WO2009001306A3 - Acoustic device with a variable focal length - Google Patents

Acoustic device with a variable focal length Download PDF

Info

Publication number
WO2009001306A3
WO2009001306A3 PCT/IB2008/052541 IB2008052541W WO2009001306A3 WO 2009001306 A3 WO2009001306 A3 WO 2009001306A3 IB 2008052541 W IB2008052541 W IB 2008052541W WO 2009001306 A3 WO2009001306 A3 WO 2009001306A3
Authority
WO
WIPO (PCT)
Prior art keywords
acoustic
fluid media
viscosity
acoustic waves
focal length
Prior art date
Application number
PCT/IB2008/052541
Other languages
French (fr)
Other versions
WO2009001306A2 (en
Inventor
Szabolcs Deladi
Jan F. Suijver
Original Assignee
Koninklijke Philips Electronics N.V.
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 Koninklijke Philips Electronics N.V. filed Critical Koninklijke Philips Electronics N.V.
Publication of WO2009001306A2 publication Critical patent/WO2009001306A2/en
Publication of WO2009001306A3 publication Critical patent/WO2009001306A3/en

Links

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
    • G10K11/18—Methods or devices for transmitting, conducting or directing sound
    • G10K11/26—Sound-focusing or directing, e.g. scanning
    • G10K11/30—Sound-focusing or directing, e.g. scanning using refraction, e.g. acoustic lenses

Abstract

The invention relates to an acoustic device comprising an acoustic lens with variable focal length and means (11) for directing incoming acoustic waves onto thelens, wherein the acoustic lens comprises a first fluid medium (1) and a second fluid medium (2) that are not misciblewitheach other, in which the acoustic waves (21) have different velocities and with a contact meniscus (3) between the two fluid media (1,2), wherein the 5 difference in viscosity of the two fluid media (1,2) is such that the contact meniscus is substantiallyunperturbed by the acoustic waves (21). The invention is based on the experimental observation that the main physical parameter whichdetermines the interaction between the acoustic waves (21) and the contact meniscus (3) are the values of the viscosity ofthe two fluid media (1,2). Therefore, the perturbation of the contact meniscus (3) between 10 the two fluid media (1,2) by the acousticwaves (21) is reduced considerably when the values ofthe viscosity of the two fluid media (1,2) are selected appropriately leading to an increased controlofthe functioning of the acoustic lens.
PCT/IB2008/052541 2007-06-28 2008-06-25 Acoustic device with a variable focal length WO2009001306A2 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
EP07111308 2007-06-28
EP07111308.8 2007-06-28

Publications (2)

Publication Number Publication Date
WO2009001306A2 WO2009001306A2 (en) 2008-12-31
WO2009001306A3 true WO2009001306A3 (en) 2010-03-25

Family

ID=40186109

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/IB2008/052541 WO2009001306A2 (en) 2007-06-28 2008-06-25 Acoustic device with a variable focal length

Country Status (1)

Country Link
WO (1) WO2009001306A2 (en)

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5305755A (en) * 1991-03-12 1994-04-26 Fujitsu Limited Ultrasonic probe, having transducer array capable of turning around its aperture axis and having a convex lens comprising a viscous resin
DE19704940C1 (en) * 1997-02-10 1998-01-22 Stn Atlas Elektronik Gmbh Acoustic lens or prism device for sonar apparatus
WO2003069380A1 (en) * 2002-02-14 2003-08-21 Koninklijke Philips Electronics N.V. Variable focus lens
WO2005122139A2 (en) * 2004-06-07 2005-12-22 Koninklijke Philips Electronics N.V. Acoustic device with variable focal length

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5305755A (en) * 1991-03-12 1994-04-26 Fujitsu Limited Ultrasonic probe, having transducer array capable of turning around its aperture axis and having a convex lens comprising a viscous resin
DE19704940C1 (en) * 1997-02-10 1998-01-22 Stn Atlas Elektronik Gmbh Acoustic lens or prism device for sonar apparatus
WO2003069380A1 (en) * 2002-02-14 2003-08-21 Koninklijke Philips Electronics N.V. Variable focus lens
WO2005122139A2 (en) * 2004-06-07 2005-12-22 Koninklijke Philips Electronics N.V. Acoustic device with variable focal length

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
GELEST: "Silicone Fluids: stable inert media", GELEST, INC., 2004, pages 1 - 25, XP002562281 *

Also Published As

Publication number Publication date
WO2009001306A2 (en) 2008-12-31

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