Amplitude and phase measurement of a flow sensor at high frequency

Abstract

A flow sensor is being developed at IMTEK to simultaneously measure gas flow and its thermal properties. In this contribution, we show that at high frequency the amplitude and phase shift of the temperature oscillations remain constant for an air flow speed ranged from 0 to 3 m/s. Since amplitude and phase shift strongly depend on the gas properties, and flow can be extracted from the DC component of the temperature, then it is in principle possible to measure both simultaneously. © 2012 The Authors. Published by Elsevier Ltd.