EP1293960A2 - Ultraschallwellensende- bzw. -empfangsvorrichtung mit einem Ultraschallwandler und einem Ultraschallwellenleiter - Google Patents
Ultraschallwellensende- bzw. -empfangsvorrichtung mit einem Ultraschallwandler und einem Ultraschallwellenleiter Download PDFInfo
- Publication number
- EP1293960A2 EP1293960A2 EP02017112A EP02017112A EP1293960A2 EP 1293960 A2 EP1293960 A2 EP 1293960A2 EP 02017112 A EP02017112 A EP 02017112A EP 02017112 A EP02017112 A EP 02017112A EP 1293960 A2 EP1293960 A2 EP 1293960A2
- Authority
- EP
- European Patent Office
- Prior art keywords
- ultrasonic
- ultrasonic wave
- jacket
- receiving device
- transducer
- 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.)
- Withdrawn
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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
- B06B3/00—Methods or apparatus specially adapted for transmitting mechanical vibrations of infrasonic, sonic, or ultrasonic frequency
-
- 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 relates to an ultrasonic wave transmitter or receiver, with an ultrasonic transducer, an ultrasonic waveguide and a Sheath, the ultrasound waveguide being arranged within the sheath the ultrasonic transducer is arranged at one end of the ultrasonic waveguide and from the ultrasonic transducer at this end of the ultrasonic waveguide Ultrasound waves can be transmitted to or received by the latter are.
- Such ultrasonic wave transmitters or receivers are e.g. B. in Ultrasonic flow meters and in vortex frequency flow meters used. Piezo crystals are typically used as ultrasonic transducers used with which ultrasonic waves can be generated or detected.
- an ultrasonic wave transmitter or receiver it would be possible to use only an ultrasonic transducer with which Ultrasonic waves can be generated or detected.
- ultrasonic transducers can be arranged directly where the ultrasonic waves to be coupled in or detected.
- this is problematic in that than that piezocrystals, as stated previously, typically used for ultrasonic transducers, above a certain temperature, the so-called Curie temperature, can no longer be used.
- e.g. B the prerequisite for piezoelectric properties of the crystal.
- the flow measured with the ultrasonic flow meter should be very hot, so that its temperature is above the Curie temperature of the piezo crystal, there is a certain requirement for reliable operation thermal insulation of the ultrasonic transducer from the hot medium required. For this reason, ultrasonic wave transmission or Receiving devices used ultrasonic waveguide, the one hand heat insulation of the ultrasound transducer as good as possible from the hot medium and on the other hand a lossless and undisturbed transmission of the ultrasonic signal should ensure.
- an ultrasonic waveguide can then generate ultrasonic waves generated by an ultrasonic transducer be coupled into the flowing medium or by the ultrasonic transducer ultrasonic waves are extracted from the hot medium, while the ultrasound transducer is physically distant from the hot medium and is at least to some extent thermally insulated from it.
- Such an ultrasonic waveguide is known from EP 1 098 295, which consists of a rolled-up foil, which fits into a metallic Tube is inserted. It is provided that for the transmission of ultrasonic waves the layer thickness in the frequency range from 15 kHz to 20 MHz the film is less than 0.1 mm. The material used for this film is typically used a metal.
- the ultrasonic wave transmitting / receiving devices with those previously described Ultrasonic waveguides have in common that at one end of the ultrasonic waveguide the ultrasonic transducer is arranged such that the Ultrasonic transducer can be coupled into the ultrasonic waveguide or can be received by it. This is typically the case proceeded that the ultrasound transducer directly, i.e. with physical contact, is placed on one end of the ultrasonic waveguide.
- the previous one described ultrasound waveguide is made of a rolled-up film generally provided that the ends of the ultrasonic waveguide are welded and are face to face. The ultrasonic transducer is then on this welded and face-turned surface of the ultrasonic waveguide.
- the problem with the ultrasonic wave transmission devices described above is that ultrasonic waves generated by the ultrasonic transducer not only coupled into the ultrasonic waveguide but also into the jacket surrounding the ultrasonic waveguide.
- the ultrasound transducer is provided for the detection of ultrasound waves when there is an ultrasonic wave receiving device. Then get there namely ultrasound waves not only through the ultrasound waveguide but also over the jacket to the ultrasonic transducer. So it comes in Case that on the one hand an ultrasonic wave transmitter and on the other hand an ultrasonic wave receiving device is provided for that not only ultrasonic waves emitted or detected via the ultrasonic waveguide but also sent or received via the respective coat Ultrasonic waves are detected.
