EP1515303A1 - Ultrasound transducer assembly including a mass ring for the damping of interfering resonances - Google Patents
Ultrasound transducer assembly including a mass ring for the damping of interfering resonances Download PDFInfo
- Publication number
- EP1515303A1 EP1515303A1 EP04017189A EP04017189A EP1515303A1 EP 1515303 A1 EP1515303 A1 EP 1515303A1 EP 04017189 A EP04017189 A EP 04017189A EP 04017189 A EP04017189 A EP 04017189A EP 1515303 A1 EP1515303 A1 EP 1515303A1
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- Prior art keywords
- housing
- membrane
- mass ring
- ring
- ultrasonic transducer
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- 238000013016 damping Methods 0.000 title claims description 13
- 238000002604 ultrasonography Methods 0.000 title claims description 9
- 230000002452 interceptive effect Effects 0.000 title description 2
- 239000012528 membrane Substances 0.000 claims abstract description 24
- 239000013013 elastic material Substances 0.000 claims description 3
- 239000000463 material Substances 0.000 claims description 3
- 239000007789 gas Substances 0.000 description 7
- 238000004519 manufacturing process Methods 0.000 description 3
- 238000005259 measurement Methods 0.000 description 3
- 230000003071 parasitic effect Effects 0.000 description 3
- 230000000694 effects Effects 0.000 description 2
- 239000012530 fluid Substances 0.000 description 2
- 238000009434 installation Methods 0.000 description 2
- 238000012545 processing Methods 0.000 description 2
- -1 For example Substances 0.000 description 1
- 108010076504 Protein Sorting Signals Proteins 0.000 description 1
- 238000009825 accumulation Methods 0.000 description 1
- 238000005452 bending Methods 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 238000005266 casting Methods 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 238000012937 correction Methods 0.000 description 1
- 230000001419 dependent effect Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 231100001261 hazardous Toxicity 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 238000011144 upstream manufacturing Methods 0.000 description 1
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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
- G10K11/002—Devices for damping, suppressing, obstructing or conducting sound in acoustic devices
-
- 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
- G10K9/00—Devices in which sound is produced by vibrating a diaphragm or analogous element, e.g. fog horns, vehicle hooters or buzzers
- G10K9/12—Devices in which sound is produced by vibrating a diaphragm or analogous element, e.g. fog horns, vehicle hooters or buzzers electrically operated
- G10K9/122—Devices in which sound is produced by vibrating a diaphragm or analogous element, e.g. fog horns, vehicle hooters or buzzers electrically operated using piezoelectric driving means
Definitions
- the invention relates to an ultrasonic transducer according to the preamble of Claim 1.
- ultrasonic transducer From DE 100 40 344 A1, such an ultrasonic transducer is known, the Generation and detection of ultrasonic signals is used and the one mutual conversion of electrical vibrations into acoustic Vibrations allowed.
- These ultrasonic transducers are used for example in Gas flow meters used.
- Each arranged in pairs Ultrasonic transducers define a measurement path that is non-perpendicular Angle to the longitudinal axis is.
- the measuring principle consists in a determination of a Transit time difference of two ultrasonic signals, which is once a component in Flow direction and once a component against the flow direction exhibit. From the measured transit time difference can be under consideration calculate the flow velocity of the geometry.
- the adapter flanges are either welded or integral of the meter body, if this is manufactured in casting technology. Because the ultrasonic transducers 16 and 18 installed at a certain angle (usually 45 °) Be always creates a cavity 28, which represents a flow disturbance. This disorder exists regardless of how deep the ultrasound transducer, in the middle, withdrawn or immersed, is inserted. The disorders are among others the larger the larger the sensor diameter and the associated Size of the sensor pocket is in relation to the diameter of the measuring cell. Which forming vortices are not fully calculated analytically and are of upstream of the flowmeter possibly existing Vorinen the flow and the flow rate (Reynolds number) dependent. The result resulting errors are determined in practice by calibration and in shape stored a mostly non-linear correction function. Because in the calibration always only a certain Reynolds number range and a concrete installation situation can be covered, a residual error arises in the event of variation of these conditions, which always occur in practice.
- the ultrasonic transducers are used in multipath arrangements, to detect asymmetries in the flow.
- the achievable number of paths is determined by the available mounting space, limited by the transducer size, certainly.
- the resulting cavity is a danger of accumulation of deposits given, which can affect the measurement accuracy, the Deposits are larger the larger the cavity is.
- the previously realized transducer dimensions thus limit the achievable Accuracy due to excessive flow or leave no multi-path arrangement from sensors because of the limited mounting space too.
