Krauter Nico, Stefani Frank
Helmholtz-Zentrum Dresden-Rossendorf, Bautzner Landstraße 400, 01328 Dresden, Germany.
Sensors (Basel). 2023 Nov 7;23(22):9018. doi: 10.3390/s23229018.
The Eddy Current Flow Meter (ECFM) is a commonly employed inductive sensor for assessing the local flow rate or flow velocity of liquid metals with temperatures up to 700 ∘C. One limitation of the ECFM lies in its dependency on the magnetic Reynolds number for measured voltage signals. These signals are influenced not only by the flow velocity but also by the electrical conductivity of the liquid metal. In scenarios where temperature fluctuations are significant, leading to corresponding variations in electrical conductivity, it becomes imperative to calibrate the ECFM while concurrently monitoring temperature to discern the respective impacts of flow velocity and electrical conductivity on the acquired signals. This paper introduces a novel approach that enables the concurrent measurement of electrical conductivity and flow velocity, even in the absence of precise knowledge of the liquid metal's conductivity or temperature. This method employs a Look-Up-Table methodology. The feasibility of this measurement technique is substantiated through numerical simulations and further validated through experiments conducted on the liquid metal alloy GaInSn at room temperature.
涡电流流量计（ECFM）是一种常用的电感式传感器，用于评估温度高达700℃的液态金属的局部流速或流动速度。ECFM的一个局限性在于其测量电压信号对磁雷诺数的依赖性。这些信号不仅受流速影响，还受液态金属电导率的影响。在温度波动显著导致电导率相应变化的情况下，必须在监测温度的同时校准ECFM，以辨别流速和电导率对采集信号的各自影响。本文介绍了一种新颖的方法，即使在对液态金属的电导率或温度缺乏精确了解的情况下，也能同时测量电导率和流速。该方法采用查找表方法。通过数值模拟证实了这种测量技术的可行性，并通过在室温下对液态金属合金GaInSn进行的实验进一步验证。
