WO1999010110A1 - Ultrasonic transducer - Google Patents
Ultrasonic transducer Download PDFInfo
- Publication number
- WO1999010110A1 WO1999010110A1 PCT/DK1998/000358 DK9800358W WO9910110A1 WO 1999010110 A1 WO1999010110 A1 WO 1999010110A1 DK 9800358 W DK9800358 W DK 9800358W WO 9910110 A1 WO9910110 A1 WO 9910110A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- cable
- ultrasonic transducer
- piezo
- conductor
- disc
- Prior art date
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
- G10K11/004—Mounting transducers, e.g. provided with mechanical moving or orienting device
Definitions
- the invention relates to an ultrasonic transducer with a cylinder-shaped housing having a plane bottom, which housing encases a piezo-electric ceramic disc bearing on the housing bottom, the housing bottom forming a first electrical connection to the piezo-electric ceramic disc, with a spring bearing on the piezo-electric ceramic disc, and opposite the piezo-electric ceramic disc the spring has contact with an electrically conducting means, the spring forming a second electrical connection between the piezo-electric ceramic disc and the electrically conducting means.
- DE 43 30 745 Cl describes an ultrasonic transducer having a cylinder-shaped housing with a plane bottom on which the piezo-electric ceramic disc bears.
- the bottom of the housing has a circle-shaped groove along the housing wall for admission of a soldering for electrical connection to one of the terminals of the piezo-electric ceramic disc.
- the fact that the groove extends along the wall causes that the piezo- electric ceramic disc can be placed without considering the placing of the soldering point.
- the solderings will put a limit to the maximum temperature, which the transducer can stand.
- the short-circuiting between the conducting means and the locking means can be effected with a conducting sealing closing the transducer tightly towards the surroundings. This ensures that foreign matters are prevented from reaching the inside of the transducer, when the cable holder is dismounted.
- the transducer housing can be welded onto a pipe construction long before fitting the rest of the flow transmitter.
- the thickness of the housing bottom can be adapted to the ultrasonic wave length of the housing material.
- the piezo disc oscillates on a resonant frequency of the housing bot- torn, so that transmission of oscillations through the bottom takes place with small losses.
- the cable can be mounted in a holder screwed into the housing, said holder having means for cable force release and forming the first electrical connection from the first conductor of the cable to the housing by bearing of a flange on the locking means, whereas the second conductor of the cable forms the second electrical connection through a central projection on the holder, the projection of the holder and the centre electrode pressing the disc away from the locking means while screwing in the holder at simultaneous compression of the spring.
- the projection of the holder can be made by an isolator disc with a central opening for admission of the second conductor of the cable and of a pressure shoe, which is conducting and which also has a central opening for the admission of the second conductor of the cable. This gives a direct connection from the second conductor of the cable to the conducting means and on through the spring to the piezo disc.
- the flange of the holder can be made with a neck with an opening for admission of the second conductor of the cable and the cable isolation, whereas the first conductor of the cable extends externally on the neck of the flange, whereby the flange neck and the first conductor can be surrounded by a pipe.
- the cable has a first section, which is high temperature resistant, said first cable section being connected with a second cable section by way of a cable assembly, which contains an electronic circuit.
- a cable assembly which contains an electronic circuit.
- the electronic circuit of the cable assembly comprises a coil for impedance adaptation and for adaptation of a resonant system.
- the piezo-electric ceramic disc together with the coil forms an oscillation circuit, whose resonant frequency coincides with the signal with which the oscillation circuit is supplied.
- the electronic circuit can have means for both amplification and impedance conversion, in the direction of both the transducer and the connection cable.
- the length of the cables between the electronic unit and the transducer is uncritical.
- Fig. 1 a section through a transducer housing
- Fig. 2 a section through a transducer with fitted cable
- Fig. 3 cable connection and cable assembly of the transducer.
- Fig. 1 shows a transducer housing 2 with a bottom 3 forming a window for ultrasound, which is generated by a piezo-electric ceramic disc 4, which is retained to bearing against the bottom 3 by a compression spring 5.
- the spring 5 is led into a spring holder 6, and opposite to the piezo-electric disc 4 the spring 5 is bearing on a conducting means 7 pressed to bearing against a locking means 8 by the spring.
- the first electrical connection to the piezo-electric ceramic disc 4 is formed by means of the housing 2 and the bottom 3.
- the second electrical connection to the piezo disc 4 is formed by means of the spring 5, which extends in the isolating spring holder 6.
- Fig. 2 shows the ultrasonic transducer with fitted holder 13.
- the cable 9 has a first conductor 10, an isolation 11 and a second conductor 12. While screwing in the holder 13 a spring washer 18 presses the first conductor 10 to bearing against a conducting flange 14.
- the first conductor can also be fixed by means of a pipe 15, which is clamped around the cable 9 after fitting.
- the second conductor 12, which is isolated, passes through the flange 14 and on through an isolator 16 to contact with a thrust pad 17, the second conductor 12 here shown tucked away.