- the size of the Sensors also not insignificantly requires the overall design for a complete Counter and brings additional problems for example in the pressure resistance, the cost of materials, the weight and affects the whole Production costs. Handling during production, transport, installation, maintenance, Repair is difficult.
- an ultrasonic transducer which is a piezoelectric Element having, via a spring to an ultrasonic radiating Membrane is pressed.
- the membrane On the edge, the membrane has one with the membrane integrally formed, reinforced, i. a higher mass edge on, which is thus ring-shaped and serves, due to its mass to dampen interfering frequencies.
- the edge is in its longitudinal extension kept as short as possible and is at the height of the piezoelectric element arranged.
- the ultrasonic transducer according to the invention has a housing in a known manner, at least one piezoelectric element and one emitting the ultrasound or receiving membrane on the edge of a mass ring is angeordent. According to the invention, it is further provided that the ultrasonic transducer after the Longitudinal oscillator type is formed, that the mass ring separately from the membrane is and is connected on the inside edge with this and with the housing and that the housing has on the inside a damping element which is annular is formed and arranged adjacent to the ground ring.
- the mass ring is screwed to the membrane, so that the mass ring and the membrane in a defined position to each other and firmly connected to each other. The same applies to the connection of the mass ring with the housing.
- the ultrasonic transducers in flow meters for aggressive and hazardous and high pressure and temperature media used, so that advantageously the membrane and the housing at the level of Masseringes are welded together. This is an absolute tightness of the Given converter.
- the Damping element made of an elastic material, preferably one rubbery material.
- the separate mass ring may also be formed integrally with the housing.
- the term "separate" should merely indicate that the mass ring is separate from the membrane, because that is an essential feature of the invention that the advantageous Damping causes significant.
- a measuring arrangement 10 is shown, the measuring principle, for example an ultrasonic gas flow meter illustrates.
- a pipe 12 flows a gas in the flow direction 14.
- Ultrasonic transducers 16 and 18 are arranged, which define a measuring path 20.
- the Ultrasonic transducers 16, 18 are suitable electrical signals in ultrasound to convert and vice versa, to send and receive ultrasound.
- Of the Measuring path 20 is at an angle not equal to 90 ° to a longitudinal axis 22 of the Pipeline 12 is arranged so that the in the opposite direction along the Measuring path 20 sent ultrasonic signals due to the gas flow 14 a Have runtime difference. From the maturity difference and the corresponding Geometry allows the flow velocity and thus the Determine the volume flow of the gas.
- the ultrasonic transducer 16 (FIG. 1) has an ultrasound generating element 30 on, which can consist of two piezoceramics 32, 34, which with an electric Line 36 are connected.
- the electrical line 36 is electrically insulating guided.
- the piezoelectric element 30 is between two cylindrical Clamping sections 40 and 42 clamped.
- the two clamping sections 40 and 42 are connected to each other via a clamping member 44, so that the piezoelectric Element 30 is held clamped between the clamping sections.
- the free Front side 46 of the clamping section 42 serves as a transmitting and / or receiving surface, over which the ultrasonic signals are emitted or received.
- the end face 46 is designed as a bending plate 48 and is referred to below as a membrane 48.
- Ultrasound signals oscillate the diaphragm 48 according to the of the generated piezoelectric element 30 and the rigid clamping section 42nd transmitted ultrasonic vibrations and thus emits the ultrasonic signals.
- the signal sequence is reversed and the Membrane 48 absorbs the ultrasonic vibrations that occur over the tensioning section 42 are passed to the piezoelectric element 30, the vibrations in converts electrical signals.
- the membrane 48 has an angled edge 50, to which a housing 52, which is the aforementioned signal-conducting and signal-processing components surrounds.
- the housing 52 is formed substantially cylindrical.
- the edge 50 of the membrane 48 On its inside is the edge 50 of the membrane 48 with a ground ring 54 connected, preferably screwed.
- the Massering is only marginally with the Connected membrane 48, so only in the region of the edge 50, so that the membrane 48th has the largest possible area for swinging.
- the inside is arranged mass ring 54 spaced from the membrane 48 via a gap L.
- the mass ring 54 screwed into the edge 50 protrudes beyond the edge 50, such that the mass ring 54 can also be connected to the housing 52, in particular is screwed. Since the housing in a suitable and not shown Way, e.g. via an end 58 remote from the diaphragm 48 arranged flange, in which flow meter can be fixed, are above the Massering 54 also the signal-conducting and signal-processing components held.
- the housing 52 with the edge 50 welded.
