A3.4 - Measuring Flow Velocity and Gas Concentration in Binary Gas Mixtures Using Thermal Sensors

Ch. Hepp, F. Krogmann, J. Polak, M. Lehmann, G. Urban & G. Urban
An enhanced thermal flow sensor is under development at IST AG in cooperation with IMTEK (Freiburg) measuring simultaneous thermal gas properties and flow velocity. Simultaneous measurement of thermal gas properties and flow velocity is necessary for gas mixtures where gas concentration is fluctuating by time, enabling a more accurate flow speed measurement. This is achieved by using an AC signal as excitation and analyzing phase shift and amplitude of the returned signal. Here, the AC...