Patent ID: 8352206

Claim:
Method for the signal linearization of a gas sensor output signal in a device consisting of a computational unit, an ultrasonic molar mass sensor in combination with a gas sensor for a specific gas component where the linearity, defined as the input to output response characteristic, of the gas sensor is determined using two reference gases (Ref#1 and Ref#2) that have differing molar mass values and contain differing gas concentrations at the low end and at the high end of the measurement range of the gas sensor, including the following steps: measuring the output value of the molar mass sensor and the output of the gas sensor at least at three gas mixture values of the two reference gases (Ref#1 and Ref#2) to generate measured data points associated with said gas mixture values; computing by the computational unit the percentage by which the reference gases (Ref#1 and Ref#2) are mixed based on the output of the molar mass sensor; determining by the computational unit a linearization curve based on the relation between the computed percentage by which the reference gases (Ref#1 and Ref#2) are mixed and the measured data points of the gas sensor output; and determining by the computational unit an effective linearization curve of the gas sensor by interpolation or regression between the measured data points of the linearization curve.