Electrical generator or motor structure – Dynamoelectric – Rotary
Patent
1979-01-31
1981-04-28
Brown, Thomas W.
Electrical generator or motor structure
Dynamoelectric
Rotary
179180, 310327, 340621, G01F 2328, H01L 4110, H04R 1700
Patent
active
042647886
ABSTRACT:
This invention relates to damping pads and accoustical horns for use with transducer assemblies. The problems of proximity detection ranges, subfreezing operating temperature ranges, ringing and backwave reflection are addressed. In a preferred embodiment of an ultrasonic level control indicator using a piezoelectric transducer, a resilient, compressible sound absorbing damping material (like polyurethane pads) is compressed against the transducer vibrating member to decrease ringing and backwave effects. An acoustical horn assembly with a tapered opening is positioned adjacent the transducer to improve the signal.
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Kahhan Larry P.
Keidel John F.
Brown Thomas W.
Lindrooth Charles H.
Princo Instruments, Inc.
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