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Because of their robustness, eddy current sensors are widely used in harsh environments. For the extraction of measurement quantities such as distances or material properties, a proper understanding of the magnetic filed distribution and of the impedance of the sensor is required. Thereby the calculation of the absolute impedance of eddy current sensors is still a difficult problem, because many analytical...
The aim of the paper is to assess the feasibility of impedance measurements for meat aging detection. The carried investigations are dedicated to the aging of the meat of beef. An investigation was carried out for the detection of the age of meat using 2 cases of storage in the fridge, unpacked meat, exposed in the air of the fridge (Up) and vacuum-packed meat, conserved in closed box (Vp). The measurements...
This paper presents an estimation of the per-unit-length parameters of a lossy cable. A RLGC lumped element model for the lossy transmission line parameters of a coaxial cable including frequency dependent filtering effect is used in this study to evaluate reflectometry responses of the cable systems. The simulated results of this model are compared with the measured results of a coaxial cable using...
As a new application of thermal impedance modeling the thermal behavior of a glow plug is examined. The self-heating device is basically a temperature dependent resistance, which is directly exposed to the highly dynamic combustion process. Therefore it can be used as a sensor in the combustion chamber for diagnosis reasons. In order to deduce the temperature changes in the gas chamber the dynamic...
The more effects and mechanisms are represented in an impedance spectrum, the more unknown parameters are needed for accurate modeling. The inverse identification problem corresponding to this parameter extraction process becomes thereby more difficult to solve and needs generally a lot of a priori knowledge and trials. The use of evolutionary strategies (EV) can significantly contribute to increase...
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