamplifiers in the detector array. The supply voltage to the preamplifiers in the array is monitored by a feedback circuit which compares a supply voltage to a reference voltage and adjusts the preamplifier bias voltage to compensate for changes in the supply voltage.
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Butler Neal R.
Iwasa Shigesato
McClelland Jeff L.
Honeywell Inc.
Howell Janice A.
Rauchholz William F.
Ungemach Charles J.
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