Abstracts : Eurosensors IV, held jointly with Sensoren, Technologie und Anwendung : October 1-3, 1990, Karlsruhe, Federal Republic of Germany / orginized by Informationstechnische Gesellschaft im VDE (ITG), VDI/VDE-Gesellschaft Meß- und Automatisierungstechnik (GMA), in co-operation with the German Section of the Institute of the Institute of Electrical and Electronics Engineers (IEEE) ; Conference Chairman K. H. Härdtl (University of Karlsruhe, F. R. Germany)