EP1921600A1 - Transducteur à ultrasons - Google Patents

Transducteur à ultrasons Download PDF

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Publication number
EP1921600A1
EP1921600A1 EP06076994A EP06076994A EP1921600A1 EP 1921600 A1 EP1921600 A1 EP 1921600A1 EP 06076994 A EP06076994 A EP 06076994A EP 06076994 A EP06076994 A EP 06076994A EP 1921600 A1 EP1921600 A1 EP 1921600A1
Authority
EP
European Patent Office
Prior art keywords
ultrasonic
cover layer
pei
ultrasonic transducer
signal
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
EP06076994A
Other languages
German (de)
English (en)
Inventor
designation of the inventor has not yet been filed The
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.)
Nederlandse Organisatie voor Toegepast Natuurwetenschappelijk Onderzoek TNO
Original Assignee
Nederlandse Organisatie voor Toegepast Natuurwetenschappelijk Onderzoek TNO
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 Nederlandse Organisatie voor Toegepast Natuurwetenschappelijk Onderzoek TNO filed Critical Nederlandse Organisatie voor Toegepast Natuurwetenschappelijk Onderzoek TNO
Priority to EP06076994A priority Critical patent/EP1921600A1/fr
Publication of EP1921600A1 publication Critical patent/EP1921600A1/fr
Ceased legal-status Critical Current

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Classifications

    • 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
    • G10K11/004—Mounting transducers, e.g. provided with mechanical moving or orienting device

Definitions

  • the invention concerns a transducer, e.g. a piezoelectric type transducer, which can be applied in a liquid environment, hereinafter called "underwater transducer"
  • the (piezoelectric) element of a state of the art transducer that is applied to generate ultrasound at high frequencies in e.g. water, may become damaged within a short time by the water penetrating the thin matching layer, e.g. made of an epoxy material, that is applied to adapt the acoustic impedance of the piezoelectric element to the acoustic impedance of the water.
  • the thin matching layer e.g. made of an epoxy material
  • the active electro/acoustical element may be a 100 ⁇ m thick piezoelectric composite element.
  • the element has a heavy backing at the non-radiating side.
  • An epoxy layer serves as the matching layer between acoustical impedances of the piezoelectric composite element and the water, to ensure efficient ultrasound radiation.
  • the layer thickness of e.g. 40 ⁇ m equals a quarter wavelength at the nominal radiation frequency.
  • the transducer's composite material is not easy to machine. That is a serious problem for shaping the radiating surface with the desired precision, in order to define radiation characteristics, like the directivity and focus.
  • Aim of the invention is to provide a cover layer that:
  • the cover layer is made by the polymer polyethyleneimine (PEI), is made by a derivative or mixture which is substantially based on that polymer polyethyleneimine or on its monomer, ethyleneimine, or is made by a copolymer of the monomer ethyleneimine and one or more other monomers. All of those PEI based material are considered to be fit for covering ultrasonic underwater transducers and are called PEI material hereinafter or indicated as PEI cover or PEI layer.
  • PEI polymer polyethyleneimine
  • the new PEI layer gives an effective protection against water, mainly because it can be much thicker than the prior art cover layer, however, without unacceptable damping. It is true that the relative thickness may introduce internal reflections, however, the layer is also thick enough to allow internal reflections to be discriminated and subsequently eliminated well by signal processing means.
  • the thickness of the PEI cover layer may be e.g. 2 mm (instead of 40 ⁇ m in the prior art), which is about 12 times the ultrasound wavelength.
  • PEI material enables a more robust (thicker) cover layer without unacceptable damping, having the advantage that it is well water-resistant and, besides, offering the opportunity that acoustic reflections can be discriminated well and thus eliminated by rather simple signal processing.
  • the PEI layer's outer surface can be given the desired shape with proper precision, for example flat or spherical; e.g. the outer surface can be shaped as an acoustic lens.
  • EP1073312 discloses the application of PEI as a cover layer for a non-ultrasonic transducer for non-underwater applications.
  • WO/2000/032013 discloses a similar application of PEI, viz. used as a transducer cover.
  • Figure 1 shows a lateral cross-section of an exemplary embodiment of an ultrasonic transducer according to the invention.
  • the ultrasonic transducer shown in figure 1 comprising a pi ⁇ zo ⁇ lectric electro/acoustical conversion element 1, called PEE hereinafter, which PEE 1 is fit for transmitting or receiving (or both) an ultrasonic signal of e.g. 15 MHz.
  • the PEE 1 is mounted on a heavy backing element 2 at the non-radiating side. Both are mounted within a housing 3.
  • a PEI cover layer 4, having e.g. a thickness of about 2 mm covers the PEE 1 and protects it from the liquid (e.g. water) during operation.
  • the housing provides a fastening edge 5.
  • the PEE 1 may be connected with a processor (not shown) via electical connections wires 6.
  • the ultrasonic transducer may be connected to a signal processor which is arranged to process ultrasonic signals which are received by the PEE 1 from other underwater transducers or are received back due to reflections of the transmitted signal from e.g. underwater objects.
  • the cover layer 4 may cause internal reflections when the PEE 1 transmits or receives signals.
  • the signal processor is arranged to discriminate those internal reflections inside the cover layer and to process those internal reflections in a proper way, e.g. by eliminating those signal reflections from the "normal" signals received from or transmitted to other ultrasonic transducers.

Landscapes

  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Acoustics & Sound (AREA)
  • Multimedia (AREA)
  • Transducers For Ultrasonic Waves (AREA)
EP06076994A 2006-11-08 2006-11-08 Transducteur à ultrasons Ceased EP1921600A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP06076994A EP1921600A1 (fr) 2006-11-08 2006-11-08 Transducteur à ultrasons

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP06076994A EP1921600A1 (fr) 2006-11-08 2006-11-08 Transducteur à ultrasons

Publications (1)

Publication Number Publication Date
EP1921600A1 true EP1921600A1 (fr) 2008-05-14

Family

ID=38276276

Family Applications (1)

Application Number Title Priority Date Filing Date
EP06076994A Ceased EP1921600A1 (fr) 2006-11-08 2006-11-08 Transducteur à ultrasons

Country Status (1)

Country Link
EP (1) EP1921600A1 (fr)

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4800317A (en) * 1986-08-11 1989-01-24 Medasonics, Inc. Ultrasonic transducer method and apparatus
US5747672A (en) * 1995-08-31 1998-05-05 Alcan International Limited Ultrasonic probes for use in harsh environments
WO2004040261A2 (fr) * 2002-10-28 2004-05-13 Biomondex, Ltd. Systeme d'analyse acoustique
US20040200056A1 (en) * 2001-02-28 2004-10-14 Masushita Electric Industrial Co., Ltd. Ultrasonic transducer, method for manufacturing ultrasonic transducer, and ultrasonic flowmeter

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4800317A (en) * 1986-08-11 1989-01-24 Medasonics, Inc. Ultrasonic transducer method and apparatus
US5747672A (en) * 1995-08-31 1998-05-05 Alcan International Limited Ultrasonic probes for use in harsh environments
US20040200056A1 (en) * 2001-02-28 2004-10-14 Masushita Electric Industrial Co., Ltd. Ultrasonic transducer, method for manufacturing ultrasonic transducer, and ultrasonic flowmeter
WO2004040261A2 (fr) * 2002-10-28 2004-05-13 Biomondex, Ltd. Systeme d'analyse acoustique

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