- the cable is further retained by means of a bush 19 clamped around the cable 9 by means of a union nut 20.
- Fig. 3 shows the cable holder 13 in the dismounted state - the cable 9 is fixed on the flange 14, the spring washer being shown in a not tightened state, as the spring washer is only tightened and clamping the first conductor of the cable against the flange 14 while screwing in the holder 13. A subsequent tightening of the union nut 20 will cause that the cable bush also tightens the cable 9.
- the cable 9 leads to a cable assembly 21, which may comprise an electronic circuit 22. From the electronic circuit 22 and the cable assembly 21 another cable 23 leads on towards the electronic calculation circuit, with which the ultrasonic transducer co-operates.
- the electronic circuit 22 may consist of a coil for impedance adaptation and for obtaining an oscillation circuit between the coil and the piezo-electric ceramic disc 4.
- the electronic circuit may also contain circuits for amplification and impedance conversion, both against the cable 9 and against the cable 23.
- the cable 23 can supply the required current for the electronic unit 22 simultaneously with the transfer of signals. By making the final signal treatment close to the ultrasonic transducer, the most expedient transmission form can be chosen via the cable 23, which can thus obtain a very large length, if required.
- the ultrasonic transducer is particularly suited for high pressures, as the bottom 3 together with the housing 2 can resist very high ambient pressures, and the embodiment of the ultrasonic transducer may make it particularly suited for extremely high temperatures, as at no time the cable connection requires soldering.
- the upper temperature limit will be determined by the cable used.
- ultrasonic transducers can work at temperatures of 400 to 500°, if the cable 9 is a special high temperature cable, whereas the cable 23 can be of an ordinary type, as this cable is assumed to be used where the ambient temperatures are relatively low.
Landscapes
- Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Acoustics & Sound (AREA)
- Multimedia (AREA)
- Transducers For Ultrasonic Waves (AREA)
- Measuring Fluid Pressure (AREA)
- Length Measuring Devices Characterised By Use Of Acoustic Means (AREA)
Abstract
Description
Claims
Priority Applications (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
AU87980/98A AU8798098A (en) | 1997-08-22 | 1998-08-19 | Ultrasonic transducer |
PL33873398A PL187955B1 (en) | 1997-08-22 | 1998-08-19 | Ultrasound transducer |
DE1998182623 DE19882623B4 (en) | 1997-08-22 | 1998-08-19 | Ultrasonic Transducers |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DK96597A DK172871B1 (en) | 1997-08-22 | 1997-08-22 | An ultrasonic transducer |
DK0965/97 | 1997-08-22 |
Publications (1)
Publication Number | Publication Date |
---|---|
WO1999010110A1 true WO1999010110A1 (en) | 1999-03-04 |
Family
ID=8099497
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/DK1998/000358 WO1999010110A1 (en) | 1997-08-22 | 1998-08-19 | Ultrasonic transducer |
Country Status (7)
Country | Link |
---|---|
CN (1) | CN1154545C (en) |
AU (1) | AU8798098A (en) |
DE (1) | DE19882623B4 (en) |
DK (1) | DK172871B1 (en) |
PL (1) | PL187955B1 (en) |
RU (1) | RU2185253C2 (en) |
WO (1) | WO1999010110A1 (en) |
Cited By (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP1143410A2 (en) * | 2000-04-06 | 2001-10-10 | Siemens Aktiengesellschaft | Sonic head |
EP2003430A3 (en) * | 2007-06-12 | 2010-08-04 | Mitsumi Electric Co., Ltd. | Method of manufacturing an ultrasonic sensor |
EP1345206A3 (en) * | 2002-03-12 | 2011-09-28 | Caldon, Inc. | A method for obtaining information about fluid in a pipe, and an element for placement in a pipe having means for holding an acoustic transducer |
WO2013097994A1 (en) * | 2011-12-29 | 2013-07-04 | Endress+Hauser Flowtec Ag | Ultrasonic transducer for a flow rate meter |
DE102012108254A1 (en) * | 2012-09-05 | 2014-03-06 | systec Controls Meß- und Regeltechnik GmbH | Ultrasonic transducer and method of making an ultrasonic transducer |
WO2018136044A1 (en) * | 2017-01-18 | 2018-07-26 | Siemens Aktiengesellschaft | Ultrasonic transducer and method of assembling the same |
EP3825015A1 (en) | 2019-11-22 | 2021-05-26 | Fraunhofer-Gesellschaft zur Förderung der angewandten Forschung e.V. | Ultrasonic unit for coupling ultrasonic waves into and from a medium |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN104359516A (en) * | 2014-11-07 | 2015-02-18 | 宁波美卓伦仪表有限公司 | Fully titanium alloy packaging ultrasonic-wave dual-use gas-liquid flow sensor |
