EP1493302B1 - Capteur de sons ou ultrasons - Google Patents

Capteur de sons ou ultrasons Download PDF

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Publication number
EP1493302B1
EP1493302B1 EP03724986A EP03724986A EP1493302B1 EP 1493302 B1 EP1493302 B1 EP 1493302B1 EP 03724986 A EP03724986 A EP 03724986A EP 03724986 A EP03724986 A EP 03724986A EP 1493302 B1 EP1493302 B1 EP 1493302B1
Authority
EP
European Patent Office
Prior art keywords
sound
matching layer
ultrasound
piezoelectric element
floor
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 - Lifetime
Application number
EP03724986A
Other languages
German (de)
English (en)
Other versions
EP1493302A1 (fr
Inventor
Rolf Deserno
Helmut Pfeiffer
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.)
Endress and Hauser SE and Co KG
Original Assignee
Endress and Hauser SE and Co KG
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 Endress and Hauser SE and Co KG filed Critical Endress and Hauser SE and Co KG
Publication of EP1493302A1 publication Critical patent/EP1493302A1/fr
Application granted granted Critical
Publication of EP1493302B1 publication Critical patent/EP1493302B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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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 ultrasonic sensor for transmitting and / or receiving sound or ultrasound.
  • Ultrasonic sensors are used e.g. used as transmitter and / or receiver for distance measurement according to the echosounding principle, in particular for measuring a filling level, e.g. in a container, or to measure a level, e.g. in a channel or on a conveyor belt.
  • An emitted by the sonic or ultrasonic sensor pulse is reflected at the surface of the filling.
  • the duration of the pulse from the sensor to the surface and back is determined and used to determine the fill level or fill level.
  • Such sonic or ultrasonic sensors are used in many industries, e.g. used in the food industry, the water and wastewater sector and in chemistry.
  • the sensors In almost all applications, it is necessary that the sensors have a radiation characteristic with a small opening angle of a main sound lobe and simultaneously low side 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 radiated sound lobe behaves as the quotient of the wavelength of the radiated sound or ultrasonic wave and the diameter of the front surface of the radiating element. In order to obtain a sound beam with a small opening angle, therefore, a large diameter is used.
  • the ring and the piezoelectric element thereby form a uniformly vibrating vibration structure.
  • the opening angle of the sound lobe is therefore here the larger outer diameter of the ring and not the diameter of the piezoelectric element.
  • sound and ultrasound pulses can be transmitted and received by the housing wall when the housing wall resonates with it. This can lead to false echoes.
  • the sound or ultrasound can also be transmitted as structure-borne noise to the housing and, moreover, to a holder of the sensor and possibly even to other components at the place of use. This can also lead to significant interference signals.
  • the matching layer has an annular peripheral groove on its outer edge on its side facing away from the bottom.
  • the groove has a depth at which a 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.
  • an effective diameter of the radiating surface which is relevant for determining the aperture angle of the radiation characteristic is almost equal to the diameter of the matching layer.
  • a bottom side of the matching layer has a waveform that corresponds to a Gaussian line over almost the entire diameter. Accordingly, the opening angle is small.
  • Fig. 1 shows a longitudinal section through a sound or ultrasonic 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 of Fig. 1 ,
  • the sonic or ultrasonic sensor has a cup-shaped housing 1, which is closed off by a bottom 3.
  • the housing 1 is made of a plastic, e.g. made of polypropylene.
  • a piezoelectric element 5 is arranged, which serves for the generation and / or recording of sound or ultrasound through the bottom 3 therethrough.
  • a matching layer 7 is arranged in front of the piezoelectric element 5 of a plastic having a mean acoustic impedance.
  • plastic e.g. an epoxy resin suitable.
  • the piezoelectric element 5 is disk-shaped.
  • the matching layer 7 is likewise disc-shaped and is located between the piezoelectric element 5 and the bottom 3 of the housing 1.
  • the matching layer 7 preferably has a thickness which corresponds to one quarter of the wavelength of the generated sound or ultrasound waves.
  • the matching layer 7 is surrounded by a metallic ring 9, which surrounds the matching layer 7 in a form-fitting manner.
  • the ring 9 consists e.g. made of brass. It stabilizes the matching layer 7 at its outer edge and causes vibrations of the matching layer 7 are virtually no longer transferred to the housing 1.
  • the fixed clamping of the matching layer 7 at its edge by the ring 9 prevents the matching layer 7 in an outer edge region from deforming.
  • the fitting layer 7 therefore preferably has an annular peripheral groove 11 at its outer edge on its side facing away from the ground.
  • An outer lateral boundary of the groove 11 can, as in Fig. 1 shown to be part of the matching layer 7.
  • the ring 9 may form the outer lateral boundary of the groove 11.
  • the groove 11 therefore preferably has a maximum depth at which a coupling to the housing 1 is low.
  • the matching layer 7 for example, a diameter of about 50 mm and the groove 11 has a width of for example about 5 mm.
  • An optimal depth of the groove 11 is approximately 5 mm in this embodiment.
  • a damping material 13 is therefore preferably provided in the housing 1.
  • the damping material 13 is e.g. a potting, 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)
  • Geophysics And Detection Of Objects (AREA)
  • Investigating Or Analyzing Materials By The Use Of Ultrasonic Waves (AREA)

