Patent ID: 9709487
Date: 2017-07-18
CPC Classifications: G01J,G01N

Claim:
1. A method for measuring the concentration of a gas component in a measuring gas by a gas analyzer, the method comprising: varying an absorption line of the gas component as a function of the wavelength of the light of a wavelength-tunable light source within a periodically sequential scanning interval; modulating the absorption line of the gas component with a frequency (f guiding the modulated light through the measuring gas onto a detector; demodulating a measurement signal generated by the detector upon determining a harmonic (nf producing a measurement result by fitting a setpoint curve to the profile of the demodulated measurement signal; wherein both the demodulated measurement signal and the setpoint curve are filtered with the aid of the same filter function, the filter function being operative to suppress noise signal components of the demodulated measurement signal that disturb both signal components of the demodulated measurement signal and the setpoint curve.