Circuit arrangement for an infrared detector

The invention relates to a circuit arrangement for infrared detectors, particularly for thermal imagers with photoresistors as detector elements. In this arrangement, the collector current of a transistor (T2) is integrated in a capacitor (C2) over one sampling period. At the end of the sampling per...

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Bibliographische Detailangaben
1. Verfasser:	KRAUSE, GERHARD
Format:	Patent
Sprache:	eng ; fre ; ger
Schlagworte:	BASIC ELECTRIC ELEMENTS COLORIMETRY ELECTRIC COMMUNICATION TECHNIQUE ELECTRIC SOLID STATE DEVICES NOT OTHERWISE PROVIDED FOR ELECTRICITY MEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT,POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRA-RED,VISIBLE OR ULTRA-VIOLET LIGHT MEASURING PHYSICS PICTORIAL COMMUNICATION, e.g. TELEVISION RADIATION PYROMETRY SEMICONDUCTOR DEVICES TESTING
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Beschreibung
Zusammenfassung:	The invention relates to a circuit arrangement for infrared detectors, particularly for thermal imagers with photoresistors as detector elements. In this arrangement, the collector current of a transistor (T2) is integrated in a capacitor (C2) over one sampling period. At the end of the sampling period, the capacitor is discharged to a predetermined potential via an electronic switch (T3). In this connection, the duration of discharging is much shorter than the sampling period. The duration of discharging is preferably shorter than the Nth part of the sampling period, N being the number of detector elements and the electrical charge or the current during discharging being evaluated as a measure of the pixel amplitude.