Sensors, Vol. 23, Pages 7322: Low-Pass Filters for a Temperature Drift Correction Method for Electromagnetic Induction Systems

Sensors, Vol. 23, Pages 7322: Low-Pass Filters for a Temperature Drift Correction Method for Electromagnetic Induction Systems Sensors doi: 10.3390/s23177322 Authors: Martial Tazifor Tchantcho Egon Zimmermann Johan Alexander Huisman Markus Dick Achim Mester Stefan van Waasen Electromagnetic induction (EMI) systems are used for mapping the soil’s electrical conductivity in near-surface applications. EMI measurements are commonly affected by time-varying external environmental factors, with temperature fluctuations being a big contributing factor. This makes it challenging to obtain stable and reliable data from EMI measurements. To mitigate these temperature drift effects, it is customary to perform a temperature drift calibration of the instrument in a temperature-controlled environment. This involves recording the apparent electrical conductivity (ECa) values at specific temperatures to obtain a look-up table that can subsequently be used for static ECa drift correction. However, static drift correction does not account for the delayed thermal variations of the system components, which affects the accuracy of drift correction. Here, a drift correction approach is presented that accounts for delayed thermal variations of EMI system components using two low-pass filters (LPF). Scenarios with uniform and non-uniform temperature distributions in the measurement device are both considered. The approach is developed using a total of 15 measurements ...
Source: Sensors - Category: Biotechnology Authors: Tags: Article Source Type: research