AN ALGORITHM OF POSITION CORRECTION USING LINEAR INTERPOLATION FOR TWO-DIMENSIONAL MAGNETIC TRACKING
In this work, a two-dimensional (2D) position detection device using a tunnel-magnetoresistance (TMR) sensor combined with orthogonal gradient coils was designed and fabricated. The field profile generated by the two coils were analyzed numerically to achieve the maximum linear range, which corresponds to the detection area of the device. The two coils were driven by 1-kHz sine wave currents with 90° phase difference to generate the fields with uniform gradients along the x- axis and y- axis of the plane. The gradient fields are detected by a single axis TMR sensor followed by a digital dual phase lockin detector to retrieve the position information. A linearity correction algorithm was used to improve the accuracy and to extend the linear range of position sensing. The proposed tracking technique is promising in applications of two-dimensional position control.
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