- the ultrasonic wave transmission or receiving device via its jacket z.
- T 4 (e.g. 1 / z 2 ) / (1 + z 1 / z 2 ) 2 ,
- z 1 and z 2 represent the characteristic impedances of the first and second medium, between which the transition of the ultrasonic waves takes place.
- the aforementioned transmission coefficient T is approximately 0.004%. This corresponds to the fact that a substantial part of the acoustic energy, namely 99.996%, is lost. A significant part of this lost energy is found in the unwanted cross coupling.
- the cross coupling thus essentially determines the signal-to-noise ratio of a measuring device working with ultrasonic wave transmitting and / or receiving devices.
- the object of the invention is an ultrasonic wave transmission Specify or receive device with the unwanted cross-coupling are largely avoidable.
- the impedance jump provided according to the invention thus makes a Achieved area of the shell of the ultrasonic wave transmission device in which Ultrasound waves unwanted in the jacket by the ultrasound transducer are severely weakened.
- an inventive Ultrasonic wave receiving device achieved a range in which Coat of the ultrasonic wave receiving device detected to the ultrasonic transducer guided ultrasonic waves are greatly weakened.
- the ultrasound waves that travel over the jacket must Pass impedance jump, once coming from the ultrasonic transducer and once to the ultrasonic transducer, depending on the Size of the impedance jump a weakening of the intensity of the ultrasonic waves essentially according to the formula given above for the Transmission coefficient takes place.
- Such an impedance jump according to the invention in the cladding of the ultrasonic wave transmission or receiving device can be realized in different ways become.
- for. B. provided that the jacket is spaced from the ultrasonic transducer is. In this way, the ultrasonic transducer is directly facing At the end of the mantle an air gap is realized, which, as referenced above executed on the transmission coefficient, to very considerable Damping leads.
- it is according to a preferred one Development of the invention provides that the distance range with a different from the material of the jacket and from the material of the ultrasonic transducer Material is filled. This is particularly advantageous if a geometrically uniform transition from the ultrasonic transducer to the Jacket of the ultrasonic wave transmission or reception device required a recess is not permitted.
- the Impedance jump provided in the jacket itself is e.g. B. thereby realizable, that the impedance jump is formed by a recess in the jacket becomes.
- the recess may, for. B. one or more holes Holes must be formed. These can only be blind holes also be through holes that extend over the entire thickness of the Stretch coat.
- the recess can also be of one, preferably circumferential, groove be formed. With regard to this groove, it is also possible that it extends over the entire thickness of the jacket, but the groove can extend extend only over part of the thickness of the jacket. In particular in this context it is possible that the groove along its circumference is different depth.
- the ultrasonic wave transmission used or receiving device in a measuring device which contains or contains a medium such as a gas or a liquid has a leading container.
- a medium containing or leading Containers come in particular into a tank or a pipe. So z. B. as a medium-leading container a tube for an ultrasonic flow meter conceivable.
- a measuring device is now in accordance the preferred development of the invention provides that a previously described Ultrasonic wave transmission device and / or a previously described Ultrasonic wave receiving device above that of the ultrasonic transducer area of the jacket facing away from the wall of the container is.
- the ultrasound wave transmission device and / or the ultrasonic wave receiving device directly in the wall of the container to fix.
- a flange is provided for the ultrasonic wave receiving device
- an additional attenuation of the cross coupling can be achieved that between the flange and the jacket of the ultrasonic wave transmitter or the ultrasonic wave receiving device, a damping ring is provided.
- the material for the damping ring should turn care should be taken to ensure that the greatest possible jump in impedance occurs. Since the jacket of the ultrasonic wave transmitting or receiving device is typically made of a metal and the wall of the container typically also made of metal, come for the damping ring typically plastic or rubber materials.
- Fig. 1 is an ultrasonic wave transmission or reception device according to a first preferred embodiment of the invention in comparison with a conventional ultrasonic wave transmitter or receiver seen.
- the ultrasonic wave transmitting or receiving device shown on the right in FIG. 1 according to the first preferred embodiment of the invention has an ultrasound transducer 1, an ultrasound waveguide 2 and a jacket 3 that surrounds the ultrasonic waveguide 2.
- the ultrasonic waveguide 2 consists of a thin rolled-up metal foil, whose thickness is about 0.1 mm and the ends 4 turned and are welded.
- a flange 5 is welded to the jacket 3.
