A method and apparatus for determining flow rate of a fluid

G - Physics – 01 – F

Patent

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G01F 1/56 (2006.01) G01F 1/696 (2006.01)

Patent

CA 2494488

A sensor for determining flow rate of a fluid includes a thermistor inserted into a volume through which the fluid flows. The thermistor cycles between its zero-power mode and its self-heated mode. In the zero-power mode, the thermistor is used to determine the ambient temperature of the fluid. In the self-heated mode, the thermistor is used to determine the amount of heat removed by the fluid. The ambient temperature of the fluid, the amount of heat removed by the fluid, and the thermal properties of the fluid are then utilized to determine the flow rate of the fluid.

L'invention concerne un capteur destiné à déterminer le débit d'un fluide, comprenant une thermistance insérée dans un volume dans lequel s'écoule le fluide. L'invention concerne également les cycles de la thermistance entre son mode puissance zéro et son mode autochauffant. Dans le mode puissance zéro, la thermistance est utilisée pour déterminer la température ambiante du fluide. Dans le mode chauffant, la thermistance est utilisée pour déterminer la quantité de chaleur éliminée par le fluide. La température ambiante du fluide, la quantité de chaleur éliminée par le fluide et les propriétés thermiques du fluide sont alors utilisées pour déterminer le débit du fluide.

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