Time lag approach for measuring thermal conductivity and...

G - Physics – 01 – N

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G01N 27/18 (2006.01)

Patent

CA 2316891

A method and apparatus for providing a more direct approach to determine the thermal conductivity, thermal diffusivity and specific heat of a fluid of interest, independently of the amplitude of the sensor output. This is preferably accomplished by measuring one or more variable phase or time lags between selected input and output AC signals, and directly deriving the thermal conductivity, thermal diffusivity and specific heat therefrom. Such derivation is therefore less dependent than amplitude-based sensors on occasional or unpredictable drift in sensor resistive elements.

La présente invention concerne un dispositif et un procédé qui permettent une détermination plus directe de la conductivité thermique, de la diffusivité thermique et de la chaleur spécifique d'un fluide d'intérêt, indépendamment de l'amplitude du signal de sortie du capteur. Le procédé consiste, de préférence, à mesurer une ou plusieurs retards de phases variables ou décalages temporels variables entre des signaux c.a. d'entrée et de sortie choisis, et à en déduire directement la conductivité thermique, la diffusivité thermique et la chaleur spécifique. Une telle déduction est donc moins dépendante par rapport aux capteurs, que celle basée sur une dérive occasionnelle ou imprévisible des éléments résistifs du capteur.

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