Ultrasonic level detection device with flared section for...

G - Physics – 01 – F

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G01F 23/296 (2006.01)

Patent

CA 2670911

The invention provides a level detection device (32) having a tube (34) which, in use, contains a material (14) for which its level in the tube (34) is to be measured. An ultrasonic transducer (10) is provided at one end of tube (34) for emitting an acoustic waveform that reflects off the surface of the level and returns to the ultrasonic transducer (10) to allow computation of the level from the time periods of the emitted and reflected acoustic waveforms. A flared section (22) within tube (34 ) diverges from adjacent ultrasonic transducer (10) towards the inside wall of tube (34) above the level, whereby, in use, the measured reflected waveform has substantially reduced signal distortion due to flare (22).

L'invention concerne un dispositif de détection de niveau (32) ayant un tube (34) qui, en fonctionnement, contient un matériau (14) pour lequel l'on doit mesurer son niveau dans le tube (34). Un transducteur ultrasonore (10) est fourni au niveau d'une extrémité du tube (34) permettant d'émettre une forme d'onde acoustique qui est réfléchie par la surface du niveau et retourne vers le transducteur ultrasonore (10) afin de permettre le calcul du niveau à partir des périodes de temps de la forme d'onde acoustique réfléchie et émise. Une section évasée (22) à l'intérieur du tube (34) diverge du transducteur ultrasonore (10) adjacent vers la paroi intérieur du tube (34) au dessus du niveau, auquel cas, en fonctionnement, la forme d'onde réfléchie et mesurée présente une distorsion de signal sensiblement réduite à cause de l'évasement (22).

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