Method and apparatus for measuring concentration of a solution u

Details Method and apparatus for measuring concentration of a solution u Method and apparatus for measuring concentration of a solution u

1993-09-07

1995-02-07

Pham, Hoa Q.

Optics: measuring and testing

Sample, specimen, or standard holder or support

Fluid containers

356436, 356440, 250344, 250576, G01N 110, G01J 100

Patent

active

053879716

ABSTRACT:
Method and apparatus for measuring concentration of a solution use pathlength complementarily modulated cells comprising a sample cell and a reference cell arranged in parallel to each other and separated by a displacable separator window which is displaced parallelly in a direction of an optical axis of a measuring optical system thereby varying each of cell-length of sample and reference cells complementarily, detect transmitted intensities by the combined cells at different positions of the separator window while flowing a sample solution and a reference solution having a known concentration into the sample cell and reference cell, respectively, and calculate the concentration of the sample solution based on detected transmitted intensities, positions of the separator window at which transmitted intensities are detected and the known concentration of the reference solution.

REFERENCES:
patent: 2761067 (1956-08-01), Troy
patent: 3679899 (1972-07-01), Dimeff
patent: 3843269 (1974-10-01), Hohberg
patent: 3899252 (1975-08-01), Dimeff
patent: 4027972 (1977-06-01), Davies
patent: 4937448 (1990-06-01), Mantz et al.
patent: 4981362 (1991-01-01), deJong et al.
Frant et al., "Process Infrared Measurements," Analytical Chemistry, vol. 52, No. 12, Oct. 1980, pp. 1331A-1345A.

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