G - Physics – 01 – N
Patent
G - Physics
01
N
73/59
G01N 21/00 (2006.01) G01N 21/53 (2006.01)
Patent
CA 1039079
ABSTRACT This invention relates to improvements in measuring the concentration of suspended substances in a liquid, said substances consisting of components of different geometrical size. The liquid is flowing in a pipe and is illumi- nated transverse to its flow direction by one or more light sources. A de- tecting means is arranged to detect light spread by the suspended substances in the liquid in another direction than that of the illuminating incident ra- diation. This detecting means delivers two electrical signals, the first of which represents a D.C. level measured during a predetermined time and cor- responding to a detected level of luminous intensity. The second signal re- presents the number of times during the same said predetermined time that the detected level of luminous intensity has exceeded a definite discriminator level, the equation of the first signal is Ug = cPF + dFF and the equation of the second signal is UF = aPF + bFF, where a, b, c and d are constants, of which b is substantially less than a, c and d, and PF represents the concentra- tion of suspended material in excess of a certain definite geometrical size and FF the concentration of suspended material below the same size. The sig- nals from the detecting means are fed to an evaluation means to develop an output signal, which is representative of the sum S = PF + FF of the total con- centration of substances of the flowing liquid, said substances being suspend- ed during the predetermined time, or, as an alternative, that the evaluation means also develops output signals, which are representative of the concentra- tion of PF and FF separately.
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Eriksson Lennart
Fladda Gerdt
Hill Jan
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