Means for reducing minimum sensing distance of an ultrasonic...

Details Means for reducing minimum sensing distance of an ultrasonic... Means for reducing minimum sensing distance of an ultrasonic...

H - Electricity

03

K

H03K 17/94 (2006.01)

Patent

CA 2273233

A rugged ultrasonic sensor is provided which is capable of detecting objects in very close proximity to the sensor. This close proximity detection includes the detection of objects which are immediately adjacent the sensor housing. Such close range operation is achieved by tailoring the transducer to operate at previously undesirable conditions, including low Q and high frequency. Such operating conditions allow the resonating characteristics of the transducer not to interfere with close range operation.

L'invention concerne un capteur ultrasonique robuste pouvant détecter des objets à proximité immédiate du capteur. La détection à proximité immédiate comprend la détection d'objets immédiatement adjacents à l'enveloppe du capteur. Pour réaliser cette opération de proximité immédiate, on règle le transducteur de manière à le faire fonctionner dans des conditions antérieurement indésirables, notamment à faible coefficient de qualité et fréquence élevée. Lesdites conditions de fonctionnement permettent d'obtenir que les caractéristiques résonnantes du transducteur ne perturbent pas l'opération de proximité immédiate.

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