Long-Term Performance of Ultrasonic Transducers Used for Energy and Data Transmission

Conference: Smart Systems Integration 2008 - 2nd European Conference & Exhibition on Integration Issues of Miniaturized Systems - MOMS, MOEMS, ICS and Electronic Components
04/09/2008 - 04/10/2008 at Barcelona, Spain

Proceedings: Smart Systems Integration 2008

Pages: 6Language: englishTyp: PDF

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Ngo, Luong van; Seidel, Helmut; Schmid, Ulrich (Saarland University, Chair of Micromechanics, Microfluidics/Microactuators, D-66123 Saarbrucken, Germany)
Kluge, Martin; Sabater, Jordi; Schalk, Josef (EADS Innovation Works, Department TCC4 – Sensors, Electronics and Systems Integration, D-81663 Munich, Germany)

In this work, we present experimental results on the long-term performance of ultrasonic transducers elements. For aeronautic applications these devices are targeted for the wireless transmission of energy and data to and from sensor elements placed inside of hermetically sealed metal envelopes, typically used e.g. for hydraulic accumulators, oxygen bottles, fuel tanks etc. By exciting the transmitter piezo in resonance, acoustic waves are generated traveling through the metallic body and are reconverted to electrical energy on the receiving side. Commercially available cylindrically shaped piezoelectric elements have been selected in order to build up an energy and data transmission system. In a test arrangement for preevaluation purposes both piezoelectric elements are arranged on opposite sides of a metal wall, fixed by using an electrically conductive epoxy and exposed to ambient temperatures up to of 100 °C. Furthermore, a concept is presented how to integrate the complete system in a compact way in a hydraulic accumulator.