Patent ID: 6829930
Filing Date: 2004-12-14
Classification: G01P

Abstract:
A gas velocity and temperature sensor comprising:a first thermistor driven at a constant temperature and configured to output a flow signal representive of the power dissipated as a function of the gas velocity and a temperature signal representative of the temperature of the first thermistor; a second thermistor configured to output a gas temperature signal representative of the gas temperature proximate the second thermistor; and a processor responsive to the flow signal and the temperature signals, the processor configured to calculate gas velocity using the empirically derived equation v&TildeFullEqual;[kPÎ”&it;â€ƒ&it;T]5/2where k is the constant representing calibration constants of the first and second thermistors, P is the power dissapated and &Dgr;T is the difference between the temperature of the first thermistor and the gas temperature proximate the second thermistor, the processor deriving a signal representing the gas velocity.