Patent ID: 9410886
Filing Date: 2016-08-09
CPC Classification: G01J,G01N

Claim Text:
1. A method of operating an optical absorption gas sensor for detecting an analyte gas, the sensor comprising a gas sample receiving chamber, at least one light emitting diode (LED) and a photosensor having an output signal sensitive to the amount of light received by the photosensor, the method comprising: generating a plurality of pulses of light by passing a plurality of pulses of current through the at least one LED, and measuring the current through the at least one LED a plurality of times during each said pulse of light to thereby measure information concerning the shape of the light pulse, and generating a compensated signal indicative of the concentration of an analyte gas in the gas sample receiving chamber taking into account both the photosensor output signal and the measured information concerning the shape of the light pulse.