A method for obtaining dependence mathematical models from graphics in chemical sensors

In this paper, we try to solve a problem attached to the electronic design. When working with sensors, environmental conditions such as temperature and relative humidity must be taken into account because they affect the behaviour of the sensor, and the deviations must be corrected. Often the sensor manufacturers not provide clearly this information. In many cases only is provided a graph of the variability of the sensor according to physical parameters. So the designer has to find their own method of compensation. In this work is presented a simple procedure for obtaining mathematical models which relates the variation of the sensor (in this case resistive) with physical parameters to be corrected. The procedure could be extrapolated to any system in which one have to obtain a mathematical model from a graph. A high degree of resolution has been achieved considering information provided by the manufacturer, in the particular case of electrochemical sensors.