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A novel low-cost noncontact resistive potentiometric sensor for the measurement of low speeds

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2 Author(s)
Xiujun Li ; Fac. of Inf. & Technol. & Syst., Delft Univ. of Technol., Netherlands ; Meijer, G.C.M.

A novel low-cost sensor system for the measurement of low angular or linear speed is presented. The sensing element consists of a noncontact resistive potentiometer. The applied sliding electrode does not make mechanical contact with the resistive layer. The processing circuit consists of a very linear oscillator which converts the position quantity to a period-modulated signal. This signal can be directly read out by a microcontroller. A novel algorithm is presented which can eliminate or strongly reduce the influence of the many nonidealities, and which results in a short measurement time. The resolution of the low-cost angular speed sensor system is about 8×10-2 r/min in a measurement time of only 80 ms. The angular range is limited by the potentiometer geometry and the finite size of the sliding electrode, and typically amounts to about 270°. The sensor system also indicates the moving direction

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Instrumentation and Measurement, IEEE Transactions on  (Volume:47 ,  Issue: 3 )