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Vol. 6, Special Issue, August 2009, pp.105-116





Experimental Evaluation of the Applicability of Capacitive and Optical Measurement Methods

for the Determination of Liquid Hydrogen Volume Flow


1Gert HOLLER, 1Daniel HRACH, 2Anton FUCHS

1Graz University of Technology,
Institute of Electrical Measurement and Measurement Signal Processing,
Kopernikusgasse 24, A-8010 Graz, Austria

2Kompetenzzentrum – Das Virtuelle Fahrzeug Forschungsgesellschaft

Inffeldgasse 21a, A-8010 Graz, Austria

E-mail: gert.holler@tugraz.at



Received: 10 July 2009   /Accepted: 31 July 2009   /Published: 10 August 2009


Abstract: This paper presents a capacitive and a vision-based method for measuring the velocity of cryogenic hydrogen flows. The capacitive sensing principle exploits the spatial frequency signature of perturbations moving through a multi-electrode structure. This setup increases the sensitivity to dielectric permittivity variations compared to a simple two-electrode structure while preserving the ability to detect small perturbations. The vision-based method relies on a high-speed camera system that monitors the liquid hydrogen flow through an optical window yielding the flow velocity by cross-correlating subsequent images of the flow. Although a comprehensive analysis of the obtainable measurement uncertainty was not performed yet, current measurement results show the applicability of both principles for the non-invasive measurement of the volume flow of cryogenic fuels inside conveyor pipes.


Keywords: Flow velocity measurement, Cryogenic media, Capacitive sensing, Optical sensing, Non-invasive measurement


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