EP0451306A1 - Frequency-selective laminated ultrasound transducer - Google Patents

Frequency-selective laminated ultrasound transducer Download PDF

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Publication number
EP0451306A1
EP0451306A1 EP90106773A EP90106773A EP0451306A1 EP 0451306 A1 EP0451306 A1 EP 0451306A1 EP 90106773 A EP90106773 A EP 90106773A EP 90106773 A EP90106773 A EP 90106773A EP 0451306 A1 EP0451306 A1 EP 0451306A1
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EP
European Patent Office
Prior art keywords
ultrasonic
layer
frequency
ultrasonic layer
glass breakage
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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
Application number
EP90106773A
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German (de)
French (fr)
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EP0451306B1 (en
Inventor
Hans-Joachim Burger
Rudolf Dipl.-Phys. Thurn
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Siemens AG
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Siemens AG
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Publication date
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Priority to DE59010738T priority Critical patent/DE59010738D1/en
Priority to EP90106773A priority patent/EP0451306B1/en
Priority to AT90106773T priority patent/ATE155601T1/en
Priority to JP3100373A priority patent/JPH04227399A/en
Publication of EP0451306A1 publication Critical patent/EP0451306A1/en
Priority to US08/301,521 priority patent/US5457353A/en
Application granted granted Critical
Publication of EP0451306B1 publication Critical patent/EP0451306B1/en
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B06—GENERATING OR TRANSMITTING MECHANICAL VIBRATIONS IN GENERAL
    • B06B—METHODS OR APPARATUS FOR GENERATING OR TRANSMITTING MECHANICAL VIBRATIONS OF INFRASONIC, SONIC, OR ULTRASONIC FREQUENCY, e.g. FOR PERFORMING MECHANICAL WORK IN GENERAL
    • B06B1/00—Methods or apparatus for generating mechanical vibrations of infrasonic, sonic, or ultrasonic frequency
    • B06B1/02—Methods or apparatus for generating mechanical vibrations of infrasonic, sonic, or ultrasonic frequency making use of electrical energy
    • B06B1/06—Methods or apparatus for generating mechanical vibrations of infrasonic, sonic, or ultrasonic frequency making use of electrical energy operating with piezoelectric effect or with electrostriction
    • B06B1/0644—Methods or apparatus for generating mechanical vibrations of infrasonic, sonic, or ultrasonic frequency making use of electrical energy operating with piezoelectric effect or with electrostriction using a single piezoelectric element
    • B06B1/0662—Methods or apparatus for generating mechanical vibrations of infrasonic, sonic, or ultrasonic frequency making use of electrical energy operating with piezoelectric effect or with electrostriction using a single piezoelectric element with an electrode on the sensitive surface
    • B06B1/067—Methods or apparatus for generating mechanical vibrations of infrasonic, sonic, or ultrasonic frequency making use of electrical energy operating with piezoelectric effect or with electrostriction using a single piezoelectric element with an electrode on the sensitive surface which is used as, or combined with, an impedance matching layer
    • 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 ultrasound film converter.
  • Previously known ultrasound layer transducers are designed as broadband near-distance transducers (EP 0 154 706 A2) or as wide-beam proximity sensors. They have high mechanical damping, ie low sensitivity, and are comparatively expensive due to high material and manufacturing costs.
  • Another disadvantage of previously known ultrasonic layer transducers is their narrow directional diagram in certain frequency ranges, which is undesirable, for example, when used for all-round detection of glass breakages, for example in motor vehicles.
  • Conventional converters with a very large bandwidth can be used for this application, which absorb the ultrasonic vibrations emitted when a glass plate is broken and convert them into an electrical signal with corresponding frequencies.
  • the break frequencies that are typical for glass breakage enable a glass pane break to be detected by means of an evaluation circuit connected downstream of the ultrasound transducer.
  • the evaluation device must first separate the break frequencies mentioned, for example by filters, from the entire spectrum in which the ultrasonic transducer is sensitive; because only the signals occurring at the relevant break frequencies are relevant for the detection of a broken glass pane.
