G - Physics – 01 – N
Patent
G - Physics
01
N
73/58
G01N 21/53 (2006.01) G01N 21/85 (2006.01) G01N 33/34 (2006.01) G01N 21/21 (2006.01) G01N 21/33 (2006.01)
Patent
CA 1322866
ABSTRACT The invention relates to a method and apparatus for deter- mining the concentration of a substance which is bonded to particles in a flowing medium, where said substance can be present in varying concentrations, a light beam (IO) being transmitted in the medium and light (Ir) directly reflected from the particles being detected for obtaining a signal which is proportional to the intensity of the reflected light, said signal being used as a measure of the concentration of the substance conditional on particle concentration and opticle properties of the particles being kept constant. Detection is carried out wihtout light passing straight through the medium, by the particle concentration of the sample taken being selected sufficiently great so that the quantity of directly re- flected light will be maximum. Apart from a first detector (1) for transmitting a light beam and for detecting light directly reflected from the particles for obtaining a first signal, the apparatus includes a second transducer (12) adapted to provide a signal (C) which is combinable with the first signal (Ir) and which represents the concen- tration and optical properties of the particles. (Fig. 1 for publication with the Abstract)
591986
Damlin Sven-Arne
Falt Lars-Erik
Valheim Svein
Btg Kalle Inventing Ab
Fetherstonhaugh & Co.
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