- the housing 52 on the inside a damping element 64 which consists of an elastic material, For example, rubber, may exist.
- the damping element is annular formed so that it come to rest on the inside of the housing 52 can and is advantageously arranged adjacent to the mass ring 54.
- the mass ring 54 can also be integrally formed with the housing 52.
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- Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Acoustics & Sound (AREA)
- Multimedia (AREA)
- Measuring Volume Flow (AREA)
- Transducers For Ultrasonic Waves (AREA)
- Measurement Of Velocity Or Position Using Acoustic Or Ultrasonic Waves (AREA)
- Apparatuses For Generation Of Mechanical Vibrations (AREA)
Abstract
Description
Die Erfindung betrifft einen Ultraschallwandler gemäß dem Oberbegriff des Anspruchs 1.The invention relates to an ultrasonic transducer according to the preamble of Claim 1.
Aus der DE 100 40 344 A1 ist ein derartiger Ultraschallwandler bekannt, der zur Erzeugung und Detektion von Ultraschallsignalen eingesetzt wird und der eine wechselseitige Umwandlung von elektrischen Schwingungen in akustische Schwingungen erlaubt. Diese Ultraschallwandler werden beispielsweise in Gasdurchflusszählern eingesetzt. Jeweils paarweise angeordnete Ultraschallwandler definieren einen Messpfad, der in einem nicht senkrechten Winkel zur Längsachse liegt. Das Messprinzip besteht in einer Bestimmung einer Laufzeitdifferenz zweier Ultraschallsignale, die einmal eine Komponente in Strömungsrichtung und einmal eine Komponente entgegen der Strömungsrichtung aufweisen. Aus der gemessenen Laufzeitdifferenz lässt sich unter Berücksichtigung der Geometrie die Strömungsgeschwindigkeit berechnen.From DE 100 40 344 A1, such an ultrasonic transducer is known, the Generation and detection of ultrasonic signals is used and the one mutual conversion of electrical vibrations into acoustic Vibrations allowed. These ultrasonic transducers are used for example in Gas flow meters used. Each arranged in pairs Ultrasonic transducers define a measurement path that is non-perpendicular Angle to the longitudinal axis is. The measuring principle consists in a determination of a Transit time difference of two ultrasonic signals, which is once a component in Flow direction and once a component against the flow direction exhibit. From the measured transit time difference can be under consideration calculate the flow velocity of the geometry.
Den prinzipiellen Aufbau eines solchen Durchflussmessers zeigt Fig. 2. Die die
Ultraschallsignale erzeugenden und messenden Ultraschallwandler 16 und 18 sind
mittels spezieller an das Leitungsrohr 12 angebrachter Adapterflansche 24 und 26,
sogenannter Wandlertaschen, in das Rohr 12 bzw. die Rohrwandung eingesteckt. The basic structure of such a flow meter Fig. 2. Die
Ultrasonic signal generating and measuring
Die Adapterflansche werden entweder eingeschweißt oder sind integraler Bestandteil
des Zählerkörpers, wenn dieser in Gusstechnologie gefertigt wird. Da die Ultraschallwandler
16 und 18 unter einem bestimmten Winkel (üblicherweise 45°) eingebaut
werden, entsteht immer eine Kavität 28, die eine Strömungsstörung darstellt.
Diese Störung existiert unabhängig davon, wie tief der Ultraschallwandler, mittig,
zurückgezogen oder eintauchend, eingesteckt ist. Die Störungen sind unter anderem
um so größer je größer der Sensordurchmesser und damit verbunden die
Größe der Sensortasche im Verhältnis zum Durchmesser der Messzelle ist. Die sich
ausbildenden Wirbel sind nicht vollständig analytisch zu berechnen und sind von
stromaufwärts des Durchflussmessers evtl. vorhandenen Vorstörungen der Strömung
und der Strömungsgeschwindigkeit (Reynoldszahl) abhängig. Die dadurch
entstehenden Fehler werden in der Praxis durch Kalibrierung ermittelt und in Form
einer zumeist nichtlinearen Korrekturfunktion hinterlegt. Da bei der Kalibrierung
immer nur ein bestimmter Reynoldszahlbereich und eine konkrete Einbausituation
abgedeckt werden können, entsteht ein Restfehler bei Variation dieser Bedingungen,
die in der Praxis immer vorkommen.The adapter flanges are either welded or integral
of the meter body, if this is manufactured in casting technology. Because the
Weiter werden in der Praxis die Ultraschallwandler in Mehrpfadanordnungen verwendet, um Unsymmetrien in der Strömung zu erfassen. Die realisierbare Pfadanzahl wird durch den verfügbaren Anbauraum, begrenzt durch die Wandlergröße, bestimmt. Um die Genauigkeit der Strömungsmessung zu erhöhen ist es daher von Vorteil, insbesondere die Wandlerabmessungen so klein wie möglich zu halten.Furthermore, in practice, the ultrasonic transducers are used in multipath arrangements, to detect asymmetries in the flow. The achievable number of paths is determined by the available mounting space, limited by the transducer size, certainly. In order to increase the accuracy of the flow measurement, it is therefore of Advantage, in particular to keep the transducer dimensions as small as possible.