  • an ultrasound layer converter that is only sensitive to certain frequencies, such as the breakage frequencies when breaking a glass pane, in order in this way to to be able to do without filters otherwise necessary in the evaluation circuit or at least to be able to keep the effort for the filters low.
  • the objects according to claims 2 and 3 represent advantageous configurations.
  • the objects according to claims 3 to 5 are also advantageously designed, since the mechanical damping of the ultrasound layer converter can be varied within wide limits by adding fillers. The range of converter modes can thus be increased in a targeted and defined manner if an additional evaluation of transient processes is desired. If an evaluation device is connected downstream of the ultrasound layer converter, with which received ultrasound spectra can be compared and evaluated with the ultrasound spectrum typical for glass breakage, this represents a simple embodiment for the detection of a glass pane break. A further simplification is given if the glass breakage detection arrangement contains a microprocessor for storing the contains ultrasound spectra typical for glass breakage.
  • the 1 shows an ultrasound layer transducer with a rectangular piezoceramic plate 1, which is preferably surrounded on both sides by a layer 2 made of plastic material with low acoustic impedance.
  • the two layers 2 consist, for example, of epoxy resin filled with hollow glass spheres.
  • the geometrical external dimensions of the cuboid ultrasonic layer transducer are adjusted so that the effective sound velocities of the plastic-ceramic composite result in narrow-band resonance points of sensitivity at the frequencies at which the characteristic maxima also occur in the glass breakage spectrum to be evaluated.
  • the glass breakage emission can thus advantageously be registered frequency-selectively with high sensitivity.
  • the plastic-ceramic composite mentioned is surrounded by elastic embedding material 3, which contains variable fillers for damping.
  • the narrow long side 5 or broad side 6 of the ultrasonic layer transducer can be used as a sound-receiving surface. It is kept free of the embedding material 3.
  • the dimensions of such an ultrasound layer transducer can be, for example, 20 x 10 x 2 mm, the piezoceramic plate having dimensions of, for example, 20 x 10 x 0.2 mm.
  • Such an ultrasonic layer converter has selective reception sensitivity at 60 and 120 kHz.
  • the narrow long side is used as the sound-receiving surface.
  • the broad part of the astigmatic directional diagram is greater than 120 ° at both frequencies.
  • This ultrasonic layer converter is therefore suitable for use, for example, in a glass breakage detector for motor vehicles; because this ultrasonic film converter is robust and inexpensive and also has a high sensitivity in a wide opening angle range (greater than 120 °). This enables the interior of a motor vehicle to be monitored by a single ultrasound film converter.
  • 1 is instead of a rectangular shape of the piezoceramic plate Shapes, such as round shapes or other polygon shapes can be realized.
  • the resonance frequencies mentioned above are calculated according to the known physical laws, i.e. they depend on the speed of sound in the material as well as on the dimensions. Due to the cuboid structure, there are three basic resonances, namely in addition to the longitudinal resonance also a width and thickness resonance. In circular disc-shaped versions, there are the fundamental vibration modes of the thickness vibration and the radial vibration. If you want to use additional vibration modes and thus frequencies, you can use the harmonics of the respective vibrations, the frequencies of which are multiples of the fundamental vibration.
  • the use of such an ultrasonic transducer is not limited to glass breakage detection.
  • the selective tuning of the transducer resonance frequencies can also be carried out for the spectrum of other ultrasound emissions to be measured. E.g. the characteristic emission spectrum of moving machine parts can be examined in order to test these parts for functionality or wear.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Acoustics & Sound (AREA)
  • Multimedia (AREA)
  • Investigating Or Analyzing Materials By The Use Of Ultrasonic Waves (AREA)
  • Burglar Alarm Systems (AREA)
  • Transducers For Ultrasonic Waves (AREA)

