Infrared gas analyzer and method

摘要

An infrared gas analyzer and method employs an optical path (16) which includes one infrared source (12), one sample cell (18) containing the gas(es) to be analyzed, one infrared sensor (14) and one infrared filter (24) no matter how many gases are to analyzed. This optical path (16) with its one wideband filter (24) is utilized for both determining infrared source output and infrared absorption by the gas(es) to be measured. For this purpose at least two reference cells containing known quantities of the gas(es) of interest are disposed one at a time in the optical path (16) and the energy readings obtained by the sensor (14) enable the concentration(s) of the gas(es) of interest to be calculated. <IMAGE>