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Ultrasonic sensor

  • US 7,004,031 B2
  • Filed: 05/13/2004
  • Issued: 02/28/2006
  • Est. Priority Date: 05/16/2003
  • Status: Expired due to Fees
First Claim
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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, whereinthe compensating means compensates for the operation characteristic of the piezoelectric vibrator so that the reverberation period is adjusted to be the shortest when the reverberation period measured by the reverberation measuring means is not within a predetermined range.

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