| 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 I<uo>u is the intensity of incident radiation, I<ur>u 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, c<u1>u, c<u2>u, c<u3>u are constants. |
