Method and apparatus for determining the concentration of a subs

Details Method and apparatus for determining the concentration of a subs Method and apparatus for determining the concentration of a subs

1989-02-24

1990-11-20

Willis, Davis L.

Optics: measuring and testing

By particle light scattering

With photocell detection

356246, G01N 2153

Patent

active

049714414

ABSTRACT:
The invention relates to a method and apparatus for determining 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 (I.sub.0) being transmitted in the medium and light (I.sub.r) 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 without light passing straight through the medium, by the particle concentration of the sample taken being selected sufficiently great so that the quantity of directly reflected 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 (I.sub.r) and which represents the concentration and optical properties of the particles.

REFERENCES:
patent: 4078863 (1978-03-01), Eriksson et al.

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