Implementation of a novel digital temperature compensation method, developed for piezoresistive pressure sensors, to the field of capacitive sensors is presented. Possibilities for the compensation of sensor parameters such as sensor nonlinearity and temperature sensitivity are analyzed. In order to achieve effective compensation and linearization, different approaches to digital descriptions of sensor characteristic are investigated and reported, such as two-dimensional rational polynomial description and Chisholm approximants. Results of sensor response are compared against reference pressure source and most effective digital temperature compensation is proposed.
COBISS.SI-ID: 11768859
Concept and realization of testing and calibration system of wireless network modules is presented. Calibrator device self calibration algorithm is described. During initial calibration a simplification in sensor characteristic evaluation algorithm resulted in calibration error up to 10 mmHg, primarily in its midrange − around 0 mmHg. This calibration error magnitude was lowered by insertion of additional calibration points, which resulted in minimal number of calibration segments and final sensor simulator error of 0.02%. Described testing and calibration system was implemented in HYB d.o.o.
COBISS.SI-ID: 8653140
Adaptive calibration and quality control are presented. During initial calibration stage early detection of faulty sensors has proven essential for calibration system yield improvement. Yield enhancement was achieved by thorough specification of sensor related failure causes. Further refinement of calibration failure causes gives a detailed insight into sensor related failures by thorough evaluation of essential sensor properties such as nonlinearity, offset and sensitivity. Described quality control mechanisms enable automatic sensor classification. Proposed calibration system shortens the total time for calibration of smart sensors by implementing the input testing of the sensor parameters as well as final testing of the calibrated sensors. Final testing was achieved by inserting excess test points into the calibration scenario. In its maximal extension, which offers calibration of 2048 sensors at a time, the calibration time was reduced to 3 seconds per sensor – in its current configuration, the total calibration time is 42 seconds per sensor.
COBISS.SI-ID: 8431956