Detector with variable resistance sensor

G - Physics – 01 – D

Patent

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Details

G01D 3/036 (2006.01) G01D 3/02 (2006.01) G01N 27/04 (2006.01) G01N 27/12 (2006.01) G01N 33/00 (2006.01)

Patent

CA 2221678

An ambient condition sensor exhibits a resistance change as a function of the sensed condition. This change varies over several orders of magnitude. The sensor can be coupled to a circuit with a dynamically changing impedance to facilitate an accurate measurement of the variable sensor resistance. This circuit can include a ladder network of resistors which can be controllably coupled to the sensor as a function of sensor output resistance. The output signal from the sensor can be processed using analog or digital techniques to minimize noise induced variations. The sensor output resistance value can be converted to time for purposes of measurement and subsequent processing.

Capteur de condition ambiante subissant un changement de résistance proportionnel aux variations de la condition contrôlée et pouvant varier de plusieurs ordres de grandeurs. Le capteur de cette invention peut être relié à un circuit à impédance pour faciliter la mesure des changements de résistance. Ce circuit peut comprendre des résistances montées en échelle, qui peuvent être reliées au capteur en fonction de la résistance de sortie du capteur. Le signal de sortie du capteur peut être traité de façon analogique ou numérique afin de réduire au minimum les effets du bruit. La résistance de sortie du capteur peut être convertie en durée aux fins de la mesure et du traitement subséquent.

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