Communications – electrical: acoustic wave systems and devices – Signal transducers
Patent
1994-04-29
1996-01-09
Eldred, J. Woodrow
Communications, electrical: acoustic wave systems and devices
Signal transducers
367157, 310317, 310800, 340904, 340435, H04R 1700
Patent
active
054835011
ABSTRACT:
A short distance ultrasonic distance meter is disclosed with provisions to reduce the ill-effects of ringing when measurements are of obstacles closer than about ten inches. In one embodiment an opposite phase ultrasonic wave is introduced by a circuit (245) and in another embodiment a strain sensor (232) introduces negative feedback to effect cancellation of ringing (147). Finally, in a third embodiment, both the negative feedback and opposite phase methods are employed for optimal results.
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Park Kyung T.
Toda Minoru
Eldred J. Woodrow
Francos William
The Whitaker Corporation
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