Abstract

For certain applications, for example in glass fracture detection, it is of advantage to use frequency-selective ultrasonic transducers. In this case, it is not necessary to connect elaborate follow-up filter arrangements for filtering out relevant frequency components of the recorded ultrasonic spectrum. A laminated ultrasonic transducer which has high response sensitivity for particular frequencies to be specified can be created by at least one of its geometric dimensions being specifically adapted to the frequency selectivity required from it. The laminated ultrasonic transducer preferably has a piezoceramic platelet (1) which is surrounded by a layer (2) of low acoustic impedance on at least one of its two plate surfaces. The piezoceramic platelet (1) is suitably rectangular, resulting in a cuboid body. One of the dimensions of height, length and width is determined in such a manner that it corresponds to a desired fundamental frequency of oscillation. <IMAGE>

Description

Die Erfindung betrifft einen Ultraschall-Schichtwandler.The invention relates to an ultrasound film converter.

Bisher bekannte Ultraschall-Schichtwandler sind als breitbandige Nahdistanzwandler (EP 0 154 706 A2) oder als breitstrahlende Näherungssensoren konzipiert. Sie weisen eine hohe mechanische Dämpfung, d.h. geringe Empfindlichkeit auf und sind infolge hoher Material- und Fertigungskosten vergleichsweise teuer. Ein weiterer Nachteil bisher bekannter Ultraschall-Schichtwandler ist ihr schmales Richtdiagramm in bestimmten Frequenzbereichen, was beispielsweise beim Einsatz zur Rundum-Detektion von Glasbrüchen, z.B. in Kraftfahrzeugen, unerwünscht ist. Für diesen Anwendungsfall können zwar herkömmliche Wandler mit sehr großer Bandbreite verwendet werden, die die beim Brechen einer Glasplatte abgestrahlten Ultraschall-Schwingungen aufnehmen und diese in ein elektrisches Signal mit entsprechenden Frequenzen umwandeln. Die beim Glasbruch typischen Bruchfrequenzen ermöglichen mittels einer dem Ultraschallwandler nachgeschalteten Auswerteschaltung, einen Glasscheibenbruch zu erkennen. Das Auswertegerät muß hierbei zunächst aus dem gesamten Spektrum, in dem der Ultraschallwandler empfindlich ist, die genannten Bruchfrequenzen, z.B. durch Filter, heraustrennen; denn nur die an den betreffenden Bruchfrequenzen auftretenden Signale sind zur Feststellung eines Glasscheibenbruchs relevant. Um z.B. eine solche Auswerteeinrichtung einer Glasbruchmeldeanordnung zu vereinfachen und damit auch Kosten zu sparen, wäre es vorteilhaft, einen Ultraschall-Schichtwandler einzusetzen, der nur für bestimmte Frequenzen, wie z.B. die Bruchfrequenzen beim Brechen einer Glasscheibe, empfindlich ist, um auf diese Weise auf den ansonsten in der Auswerteschaltung notwendigen Filter verzichten zu können oder wenigstens den Aufwand bei den Filtern gering halten zu können.Previously known ultrasound layer transducers are designed as broadband near-distance transducers (EP 0 154 706 A2) or as wide-beam proximity sensors. They have high mechanical damping, ie low sensitivity, and are comparatively expensive due to high material and manufacturing costs. Another disadvantage of previously known ultrasonic layer transducers is their narrow directional diagram in certain frequency ranges, which is undesirable, for example, when used for all-round detection of glass breakages, for example in motor vehicles. Conventional converters with a very large bandwidth can be used for this application, which absorb the ultrasonic vibrations emitted when a glass plate is broken and convert them into an electrical signal with corresponding frequencies. The break frequencies that are typical for glass breakage enable a glass pane break to be detected by means of an evaluation circuit connected downstream of the ultrasound transducer. The evaluation device must first separate the break frequencies mentioned, for example by filters, from the entire spectrum in which the ultrasonic transducer is sensitive; because only the signals occurring at the relevant break frequencies are relevant for the detection of a broken glass pane. For example, to simplify such an evaluation device for a glass breakage detection arrangement and thus also to save costs, it would be advantageous to use an ultrasound layer converter that is only sensitive to certain frequencies, such as the breakage frequencies when breaking a glass pane, in order in this way to to be able to do without filters otherwise necessary in the evaluation circuit or at least to be able to keep the effort for the filters low.

Daher liegt der Erfindung die Aufgabe zugrunde, einen Ultraschall-Schichtwandler zu schaffen, der für bestimmte vorzugebende Frequenzen hohe Ansprechempfindlichkeit aufweist.It is therefore the object of the invention to create an ultrasound layer transducer which has a high sensitivity for certain frequencies to be specified.

