ANALYSIS OF IMPEDANCE CHARACTERISTICS OF MEANDER COIL

We have developed a meander coil type linear sensor. When a detection coil is moved on a scale coil, mutual inductance fluctuates according to the displacement, causing the impedance change of detection coil. T herefore, displacement can be detected by using this impedance change. Impedance becomes like a sine wave form and impedance variation incre ases by resonating the coil, compared with the case when the coil is n ot resonating. When the width of the detection coil and scale coil are 0.5 and 0.6 mm respectively, impedance variation has its maximum of 3 8.6 Ohm.