G - Physics – 01 – N
Patent
G - Physics
01
N
G01N 27/12 (2006.01) G01F 23/22 (2006.01) G01F 23/24 (2006.01) G01K 7/16 (2006.01)
Patent
CA 2446660
A method of detecting a dry/wet state of a thermistor bead comprises the steps of: conducting a bias current through the thermistor bead; measuring a voltage across the thermistor bead in response to the bias current; measuring a temperature in proximity to the thermistor bead; generating a reference voltage in proportion to the measured temperature; and detecting the dry/wet state of the thermistor bead based on the measured and reference voltages. Also disclosed is apparatus for detecting a dry/wet state of a thermistor bead which comprises: a first circuit coupled to the thermistor bead for conducting a bias current through the thermistor bead; a temperature sensor for measuring a temperature in proximity to the thermistor bead; a second circuit coupled to the temperature sensor for generating a reference voltage in proportion to the measured temperature of the sensor; and a third circuit coupled to the thermistor bead for measuring a voltage across the thermistor bead in response to the bias current, and also coupled to the second circuit for detecting the dry/wet state of the thermistor bead based on the measured and reference voltages. Apparatus for implementing this method is also disclosed.
Simmonds Precision Products Inc.
Smart & Biggar
LandOfFree
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