DE102012111957A1 - Device for material testing dental diagnostic unit with ultrasonic transducer element from piezo element for generation of ultrasound, has clearance for gas pad formed between rear side of transducer element and inner face of housing - Google Patents
Device for material testing dental diagnostic unit with ultrasonic transducer element from piezo element for generation of ultrasound, has clearance for gas pad formed between rear side of transducer element and inner face of housing Download PDFInfo
- Publication number
- DE102012111957A1 DE102012111957A1 DE201210111957 DE102012111957A DE102012111957A1 DE 102012111957 A1 DE102012111957 A1 DE 102012111957A1 DE 201210111957 DE201210111957 DE 201210111957 DE 102012111957 A DE102012111957 A DE 102012111957A DE 102012111957 A1 DE102012111957 A1 DE 102012111957A1
- Authority
- DE
- Germany
- Prior art keywords
- transducer element
- ultrasonic transducer
- housing
- ultrasound
- material testing
- 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.)
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Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N29/00—Investigating or analysing materials by the use of ultrasonic, sonic or infrasonic waves; Visualisation of the interior of objects by transmitting ultrasonic or sonic waves through the object
- G01N29/22—Details, e.g. general constructional or apparatus details
- G01N29/28—Details, e.g. general constructional or apparatus details providing acoustic coupling, e.g. water
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B8/00—Diagnosis using ultrasonic, sonic or infrasonic waves
- A61B8/08—Detecting organic movements or changes, e.g. tumours, cysts, swellings
- A61B8/0875—Detecting organic movements or changes, e.g. tumours, cysts, swellings for diagnosis of bone
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B8/00—Diagnosis using ultrasonic, sonic or infrasonic waves
- A61B8/12—Diagnosis using ultrasonic, sonic or infrasonic waves in body cavities or body tracts, e.g. by using catheters
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B8/00—Diagnosis using ultrasonic, sonic or infrasonic waves
- A61B8/44—Constructional features of the ultrasonic, sonic or infrasonic diagnostic device
- A61B8/4444—Constructional features of the ultrasonic, sonic or infrasonic diagnostic device related to the probe
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61C—DENTISTRY; APPARATUS OR METHODS FOR ORAL OR DENTAL HYGIENE
- A61C19/00—Dental auxiliary appliances
- A61C19/04—Measuring instruments specially adapted for dentistry
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N29/00—Investigating or analysing materials by the use of ultrasonic, sonic or infrasonic waves; Visualisation of the interior of objects by transmitting ultrasonic or sonic waves through the object
- G01N29/22—Details, e.g. general constructional or apparatus details
- G01N29/32—Arrangements for suppressing undesired influences, e.g. temperature or pressure variations, compensating for signal noise
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B8/00—Diagnosis using ultrasonic, sonic or infrasonic waves
- A61B8/42—Details of probe positioning or probe attachment to the patient
- A61B8/4272—Details of probe positioning or probe attachment to the patient involving the acoustic interface between the transducer and the tissue
- A61B8/4281—Details of probe positioning or probe attachment to the patient involving the acoustic interface between the transducer and the tissue characterised by sound-transmitting media or devices for coupling the transducer to the tissue
Abstract
Description
Die Erfindung bezieht sich auf eine Vorrichtung zur Materialprüfung mit mindestens einem innerhalb eines Gehäuses angeordneten Ultraschallwandlerelement aus einem Piezoelement zur Erzeugung des Ultraschalls.The invention relates to a device for material testing with at least one arranged within a housing ultrasonic transducer element of a piezoelectric element for generating the ultrasound.
Die Erfindung findet insbesondere Anwendung als zahnmedizinisches Diagnosegerät, wobei das grundlegende Problem der Strahlenbelastung bei der zahnärztlichen Röntgendiagnostik vermieden ist. Es wird hierzu auf die
Weitere bekannte Anordnungen bzw. Vorrichtungen von Ultraschallwandlerelementen benötigen mindestens eine schallabsorbierende Schicht auf der dem Probekörper, z.B. einem Zahn, abgewandten Seite, d. h. auf der Rückseite des Ultraschallwandlerelementes. Die schallabsorbierende Schicht benötigt erstens eine gewisse Dicke, die konstruktiv vorgesehen sein muss, und zweitens absorbiert diese Schicht das Schallsignal nicht vollständig, so dass ein Restsignal auf das Ultraschallwandlerelement zurückkehrt und dort die Detektion von Nutzsignalen durch Überlagerung stört. Other known arrangements or devices of ultrasonic transducer elements require at least one sound-absorbing layer on the specimen, e.g. a tooth, opposite side, d. H. on the back of the ultrasonic transducer element. Firstly, the sound-absorbing layer needs a certain thickness, which must be structurally provided, and secondly, this layer does not completely absorb the sound signal, so that a residual signal returns to the ultrasound transducer element where it disturbs the detection of useful signals by superposition.
