Method and system for gas concentration measurement of gas dissolved in liquids

摘要

The present invention concerns a method and system for gas concentration measurement of gas or gas mixtures dissolved in liquids. A gas or gas mixture dissolved in a liquid sample is extracted from the liquid sample using an extraction system and conducted into a measurement chamber. Then a measurement signal is generated by means of a radiant source and the measurement signal is directed to a measurement object in a measurement chamber containing the gas or gas mixture to be measured. The measurement signal is filtered using at least two wavelengths, whereupon the filtering is preferably implemented by means of an electrically tunable, short-resonator Fabry-Perot interferometer. Then the filtered measurement signals are detected my means of a detector.

主权项

1. A method for gas concentration measurement, the method comprising
extracting a gas or gas mixture dissolved in a liquid sample using an extraction system and conducted into a measurement chamber, generating a measurement signal by means of a radiant source, directing the measurement signal to a measurement object in the measurement chamber containing the gas or gas mixture to be measured, modifying the measurement signal by a filter or a wavelength dispersive element in order to enable the observation of the wavelength dependence of the signal intensity, and detecting the modified signal by means of a detector or a detector matrix, wherein the signal intensity as a function of the wavelength is measured at at least two wavelengths at a first pressure, the pressure is varied to a second pressure, and the signal intensity as a function of the wavelength is measured at at least two wavelengths at the second pressure.