Diese Aufgabe wird dadurch gelöst, daß zumindest eine der geometrischen Abmessungen des Ultraschall-Schichtwandlers gezielt der an ihn geforderten Frequenzselektivität angepaßt ist. Die Gegenstände nach Anspruch 2 und 3 stellen vorteilhafte Ausgestaltungen dar. Ebenfalls sind auch die Gegenstände gemäß Anspruch 3 bis 5 vorteilhaft ausgebildet, da hier mittels der Zugabe von Füllstoffen die mechanische Dämpfung des Ultraschall-Schichtwandlers in weiten Grenzen variierbar ist. Die Bandbreite der Wandlermoden kann somit gezielt und definiert vergrößert werden, wenn eine zusätzliche Auswertung von Einschwingvorgängen gewünscht wird. Ist dem Ultraschall-Schichtwandler ein Auswertegerät nachgeschaltet, mit welchem empfangene Ultraschallspektren mit dem für Glasbruch typischen Ultraschallspektrum vergleichbar und auswertbar sind, so stellt dies eine einfache Ausführung zur Detektion eines Glasscheibenbruchs dar. Eine weitere Vereinfachung ist gegeben, wenn die Glasbruchmeldeanordnung einen Mikroprozessor zur Abspeicherung des für Glasbruch typischen Ultraschallspektrums enthält.This object is achieved in that at least one of the geometric dimensions of the ultrasound layer transducer is specifically adapted to the frequency selectivity required of it. The objects according to claims 2 and 3 represent advantageous configurations. The objects according to claims 3 to 5 are also advantageously designed, since the mechanical damping of the ultrasound layer converter can be varied within wide limits by adding fillers. The range of converter modes can thus be increased in a targeted and defined manner if an additional evaluation of transient processes is desired. If an evaluation device is connected downstream of the ultrasound layer converter, with which received ultrasound spectra can be compared and evaluated with the ultrasound spectrum typical for glass breakage, this represents a simple embodiment for the detection of a glass pane break. A further simplification is given if the glass breakage detection arrangement contains a microprocessor for storing the contains ultrasound spectra typical for glass breakage.

Ein Ausführungsbeispiel der Erfindung wird im folgenden anhand einer Zeichnung näher erläutert.An embodiment of the invention is explained below with reference to a drawing.

Es zeigen:

  • FIG 1 einen Querschnitt eines Ultraschall-Schichtwandlers und
  • FIG 2 eine Draufsicht desselben.
Show it:
  • 1 shows a cross section of an ultrasonic layer transducer and
  • 2 shows a plan view of the same.

