Ultrasonic sensor
First Claim
1. An ultrasonic sensor, comprising:
- a piezoelectric vibrator which 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;
a reverberation measuring means for measuring a reverberation period of the piezoelectric vibrator from the output signal; and
a compensating means for compensating for an operation characteristic of the piezoelectric vibrator in accordance with the measured reverberation period.
1 Assignment
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Accused Products
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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Citations
12 Claims
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1. An ultrasonic sensor, comprising:
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a piezoelectric vibrator which 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;
a reverberation measuring means for measuring a reverberation period of the piezoelectric vibrator from the output signal; and
a compensating means for compensating for an operation characteristic of the piezoelectric vibrator in accordance with the measured reverberation period. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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Specification