- this Flange 5 can be the ultrasonic wave transmitting or receiving device according to the first preferred embodiment of the invention, as in Fig. 1 not shown, for. B. attached to a measuring tube Fix the connection flange.
- the jacket 3 like the ultrasound waveguide 2, from a metal.
- a recess 6 provided in the jacket 3 is above the flange 5, that is in one region of the jacket 3 facing the ultrasonic transducer 1, a recess 6 provided.
- This recess 6 is designed as a circumferential groove 3 and extends over the entire thickness of the jacket 3.
- conventional ultrasonic wave transmitters can or receiving device coupled into the jacket 3 Ultrasonic waves directly over the flange 5 in the not shown Wall of the measuring tube into which the ultrasonic wave transmitting or receiving device is installed, transmitted.
- this direct route via the jacket adjacent to the ultrasonic transducer 1 3 in the ultrasonic wave receiving device according to the first preferred embodiment of the invention due to the recess 6 essentially denied in the jacket 3.
- Ultrasonic waves can only over the flange 5 into the wall of the measuring tube, not shown arrive by completely passing through the ultrasonic waveguide 2 and at its end 4 facing away from the ultrasound transducer 1 into the jacket 3 couple, then after running back in the jacket 3 towards the Finally, couple the ultrasonic transducer 1 into the flange 5.
- the intensity is coupled into the measuring tube via the flange 5 Ultrasonic waves are much lower, however, on the other hand also the path of the ultrasonic waves causing the cross coupling in this way much longer, so that the originating from the cross coupling Interference signal is expected to be significantly after the actual measurement signal can be directly from the ultrasonic wave transmitter to the Ultrasonic wave receiving device is running. This is discrimination of the measurement signal against interference much easier.
- FIG. 2 is now an ultrasonic wave transmitting or receiving device according to a second preferred embodiment of the invention.
- the structure of this corresponds essentially to that shown in FIG. 1
- Ultrasonic wave transmitting or receiving device according to the first preferred embodiment of the invention except for the fact that the recess 6 is filled with a material 7 that of the material of the jacket 3 and the material of the ultrasonic transducer 1 different is.
- a plastic material is selected for filling the recess 6 Service.
- the recess 6 can namely in shape of bores, in the form of an oblique groove over a partial circumference of the jacket 3 or in the form of an oblique groove be provided, which extends over the entire peripheral region of the jacket 3.
- Fig. 6 it can be seen how ultrasonic wave or receiving devices according to the first preferred embodiment described above the invention in a measuring tube 8 of an ultrasonic wave flow meter are installed, namely in each case via a connecting flange 9.
- Fig. 6 it is shown that the path of the cross coupling ultrasonic waves of the one ultrasonic transducer 1 via the flange 5 of the Ultrasonic wave transmission device, the one connecting flange 9, the wall 10 of the measuring tube 8, the other connecting flange 9, the flange 5 of the Ultrasonic wave receiving device to the other ultrasonic transducer 1 is significantly longer than the direct route via the respective ultrasonic transducers 1 opposite ends 4 of the ultrasonic waveguide 2 of the ultrasonic wave transmission device or the ultrasonic wave receiving device. For this reason, the ultrasonic waves corresponding to the cross coupling hit time clearly after the actual measurement signal, so that the measurement signal discriminates relatively easily compared to the cross coupling can be selected if a pulse mode is selected.
- FIG. 7 shows how an ultrasonic wave transmitting or receiving device according to the first preferred embodiment described above the invention via a damping ring 11 in the wall 12 of a container is installed.
- the damping ring 11 is in the present case a rubber material, so that additional damping of the Cross coupling constituting ultrasonic waves takes place.