In FIG 1 ist ein Ultraschall-Schichtwandler mit einem rechteckigen Piezokeramikplättchen 1 dargestellt, das vorzugsweise beidseits von jeweils einer Schicht 2 aus Kunststoffmaterial niedriger akustischer Impedanz umgeben ist. Die beiden Schichten 2 bestehen z.B. aus mit Hohglaskugeln gefülltem Epoxidharz. Die geometrischen Außenmaße des quaderförmigen Ultraschall-Schichtwandlers sind so abgestimmt, daß sich mit den effektiven Schallgeschwindigkeiten des Kunststoff-Keramik-Verbundes schmalbandige Resonanzstellen der Empfindlichkeit bei den Frequenzen ergeben, bei denen auch im auszuwertenden Glasbruchspektrum die charakteristischen Maxima auftreten. Somit kann vorteilhafterweise die Glasbruch-Emission frequenzselektiv mit hoher Empfindlichkeit registriert werden. Der genannte Kunststoff-Keramik-Verbund ist von elastischem Einbettmaterial 3 umgeben, welches mengenmäßig variierbare Füllstoffe zur Dämpfung enthält. Dies bedeutet, daß durch Zugabe der Füllstoffe die mechanische Dämpfung des elastischen Einbettmaterials 3 in weiten Grenzen veränderbar ist. So kann die Bandbreite der Wandlermoden gezielt und definiert vergrößert werden, wenn eine zusätzliche Auswertung von Einschwingvorgängen gewünscht wird. Die schmale Längs- 5 oder Breitseite 6 des Ultraschall-Schichtwandlers kann als schallempfangende Oberfläche benutzt werden. Sie wird von dem Einbettmaterial 3 freigehalten. Die Abmessungen eines derartigen Ultraschall-Schichtwandlers können beispielsweise 20 x 10 x 2 mm betragen, wobei das Piezokeramikplättchen Abmessungen von beispielsweise 20 x 10 x 0,2 mm aufweist. Ein solcher Ultraschall-Schichtwandler besitzt selektive Empfangsempfindlichkeit bei 60 und 120 kHz. Als schallempfangende Fläche wird die schmale Längsseite benutzt. Der breite Teil des astigmatischen Richtdiagramms ist hier bei beiden Frequenzen größer als 120°. Somit ist dieser Ultraschall-Schichtwandler zum Einsatz z.B. in einem Glasbruchdetektor für Kraftfahrzeuge geeignet; denn dieser Ultraschall-Schichtwandler ist robust und kostengünstig und hat zudem in einem weiten Öffnungswinkelbereich (größer 120°) eine hohe Empfindlichkeit. Damit ist die Möglichkeit gegeben, den Innenraum einen Kraftfahrzeugs durch einen einzigen Ultraschall-Schichtwandler zu überwachen. Abweichend von der dargestellten Ausführungsform ist die Ausbildung eines Ultraschall-Schichtwandlers möglich, dessen Piezokeramikplättchen 1 nur auf einer Seite mit einer Schicht 2 niedriger akustischer Impedanz umgeben ist. Außerdem sind anstelle einer Rechteckform des Piezokeramikplättchens 1 andere Formen, z.B. runde Formen oder andere Vieleckformen realisierbar.1 shows an ultrasound layer transducer with a rectangular piezoceramic plate 1, which is preferably surrounded on both sides by a layer 2 made of plastic material with low acoustic impedance. The two layers 2 consist, for example, of epoxy resin filled with hollow glass spheres. The geometrical external dimensions of the cuboid ultrasonic layer transducer are adjusted so that the effective sound velocities of the plastic-ceramic composite result in narrow-band resonance points of sensitivity at the frequencies at which the characteristic maxima also occur in the glass breakage spectrum to be evaluated. The glass breakage emission can thus advantageously be registered frequency-selectively with high sensitivity. The plastic-ceramic composite mentioned is surrounded by elastic embedding material 3, which contains variable fillers for damping. This means that the mechanical damping of the elastic embedding material 3 can be varied within wide limits by adding the fillers. In this way, the range of converter modes can be increased in a targeted and defined manner if an additional evaluation of transient processes is desired. The narrow long side 5 or broad side 6 of the ultrasonic layer transducer can be used as a sound-receiving surface. It is kept free of the embedding material 3. The dimensions of such an ultrasound layer transducer can be, for example, 20 x 10 x 2 mm, the piezoceramic plate having dimensions of, for example, 20 x 10 x 0.2 mm. Such an ultrasonic layer converter has selective reception sensitivity at 60 and 120 kHz. The narrow long side is used as the sound-receiving surface. The broad part of the astigmatic directional diagram is greater than 120 ° at both frequencies. This ultrasonic layer converter is therefore suitable for use, for example, in a glass breakage detector for motor vehicles; because this ultrasonic film converter is robust and inexpensive and also has a high sensitivity in a wide opening angle range (greater than 120 °). This enables the interior of a motor vehicle to be monitored by a single ultrasound film converter. Deviating from the embodiment shown, it is possible to form an ultrasound layer transducer, the piezoceramic plate 1 of which is surrounded on one side only by a layer 2 of low acoustic impedance. In addition, 1 is instead of a rectangular shape of the piezoceramic plate Shapes, such as round shapes or other polygon shapes can be realized.

