ANALISA SIFAT FISIS SENSOR KOIL DATAR DENGAN VARIASI GEOMETRI

R. Roberto, L. Umar, R. N. Setiadi

Abstract


Flat coil inductive sensors based on Eddy currents principal could work without direct
mechanical contact on the object, it could work continuously and reactively to the
conductive material. This system is easily influenced by external disturbances. Based on
inductance value due to changes in magnetic force lines that occurs between the sensor
and conductor material (disturbances material). The system could be used as a detection
of distance translation. The used sensors in this study was a flat coil made of Printed
Circuit Board (PCB) technology with various geometric shapes, such as circle, square,
rectangle and octagonal. Distance detection analysis were evaluated using a LC
oscillator which was directly connected to a computer that able to transform a massive
range measurement into frequencies. Characteristics of distance detection was
influenced by geometry of the flat coil sensors with its highest value of frequency of
1.68 MHz for a circular shape, 1.66 MHz for an octagonal shape, 1.52 MHz for an
square shape, 1.42 MHz for an rectangular shape, respectively with the minimum
distances as far as 5 mm for each shape. The temperature tested as external disturbances
caused change in characteristics of the transfer curve based on drift frequency for
distance detection analysis based on a mathematical formula.

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