Abstract
This article proposes a novel technique for independent measurement of strain and temperature in piezoresistive strain sensors configured in a tee-rosette. The most notable property of piezoresistive sensors is their easy integration into MEMS fabrication processes and nanopositioning systems which makes them highly advantageous for both size and cost. The foremost disadvantage associated with piezoresistive sensors is high temperature sensitivity. The proposed estimator allows independent estimation of strain and temperature, which eliminates drift due to temperature variation. Experimental results are presented for motion sensing of a piezoelectric stack actuator which shows a strain measurement with a mean absolute error of 2.16% over a temperature range of −15° $C$ to 40°C.
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