Patent ID: 9453765
Filing Date: 2016-09-27
CPC Classification: G01J,G01N

Claim Text:
1. A method for measuring concentration of a gas component in a measurement gas based on two measurement methods comprising direct absorption spectroscopy and wavelength modulation spectroscopy, comprising: varying a wavelength of light of a tunable light source periodically over an absorption line of interest for the gas component; additionally sinusoidally modulating a wavelength of the light of the tunable light source at a high frequency and with a small amplitude in cases of wavelength modulation spectroscopy; and detecting an intensity of the light after transradiation of the measurement gas and processing the light to yield a measurement result, the two measurement methods being applied simultaneously during each period, or alternately in consecutive periods, and their results being combined by averaging to form the measurement result; wherein results of the two measurement methods are weighted differently in the averaging; and wherein the results of the two measurement methods are weighted aided by a ratio of their measuring accuracies.