Means for reducing minimum sensing distance of an ultrasonic pro

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

1996-12-31

1999-06-29

Swann, Glen

Communications, electrical: acoustic wave systems and devices

Echo systems

Presence or movement only detection

340568, 367135, 367137, 367191, G01S 1504

Patent

active

059177764

ABSTRACT:
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.

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Motorola data sheets, 45 Khz Transducer, 1988.
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