Simultaneous measurement of the size and the electromagnetic property of a double-layered spherical sample

Basic theoretical analyses to detect undesirable foreign metal pieces in the meat being processed have already been carried out. In this study, taking the low conductivity of meat into account, a double-layered spherical sample structure which enables easy analyses was selected. In order to detect these conductive materials, analyses of the difference in the impedance of a circular coil with, and another one without a double-layered spherical conductor were made. In this way, a new formula for obtaining the electromagnetic properties of a double-layered spherical sample was derived. The process of deriving the new formula is explained. The calculated value was compared with the experimental value. Their values had a close correlation