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- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Acoustics & Sound (AREA)
- Multimedia (AREA)
- Mechanical Engineering (AREA)
- Measuring Volume Flow (AREA)
- Transducers For Ultrasonic Waves (AREA)
- Geophysics And Detection Of Objects (AREA)
Abstract
Description
- Fig.1
- eine Ultraschallwellensende- bzw. -empfangsvorrichtung gemäß einem ersten bevorzugten Ausführungsbeispiel der Erfindung im Vergleich mit einer herkömmlichen Ultraschallwellensende- bzw. -empfangsvorrichtung,
- Fig. 2
- eine Ultraschallwellensende- bzw. -empfangsvorrichtung gemäß einem zweiten bevorzugten Ausführungsbeispiel der Erfindung,
- Fig. 3
- Modifikationen der Ausnehmung in dem Mantel der Ultraschallwellensende- bzw. -empfangsvorrichtung gemäß dem ersten bzw. dem zweiten bevorzugten Ausführungsbeispiel der Erfindung,
- Fig. 4
- eine Ultraschallwellensende- bzw. -empfangsvorrichtung gemäß einem dritten bevorzugten Ausführungsbeispiel der Erfindung,
- Fig. 5
- eine Ultraschallwellensende- bzw. -empfangsvorrichtung gemäß einem vierten bevorzugten Ausführungsbeispiel der Erfindung,
- Fig. 6
- den Einbau von Ultraschallwellensende- bzw. -empfangsvorrichtungen gemäß dem ersten bevorzugten Ausführungsbeispiel der Erfindung in ein Meßrohr eines Ultraschallwellendurchflußmeßgeräts und
- Fig. 7
- die Anordnung der Ultraschallwellensende- bzw. -empfangsvorrichtung gemäß dem ersten bevorzugten Ausführungsbeispiel der Erfindung in der Wandung eines Behältnisses über einen Dämpfungsring.
Claims (9)
- Ultraschallwellensende- bzw. -empfangsvorrichtung, mit einem Ultraschallwandler (1), einem Ultraschallwellenleiter (2) und einem Mantel (3), wobei der Ultraschallwellenleiter (2) innerhalb des Mantels (3) angeordnet ist, der Ultraschallwandler (1) an einem Ende (4) des Ultraschallwellenleiters (2) angeordnet ist und von dem Ultraschallwandler (1) an diesem Ende (4) des Ultraschallwellenleiters (2) Ultraschallwellen auf diesen übertragbar bzw. von diesem empfangbar sind, dadurch gekennzeichnet, daß zwischen dem Ultraschallwandler (1) und dem dem Ultraschallwandler (1) abgewandten Bereich des Mantels (3) ein Impedanzsprung vorgesehen ist.
- Ultraschallwellensende- bzw. -empfangsvorrichtung nach Anspruch 1, dadurch gekennzeichnet, daß der Mantel (3) im Abstand vom Ultraschallwandler (1) angeordnet ist.
- Ultraschallwellensende- bzw. -empfangsvorrichtung nach Anspruch 2, dadurch gekennzeichnet, daß der Abstandsbereich mit einem vom Material des Mantels (3) und vom Material des Ultraschallwandlers (2) verschiedenen Material gefüllt ist.
- Ultraschallwellensende- bzw. -empfangsvorrichtung nach Anspruch 1, dadurch gekennzeichnet, daß der Impedanzsprung von einer Ausnehmung (6) in dem Mantel (3) gebildet ist.
- Ultraschallwellensende- bzw. -empfangsvorrichtung nach Anspruch 4, dadurch gekennzeichnet, daß die Ausnehmung (6) von wenigstens einer Bohrung gebildet ist.
- Ultraschallwellensende- bzw. -empfangsvorrichtung nach Anspruch 4, dadurch gekennzeichnet, daß die Ausnehmung (6) von einer, vorzugsweise umlaufenden, Nut gebildet ist.
- Ultraschallwellensende- bzw. -empfangsvorrichtung nach einem der Ansprüche 4 bis 6, dadurch gekennzeichnet, daß die Ausnehmung (6) wenigstens teilweise mit einem von dem Material des Mantels (3) und vom Material des Ultraschallwandlers (1) verschiedenen Material (7) gefüllt ist.
- Meßgerät, mit einem ein Medium enthaltenden bzw. führenden Behältnis, dadurch gekennzeichnet, daß eine Ultaschallwellensendevorrichtung oder/und eine Ultraschallwellenempfangsvorrichtung nach einem Ansprüche 1 bis 7 über den dem Ultraschallwandler (1) abgewandten Bereich des Mantels (3) in der Wandung (8, 12) des Behältnisses befestigt ist.
- Meßgerät nach Anspruch 8, dadurch gekennzeichnet, daß zur Befestigung der Ultraschallwellensendevorrichtung oder/und der Ultraschallwellenempfangsvorrichtung ein Flansch (9) vorgesehen ist und zwischen dem Flansch (9) und dem Mantel (3) der Ultraschallwellensendevorrichtung bzw. der Ultraschallwellenempfangsvorrichtung ein Dämpfungsring (11) vorgesehen ist.