Der Erfindung liegt von daher die Aufgabe zugrunde, eine Vorrichtung der gattungsgemäßen Art zur Materialprüfung mittels Ultraschall zu schaffen, bei der diese Nachteile vermieden sind.The invention is therefore an object of the invention to provide a device of the generic type for material testing by means of ultrasound, in which these disadvantages are avoided.
Zur Lösung dieser Aufgabe sieht die Erfindung vor, dass zwischen der Rückseite des Ultraschallwandlerelementes und der dieser zugeordneten Innenseite des Gehäuses ein Freiraum für ein Gaspolster ausgebildet ist. Erfindungsgemäß wird durch die Verwendung eines Gaspolsters auf der Rückseite des Ultraschallwandlerelementes erreicht, dass die Vorrichtung eine geringere Dicke als bekannte Ultraschallwandlerelemente aufweist und die Nutzsignale nicht durch parasitäre Signale von der Rückseite des Ultraschallwandlerelementes gestört werden.To achieve this object, the invention provides that between the rear side of the ultrasonic transducer element and the associated inner side of the housing, a free space for a gas cushion is formed. According to the invention is achieved by the use of a gas cushion on the back of the ultrasonic transducer element that the device has a smaller thickness than known ultrasonic transducer elements and the useful signals are not disturbed by parasitic signals from the back of the ultrasonic transducer element.
Ein besonderer Vorteil der Erfindung besteht im Verzicht auf eine Schallabsorption an der Rückseite des Ultraschallwandlerelementes. Durch die Nutzung der Reflexion an der Grenzfläche des Ultraschallwandlerelementes und des Gaspolsters verbleibt mehr Energie in der Vorrichtung.A particular advantage of the invention is the absence of sound absorption at the back of the ultrasonic transducer element. By using the reflection at the interface of the ultrasonic transducer element and the gas cushion, more energy remains in the device.
Aufgrund der Erfindung können dünnere Ultraschallwandlerelemente aufgebaut werden, die eine Verwendung in engen Räumen, z. B. der Mundhöhle, ermöglichen. Ferner wird das Empfangssignal nicht durch parasitäre Signale beeinträchtigt, die von der Rückseite des Ultraschallwandlerelementes ausgehen.Due to the invention thinner ultrasonic transducer elements can be constructed, which can be used in confined spaces, eg. As the oral cavity, allow. Furthermore, the received signal is not affected by parasitic signals emanating from the back of the ultrasonic transducer element.
Das Gaspolster kann in einer Ausbildung der Erfindung eine Gasschicht sein, wobei „Gas“ einzelne Gase oder Gasmischungen umfasst. Vorzugsweise ist die Gasschicht eine Luftschicht. The gas cushion may in one embodiment of the invention be a gas layer, where "gas" comprises individual gases or gas mixtures. Preferably, the gas layer is an air layer.
In weiterer Ausbildung der Erfindung ist vorgesehen, dass das Gaspolster zwischen der Rückseite des Ultraschallwandlerelementes und der dieser zugeordneten Innenseite des Gehäuses ein offenzelliges Hart- oder Weichschaumelement mit sehr niedriger akustischer Impedanz ist [Wertebereich: 400 Ns/m3–10e6 Ns/m3, bevorzugt: 400 Ns/m3–1.5e6 Ns/m3, besonders bevorzugt: 400 Ns/m3–1 Ns/m3]. Das offenzellige Hart- oder Weichschaumelement ist porös und weist in seinem Innenraum Gas- bzw. Lufteinschlüsse auf. Diese Ausbildung der Erfindung wird eingesetzt, wenn das Ultraschallwandlerelement nicht selbsttragend ist, so dass alternativ der Hartschaum mit sehr niedriger akustischer Impedanz verwendet wird. In a further embodiment of the invention, it is provided that the gas cushion between the rear side of the ultrasonic transducer element and the inner side of the housing associated therewith is an open-cell hard or soft foam element with very low acoustic impedance [value range: 400 Ns / m 3 -10e 6 Ns / m 3 , preferably: 400 Ns / m 3 -1.5e 6 Ns / m 3 , particularly preferred: 400 Ns / m 3 -1 Ns / m 3 ]. The open-cell hard or soft foam element is porous and has gas or air pockets in its interior. This embodiment of the invention is used when the ultrasonic transducer element is not self-supporting, so that alternatively the hard foam with a very low acoustic impedance is used.
