Patent ID: 6526801
Filing Date: 2003-03-04
Classification: G01N

Abstract:
A method of compensating for drift of a gas sensor, comprising:(a) providing a processor with gas concentration data relating to a first period of time; (b) identifying a quiescent period, the quiescent period being a subset of the first period of time, the gas concentration data including quiescent period data relating to the quiescent period; (c) determining a first component concentration wherein the quiescent period has a duration, and if the duration is less than a minimum duration, the first component concentration is omitted from the valid concentration set; (d) providing the processor with a least one additional component concentration, each additional component concentration corresponding to a separate and distinct time period, wherein the first component concentration and the additional component concentrations provide an initial concentration set; (e) selecting, by the processor, at least one valid concentration from the initial concentration set to yield a valid concentration set; (f) providing the processor with a preset background value; (g) calculating, by the processor, an estimated background value; and (h) calculating, by the processor, a correction value comprising a function of the preset background value and the estimated background value.