G - Physics
01
H
G01H 7/00 (2006.01) G01H 11/08 (2006.01)
Patent
CA 2467233
An ultrasonic sensor includes a piezoelectric vibrator (1), a reverberation measuring device (5) and a compensating device (2a-2c, 5, 6, 8a-8c, 9a-9c, 10a, 10b). The piezoelectric vibrator (1) 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 (1). The reverberation measuring device (5) measures a reverberation period of the piezoelectric vibrator (1) from the output signal. The compensating device (2a-2c, 5, 6, 8a-8c, 9a-9c, 10a, 10b) compensates for an operation characteristic of the piezoelectric vibrator (1) 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.
Maeda Manabu
Matsuoka Hisanaga
Oda Kiyonari
Sato Yoshihisa
Takeichi Masakazu
Denso Corporation
Fetherstonhaugh & Co.
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