The invention discloses a
carbon dioxide gas analyzer and an
analysis method thereof. The optical probe of the analyzer adopts a spatial double-
optical path structure which is composed of a single
light source, a single
gas chamber and double detectors. The
analysis method comprises the following steps: firstly, the values of the
voltage at the two ends of the main
detector and the reference
detector in the optical probe are measured when the
light source is turned off , then the values of the
voltage at the two ends of the main
detector and the reference detector are measured when the
light source is turned on and after the
infrared light emitted from the light source passes through the
gas chamber, after the treatment of error
elimination, by using the Lambert-Beer's Law as the theoretical basis and by combining with the working mechanism of a spatial double-
optical path optical structure, the measurement model of the analyzer is established and calibrated, therefore, the
gas concentration of
carbon dioxide can be directly calculated and output by the analyzer through the measurement value. The
carbon dioxide gas analyzer has the advantages of small volume, light weight, low
power consumption, high reliability and high measurement accuracy.