Das Gehäuse des Ultraschallwandlerelementes ist in einer Ausführungsform im Querschnitt U-förmig. Die jeweiligen Piezoelemente werden von zwei Elektroden umkontaktiert.The housing of the ultrasonic transducer element is in one embodiment in cross-section U-shaped. The respective piezo elements are contacted by two electrodes.
Weitere vorteilhafte Ausgestaltungen der Erfindung ergeben sich dadurch, dass der Frequenzbereich des Ultraschallwandlerelementes zwischen 500 kHz und 1 GHz, insbesondere zwischen 2 MHz und 100 MHz liegt, dass auf der Vorderseite des Ultraschallwandlerelementes innerhalb des Gehäuses eine parallel zur Innenseite des Gehäuses aufgespannte flexible Platinenfolie, auf welcher sich das Ultraschallwandlerelement/Piezoelement befindet, angeordnet ist und dass die flexible Platinenfolie den Freiraum für das Gaspolster (die Gas-/Luftschicht bzw. das Hartschaumelement) von einem Gehäuseraum für ein Fluid, inbesondere für ein Koppelgel, trennt. Ferner dient die Platinenfolie als Anpassschicht für die Übertragung des Ultraschalls vom Piezoelement auf das Koppelmedium bzw. den Prüfkörper.Further advantageous embodiments of the invention result from the fact that the frequency range of the ultrasonic transducer element between 500 kHz and 1 GHz, in particular between 2 MHz and 100 MHz is that on the front of the ultrasonic transducer element within the housing a parallel to the inside of the housing clamped flexible blank foil on which is the ultrasonic transducer element / piezoelectric element is located, and that the flexible board foil the space for the gas cushion (the gas / air layer or the rigid foam element) from a housing space for a fluid, in particular for a coupling gel separates. Furthermore, the sinker foil serves as a matching layer for the transmission of the ultrasound from the piezoelement to the coupling medium or the test body.
Die Erfindung wird nachfolgend anhand von zwei in den Zeichnungen dargestellten Ausführungsformen einer Vorrichtung zur Materialprüfung mit mindestens einem Ultraschallwandlerelement näher erläutert.The invention will be explained in more detail below with reference to two embodiments of a device for material testing with at least one ultrasonic transducer element shown in the drawings.
Es zeigt:It shows:
Die in
Das Piezoelement
Das Ultraschallwandlerelement
Die in
Erfindungsgemäß wird durch die Verwendung eines Gaspolsters auf der Rückseite des Ultraschallwandlerelementes erreicht, dass die Vorrichtung eine geringere Dicke als bekannte Ultraschallwandlerelemente aufweist und die Nutzsignale nicht durch parasitäre Signale von der Rückseite des Ultraschallwandlerelementes gestört werden.According to the invention is achieved by the use of a gas cushion on the back of the ultrasonic transducer element that the device has a smaller thickness than known ultrasonic transducer elements and the useful signals are not disturbed by parasitic signals from the back of the ultrasonic transducer element.
BezugszeichenlisteLIST OF REFERENCE NUMBERS
- 11
- Gehäuse casing
- 22
- Rückwand rear wall
- 3, 43, 4
- Seitenwand Side wall
- 55
- Ultraschallwandlerelement Ultrasonic transducer element
- 66
- Piezoelement piezo element
- 77
-
Rückseite von
5 Back of5 - 88th
-
Innenseite von
2 Inside of2 - 99
- Freiraum free space
- 10 10
- Gaspolstergas cushion
- 10a10a
- Hartschaumelement Rigid foam element
- 10b10b
- Gas-, vorzugsweise Luftschicht Gas, preferably air layer
- 1111
-
Vorderseite von
5 Front of5 - 1212
- Platinenfolie platinum foil
- 1313
- Gehäuseraum housing space
- 1414
- Fluid (Koppelgel) Fluid (coupling gel)
- 1515
- zahnmedizinisches Diagnosegerät dental diagnostic device
- 1616
- Zahn tooth
- 17, 1817, 18
- Elektrode electrode
ZITATE ENTHALTEN IN DER BESCHREIBUNG QUOTES INCLUDE IN THE DESCRIPTION
Diese Liste der vom Anmelder aufgeführten Dokumente wurde automatisiert erzeugt und ist ausschließlich zur besseren Information des Lesers aufgenommen. Die Liste ist nicht Bestandteil der deutschen Patent- bzw. Gebrauchsmusteranmeldung. Das DPMA übernimmt keinerlei Haftung für etwaige Fehler oder Auslassungen.This list of the documents listed by the applicant has been generated automatically and is included solely for the better information of the reader. The list is not part of the German patent or utility model application. The DPMA assumes no liability for any errors or omissions.