Weiter ist durch die entstehende Kavität eine Gefahr der Ansammlung von Ablagerungen gegeben, welche die Messgenauigkeit beeinflussen können, wobei die Ablagerungen größer sind je größer die Kavität ist.Further, the resulting cavity is a danger of accumulation of deposits given, which can affect the measurement accuracy, the Deposits are larger the larger the cavity is.
Zwar ist es demnach wünschenswert möglichst kleine Wandler einzusetzen, jedoch stehen einer zunehmenden Miniaturisierung funktionelle, z. B. das Übertragungsverhalten und technologische Grenzen, z. B. die Machbarkeit und Effizienz der Fertigung, gegenüber. Vorzugsweise sind bei Ultraschallwandlern für Anwendungen in Gasen wegen der relativ niedrigen Arbeitsfrequenzen vergleichsweise große Sensoren im Verhältnis zur Gaszählergröße üblich. Although it is therefore desirable to use the smallest possible converter, however are an increasing miniaturization functional, z. B. the transmission behavior and technological limits, eg. B. the feasibility and efficiency of manufacturing, across from. Preferably, in ultrasonic transducers for applications in Gases because of the relatively low operating frequencies comparatively large sensors in relation to the gas meter size usual.
Die bisher realisierten Wandlerabmessungen begrenzen somit die erreichbare Genauigkeit durch zu stark gestörte Strömung bzw. lassen keine Mehrpfadanordnung von Sensoren wegen des beschränkten Anbauraumes zu. Die Größe der Sensoren bedingt auch nicht unerheblich die Gesamtkonstruktion für einen kompletten Zähler und bringt zusätzliche Probleme beispielsweise bei der Druckfestigkeit, dem Materialaufwand, dem Gewicht und hat Auswirkungen auf die gesamten Herstellkosten. Auch die Handhabung bei Fertigung, Transport, Einbau, Wartung, Reparatur wird erschwert.The previously realized transducer dimensions thus limit the achievable Accuracy due to excessive flow or leave no multi-path arrangement from sensors because of the limited mounting space too. The size of the Sensors also not insignificantly requires the overall design for a complete Counter and brings additional problems for example in the pressure resistance, the cost of materials, the weight and affects the whole Production costs. Handling during production, transport, installation, maintenance, Repair is difficult.
Aus der US 4,162,111 ist ein Ultraschallwandler bekannt, der ein piezoelektrisches Element aufweist, das über eine Feder an eine den Ultraschall abstrahlende Membran angepresst ist. Randseitig weist die Membran einen mit der Membran einstückig ausgebildeten, verstärkten, d.h. eine höhere Masse aufweisenden Rand auf, der somit ringartig ausgebildet ist und dazu dient, aufgrund seiner Masse störende Frequenzen zu dämpfen. Der Rand ist in seiner Längsausdehnung möglichst kurz gehalten und ist auf der Höhe des piezoelektrischen Elementes angeordnet.From US 4,162,111 an ultrasonic transducer is known, which is a piezoelectric Element having, via a spring to an ultrasonic radiating Membrane is pressed. On the edge, the membrane has one with the membrane integrally formed, reinforced, i. a higher mass edge on, which is thus ring-shaped and serves, due to its mass to dampen interfering frequencies. The edge is in its longitudinal extension kept as short as possible and is at the height of the piezoelectric element arranged.
Ausgehend von diesem Stand der Technik ist es Aufgabe der Erfindung, einen verbesserten Ultraschallwandler bereitzustellen, mit dem die vorgenannten Nachteile zumindest wesentlich reduziert werden können, indem der Wandler mit möglichst kleinen Abmessungen gefertigt werden kann.Based on this prior art, it is an object of the invention to provide a to provide improved ultrasonic transducer, with the aforementioned Disadvantages can be at least significantly reduced by using the converter as small as possible dimensions can be made.