Die obengenannten Resonanzfrequenzen berechnen sich nach den bekannten physikalischen Gesetzen, d.h. sie hängen sowohl von der Schallgeschwindigkeit im Material als auch von den Abmessungen ab. Aufgrund des quaderförmigen Aufbaus gibt es demnach drei Grund-Resonanzen, nämlich neben der Längsresonanz auch eine Breiten- und Dickenresonanz. Bei kreisscheibenförmigen Ausführungen gibt es die Grundschwingungsmoden der Dickenschwingung und der Radialschwingung. Will man noch zusätzliche Schwingungsmoden und damit-frequenzen ausnutzen, kann man die Oberwellen der jeweiligen Schwingungen heranziehen, deren Frequenzen bei Vielfachen der Grundschwingung liegen.The resonance frequencies mentioned above are calculated according to the known physical laws, i.e. they depend on the speed of sound in the material as well as on the dimensions. Due to the cuboid structure, there are three basic resonances, namely in addition to the longitudinal resonance also a width and thickness resonance. In circular disc-shaped versions, there are the fundamental vibration modes of the thickness vibration and the radial vibration. If you want to use additional vibration modes and thus frequencies, you can use the harmonics of the respective vibrations, the frequencies of which are multiples of the fundamental vibration.

Der Einsatz eines derartigen Ultraschallwandlers ist aber nicht auf Glasbruchdetektion beschränkt. Die selektive Abstimmung der Wandler-Resonanzfrequenzen kann auch für das zu messende Spektrum anderer Ultraschallemissionen erfolgen. Z.B. kann das charakteristische Emissionsspektrum von bewegten Maschinenteilen untersucht werden, um diese Teile auf Funktionsfähigkeit oder Verschleiß zu prüfen.The use of such an ultrasonic transducer is not limited to glass breakage detection. The selective tuning of the transducer resonance frequencies can also be carried out for the spectrum of other ultrasound emissions to be measured. E.g. the characteristic emission spectrum of moving machine parts can be examined in order to test these parts for functionality or wear.

Claims (8)

Ultraschall-Schichtwandler, dadurch gekennzeichnet, daß zumindest eine seiner geometrischen Abmessungen gezielt der an ihn geforderten Frequenzselektivität angepaßt ist.Ultrasonic layer converter, characterized in that at least one of its geometric dimensions is specifically adapted to the frequency selectivity required of it. Ultraschall-Schichtwandler nach Anspruch 1 dadurch gekennzeichnet, daß er ein Piezokeramikplättchen (1) aufweist, das mindestens auf einer seiner beiden Plattenflächen von einer Schicht (2) niedriger akustischer Impedanz umgeben ist.Ultrasonic layer transducer according to Claim 1, characterized in that it has a piezoceramic plate (1) which is surrounded by a layer (2) of low acoustic impedance on at least one of its two plate surfaces. Ultraschall-Schichtwandler nach Anspruch 1 oder 2, dadurch gekennzeichnet, daß mindestens eine der Abmessungen von Höhe, Länge und Breite dieses quaderförmigen Körpers so bestimmt ist, daß sie einer gewünschten Grundschwingungsfrequenz entspricht.Ultrasonic layer transducer according to claim 1 or 2, characterized in that at least one of the dimensions of height, length and width of this cuboid body is determined so that it corresponds to a desired fundamental frequency. Ultraschall-Schichtwandler nach Anspruch 2 oder 3, dadurch gekennzeichnet, daß er an seinen großen Außenflächen (4) der beiden Schichten von elastischem Einbettmaterial (3) umgeben ist, welches mengenmäßig vorbestimmte Füllstoffe zur Dämpfung enthält.Ultrasonic layer transducer according to claim 2 or 3, characterized in that it is surrounded on its large outer surfaces (4) of the two layers by elastic embedding material (3) which contains predetermined amounts of fillers for damping. Ultraschall-Schichtwandler nach Anspruch 3, dadurch gekennzeichnet, daß die schmale Längs- (5) oder Breitseite (6) als schallempfangende Oberfläche verwendbar ist.Ultrasonic layer transducer according to claim 3, characterized in that the narrow longitudinal (5) or broad side (6) can be used as a sound-receiving surface. Ultraschall-Schichtwandler nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, daß er Bestandteil einer Glasbruchmeldeanordnung ist.Ultrasonic layer converter according to one of the preceding claims, characterized in that it is part of a glass breakage detection arrangement. Ultraschall-Schichtwandler nach Anspruch 6, dadurch gekennzeichnet, daß dem Ultraschall-Schichtwandler ein Auswertegerät nachgeschaltet ist, mit welchem das empfangene Ultraschallspektrum mit dem für Glasbruch typischen Ultraschallspektrum vergleichbar und auswertbar ist.Ultrasonic layer converter according to claim 6, characterized in that the ultrasonic layer converter is followed by an evaluation device with which the received ultrasound spectrum is comparable with the ultrasound spectrum typical for glass breakage and can be evaluated. Ultraschall-Schichtwandler nach Anspruch 6 oder 7, dadurch gekennzeichnet, daß die Glasbruchmeldeanordnung einen Mikroprozessor zur Abspeicherung des für Glasbruch typischen Ultraschallspektrums enthält.Ultrasonic layer converter according to claim 6 or 7, characterized in that the glass breakage detection arrangement contains a microprocessor for storing the ultrasound spectrum typical of glass breakage.
EP90106773A 1990-04-09 1990-04-09 Frequency-selective laminated ultrasound transducer Expired - Lifetime EP0451306B1 (en)

