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The Design of 2 MHz Air Backed Ultrasonic Transducers with Temperature Independent Response

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The performance of 2 MHz air backed ultrasonic transducers operating in the pulse-echo mode in water is investigated at selected temperatures in the range from 20 °C to 100 °C. At higher temperatures a drastic change of the received electrical signal amplitude can be seen. The properties of some plastic materials and bonding epoxy are studied with dynamical mechanical analysis. Simple calculations based on transmission line theory explain fairly well the transducer behaviour at higher temperatures. To reduce the influence of temperature, a transducer design with an acoustic matching layer made of glass is proposed as well as bonding with a temperature resistant epoxy resin originally developed for bonding purposes in the field of fibre optics.

Zusammenfassung

Es wird die Funktion von 2-MHz-Ultraschallwandlern mit rückseitigem Luftabschluß bei Pulsechobetrieb in Wasser und bei ausgewählten Temperaturen im Bereich von 20 °C bis 100 °C untersucht. Bei höheren Temperaturen zeigt sich eine drastische Änderung der empfangenen elektrischen Signalamplitude. Zur Klärung werden die Eigenschaften einiger plastischer Materialien und Bindemitteln mit einer dynamisch-mechanischen Methode untersucht. Einfache Berechnungen auf der Grundlage der Leitungstheorie erklären das Verhalten der Wandler bei höheren Temperaturen recht gut. Um den Einfluß der Temperatur zu vermindern, wird ein Wandleraufbau mit einer akustischen Anpassungsschicht aus Glas vorgeschlagen sowie Verbindungen aus einem temperaturbeständigen Epoxydharz, das ursprünglich für Verbindungen im Bereich der Glasfaseroptik entwickelt worden ist.

Sommaire

L'etude porte sur les performances de transducteurs ultrasonores à 2 MHz, dont la face arrière est au contact de l'air, fonctionnant sous l'eau en mode émetteur-récepteur, pour diverses températures allant de 20 °C a 100 °C. Aux températures élevées on observe un changement radical du signal électrique de réception. On étudie les propriétés de quelques matériaux plastiques et du collage à l'époxyde à l'aide de l'Analyse Mécanique Dynamique. Des calculs simples, bases sur la theorie des lignes de transmission, permettent une assez bonne interpretation du comportement des transducteurs aux temperatures elevees. Pour reduire l'influence de la temperature, on propose d'equiper les transducteurs d'une couche d'adaptation acoustique en verre, ainsi qu'un collage a la resine epoxyde resistant a la temperature, comme cela s'est fait originellement dans le domaine des fibres optiques.
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Document Type: Research Article

Publication date: March 1, 1992

More about this publication?
  • Acta Acustica united with Acustica, published together with the European Acoustics Association (EAA), is an international, peer-reviewed journal on acoustics. It publishes original articles on all subjects in the field of acoustics, such as general linear acoustics, nonlinear acoustics, macrosonics, flow acoustics, atmospheric sound, underwater sound, ultrasonics, physical acoustics, structural acoustics, noise control, active control, environmental noise, building acoustics, room acoustics, acoustic materials, acoustic signal processing, computational and numerical acoustics, hearing, audiology and psychoacoustics, speech, musical acoustics, electroacoustics, auditory quality of systems. It reports on original scientific research in acoustics and on engineering applications. The journal considers scientific papers, technical and applied papers, book reviews, short communications, doctoral thesis abstracts, etc. In irregular intervals also special issues and review articles are published.
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