Diese Aufgabe wird gelöst durch einen Ultraschallwandler mit den Merkmalen des Anspruchs 1.This object is achieved by an ultrasonic transducer with the features of Claim 1.
Der erfindungsgemäße Ultraschallwandler weist in bekannter Weise ein Gehäuse, wenigstens ein piezoelektrisches Element und eine den Ultraschall abstrahlende bzw. aufnehmende Membran auf, an deren Rand ein Massering angeordent ist. Erfindungsgemäß ist weiter vorgesehen, dass der Ultraschallwandler nach dem Längsschwingertyp ausgebildet ist, dass der Massering separat von der Membran ist und randinnenseitig mit dieser und mit dem Gehäuse verbunden ist und dass das Gehäuse innenseitig ein Dämpfungselement aufweist, das ringförmig ausgebildet ist und dem Massering benachbart angeordnet ist.The ultrasonic transducer according to the invention has a housing in a known manner, at least one piezoelectric element and one emitting the ultrasound or receiving membrane on the edge of a mass ring is angeordent. According to the invention, it is further provided that the ultrasonic transducer after the Longitudinal oscillator type is formed, that the mass ring separately from the membrane is and is connected on the inside edge with this and with the housing and that the housing has on the inside a damping element which is annular is formed and arranged adjacent to the ground ring.
In dieser erfindungsgemäßen Ausbildung ist es möglich, den Durchmesser des Wandlers sehr klein auszubilden relativ zur Arbeitsfrequenz. D.h. bei gleicher Arbeitsfrequenz ist der Wandler kleiner als bisher bekannte Wandler, wobei aber dennoch eine ausreichende Versteifung und Dämpfung des schwingenden Systems gegeben ist, so dass Nebenresonanzen verhindert werden. Dies ist ein durch die randinnenseitige Anordnung des von der Membran aber separaten, also getrennten Masseringes bedingter wesentlicher Effekt, den die Erfinder gefunden haben, der noch durch das benachbart zum Massering angeordnete Dämpfungselement verstärkt wird, das eine weiteren Reduzierung parasitärer Nebenresonanzen bewirkt.In this embodiment of the invention, it is possible to change the diameter of the Transducer very small form relative to the working frequency. That at the same Working frequency, the converter is smaller than previously known converter, but nevertheless a sufficient stiffening and damping of the oscillating system is given, so that side resonances are prevented. This is one through the edge inside arrangement of the membrane but separate, so separate Masseringes conditional substantial effect that the inventors have found that nor by the damping element arranged adjacent to the mass ring is amplified, a further reduction of parasitic side resonances causes.
Es ist dabei von Vorteil, wenn der Massering mit der Membran verschraubt ist, so dass der Massering und die Membran in definierter Position zueinander und fest miteinander verbunden sind. Gleiches gilt für die Verbindung des Masseringes mit dem Gehäuse.It is advantageous if the mass ring is screwed to the membrane, so that the mass ring and the membrane in a defined position to each other and firmly connected to each other. The same applies to the connection of the mass ring with the housing.
Häufig werden die Ultraschallwandler in Durchflusszählern für aggressive und gefahrvolle sowie unter hohem Druck und Temperatur stehende Medien eingesetzt, so dass vorteilhafterweise die Membran und das Gehäuse auf der Höhe des Masseringes miteinander verschweißt sind. Damit ist eine absolute Dichtigkeit des Wandlers gegeben.Frequently, the ultrasonic transducers in flow meters for aggressive and hazardous and high pressure and temperature media used, so that advantageously the membrane and the housing at the level of Masseringes are welded together. This is an absolute tightness of the Given converter.
Damit das Dämpfungselement fest an dem den Ultraschall parasitär weiterleitenden Gehäuse anliegt und seine Dämpfungswirkung optimal entfalten kann, besteht das Dämpfungselement aus einem elastischen Material, vorzugsweise einem gummiartigen Material.So that the damping element firmly on the ultrasonic parasitic forwarding Housing rests and can develop its damping effect optimally, there is the Damping element made of an elastic material, preferably one rubbery material.
In einer Ausführungsform der Erfindung kann der separate Massering auch einstückig mit dem Gehäuse ausgebildet sein. Die Bezeichnung "separat" soll lediglich andeuten, dass der Massering getrennt von der Membran vorgesehen ist, denn das ist ein wesentliches Merkmal der Erfindung, dass die vorteilhafte Dämpfung maßgeblich bewirkt.In one embodiment of the invention, the separate mass ring may also be formed integrally with the housing. The term "separate" should merely indicate that the mass ring is separate from the membrane, because that is an essential feature of the invention that the advantageous Damping causes significant.
