Multisensorik fuer Mehrphasenstroemungen in Verfahrenstechnik, Verschleiss-und Korrosionsschutztechnik Schlussbericht

A multisensor system consisting of several different electrochemical sensors can give more complex information with regard to the investigation and supervision of corrosion systems. Partial problems consisted in the miniaturization of sensors, their application to examination of crevice corrosion effects and to single phase flows as well as in the collection of the sensor signals. Another goal were the construction and putting into operation of a flow circuit and a Laser-Doppler-velocimeter in order to investigate miniaturized sensors in flow. The combination of different sensors enables to eliminate cross sensitivities of single sensors. In this way the signal of a flow velocity sensor working on the principle of electrochemical oxygen reduction can be corrected by means of the signal of a simultaneously used membrane-covered oxygen sensor. The suitability of the impedance spectrometry for measurements of polarization resistance and conductivity has been tested. In order to adapt sensors to pipe flows a transmitter armature has been developed. Furthermore, special signal transmitters have been designed and produced for the conversion of high resistance electrode potentials and of small diffusion limit currents into resistance voltages. (orig.)Available from TIB Hannover: F94B1402 / FIZ - Fachinformationszzentrum Karlsruhe / TIB - Technische InformationsbibliothekSIGLEBundesministerium fuer Forschung und Technologie (BMFT), Bonn (Germany)DEGerman