Method and Device for Measuring the Concentration of Substances in Gaseous Or Fluid Media Through Optical Spectroscopy Using Broadband Light Sources
The invention relates to a method and to a device for using partially non-stabilized broadband light sources to accurately measure partially broadband-absorbing substances using referencing measuring cells. In order to create a low-cost, high-resolution, and at the same time fast spectrographic device for measuring concentrations of substances in fluid or gaseous media that is also suitable for harsh environments, the light radiated by the broadband light sources (1) through light guiding optical systems is fed through the measuring section of the self-referencing measuring cell (20, 30, 40) or only partially through a measuring cell (10) to a measurement detector (photoreceptor 11) and partially through a reference path (optical waveguide 8) to a reference detector (photoreceptor 15), and a mode coupler (5, 9, 14) is associated with each optical waveguide (2, 4, 7, 8); in order to homogenize the radiation characteristic of the broadband light sources (1), which varies over time and space.
DEGNER MARTIN [DE]; EWALD HARTMUT [DE]; DAMASCHKE NILS [DE]; LEWIS ELFRED [IE]
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