Ultrasonic material level measurement

G - Physics – 01 – F

Patent

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Details

G01F 23/296 (2006.01) G01F 25/00 (2006.01)

Patent

CA 2149352

Apparatus for indicating material level that includes a pair of ultrasonic transducers on opposed sides of a space for receiving the material at the level to be detected. A swept frequency oscillator is coupled to one of the transducers so that the transducer radiates into the material space ultrasonic energy that continuously sweeps back and forth between a low frequency range at which such energy is transmitted to the other transducer by resonance of the entire apparatus and independent of presence of material in the material space, and a higher frequency range at which such energy is transmitted to the other transducer only when material is present in the space between the transducers. Detection circuitry indicates presence of material between the transducers upon receipt of the higher frequency energy, and failure of the apparatus upon failure to receive the lower frequency energy.

Dispositif servant à indiquer un niveau de matériel composé d'une paire de transducteurs électroniques disposés de part et d'autre d'un espace destiné à recevoir le matériel jusqu'au niveau de détection. Un oscillateur à balayage est couplé à l'un des transducteurs de manière à produire un aller-retour continuel d'énergie ultrasonore entre une plage de basses fréquences à laquelle l'énergie est transmise à l'autre transducteur par résonance du dispositif entier et une plage de hautes fréquences à laquelle l'énergie ultrasonore n'est transmise à l'autre transducteur que lorsque la présence de matériel est détectée dans l'espace entre les transducteurs. Un circuit de détection indique la présence de matériel entre les transducteurs sur réception d'une énergie haute fréquence de même qu'en cas de non réception d'énergie basse fréquence.

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