DE4418830C2 - Method and device for producing spherical waves in the ultrasonic range - Google Patents

Method and device for producing spherical waves in the ultrasonic range

Info

Publication number
DE4418830C2
DE4418830C2 DE4418830A DE4418830A DE4418830C2 DE 4418830 C2 DE4418830 C2 DE 4418830C2 DE 4418830 A DE4418830 A DE 4418830A DE 4418830 A DE4418830 A DE 4418830A DE 4418830 C2 DE4418830 C2 DE 4418830C2
Authority
DE
Germany
Prior art keywords
funnel
tube
characterized
wave
device according
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.)
Expired - Fee Related
Application number
DE4418830A
Other languages
German (de)
Other versions
DE4418830A1 (en
Inventor
Wieslaw Dipl Ing Bicz
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.)
Sonident Anstalt
Original Assignee
Sonident Anstalt
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 Sonident Anstalt filed Critical Sonident Anstalt
Priority to DE4418830A priority Critical patent/DE4418830C2/en
Priority claimed from CA002191695A external-priority patent/CA2191695A1/en
Publication of DE4418830A1 publication Critical patent/DE4418830A1/en
Application granted granted Critical
Publication of DE4418830C2 publication Critical patent/DE4418830C2/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

Links

Classifications

    • GPHYSICS
    • G10MUSICAL INSTRUMENTS; ACOUSTICS
    • G10KSOUND-PRODUCING DEVICES; METHODS OR DEVICES FOR PROTECTING AGAINST, OR FOR DAMPING, NOISE OR OTHER ACOUSTIC WAVES IN GENERAL; ACOUSTICS NOT OTHERWISE PROVIDED FOR
    • G10K11/00Methods 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
    • G10K11/08Non-electric sound-amplifying devices, e.g. non-electric megaphones
    • AHUMAN NECESSITIES
    • A61MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61BDIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B5/00Detecting, measuring or recording for diagnostic purposes; Identification of persons
    • A61B5/117Identification of persons
    • A61B5/1171Identification of persons based on the shapes or appearances of their bodies or parts thereof
    • A61B5/1172Identification of persons based on the shapes or appearances of their bodies or parts thereof using fingerprinting
    • AHUMAN NECESSITIES
    • A61MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61BDIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B8/00Diagnosis using ultrasonic, sonic or infrasonic waves
    • A61B8/08Detecting organic movements or changes, e.g. tumours, cysts, swellings
    • A61B8/0858Detecting organic movements or changes, e.g. tumours, cysts, swellings involving measuring tissue layers, e.g. skin, interfaces
    • GPHYSICS
    • G10MUSICAL INSTRUMENTS; ACOUSTICS
    • G10KSOUND-PRODUCING DEVICES; METHODS OR DEVICES FOR PROTECTING AGAINST, OR FOR DAMPING, NOISE OR OTHER ACOUSTIC WAVES IN GENERAL; ACOUSTICS NOT OTHERWISE PROVIDED FOR
    • G10K11/00Methods 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
    • G10K11/18Methods or devices for transmitting, conducting, or directing sound
    • G10K11/22Methods or devices for transmitting, conducting, or directing sound for conducting sound through hollow pipes, e.g. speaking tubes

Description

The invention relates to a method for producing perfect Spherical waves in the ultrasound range and on a device for generating them Spherical waves.

In order to be able to produce the best possible spherical wave in the ultrasound range, you have to have a very small transmitter according to the prior art use that has a low sound intensity. Experience shows however, that even with small transmitters no in-phase waves are sent become. A phase wave is a wave, the first of which Wavefront has a perfect spherical shape and also the following wave fronts run parallel to it.  

A perfect spherical wave is important for all ultrasound devices if the phase of the wave must be taken into account. All ultrasound machines are used by Use of perfect spherical waves significantly improved.

