Method and device for simultaneous determination of concentrations of molecular compounds in gases and liquids

摘要

The device permits simultaneous measurement of the concentrations or radiation absorptions of multicomponent mixtures with the aid of just one radiation detector positioned behind the measuring cell, accommpanied by high measurement accuracy, long-term stability and low cost. In order to achieve the object of the invention the method proposed is to transmit through the medium radiation having different wavelengths at different chopping rates, and to separate the molecule-specific signals generated on the radiation detector by means of narrowband amplifiers having different mid-frequencies. The device is configured in such a way that downstream of the radiation source (40) there is a chopper system (53) consisting of stationary subsystems (42,56,57) and moving subsystems (41,54,55), and that the radiation components (62,63) are separated and processed further by narrowband amplifiers (48,49). IMAGE