Im Folgenden wird die Erfindung anhand eines Ausführungsbeispiels unter Bezugnahme auf die Zeichnung im Einzelnen erläutert. In der Zeichnung zeigen:
- Fig. 1
- einen Querschnitt eines erfindungsgemäßen Ultraschallwandlers;
- Fig. 2
- eine Messanordnung zur Messung eines Durchflusses eines Fluids unter Einsatz erfindungsgemäßer Ultraschallwandler;
- Fig. 3
- einen Teilbereich des Ultraschallwandlers einer weiteren Ausführungsform.
- Fig. 1
- a cross section of an ultrasonic transducer according to the invention;
- Fig. 2
- a measuring arrangement for measuring a flow of a fluid using ultrasound transducers according to the invention;
- Fig. 3
- a portion of the ultrasonic transducer of another embodiment.
In Fig. 2 ist eine Messanordnung 10 dargestellt, die das Messprinzip, beispielsweise
eines Ultraschall-Gasdurchflusszählers verdeutlicht. In einer Rohrleitung 12 strömt
ein Gas in Strömungsrichtung 14. In der Rohrleitung 12 sind identisch ausgebildete
Ultraschallwandler 16 und 18 angeordnet, die einen Messpfad 20 definieren. Die
Ultraschallwandler 16, 18 sind geeignet elektrische Signale in Ultraschall
umzuwandeln und umgekehrt, zum Senden und Empfangen von Ultraschall. Der
Messpfad 20 ist in einem Winkel ungleich 90° zu einer Längsachse 22 der
Rohrleitung 12 angeordnet, so dass die in entgegengesetzter Richtung entlang des
Messpfades 20 gesandten Ultraschallsignale aufgrund der Gasströmung 14 eine
Laufzeitdifferenz aufweisen. Aus der Laufzeitdifferenz und der entsprechenden
Geometrie lässt sich die Strömungsgeschwindigkeit und damit der
Volumendurchfluss des Gases bestimmen.In Fig. 2, a
Der Ultraschallwandler 16 (Fig. 1) weist ein Ultraschall erzeugendes Element 30
auf, das aus zwei Piezokeramiken 32, 34 bestehen kann, die mit einer elektrischen
Leitung 36 verbunden sind. Die elektrische Leitung 36 ist elektrisch isolierend
geführt. Das piezoelektrische Element 30 ist zwischen zwei zylindrischen
Spannabschnitten 40 und 42 eingespannt. Die beiden Spannabschnitte 40 und 42
sind über ein Spannorgan 44 miteinander verbunden, so dass das piezoelektrische
Element 30 zwischen den Spannabschnitten verspannt gehalten ist. Die freie
Stirnseite 46 des Spannabschnitts 42 dient als Sende- und/oder Empfangsfläche,
über welche die Ultraschallsignale abgestrahlt bzw. empfangen werden.The ultrasonic transducer 16 (FIG. 1) has an
Zur Vergrößerung der Stirnfläche 46 ist die Stirnseite als Biegeplatte 48 ausgebildet
und wird im Folgenden als Membran 48 bezeichnet. Zur Aussendung von
Ultraschallsignalen schwingt die Membran 48 entsprechend der von dem
piezoelektrischen Element 30 erzeugten und über den starren Spannabschnitt 42
übertragenen Ultraschallschwingungen und strahlt so die Ultraschallsignale ab. Zum
Empfang von Ultraschallsignalen verläuft die Signalfolge umgekehrt und die
Membran 48 nimmt die Ultraschallschwingungen auf, die über den Spannabschnitt
42 an das piezoelektrische Element 30 geleitet werden, das die Schwingungen in
elektrische Signale umwandelt.To increase the
Die Membran 48 weist einen abgewinkelten Rand 50 auf, an den sich ein Gehäuse
52, das die vorgenannten signalleitenden und signalverarbeitenden Komponenten
umgibt. Das Gehäuse 52 ist im wesentlichen zylindrisch ausgebildet.The
An seiner Innenseite ist der Rand 50 der Membran 48 mit einem Massering 54
verbunden, vorzugsweise verschraubt. Der Massering ist nur randseitig mit der
Membran 48 verbunden, also nur im Bereich des Randes 50, damit die Membran 48
eine möglichst große Fläche zum Schwingen hat. Somit ist der innenseitig
angeordnete Massering 54 von der Membran 48 über eine Lücke L beabstandet.On its inside is the
Der in den Rand 50 eingeschraubte Massering 54 steht über den Rand 50 hinaus,
so dass der Massering 54 auch mit dem Gehäuse 52 verbindbar, insbesondere
