Radiant energy – Invisible radiant energy responsive electric signalling – Infrared responsive
Patent
1986-08-11
1989-01-03
Howell, Janice A.
Radiant energy
Invisible radiant energy responsive electric signalling
Infrared responsive
250342, G01J 144
Patent
active
047959053
ABSTRACT:
A circuit layout operating in the current mode for an infrared room surveillance detector includes a high impedance operational amplifier connected directly to a pyroelement used as an infrared sensor. This results in a high sensitivity detector circuit with a low noise component in the detector output signal and maintaining a high impedance detector circuit. The detector circuit has a constant amplification over a relatively broad frequency range. The reaction resistor of the operational amplifier is chosen to have a high impedance, preferably in a range higher than 10.sup.11 Ohm. It is advantageous to take the reference voltage required for the evaluation of the detector output signal from the operational amplifier, so that aside from the simplified circuit layout, no further structural parts capable of increasing the interference sensitivity of the detector circuit are required. To further increase the electromagnetic compatibility, the threshold value comparator stage may also be located in the detector housing.
REFERENCES:
patent: 3657644 (1972-04-01), Beam et al.
patent: 4149160 (1979-04-01), Bozarth et al.
patent: 4198564 (1980-04-01), Baker et al.
patent: 4384207 (1983-05-01), Doctor
patent: 4418335 (1983-11-01), Genahr
Microelectronics, Jacob Millman, 1979.
"Aufspueren von Infrarotstrahlen", Funkschau, Apr. 1982, Helmut Israel.
Tietze -Schenk, Halbleiter-Schaltungs-Technik, 7. Auflage, 1985, pp. 142, 143.
Semiconductor Data Library, vol. 5, Series B, Motorola 1976.
"Elektronik", 1972, Berichte aus der Elektonik, by Dipl.-Phys. Hanns-Peter Siebert.
Howell Janice A.
Koch Robert J.
Richard Hirschmann Radiotechnisches Werk
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