Measuring and testing – Vibration – By mechanical waves
Reexamination Certificate
2006-02-28
2006-02-28
Williams, Hezron (Department: 2856)
Measuring and testing
Vibration
By mechanical waves
C367S099000, C367S901000, C367S903000
Reexamination Certificate
active
07004031
ABSTRACT:
An ultrasonic sensor includes a piezoelectric vibrator, a reverberation measuring device and a compensating device. The piezoelectric vibrator vibrates to transmit an ultrasonic wave, receives a reflected wave of the transmitted ultrasonic wave and produces an output signal corresponding to vibration of the piezoelectric vibrator. The reverberation measuring device measures a reverberation period of the piezoelectric vibrator from the output signal. The compensating device compensates for an operation characteristic of the piezoelectric vibrator in accordance with the measured reverberation period. Thus, the ultrasonic sensor can decrease a reverberation period, which may cause reduction in detection accuracy and impossibility of detection of an obstacle at a short distance.
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Maeda Manabu
Matsuoka Hisanaga
Oda Kiyonari
Sato Yoshihisa
Takeichi Masakazu
Denso Corporation
Miller Rose M.
Nippon Soken Inc.
Posz Law Group, LLC
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