EP1493302A1 - Schall- oder ultraschallsensor - Google Patents
Schall- oder ultraschallsensorInfo
- Publication number
- EP1493302A1 EP1493302A1 EP03724986A EP03724986A EP1493302A1 EP 1493302 A1 EP1493302 A1 EP 1493302A1 EP 03724986 A EP03724986 A EP 03724986A EP 03724986 A EP03724986 A EP 03724986A EP 1493302 A1 EP1493302 A1 EP 1493302A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- sound
- ultrasound
- housing
- piezoelectric element
- matching layer
- 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.)
- Granted
Links
- 238000002604 ultrasonography Methods 0.000 title claims abstract description 23
- 230000006978 adaptation Effects 0.000 claims abstract description 10
- 238000013016 damping Methods 0.000 claims description 4
- 239000000463 material Substances 0.000 claims description 4
- 230000008878 coupling Effects 0.000 claims description 3
- 238000010168 coupling process Methods 0.000 claims description 3
- 238000005859 coupling reaction Methods 0.000 claims description 3
- 239000002184 metal Substances 0.000 abstract 1
- 230000005855 radiation Effects 0.000 description 7
- 230000005540 biological transmission Effects 0.000 description 4
- 230000010355 oscillation Effects 0.000 description 3
- 239000004033 plastic Substances 0.000 description 3
- 238000005452 bending Methods 0.000 description 2
- 229910001369 Brass Inorganic materials 0.000 description 1
- 239000004743 Polypropylene Substances 0.000 description 1
- 239000010951 brass Substances 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 238000002592 echocardiography Methods 0.000 description 1
- 239000003822 epoxy resin Substances 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 229920000647 polyepoxide Polymers 0.000 description 1
- -1 polypropylene Polymers 0.000 description 1
- 229920001155 polypropylene Polymers 0.000 description 1
- 229920001296 polysiloxane Polymers 0.000 description 1
- 238000004382 potting Methods 0.000 description 1
- 239000002351 wastewater Substances 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
- H04R17/00—Piezoelectric transducers; Electrostrictive transducers
Definitions
- the invention relates to a sound or ultrasound sensor for transmitting and / or receiving sound or ultrasound.
- Ultrasonic sensors are e.g. used as a transmitter and / or receiver for distance measurement according to the sounder principle, especially for measuring a level, e.g. in a container, or to measure a level, e.g. in a channel or on a conveyor belt.
- a pulse emitted by the sound or ultrasonic sensor is reflected on the surface of the product.
- the transit time of the pulse from the sensor to the surface and back is determined and from this the level or level is determined.
- Such sound or ultrasonic sensors are used in many branches of industry, e.g. used in the food industry, the water and wastewater industry and in chemistry.
- the sensors In almost all areas of application, it is necessary for the sensors to have a radiation characteristic with a small opening angle of a main sound lobe and at the same time low secondary sound lobes.
- the opening angle of the sensor is essentially determined by the diameter of the front surface and the frequency.
- the sine of the opening angle of the emitted sound beam behaves like the quotient of the wavelength of the emitted sound or ultrasound wave and the diameter of the front surface of the radiation element. In order to obtain a sound beam with a small opening angle, a large diameter must therefore be used.
- a piezoelectric element for generating and / or recording sound or ultrasound through the floor
- a metallic ring that engages around the piezoelectric element in a non-positive and positive manner.
- the ring and the piezoelectric element form a uniformly vibrating vibratory structure.
- the larger outside diameter of the ring and therefore not the diameter of the piezoelectric element is included here.
- the housing wall resonates, it can emit and receive sound or ultrasound pulses. This can lead to false echoes.
- the sound or ultrasound can also be transmitted as structure-borne sound to the housing and above it to a holder for the sensor and, if appropriate, even to other components at the place of use. This can also lead to significant interference signals.
- the invention consists in a sound or ultrasound sensor for transmitting and / or receiving sound or ultrasound
- a piezoelectric element for generating and / or recording sound or ultrasound through the floor
- the matching layer has an annular circumferential groove on its outer edge on its side facing away from the floor.
- the groove has a depth at which coupling to the housing is low.
- a damping material is provided in the housing.
- Advantages of the invention are that there is practically no transmission of sound or ultrasound to the housing. Corresponding interference signals therefore practically no longer occur.
- the groove ensures that an effective diameter of the radiating surface relevant for determining the opening angle of the radiation characteristic is almost equal to the diameter of the matching layer.