verschraubbar ist. Da das Gehäuse in geeigneter und nicht näher dargestellter
Weise, z.B. über einen an seinem der Membran 48 abgewandten Ende 58
angeordneten Flansch, in dem Durchflusszähler festlegbar ist, sind über den
Massering 54 auch die signalleitenden und signalverarbeitenden Komponenten
gehalten. The
Um eine absolute Dichtigkeit des Wandlers 16 zu erreichen, ist das Gehäuse 52 mit
dem Rand 50 verschweißt.In order to achieve an absolute tightness of the
Zur weiteren Reduzierung von parasitären Schwingungen weist das Gehäuse 52
innenseitig ein Dämpfungselement 64 auf, das aus einem elastischen Material,
beispielsweise Gummi, bestehen kann. Das Dämpfungselement ist ringförmig
ausgebildet, so dass es an der Innenseite des Gehäuses 52 zu liegen kommen
kann und ist vorteilhafterweise dem Massering 54 benachbart angeordnet.To further reduce parasitic vibrations, the
In einer weiteren, in Fig. 3 dargestellten Ausführungsform, kann der Massering 54
auch einstückig mit dem Gehäuse 52 ausgebildet sein.In a further embodiment, shown in FIG. 3, the
Claims (6)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| PL04017189T PL1515303T3 (en) | 2003-09-09 | 2004-07-21 | Ultrasound transducer assembly including a mass ring for the damping of interfering resonances |
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE10341422A DE10341422A1 (en) | 2003-09-09 | 2003-09-09 | Ultrasound transducer assembly |
| DE10341422 | 2003-09-09 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| EP1515303A1 true EP1515303A1 (en) | 2005-03-16 |
| EP1515303B1 EP1515303B1 (en) | 2006-09-20 |
Family
ID=34129700
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP04017189A Expired - Lifetime EP1515303B1 (en) | 2003-09-09 | 2004-07-21 | Ultrasound transducer assembly including a mass ring for the damping of interfering resonances |
Country Status (6)
| Country | Link |
|---|---|
| US (1) | US20050054932A1 (en) |
| EP (1) | EP1515303B1 (en) |
| AT (1) | ATE340398T1 (en) |
| DE (2) | DE10341422A1 (en) |
| ES (1) | ES2271748T3 (en) |
| PL (1) | PL1515303T3 (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2008147325A1 (en) * | 2007-06-01 | 2008-12-04 | Axsensor Ab | Piezoelectric transducer device |
| DE102012209238A1 (en) * | 2012-05-31 | 2013-12-05 | Robert Bosch Gmbh | An ultrasonic sensor and apparatus and method for measuring a distance between a vehicle and an obstacle |
Families Citing this family (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE102008027970B4 (en) * | 2008-06-12 | 2013-04-04 | Hella Kgaa Hueck & Co. | ultrasonic sensor |
| DE102010064117A1 (en) | 2010-12-23 | 2012-06-28 | Endress + Hauser Flowtec Ag | Ultrasonic transducer housing for use in volumetric flow meter, has attenuator comprising membrane-side end section, and sectional plane whose longitudinal axis lies monotonic to longitudinal axis of housing |
| DE102014104134A1 (en) * | 2014-03-25 | 2015-10-01 | Hydrovision Gmbh | Acoustic flow measurement device and method for such a device |
| DE102015110939B4 (en) | 2015-07-07 | 2019-02-14 | Valeo Schalter Und Sensoren Gmbh | Ultrasonic sensor for a motor vehicle, motor vehicle and method for producing an ultrasonic sensor |
| DE102015113561A1 (en) | 2015-08-17 | 2017-02-23 | Endress + Hauser Flowtec Ag | Ultrasonic transducers for use in ultrasonic flowmeters for measuring the flow rate or volume flow of media in a pipeline, and a method of making such an ultrasonic transducer |
| US10585178B2 (en) * | 2015-10-21 | 2020-03-10 | Semiconductor Componenents Industries, Llc | Piezo transducer controller and method having adaptively-tuned linear damping |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB1086640A (en) * | 1963-12-16 | 1967-10-11 | Nat Res Dev | Damping backing for piezo-electric crystal or transducer |