The object underlying the invention is a method and a Propose a device for generating ultrasound waves in the MHz range, whose first wavefront has a perfect spherical shape and also that subsequent wave fronts. In addition, the intensity of the sound with the Distance from the axis of symmetry fall evenly, so preferably one Represent Gaussian distribution using the known classical methods and Devices can hardly be reached. A Gaussian distribution is therefore preferred because the intensity is greatest in the middle of the wave and at the Pages drop off sharply. A too high intensity in the edge area can cause unwanted interference.

In WO-91/05331 a device is described which is in the ultrasonic range concentrates the intensity and adjusts the impedances. This is the sound wave from a transducer that is significantly smaller than the wavelength of the sound wave, in a truncated cone made of solid material and then ge in a plate give that forms a wave of high intensity. This device works with Airborne sound in the range of 60 KHz and not in the MHz range and only produces flat ones and focused waves, but not spherical waves. In the book "Technical Acoustics selected chapter ", 3rd edition 1982, pages 18-24 is the generation of Ball waves are only described for the range up to 10 KHz and not for the MHz range.  

The object is achieved by the in the characterizing part of Features contained claim 1 solved. Then there is a compression of the ultrasound wave emanating from an ultrasound transmitter through this surrounding Influences up to a single-modal waveguide. At the end of the waveguide, the Ultrasonic wave emitted as a perfect spherical wave in free space. The According to the invention, the emitted wave is caused by the matter surrounding it subject to interference. The compaction of the ultrasound transducer outgoing wave is slow and continuous.

The device for performing this method is as follows builds. It will be a normal ultrasonic transducer with a relatively large one Diameter of a few millimeters used. The wave that such a converter emits is not homogeneous, d. H. both their spatial and their temporal Distribution (amplitude and phase) are far from a plane wave or spherical wave away. According to the invention, this ultrasonic transducer is in the transmission direction a funnel connected, which ends in a tube. The pipe has a diameter of approximately 10 wavelengths of the ultrasonic wave. Of the Funnel is best designed so that the entire wave energy in the Pipe, which then acts like a single-modal waveguide, and the shaft, which leaves the waveguide then behaves as if it came from a point would be sent. It is perfectly in phase, i. H. it is a perfect spherical wave and also has the desired Gaussian intensity distribution. A perfect spherical wave is such an ultrasonic wave in which the phase of each wave front has the area of a sphere. As a result of the possibilities given by the invention  ability to use a large transmitter becomes the one available Energy of the sound wave by a substantial amount compared to a normal one Point source increased.  

The funnel and the tube according to the invention exist preferably from a solid. It turned out asked that a sound absorbing material, preferred wise plastic, is particularly suitable. The funnel and the tube can be in a liquid bath or in a Be arranged gas atmosphere. It is also possible Funnel and the tube inside and outside of a solid to be surrounded. The length of the waveguide Rohres measures himself according to such a leadership of the Ultra  sound wave that at the end of the tube, as already mentioned, perfect spherical waves emerge. The pipe can be any be bent and guided so that the starting point of the Ball shaft can be placed as desired.

There is also the option of replacing the trich ter the subsequent tube the compressed wave one other waveguides such. B. a fiber optic wire after To exit the funnel.

It has been shown that the ultrasonic transducer according to Er finding in a fairly large frequency spectrum, e.g. B. from 2 to 10 MHz, produces perfect spherical waves.

In the accompanying drawing, the device or the transducer is shown, the ultrasonic transmitter bears the reference number 1 , the energy and the sound wave bundling and compressing funnel, the reference number 2 and the tube connecting as a waveguide to the funnel de tube with 3 designated. The spherical waves emerging as the waveguide from the tube 3 are shown as an arc.