Applications Claiming Priority (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE10145429 | 2001-09-14 | ||
DE10145429 | 2001-09-14 | ||
DE10153297 | 2001-10-31 | ||
DE10153297A DE10153297C2 (de) | 2001-09-14 | 2001-10-31 | Meßgerät |
Publications (2)
Publication Number | Publication Date |
---|---|
EP1293960A2 true EP1293960A2 (de) | 2003-03-19 |
EP1293960A3 EP1293960A3 (de) | 2004-09-08 |
Family
ID=26010148
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP02017112A Withdrawn EP1293960A3 (de) | 2001-09-14 | 2002-07-30 | Ultraschallwellensende- bzw. -empfangsvorrichtung mit einem Ultraschallwandler und einem Ultraschallwellenleiter |
Country Status (4)
Country | Link |
---|---|
US (1) | US6669636B2 (de) |
EP (1) | EP1293960A3 (de) |
JP (1) | JP2003106880A (de) |
NO (1) | NO328855B1 (de) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US8205507B2 (en) | 2007-06-11 | 2012-06-26 | Forschungszentrum Dresden-Rossendorf E.V. | Ultrasonic sensor for measuring flow rates in liquid melts |
US8630814B2 (en) | 2011-01-31 | 2014-01-14 | Xylem IP Holdings LLC. | Ultrasonic water level gauge and control device |
Families Citing this family (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2006005631A (ja) * | 2004-06-17 | 2006-01-05 | Alps Electric Co Ltd | 音波増幅器 |
US8090131B2 (en) * | 2007-07-11 | 2012-01-03 | Elster NV/SA | Steerable acoustic waveguide |
CN103052362B (zh) * | 2010-12-17 | 2015-07-15 | 奥林巴斯医疗株式会社 | 用于处理活体组织的探头及超声波探头的驱动方法 |
US9234777B2 (en) | 2012-11-05 | 2016-01-12 | General Electric Company | Ultrasonic signal coupler |
US9151651B2 (en) * | 2013-01-14 | 2015-10-06 | General Electric Company | Apparatus and method for determining temperature |
DE102014004747B4 (de) | 2013-10-30 | 2023-02-16 | Krohne Ag | Ultraschall-Durchflussmesser |
Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5159838A (en) * | 1989-07-27 | 1992-11-03 | Panametrics, Inc. | Marginally dispersive ultrasonic waveguides |
US5945642A (en) * | 1998-03-13 | 1999-08-31 | Minnesota Mining And Manufacturing Company | Acoustic horn |
EP1098295A2 (de) * | 1999-11-03 | 2001-05-09 | Krohne AG | Ultraschallwellenleiter |
Family Cites Families (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0835444A4 (de) | 1995-06-07 | 1998-11-18 | Panametrics | Ultraschall wegbündel und -system |
US6047602A (en) | 1996-10-29 | 2000-04-11 | Panametrics, Inc. | Ultrasonic buffer/waveguide |
-
2002
- 2002-07-30 EP EP02017112A patent/EP1293960A3/de not_active Withdrawn
- 2002-09-10 US US10/238,697 patent/US6669636B2/en not_active Expired - Fee Related
- 2002-09-12 JP JP2002267027A patent/JP2003106880A/ja active Pending
- 2002-09-13 NO NO20024403A patent/NO328855B1/no not_active IP Right Cessation
Patent Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5159838A (en) * | 1989-07-27 | 1992-11-03 | Panametrics, Inc. | Marginally dispersive ultrasonic waveguides |
US5945642A (en) * | 1998-03-13 | 1999-08-31 | Minnesota Mining And Manufacturing Company | Acoustic horn |
EP1098295A2 (de) * | 1999-11-03 | 2001-05-09 | Krohne AG | Ultraschallwellenleiter |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US8205507B2 (en) | 2007-06-11 | 2012-06-26 | Forschungszentrum Dresden-Rossendorf E.V. | Ultrasonic sensor for measuring flow rates in liquid melts |
US8630814B2 (en) | 2011-01-31 | 2014-01-14 | Xylem IP Holdings LLC. | Ultrasonic water level gauge and control device |
Also Published As
Publication number | Publication date |
---|---|
EP1293960A3 (de) | 2004-09-08 |
NO20024403L (no) | 2003-03-17 |
JP2003106880A (ja) | 2003-04-09 |
US20030055340A1 (en) | 2003-03-20 |
US6669636B2 (en) | 2003-12-30 |
NO328855B1 (no) | 2010-05-31 |
NO20024403D0 (no) | 2002-09-13 |
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