Priority Applications (5)

Application Number Priority Date Filing Date Title
DE59010738T DE59010738D1 (en) 1990-04-09 1990-04-09 Frequency-selective ultrasound layer converter
EP90106773A EP0451306B1 (en) 1990-04-09 1990-04-09 Frequency-selective laminated ultrasound transducer
AT90106773T ATE155601T1 (en) 1990-04-09 1990-04-09 FREQUENCY SELECTIVE ULTRASONIC SLIM TRANSDUCER
JP3100373A JPH04227399A (en) 1990-04-09 1991-04-05 Frequency selection type ultrasonic layerlike converter
US08/301,521 US5457353A (en) 1990-04-09 1994-09-07 Frequency-selective ultrasonic sandwich transducer

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP90106773A EP0451306B1 (en) 1990-04-09 1990-04-09 Frequency-selective laminated ultrasound transducer

Publications (2)

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EP0451306A1 true EP0451306A1 (en) 1991-10-16
EP0451306B1 EP0451306B1 (en) 1997-07-16

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US (1) US5457353A (en)
EP (1) EP0451306B1 (en)
JP (1) JPH04227399A (en)
AT (1) ATE155601T1 (en)
DE (1) DE59010738D1 (en)

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WO1999010874A1 (en) * 1997-08-23 1999-03-04 Fraunhofer-Gesellschaft zur Förderung der angewandten Forschung e.V. Acoustic transducer
DE4431511B4 (en) * 1993-09-23 2006-02-09 Holroyd Instruments Ltd., Bonsall, Matlock Acoustic vibration transducer
CN113504307A (en) * 2021-09-10 2021-10-15 西南石油大学 Multi-frequency core sound velocity measuring device

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US6645150B2 (en) * 2001-01-05 2003-11-11 Bjorn A. J. Angelsen Wide or multiple frequency band ultrasound transducer and transducer arrays
JP2003036483A (en) * 2001-07-25 2003-02-07 Iwata Electric:Kk Alarm signal output device
US6540683B1 (en) 2001-09-14 2003-04-01 Gregory Sharat Lin Dual-frequency ultrasonic array transducer and method of harmonic imaging
US7259499B2 (en) 2004-12-23 2007-08-21 Askew Andy R Piezoelectric bimorph actuator and method of manufacturing thereof
TWI268179B (en) * 2005-04-12 2006-12-11 Ind Tech Res Inst Improved structure of atomizing nozzle the plate can be vibrated by the vibrator element to compress the fluid, so that the fluid is jet from the perforations in form of tiny particle
CN101111098B (en) * 2007-08-31 2011-09-21 陕西师范大学 Sandwich type radial direction vibrating piezoelectric ceramic ultrasonic transducer
DE102010029283A1 (en) * 2010-05-25 2011-12-01 Robert Bosch Gmbh Ultrasonic transducer for use in a fluid medium
CN102179361B (en) * 2011-01-04 2013-02-27 瑞声声学科技(深圳)有限公司 Method for manufacturing ultrasonic transducer
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EP0451306B1 (en) 1997-07-16
US5457353A (en) 1995-10-10
ATE155601T1 (en) 1997-08-15
JPH04227399A (en) 1992-08-17
DE59010738D1 (en) 1997-08-21

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