Universal sensor controller for a thermal anemometer

G - Physics – 01 – P

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G01P 5/12 (2006.01) G01P 21/00 (2006.01)

Patent

CA 2660896

A fluid property measurement system (300) uses an analog-to-digital converter (309) combined with a multiplexer to measure voltages at one or more points of a measurement circuit and an algorithm within a microcontroller (310) to calculate a fluid property. The measurement circuit has at least one sensor (303) in the fluid stream. The sensor is heated by passing an electric current through the sensor. A second optional upstream sensor (304) is not heated and is at the fluid temperature. The microcontroller then uses the voltage measurements with calibration information and equations based on the desired mode of operation to calculate the fluid property.

L'invention concerne un système de mesure de propriété de fluide utilisant un convertisseur analogique/numérique combiné à un multiplexeur visant à mesurer des tensions au niveau d'un ou de plusieurs points d'un circuit de mesure, et un algorithme compris dans un microcontrôleur pour calculer une propriété de fluide. Le flux de fluide compris dans le circuit de mesure comporte au moins un capteur. Ledit capteur est chauffé par un courant électrique qui le traverse. Facultativement, un second capteur est placé en amont, qui n'est pas chauffé et est donc à la température du fluide. Selon le mode de fonctionnement souhaité, le microcontrôleur utilise alors les mesures de tension ainsi que des informations de calibrage et des équations pour calculer la propriété du fluide.

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