FORFARANDE OCH ANORDNING FOR ATT BESTEMMA KONCENTRATIONEN AV ETT EMNE BUNDET TILL PARTIKLAR BURNA AV ETT STROMMANDE MEDIUM

摘要

Method and device for determining the concentration of a substance, which is bound to particles in a flowing medium (1), which substance can prevail in varying concentration. The determination is carried out by light beams (2) so selected, that the substance is absorbent for the radiation within a certain wavelength range, while the remainder of the particle material is reflecting. By means of a detector (4) the radiation is determined which passes straight through the flowing medium, and by means of a detector (5) the radiation is determined which is scattered in a certain direction by the particles in the medium. The concentration is calculated from the equation (FORMULA) where Iu is the intensity of incident radiation, Iu is the intensity of radiation which has passed straight through the medium, Is is the intensity of detected scattered radiation, k is a constant between 1/2 and 1 depending on the detection angle for the scattered radiation, and A, cu, cu, cu are constants.