CA2467233A1 - Ultrasonic sensor - Google Patents

Ultrasonic sensor Download PDF

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Publication number
CA2467233A1
CA2467233A1 CA 2467233 CA2467233A CA2467233A1 CA 2467233 A1 CA2467233 A1 CA 2467233A1 CA 2467233 CA2467233 CA 2467233 CA 2467233 A CA2467233 A CA 2467233A CA 2467233 A1 CA2467233 A1 CA 2467233A1
Authority
CA
Canada
Prior art keywords
piezoelectric vibrator
reverberation
ultrasonic sensor
output signal
period
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
CA 2467233
Other languages
French (fr)
Other versions
CA2467233C (en
Inventor
Kiyonari Oda
Manabu Maeda
Hisanaga Matsuoka
Yoshihisa Sato
Masakazu Takeichi
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Denso Corp
Original Assignee
Denso Corp
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Denso Corp filed Critical Denso Corp
Priority to CA 2467233 priority Critical patent/CA2467233C/en
Publication of CA2467233A1 publication Critical patent/CA2467233A1/en
Application granted granted Critical
Publication of CA2467233C publication Critical patent/CA2467233C/en
Expired - Fee Related legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01H—MEASUREMENT OF MECHANICAL VIBRATIONS OR ULTRASONIC, SONIC OR INFRASONIC WAVES
    • G01H7/00—Measuring reverberation time ; room acoustic measurements

Abstract

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.
CA 2467233 2003-05-16 2004-05-13 Ultrasonic sensor Expired - Fee Related CA2467233C (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CA 2467233 CA2467233C (en) 2003-05-16 2004-05-13 Ultrasonic sensor

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2003-138406 2003-05-16
CA 2467233 CA2467233C (en) 2003-05-16 2004-05-13 Ultrasonic sensor

Publications (2)

Publication Number Publication Date
CA2467233A1 true CA2467233A1 (en) 2005-11-13
CA2467233C CA2467233C (en) 2008-07-15

Family

ID=35452151

Family Applications (1)

Application Number Title Priority Date Filing Date
CA 2467233 Expired - Fee Related CA2467233C (en) 2003-05-16 2004-05-13 Ultrasonic sensor

Country Status (1)

Country Link
CA (1) CA2467233C (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2491043A (en) * 2011-05-19 2012-11-21 Bosch Gmbh Robert Ultrasound measurement system and method of detecting an obstacle by means of ultrasound

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR101887901B1 (en) * 2016-09-08 2018-08-13 현대오트론 주식회사 Apparatus and method for driving ultrasonic sensor

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2491043A (en) * 2011-05-19 2012-11-21 Bosch Gmbh Robert Ultrasound measurement system and method of detecting an obstacle by means of ultrasound
GB2491043B (en) * 2011-05-19 2014-12-03 Bosch Gmbh Robert Ultrasound measurement system and method of detecting an obstacle by means of ultrasound

Also Published As

Publication number Publication date
CA2467233C (en) 2008-07-15

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Effective date: 20130513