Patent
Circuit layout for an infrared room surveillance detector
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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 1011 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.read more
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References
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Patent
Infrared intrusion detector with pyroelectric sensor and charge amplifier
TL;DR: In this article, an infrared intrusion detector, utilizing as a sensor element a pyroelectric detector element, accomplishes evaluation of the output signal of the detector element with a charge amplifier, for instance by means of a capacitive feedback coupled operational amplifier.
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Differential pyroelectric detector
TL;DR: In this article, a pyroelectric detector consisting of a front surface for receiving radiation, a rear surface, a relatively thin coating of radiation absorbing and transmitting and electrically conducting material applied to the entire front surface, and a pair of relatively thicker areas of radiation reflecting and electrical conducting material applying to the rear surface in spaced-apart relation is defined.
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Thermodielectric radiometer utilizing polymer film
Beam Benjamin H,Russell Larry D +1 more
TL;DR: In this article, a thermodielectric radiometer employing a polymer film or a capacitor dielectric is presented, which is charged to a suitable voltage gradient and produces a proportional open-circuit voltage increment which can be measured to provide an indication of the total energy or power of a short-duration pulse of radiant flux.
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Multi-input signal comparator and indicator circuit
TL;DR: In this article, a multi-input signal comparator and indicator circuit for comparing a plurality of signal levels with a reference level and an indicator circuit arranged to respond to a comparator output signal for indicating an error in any of the comparator input signals.
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Pyroelectric detector circuits and devices
Geoffrey Baker,Annis A D +1 more
TL;DR: In this paper, a radiation detector circuit including a pyroelectric detector element and field effect transistor amplifier means is presented, where a non-linear device is incorporated in a feedback path between the output side of an amplification stage and the detector element.