Claims (4)

  1. Capteur sonique ou ultrasonique destiné à l'émission et/ou la réception de son ou d'ultrason
    - avec un boîtier (1) fermé en forme de pot par un fond (3),
    - un élément piézoélectrique (5) destiné à la génération et/ou la réception de son ou d'ultrason à travers le fond (3),
    - une couche d'adaptation (7) entre l'élément piézoélectrique (5) et le fond (3), et
    - une bague métallique (9), qui entoure de façon adéquate la couche d'adaptation (7).
  2. Capteur sonique ou ultrasonique selon la revendication 1, pour lequel la couche d'adaptation (7) présente sur son bord extérieur, sur son côté opposé au fond, une rainure (11) périphérique de forme annulaire.
  3. Capteur sonique ou ultrasonique selon la revendication 2, pour lequel la rainure (11) présente une profondeur (T), pour laquelle un couplage au boîtier (1) est faible.
  4. Capteur sonique ou ultrasonique selon la revendication 1, pour lequel un matériau d'amortissement (13) est prévu dans le boîtier (1).
EP03724986A 2002-04-11 2003-04-09 Capteur de sons ou ultrasons Expired - Lifetime EP1493302B1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE10216037A DE10216037A1 (de) 2002-04-11 2002-04-11 Schall-oder Ultraschallsensor
DE10216037 2002-04-11
PCT/EP2003/003682 WO2003086011A1 (fr) 2002-04-11 2003-04-09 Capteur de sons ou ultrasons

Publications (2)

Publication Number Publication Date
EP1493302A1 EP1493302A1 (fr) 2005-01-05
EP1493302B1 true EP1493302B1 (fr) 2009-01-21

Family

ID=28458729

Family Applications (1)

Application Number Title Priority Date Filing Date
EP03724986A Expired - Lifetime EP1493302B1 (fr) 2002-04-11 2003-04-09 Capteur de sons ou ultrasons

Country Status (7)

Country Link
US (1) US7190105B2 (fr)
EP (1) EP1493302B1 (fr)
AT (1) ATE421843T1 (fr)
AU (1) AU2003227585A1 (fr)
CA (1) CA2482141C (fr)
DE (2) DE10216037A1 (fr)
WO (1) WO2003086011A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102506929A (zh) * 2011-11-15 2012-06-20 上官明禹 一种耐高压气介超声波传感器及其制造方法

Families Citing this family (7)

* Cited by examiner, † Cited by third party
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
JP4656261B2 (ja) * 2008-12-04 2011-03-23 株式会社村田製作所 超音波送受波器
DE202013104569U1 (de) 2013-10-09 2013-11-25 Pepperl + Fuchs Gmbh Ultraschallsensor
EP3288291B1 (fr) * 2015-04-20 2021-05-26 Murata Manufacturing Co., Ltd. Capteur ultrasonore
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)

* Cited by examiner, † Cited by third party
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
WO1994005004A1 (fr) * 1992-08-13 1994-03-03 Siemens Aktiengesellschaft Transducteur ultrasonore
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
WO2000030554A1 (fr) * 1998-11-20 2000-06-02 Jones Joie P Procedes de dissolution et d'evacuation selectives de materiaux par ultrasons tres haute frequence

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102506929A (zh) * 2011-11-15 2012-06-20 上官明禹 一种耐高压气介超声波传感器及其制造方法
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

Also Published As

Publication number Publication date
DE50311120D1 (de) 2009-03-12
DE10216037A1 (de) 2003-10-23
WO2003086011A1 (fr) 2003-10-16
AU2003227585A1 (en) 2003-10-20
US7190105B2 (en) 2007-03-13
EP1493302A1 (fr) 2005-01-05
ATE421843T1 (de) 2009-02-15
CA2482141C (fr) 2009-06-23
US20060076854A1 (en) 2006-04-13
CA2482141A1 (fr) 2003-10-16

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