A numerical method of correcting the influence of the additional quantities for nonselective sensors
Henryk Urzedniczok
Abstract:
At present the modern sensors, based on the microelectronic, optoelectronic and bio-electronic technologies, are widely applied in various measuring systems. However, these sensors have often one essential disadvantage - wrong properties in metrological sense, mainly due to the poor selectivity and high sensitivity to the impact of the additional physical quantities. To apply such sensors in measuring transducers, for example in gas concentration transducers, effective methods of correction of these quantities influence are required. An effective numerical method based on model with variable coefficients is described in this paper. An example of using this method for the simultaneous correction of influences both temperature and humidity for a gas concentration measuring transducer with Figaro TGS2442 carbon monoxide sensor is given. Dispersion of measurement results due to the influence of these quantities, changing in a fairly wide range, is reduced about 11 times, from 64% to 6 % of range.
Keywords:
gas sensor, nonselective sensor, transfer function, correction method
