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A novel smart interface for voltage-generating sensors

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3 Author(s)
Xiujun Li ; Fac. of Electr. Eng., Delft Univ. of Technol., Netherlands ; Meijer, G.C.M. ; Schnitger, E.J.

A novel low-cost smart interface for self-generating sensors, e.g., thermopiles and thermocouples, is presented. The proposed interface acts as an asynchronous converter for dc voltages employing a relaxation oscillator which output a period-modulated signal. A microcontroller is used to measure the output signal from the interface, to process data, and to output the measured sensor signal. The system provides an intrinsic A/D converter. Experimental results show that the interface is able to measure voltages in the range of 0 V to 5 V with an accuracy and resolution of ±64×10-6 and 20×10-6, respectively. The measurement time is less than 100 ms

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Instrumentation and Measurement, IEEE Transactions on  (Volume:47 ,  Issue: 1 )