- a bottom side of the matching layer has an oscillation shape that corresponds to a Gaussian line over almost the entire diameter.
- the opening angle is correspondingly small. There is a well-directed radiation. The risk of stray signals and reflections, e.g. on the walls of containers in which the sensor is installed is therefore small.
- Fig. 1 shows a longitudinal section through a sound or ultrasonic sensor
- FIG. 2 shows a longitudinal section through the piezoelectric element and the matching layer from FIG. 1.
- 1 shows a longitudinal section through a sound or ultrasound sensor according to the invention for transmitting and / or receiving sound or ultrasound.
- FIG. 2 shows a longitudinal section through the piezoelectric element and the matching layer from FIG. 1.
- the sound or ultrasound sensor has a cup-shaped housing 1, which is closed off by a base 3.
- the housing 1 consists of a plastic, e.g. made of polypropylene.
- Housing 1 is a piezoelectric element 5, which is used to generate and / or record sound or ultrasound through floor 3.
- the acoustic impedance of the medium into which the sound or ultrasound is to be emitted, e.g. Air, and that of the piezoelectric element 5 is very different, is arranged in front of the piezoelectric element 5, a matching layer 7 made of a plastic with a medium acoustic impedance.
- the plastic is e.g. an epoxy resin.
- the piezoelectric element 5 is disk-shaped.
- the adaptation layer 7 is also disk-shaped and is located between the piezoelectric element 5 and the bottom 3 of the housing 1.
- the adaptation layer 7 preferably has a thickness that corresponds to a quarter of the wavelength of the generated sound or ultrasonic waves.
- the adaptation layer 7 is surrounded by a metallic ring 9 which surrounds the adaptation layer 7 in a form-fitting manner.
- the ring 9 is e.g. made of brass. It stabilizes the matching layer 7 on its outer edge and has the effect that vibrations of the matching layer 7 are practically no longer transmitted to the housing 1.
- the matching layer 7 therefore preferably has an annular circumferential groove 11 on its outer edge on its side facing away from the floor.
- An outer lateral boundary of the groove 11 can, as shown in FIG. 1, be part of the matching layer 7.
- the ring 9 can also form the outer lateral boundary of the groove 11.
- the groove 11 therefore preferably has a maximum depth at which it is coupled to the housing
- the matching layer 7 has a diameter of approximately 50 mm, for example, and the groove
- I I has a width of about 5 mm, for example.
- An optimal depth of the groove 11 in this embodiment is approximately 5 mm.
- a damping material 13 is therefore preferably provided in the housing 1.
- the damping material 13 is e.g. a potting compound, for example a silicone gel, which fills the housing 1.
Landscapes
- Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Acoustics & Sound (AREA)
- Signal Processing (AREA)
- Transducers For Ultrasonic Waves (AREA)
- Ultra Sonic Daignosis Equipment (AREA)
- Investigating Or Analyzing Materials By The Use Of Ultrasonic Waves (AREA)
- Geophysics And Detection Of Objects (AREA)
Abstract
Description
Claims
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE10216037 | 2002-04-11 | ||
DE10216037A DE10216037A1 (de) | 2002-04-11 | 2002-04-11 | Schall-oder Ultraschallsensor |
PCT/EP2003/003682 WO2003086011A1 (de) | 2002-04-11 | 2003-04-09 | Schall- oder ultraschallsensor |
Publications (2)
Publication Number | Publication Date |
---|---|
EP1493302A1 true EP1493302A1 (de) | 2005-01-05 |
EP1493302B1 EP1493302B1 (de) | 2009-01-21 |
Family
ID=28458729
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP03724986A Expired - Lifetime EP1493302B1 (de) | 2002-04-11 | 2003-04-09 | Schall- oder ultraschallsensor |