Zitierte PatentliteraturCited patent literature
- DE 102010040832 B4 [0002] DE 102010040832 B4 [0002]
Claims (6)
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE201210111957 DE102012111957A1 (en) | 2012-12-07 | 2012-12-07 | Device for material testing dental diagnostic unit with ultrasonic transducer element from piezo element for generation of ultrasound, has clearance for gas pad formed between rear side of transducer element and inner face of housing |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE201210111957 DE102012111957A1 (en) | 2012-12-07 | 2012-12-07 | Device for material testing dental diagnostic unit with ultrasonic transducer element from piezo element for generation of ultrasound, has clearance for gas pad formed between rear side of transducer element and inner face of housing |
Publications (1)
Publication Number | Publication Date |
---|---|
DE102012111957A1 true DE102012111957A1 (en) | 2014-06-12 |
Family
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DE201210111957 Withdrawn DE102012111957A1 (en) | 2012-12-07 | 2012-12-07 | Device for material testing dental diagnostic unit with ultrasonic transducer element from piezo element for generation of ultrasound, has clearance for gas pad formed between rear side of transducer element and inner face of housing |
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DE (1) | DE102012111957A1 (en) |
Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4190783A (en) * | 1978-07-25 | 1980-02-26 | The Stoneleigh Trust, Fred M. Dellorfano, Jr. & Donald P. Massa, Trustees | Electroacoustic transducers of the bi-laminar flexural vibrating type with an acoustic delay line |
DE3301848A1 (en) * | 1983-01-20 | 1984-07-26 | Siemens AG, 1000 Berlin und 8000 München | ULTRASONIC CONVERTER |
DE102008028200A1 (en) * | 2008-06-12 | 2009-12-17 | Forschungszentrum Karlsruhe Gmbh | Ultrasonic transducer for use during e.g. weld testing, has transducer element with electrodes, where lever arms, force, reinforcing element, strip and layers produce and/or change bend or curvature on carrier plate in region of element |
DE102010040274A1 (en) * | 2010-09-06 | 2012-03-08 | Intelligendt Systems & Services Gmbh | Device for internal inspection of a workpiece having a hollow cylindrical bore |
DE102010040832B4 (en) | 2010-09-15 | 2012-09-13 | S&N Systemhaus für Netzwerk- und Datentechnik GmbH | Dental diagnostic device |
-
2012
- 2012-12-07 DE DE201210111957 patent/DE102012111957A1/en not_active Withdrawn
Patent Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4190783A (en) * | 1978-07-25 | 1980-02-26 | The Stoneleigh Trust, Fred M. Dellorfano, Jr. & Donald P. Massa, Trustees | Electroacoustic transducers of the bi-laminar flexural vibrating type with an acoustic delay line |
DE3301848A1 (en) * | 1983-01-20 | 1984-07-26 | Siemens AG, 1000 Berlin und 8000 München | ULTRASONIC CONVERTER |
DE102008028200A1 (en) * | 2008-06-12 | 2009-12-17 | Forschungszentrum Karlsruhe Gmbh | Ultrasonic transducer for use during e.g. weld testing, has transducer element with electrodes, where lever arms, force, reinforcing element, strip and layers produce and/or change bend or curvature on carrier plate in region of element |
DE102010040274A1 (en) * | 2010-09-06 | 2012-03-08 | Intelligendt Systems & Services Gmbh | Device for internal inspection of a workpiece having a hollow cylindrical bore |
DE102010040832B4 (en) | 2010-09-15 | 2012-09-13 | S&N Systemhaus für Netzwerk- und Datentechnik GmbH | Dental diagnostic device |
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