WO2002054827A3 - Wideband transducer - Google Patents

Wideband transducer Download PDF

Info

Publication number
WO2002054827A3
WO2002054827A3 PCT/NO2002/000005 NO0200005W WO02054827A3 WO 2002054827 A3 WO2002054827 A3 WO 2002054827A3 NO 0200005 W NO0200005 W NO 0200005W WO 02054827 A3 WO02054827 A3 WO 02054827A3
Authority
WO
WIPO (PCT)
Prior art keywords
electric
layers
ports
transducer
band
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.)
Ceased
Application number
PCT/NO2002/000005
Other languages
French (fr)
Other versions
WO2002054827A2 (en
Inventor
Bjoern A J Angelsen
Tonni F Johansen
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.)
Individual
Original Assignee
Individual
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 Individual filed Critical Individual
Priority to EP02710569A priority Critical patent/EP1396172A2/en
Priority to JP2002555583A priority patent/JP2004518319A/en
Publication of WO2002054827A2 publication Critical patent/WO2002054827A2/en
Anticipated expiration legal-status Critical
Publication of WO2002054827A3 publication Critical patent/WO2002054827A3/en
Ceased legal-status Critical Current

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B06—GENERATING OR TRANSMITTING MECHANICAL VIBRATIONS IN GENERAL
    • B06B—METHODS OR APPARATUS FOR GENERATING OR TRANSMITTING MECHANICAL VIBRATIONS OF INFRASONIC, SONIC, OR ULTRASONIC FREQUENCY, e.g. FOR PERFORMING MECHANICAL WORK IN GENERAL
    • B06B1/00—Methods or apparatus for generating mechanical vibrations of infrasonic, sonic, or ultrasonic frequency
    • B06B1/02—Methods or apparatus for generating mechanical vibrations of infrasonic, sonic, or ultrasonic frequency making use of electrical energy
    • B06B1/06—Methods or apparatus for generating mechanical vibrations of infrasonic, sonic, or ultrasonic frequency making use of electrical energy operating with piezoelectric effect or with electrostriction
    • B06B1/0607—Methods or apparatus for generating mechanical vibrations of infrasonic, sonic, or ultrasonic frequency making use of electrical energy operating with piezoelectric effect or with electrostriction using multiple elements
    • B06B1/0611—Methods or apparatus for generating mechanical vibrations of infrasonic, sonic, or ultrasonic frequency making use of electrical energy operating with piezoelectric effect or with electrostriction using multiple elements in a pile
    • B06B1/0614—Methods or apparatus for generating mechanical vibrations of infrasonic, sonic, or ultrasonic frequency making use of electrical energy operating with piezoelectric effect or with electrostriction using multiple elements in a pile for generating several frequencies
    • G—PHYSICS
    • G10—MUSICAL INSTRUMENTS; ACOUSTICS
    • G10K—SOUND-PRODUCING DEVICES; METHODS OR DEVICES FOR PROTECTING AGAINST, OR FOR DAMPING, NOISE OR OTHER ACOUSTIC WAVES IN GENERAL; ACOUSTICS NOT OTHERWISE PROVIDED FOR
    • G10K11/00—Methods or devices for transmitting, conducting or directing sound in general; Methods or devices for protecting against, or for damping, noise or other acoustic waves in general
    • G10K11/02—Mechanical acoustic impedances; Impedance matching, e.g. by horns; Acoustic resonators
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; ELECTRIC HEARING AIDS; PUBLIC ADDRESS SYSTEMS
    • H04R17/00—Piezoelectric transducers; Electrostrictive transducers

Landscapes

  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Acoustics & Sound (AREA)
  • Mechanical Engineering (AREA)
  • Signal Processing (AREA)
  • Multimedia (AREA)
  • Transducers For Ultrasonic Waves (AREA)
  • Ultra Sonic Daignosis Equipment (AREA)
  • Investigating Or Analyzing Materials By The Use Of Ultrasonic Waves (AREA)

Abstract

Ultrasound bulk wave transducers and bulk wave transducer arrays for wide band or multi frequency band operation, in which the bulk wave is radiated from a front surface and the transducer is mounted on a backing material with sufficiently high absorption that reflected waves in the backing material can be neglected. The transducer is formed of layers that include a high impedance section comprised of at least one piezoelectric layer covered with electrodes to form an electric port, and at least one additional elastic layer, with all of the layers of the high impedance section having substantially the same characteristic impedance to yield negligible reflection between the layers. The transducer further includes a load matching section comprised of a set of eleastic layers for impedance matching between the high impedance section and the load material and, optionally, impedance matching layers between the high impedance section and the backing material for shaping the transducer frequency response. For multiband operation, the high impedance section includes multiple piezoelectric layers covered with electrodes to form multiple electric ports that can further be combined by electric parallel, anti-parallel, serial, or anti-serial galvanic coupling to form electric ports with selected frequency transfer functions. Each electric port may be connected to separate electronic transceiver systems to obtain, through selection of drive signals on individual ports, selectable electric parallel, anti-parallel, serial, or anti-serial coupling of the ports in transmit mode, enabling transmission of ultrasound pulses with multi-band frequency components. In receive mode, signals from the individual electric ports can be combined after isolation amplifiers in a filter-combination unit to obtain composite electric ports with extreme wide-band transfer functions and multi-band transfer functions covering a range from a 1st to a 4th harmonic band.
PCT/NO2002/000005 2001-01-05 2002-01-07 Wideband transducer Ceased WO2002054827A2 (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
EP02710569A EP1396172A2 (en) 2001-01-05 2002-01-07 Wideband transducer
JP2002555583A JP2004518319A (en) 2001-01-05 2002-01-07 Broadband transducer

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US26002301P 2001-01-05 2001-01-05
US60/260,023 2001-01-05

Publications (2)

Publication Number Publication Date
WO2002054827A2 WO2002054827A2 (en) 2002-07-11
WO2002054827A3 true WO2002054827A3 (en) 2003-12-24

Family

ID=22987493

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/NO2002/000005 Ceased WO2002054827A2 (en) 2001-01-05 2002-01-07 Wideband transducer

Country Status (6)

Country Link
US (1) US6645150B2 (en)
EP (1) EP1396172A2 (en)
JP (1) JP2004518319A (en)
CN (1) CN1666568A (en)
RU (1) RU2003124631A (en)
WO (1) WO2002054827A2 (en)

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Also Published As

Publication number Publication date
US6645150B2 (en) 2003-11-11
WO2002054827A2 (en) 2002-07-11
JP2004518319A (en) 2004-06-17
EP1396172A2 (en) 2004-03-10
RU2003124631A (en) 2005-02-27
CN1666568A (en) 2005-09-07
US20020156379A1 (en) 2002-10-24

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