| US4162111A (en) * | 1977-08-25 | 1979-07-24 | E. I. Du Pont De Nemours And Company | Piezoelectric ultrasonic transducer with damped housing |
| JPS6194496A (en) * | 1984-10-16 | 1986-05-13 | Nissan Motor Co Ltd | Ultrasonic microphone |
| EP0897101A1 (en) * | 1997-08-14 | 1999-02-17 | Electrowatt Technology Innovation AG | Ultrasonic flowmeter |
| DE10040344A1 (en) * | 2000-08-17 | 2002-02-28 | Sick Ag | ultrasound transducer |
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|---|---|---|---|---|
| US2803129A (en) * | 1951-05-28 | 1957-08-20 | Council Scient Ind Res | Apparatus for testing of elastic materials |
| US3989965A (en) * | 1973-07-27 | 1976-11-02 | Westinghouse Electric Corporation | Acoustic transducer with damping means |
| DE3137745A1 (en) * | 1981-09-23 | 1983-04-07 | Egon 5000 Köln Gelhard | SENSOR FOR PERFORMING THE DISTANCE MEASUREMENT ACCORDING TO THE ULTRASONIC ECHOPRINZIP |
| US4746831A (en) * | 1985-03-27 | 1988-05-24 | Kaijo Denki Co., Ltd. | Ultrasonic transreceiver |
| DE19744229A1 (en) * | 1997-10-07 | 1999-04-29 | Bosch Gmbh Robert | Ultrasonic transducer |
| US6217530B1 (en) * | 1999-05-14 | 2001-04-17 | University Of Washington | Ultrasonic applicator for medical applications |
| DE10023302C2 (en) * | 2000-05-15 | 2003-11-13 | Grieshaber Vega Kg | Piezoelectric excitable vibrating element |
| DE50202211D1 (en) * | 2002-03-01 | 2005-03-17 | Sick Engineering Gmbh | Ultrasonic transducer arrangement with ultrasonic filter |
-
2003
- 2003-09-09 DE DE10341422A patent/DE10341422A1/en not_active Withdrawn
-
2004
- 2004-07-21 AT AT04017189T patent/ATE340398T1/en active
- 2004-07-21 EP EP04017189A patent/EP1515303B1/en not_active Expired - Lifetime
- 2004-07-21 ES ES04017189T patent/ES2271748T3/en not_active Expired - Lifetime
- 2004-07-21 PL PL04017189T patent/PL1515303T3/en unknown
- 2004-07-21 DE DE502004001520T patent/DE502004001520D1/en not_active Expired - Lifetime
- 2004-09-08 US US10/936,979 patent/US20050054932A1/en not_active Abandoned
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB1086640A (en) * | 1963-12-16 | 1967-10-11 | Nat Res Dev | Damping backing for piezo-electric crystal or transducer |
| US4162111A (en) * | 1977-08-25 | 1979-07-24 | E. I. Du Pont De Nemours And Company | Piezoelectric ultrasonic transducer with damped housing |
| JPS6194496A (en) * | 1984-10-16 | 1986-05-13 | Nissan Motor Co Ltd | Ultrasonic microphone |
| EP0897101A1 (en) * | 1997-08-14 | 1999-02-17 | Electrowatt Technology Innovation AG | Ultrasonic flowmeter |
| DE10040344A1 (en) * | 2000-08-17 | 2002-02-28 | Sick Ag | ultrasound transducer |
Non-Patent Citations (2)
| Title |
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| PATENT ABSTRACTS OF JAPAN vol. 010, no. 272 (E - 437) 16 September 1986 (1986-09-16) * |
| PATENT ABSTRACTS OF JAPAN vol. 013, no. 231 (P - 878) 29 May 1989 (1989-05-29) * |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2008147325A1 (en) * | 2007-06-01 | 2008-12-04 | Axsensor Ab | Piezoelectric transducer device |
| US8179024B2 (en) | 2007-06-01 | 2012-05-15 | Axsensor Ab | Piezoelectric transducer device |
| DE102012209238A1 (en) * | 2012-05-31 | 2013-12-05 | Robert Bosch Gmbh | An ultrasonic sensor and apparatus and method for measuring a distance between a vehicle and an obstacle |
| US9383443B2 (en) | 2012-05-31 | 2016-07-05 | Robert Bosch Gmbh | Ultrasonic sensor and device and method for measuring a distance between a vehicle and an obstacle |
Also Published As
| Publication number | Publication date |
|---|---|
| DE10341422A1 (en) | 2005-03-31 |
| EP1515303B1 (en) | 2006-09-20 |
| DE502004001520D1 (en) | 2006-11-02 |
| US20050054932A1 (en) | 2005-03-10 |
| ES2271748T3 (en) | 2007-04-16 |
| PL1515303T3 (en) | 2007-01-31 |
| ATE340398T1 (en) | 2006-10-15 |
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