Sensor Array Calibration by a Single Reference in Presence of Measurand Non-linear Gradient

A calibration method exploiting a single external reference is proposed for sensors arrays in presence of a measurand non-linear gradient in the system under test. The calibration artifacts due to a non-uniform distribution of the measurand in the system under test, not detected by the single punctual reference sensor, are avoided. A proof-of-principle demonstration is carried out within the case study of a thermistors array obtaining compatible result with respect to a standard method which requires a reference sensor for each element of the sensor array. Thus, the complexity (and cost) of standard calbration setups is reduced by using a single reference sensor without sacrifying significantly the calibration accuracy.