Enhanced Accuracy of CMOS Smart Temperature Sensors by Nonlinear Curvature Correction

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Abstract

In this paper, we demonstrate an improvement in the accuracy of a low-cost smart temperature sensor, by measurement of the nonlinear curvature correction at multiple temperature references. The sensors were positioned inside a climate chamber and connected outside to a micro-controller via a network cable. The chamber temperature was increased systematically over a wide range from -20 °C to 55 °C. A set of calibration curves was produced from the best fitting second-order polynomial curves for the offset in temperature between the sensor and reference. An improvement in accuracy of ±0.15 °C is with respect to the mentioned temperature range, compared to the significantly higher value reported of ±0.5 °C by the manufacturer for similar conditions. In summary, we demonstrate a significant improvement in the calibration of a low-cost, smart sensor frequently used in research and academic projects over a useful range of temperatures.

Original languageEnglish
JournalSensors (Switzerland)
Volume18
Issue number12
DOIs
Publication statusPublished - 22 Nov 2018

Keywords

  • calibration
  • characterization
  • curvature correction
  • smart sensors
  • temperature sensor

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