Process and device for determining the level of a fluid...

G - Physics – 01 – S

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Details

G01S 15/10 (2006.01) G01F 23/296 (2006.01) G01S 7/52 (2006.01) G01S 15/88 (2006.01)

Patent

CA 2241875

In order to improve the measuring accuracy of a liquid level (H) in a container (2) from an echo time measurement of ultrasonic pulses and a mean sound velocity (.dottedcircle.), it is provided to extrapolate the mean sound velocity (.dottedcircle.) from at least two reference sound velocities in the liquid (90). It is possible in this way to achieve a measuring accuracy of less than a millimetre independently of the liquid level (H). Specified for carrying out the method is a device (1) having a main measuring path, at least one device for transmitting and receiving ultrasonic pulses, at least two reference paths for determining sound velocities, and having a computer unit (50), the computer unit (50) extrapolating to the mean sound velocity from the (.dottedcircle.) sound velocities.

Afin d'améliorer le précision de mesure du niveau (H) d'un liquide situé dans un récipient (2) d'après la mesure du temps de transit d'impulsions ultrasonores et d'une vitesse moyenne du son ( nu ), il est prévu d'extrapoler la vitesse moyenne du son ( nu ) à partir d'au moins deux vitesses de référence du son dans le liquide (90). Ce procédé permet de parvenir à un degré de précision de mesure inférieur à 1mm, indépendamment du niveau (H) de liquide. L'invention concerne en outre un dispositif (1) permettant de mettre ledit procédé en oeuvre, qui comprend au moins une section principale de mesure, au moins un dispositif servant à émettre et à recevoir des impulsions ultrasonores, au moins deux sections de référence pour déterminer les vitesses du son et une unité de calcul (50). Cette dernière (50) extrapole la vitesse moyenne du son ( nu ) à partir des vitesses du son obtenues.

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