Country Status (7)
Country | Link |
---|---|
US (1) | US7190105B2 (de) |
EP (1) | EP1493302B1 (de) |
AT (1) | ATE421843T1 (de) |
AU (1) | AU2003227585A1 (de) |
CA (1) | CA2482141C (de) |
DE (2) | DE10216037A1 (de) |
WO (1) | WO2003086011A1 (de) |
Families Citing this family (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
ES2239500B1 (es) * | 2003-03-07 | 2006-12-01 | Consejo Sup. Investig. Cientificas | Dispositivo para la caracterizacion de materiales por ultrasonidos con acoplamiento por gases (aire) y su aplicacion para llevar a cabo un test no destructivo para verificar la integridad de membranas porosas. |
JP4618165B2 (ja) * | 2006-03-06 | 2011-01-26 | 株式会社デンソー | 超音波センサ |
DE102006062706B4 (de) * | 2006-03-30 | 2012-12-06 | Krohne Ag | Ultraschalldurchflußmeßgerät |
WO2010064712A1 (ja) * | 2008-12-04 | 2010-06-10 | 株式会社村田製作所 | 超音波送受波器 |
CN102506929B (zh) * | 2011-11-15 | 2015-06-10 | 上官明禹 | 一种耐高压气介超声波传感器及其制造方法 |
DE202013104569U1 (de) | 2013-10-09 | 2013-11-25 | Pepperl + Fuchs Gmbh | Ultraschallsensor |
WO2016171003A1 (ja) * | 2015-04-20 | 2016-10-27 | 株式会社村田製作所 | 超音波センサ |
JP7168849B2 (ja) | 2018-11-22 | 2022-11-10 | 日本電信電話株式会社 | 水中音響通信システム及び受信装置 |
Family Cites Families (12)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3950660A (en) * | 1972-11-08 | 1976-04-13 | Automation Industries, Inc. | Ultrasonic contact-type search unit |
US3921442A (en) * | 1973-11-28 | 1975-11-25 | Automation Ind Inc | Acoustic couplant for use with an ultrasonic search unit |
US4184094A (en) * | 1978-06-01 | 1980-01-15 | Advanced Diagnostic Research Corporation | Coupling for a focused ultrasonic transducer |
US4297607A (en) * | 1980-04-25 | 1981-10-27 | Panametrics, Inc. | Sealed, matched piezoelectric transducer |
DE3721209C2 (de) * | 1987-06-26 | 1997-04-30 | Grieshaber Vega Kg | Schall-/Ultraschallmeßgerät |
US5659220A (en) * | 1992-08-13 | 1997-08-19 | Siemens Aktiengesellschaft | Ultrasonic transducer |
DE4311963C2 (de) * | 1993-04-10 | 1996-10-24 | Endress Hauser Gmbh Co | Füllstandsmeßgerät |
DE4323134C1 (de) * | 1993-07-10 | 1994-06-16 | Pil Sensoren Gmbh | Ultraschallschwinger |
DE4330745C1 (de) | 1993-09-10 | 1995-04-27 | Siemens Ag | Ultraschallwandler mit Anpaßkörper |
DE59510158D1 (de) * | 1995-09-28 | 2002-05-16 | Endress Hauser Gmbh Co | Ultraschallwandler |
JP3879264B2 (ja) * | 1998-07-01 | 2007-02-07 | 株式会社村田製作所 | 超音波センサ |
AU1128600A (en) * | 1998-11-20 | 2000-06-13 | Joie P. Jones | Methods for selectively dissolving and removing materials using ultra-high frequency ultrasound |
-
2002
- 2002-04-11 DE DE10216037A patent/DE10216037A1/de not_active Withdrawn
-
2003
- 2003-04-09 AU AU2003227585A patent/AU2003227585A1/en not_active Abandoned
- 2003-04-09 WO PCT/EP2003/003682 patent/WO2003086011A1/de not_active Application Discontinuation
- 2003-04-09 EP EP03724986A patent/EP1493302B1/de not_active Expired - Lifetime
- 2003-04-09 DE DE50311120T patent/DE50311120D1/de not_active Expired - Lifetime
- 2003-04-09 AT AT03724986T patent/ATE421843T1/de not_active IP Right Cessation
- 2003-04-09 US US10/509,685 patent/US7190105B2/en not_active Expired - Fee Related
- 2003-04-09 CA CA002482141A patent/CA2482141C/en not_active Expired - Fee Related
Non-Patent Citations (1)
Title |
---|
See references of WO03086011A1 * |
Also Published As
Publication number | Publication date |
---|---|
US20060076854A1 (en) | 2006-04-13 |
US7190105B2 (en) | 2007-03-13 |
WO2003086011A1 (de) | 2003-10-16 |
DE10216037A1 (de) | 2003-10-23 |
CA2482141A1 (en) | 2003-10-16 |
ATE421843T1 (de) | 2009-02-15 |
EP1493302B1 (de) | 2009-01-21 |
DE50311120D1 (de) | 2009-03-12 |
AU2003227585A1 (en) | 2003-10-20 |
CA2482141C (en) | 2009-06-23 |
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