Avl List Gmbh

Robert Hauser

Leonhard Michael Reindl

Alexander Friedl

Andreas Stelzer

Klaus Leitmeier

Gudrun Bruckner

Stefan Scheiblhofer

Robert Strmsek

Stefan Schuster

A measuring sensor comprises at least one SAW (surface acoustic wave) element () serving as a sensor and identification unit, which is installed in a contactless manner inside a housing part () forming, in essence, a coaxial conductor. The housing part () is connected to the shield () of the connection cable whose signal conductor () extends in a contactless manner over a superficial coupling structure of the SAW element () without contact. In order to improve the near-field coupling, the coupling structure of the SAW element () comprises additively coupling partial structures, which are arranged on both sides of the signal conductor () and which, preferably with at least one strip conductor, encircle, at least for the most part, the SAW element () in the peripheral area, and which serve as an integrated discharge loop for pyroelectric charges.

Measuring sensor with at least one SAW (surface acoustic wave) element

A plurality of exchangeable, different piezoelectric pressure sensors () comprise integrated SAW elements () as identification units whose identification data can be read by an interrogation unit () via a common connection cable (). The analysis unit () for the measurement signals and the interrogation unit () for the identification data can be connected by a common coupling unit () to the connection cable (). The coupling unit () has a coupling capacity () which connects with high frequency the interrogation unit () to the signal line of the connection cable (), as well as a coupling inductance () which connects with low frequency the load amplifier () of the analysis unit () to the connection cable (), thus neatly separating the useful signal from the identification signal and keeping a high-impedance measurement chain from the sensor () to the input of the load amplifier (). An SFSCW radar can further be used to improve interrogation of the identification data.

Measurement system for measuring cylinder pressure in an internal combustion engine

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Bodensdorf, Austria

Robert Hauser