Citations (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB1230156A (en) * | 1968-10-22 | 1971-04-28 | ||
US4148536A (en) * | 1976-11-22 | 1979-04-10 | Petropoulsos Nikolaostzakos J | Safety electrical receptacle |
GB2059715A (en) * | 1979-09-18 | 1981-04-23 | Standard Telephones Cables Ltd | Electro acoustic transducers |
DE3425176A1 (en) * | 1984-07-09 | 1986-02-20 | Fernsprech Und Signalbau Kg Sc | Piezoelectric telephone capsule |
US5222899A (en) * | 1992-05-08 | 1993-06-29 | Hughes Aircraft Company | Electrostatic discharge safety connector for electro-explosive devices |
DE4330745C1 (en) * | 1993-09-10 | 1995-04-27 | Siemens Ag | Ultrasonic transducer with adapter body |
Family Cites Families (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB690489A (en) * | 1950-02-06 | 1953-04-22 | John William Fox | Improvements in or relating to ultra-sonic equipment |
-
1997
- 1997-08-22 DK DK96597A patent/DK172871B1/en not_active IP Right Cessation
-
1998
- 1998-08-19 RU RU2000107143A patent/RU2185253C2/en not_active IP Right Cessation
- 1998-08-19 AU AU87980/98A patent/AU8798098A/en not_active Abandoned
- 1998-08-19 CN CNB988100797A patent/CN1154545C/en not_active Expired - Lifetime
- 1998-08-19 DE DE1998182623 patent/DE19882623B4/en not_active Expired - Lifetime
- 1998-08-19 WO PCT/DK1998/000358 patent/WO1999010110A1/en active Application Filing
- 1998-08-19 PL PL33873398A patent/PL187955B1/en not_active IP Right Cessation
Patent Citations (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB1230156A (en) * | 1968-10-22 | 1971-04-28 | ||
US4148536A (en) * | 1976-11-22 | 1979-04-10 | Petropoulsos Nikolaostzakos J | Safety electrical receptacle |
GB2059715A (en) * | 1979-09-18 | 1981-04-23 | Standard Telephones Cables Ltd | Electro acoustic transducers |
DE3425176A1 (en) * | 1984-07-09 | 1986-02-20 | Fernsprech Und Signalbau Kg Sc | Piezoelectric telephone capsule |
US5222899A (en) * | 1992-05-08 | 1993-06-29 | Hughes Aircraft Company | Electrostatic discharge safety connector for electro-explosive devices |
DE4330745C1 (en) * | 1993-09-10 | 1995-04-27 | Siemens Ag | Ultrasonic transducer with adapter body |
Cited By (11)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP1143410A2 (en) * | 2000-04-06 | 2001-10-10 | Siemens Aktiengesellschaft | Sonic head |
EP1143410A3 (en) * | 2000-04-06 | 2009-09-09 | Siemens Aktiengesellschaft | Sonic head |
EP1345206A3 (en) * | 2002-03-12 | 2011-09-28 | Caldon, Inc. | A method for obtaining information about fluid in a pipe, and an element for placement in a pipe having means for holding an acoustic transducer |
EP2003430A3 (en) * | 2007-06-12 | 2010-08-04 | Mitsumi Electric Co., Ltd. | Method of manufacturing an ultrasonic sensor |
WO2013097994A1 (en) * | 2011-12-29 | 2013-07-04 | Endress+Hauser Flowtec Ag | Ultrasonic transducer for a flow rate meter |
US9175994B2 (en) | 2011-12-29 | 2015-11-03 | Endress + Hauser Flowtec Ag | Ultrasonic transducer for a flow measuring device |
DE102012108254A1 (en) * | 2012-09-05 | 2014-03-06 | systec Controls Meß- und Regeltechnik GmbH | Ultrasonic transducer and method of making an ultrasonic transducer |
US10569303B2 (en) | 2012-09-05 | 2020-02-25 | Systec Controls Mess- ung Regeltechnik GmbH | Ultrasonic transducer, and method for producing an ultrasonic transducer |
WO2018136044A1 (en) * | 2017-01-18 | 2018-07-26 | Siemens Aktiengesellschaft | Ultrasonic transducer and method of assembling the same |
EP3825015A1 (en) | 2019-11-22 | 2021-05-26 | Fraunhofer-Gesellschaft zur Förderung der angewandten Forschung e.V. | Ultrasonic unit for coupling ultrasonic waves into and from a medium |
DE102019218033A1 (en) * | 2019-11-22 | 2021-05-27 | Fraunhofer-Gesellschaft zur Förderung der angewandten Forschung e.V. | Ultrasonic unit for coupling ultrasonic waves into and / or from a medium |
Also Published As
Publication number | Publication date |
---|---|
DK172871B1 (en) | 1999-08-23 |
DE19882623T1 (en) | 2000-08-10 |
DE19882623B4 (en) | 2004-10-21 |
CN1154545C (en) | 2004-06-23 |
PL187955B1 (en) | 2004-11-30 |
AU8798098A (en) | 1999-03-16 |
CN1275100A (en) | 2000-11-29 |
DK96597A (en) | 1999-02-23 |
RU2185253C2 (en) | 2002-07-20 |
PL338733A1 (en) | 2000-11-20 |
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