Measuring system for measuring absorption or scattering at different wavelengths

摘要

A measuring system for measuring absorption or scattering of a medium at a plurality of different wavelengths, whereby the measurements for the different wavelengths are performable as simultaneously and as accurately as possible. The measuring system comprises: a measuring chamber; a transmitting unit, which sends light of its respective wavelength into the measuring chamber; a control, which operates each light source with a different time modulation of transmission intensity for each wavelength; a detector for measuring a total radiation intensity. The total radiation intensity corresponds to a superpositioning of each intensity portion striking the detector for each wavelength; and a signal processing system, which determines for each of the wavelengths the associated intensity portion based on the total radiation intensity measured by detector and the modulations.

主权项

1. A measuring system for measuring absorption or scattering of a medium at a plurality of different wavelengths, comprising:
a measuring chamber for accommodating the medium; a transmitting unit, which has, for each wavelength, an electrically controllable light source, which sends light of its respective wavelength into said measuring chamber in measurement operation; a control, which operates each light source with a different time modulation of the transmission intensity for each wavelength, wherein the different modulations for the individual wavelengths have time curves such that, on average, an at least approximately constant number of light sources simultaneously send light into said measuring chamber in measurement operation at any given time; a detector for measuring a total radiation intensity dependent on the modulations and the absorption or the scattering in the medium and emerging from said measuring chamber at the site of said detector, the total radiation intensity corresponds to a superpositioning of each intensity portion striking said detector for each wavelength; and a signal processing system, which determines for each wavelength the associated intensity portion based on the total radiation intensity measured by said detector and the modulations.