Browsing by Author "Gooneratne, Chinthaka P"

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    Planar electromagnetic sensors : characterization and experimental results : a project report submitted in partial fulfilment of the requirements for the degree of Master of Engineering in Information and Telecommunications Engineering
    (Massey University, 2005) Gooneratne, Chinthaka P
    Planar type electromagnetic sensors have simple structures and are very useful for the inspection of material properties, in a non-destructive and non-invasive way. The operating principle of the sensing technique is based on the interaction of electromagnetic fields with the materials under test. Three types of planar sensors: meander, mesh and interdigital configuration have been analyzed to determine their characteristics. Finite element software has been used for the analysis of flux distribution for all three types of sensors. The nature of the impedance characteristics has also been obtained through experiments. It has been reported that meander and mesh type sensors respond well at moderately high frequencies. To avoid relatively costly instrumentation systems at high frequencies, interdigital sensors having good response at low frequencies have been considered. The response of all the sensors, especially the interdigital types to milk of varying fat content, quality estimation of saxophone reeds and non-invasive estimation of fat content of pork belly cuts have been determined. The different types of sensors can be made as a sensor array, to estimate the properties of mixtures of electric, magnetic and dielectric materials. A microcontroller based low cost sensing system is under development.