Claims (8)

1. Method for producing spherical waves in the ultrasound range of 2 and more MHz, characterized by a known compression of the ultrasound wave emanating from the ultrasound wave transmitter in the 2-10 MHz range by this surrounding influences to a single-mode waveguide, whose diameter is on the order of 10 Wel lenlonger the transmitted wavelength that at the end of the ultrasonic wave will give as a spherical wave in the free space.
2. Device for producing spherical waves in the ultrasonic range of over 2 MHz, characterized in that a funnel ( 2 ) is assigned to the ultrasonic transmitter ( 1 ) for the ultrasonic range from 2 to 10 MHz, which funnel ( 2 ) at its end in a tube ( 3 ) expires, the diameter of which is in the order of 10 wavelengths of the transmitted ultrasound wave.
3. Apparatus according to claim 2, characterized in that the funnel ( 2 ) runs out instead of in a tube in a correspondingly dimensioned waveguide.
4. The device according to claim 3, characterized in that the funnel ( 2 ) and the tube ( 3 ) consist of a solid by.
5. The device according to claim 4, characterized in that the funnel ( 2 ) and the tube ( 3 ) consist of a sound absorbing material, preferably plastic.
6. The device according to claim 2, characterized in that the funnel ( 2 ) and the tube ( 3 ) in a liquid bath or a gas atmosphere are arranged.
7. The device according to claim 2, characterized in that the funnel ( 2 ) and the tube ( 3 ) are surrounded by a solid.
8. Device according to one of the preceding claims, characterized in that the tube ( 3 ) is straight or curved.
DE4418830A 1994-05-30 1994-05-30 Method and device for producing spherical waves in the ultrasonic range Expired - Fee Related DE4418830C2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
DE4418830A DE4418830C2 (en) 1994-05-30 1994-05-30 Method and device for producing spherical waves in the ultrasonic range

Applications Claiming Priority (9)

Application Number Priority Date Filing Date Title
DE4418830A DE4418830C2 (en) 1994-05-30 1994-05-30 Method and device for producing spherical waves in the ultrasonic range
CA002191695A CA2191695A1 (en) 1994-05-30 1995-05-29 Process and device for generating spherical waves in the ultrasound range
DE1995507746 DE59507746D1 (en) 1994-05-30 1995-05-29 Method and device for producing ball shafts in the ultrasound area
EP19950921769 EP0767949B1 (en) 1994-05-30 1995-05-29 Process and device for generating spherical waves in the ultrasound range
PL95317371A PL177501B1 (en) 1994-05-30 1995-05-29 Method of and apparatus for generating spherical waves within us frequency range
JP50030796A JP3352696B2 (en) 1994-05-30 1995-05-29 Method and apparatus for generating spherical waves in the ultrasonic range
PCT/EP1995/002031 WO1995033258A1 (en) 1994-05-30 1995-05-29 Process and device for generating spherical waves in the ultrasound range
DK95921769T DK0767949T3 (en) 1994-05-30 1995-05-29 Method and apparatus for producing spherical waves in the ultrasonic region
US08/725,351 US5828627A (en) 1994-05-30 1996-09-26 Method of and apparatus for producing spherical waves in the ultrasonic range

Publications (2)

Publication Number Publication Date
DE4418830A1 DE4418830A1 (en) 1995-12-07
DE4418830C2 true DE4418830C2 (en) 1999-04-08

Family

ID=6519318

Family Applications (1)

Application Number Title Priority Date Filing Date
DE4418830A Expired - Fee Related DE4418830C2 (en) 1994-05-30 1994-05-30 Method and device for producing spherical waves in the ultrasonic range

Country Status (1)

Country Link
DE (1) DE4418830C2 (en)

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1991005331A1 (en) * 1989-10-06 1991-04-18 Consejo Superior Investigaciones Cientificas Electroacoustic unit for generating high sonic and ultrasonic intensities in gases and interphases

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1991005331A1 (en) * 1989-10-06 1991-04-18 Consejo Superior Investigaciones Cientificas Electroacoustic unit for generating high sonic and ultrasonic intensities in gases and interphases

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
"Technische Akustik-Ausgewählte Kapitel", 3. Aufl., 1982, expert verlag, S. 18-24 *

Also Published As

Publication number Publication date
DE4418830A1 (en) 1995-12-07

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D2 Grant after examination
8364 No opposition during term of opposition
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