DETECTOR WITH VARIABLE RESISTANCE SENSOR

摘要

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 resistanc e. 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 sign al 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.