Radiant energy – Photocells; circuits and apparatus – Optical or pre-photocell system
Patent
1990-06-19
1991-11-26
Nelms, David C.
Radiant energy
Photocells; circuits and apparatus
Optical or pre-photocell system
356128, G01N 1506
Patent
active
050685422
ABSTRACT:
A concentration measuring method and an apparatus measures the concentration of an objective solvent in a mixed solution by flowing a mixed solution through a tube, transmitting light through the mixed solution as it flows through the tubing and measuring the quantity of light transmitted through the fluid. The concentration of the objective solvent in the mixed solution is measured on the basis of either the quantity of light transmitted, the diameter of a light beam received, or a point of convergence of the light transmitted through the mixed solution. These factors being dependent on the concentration of the objective solvent in the mixed solution.
REFERENCES:
patent: 3950104 (1976-04-01), Munk
patent: 4135100 (1979-01-01), Harada et al.
patent: 4886366 (1989-12-01), Kogure
patent: 4967187 (1990-10-01), Dumas et al.
Ando Minato
Aoki Hideyasu
Kato Takashi
Kurokawa Akemi
Mizushima Yasuyuki
Le Que T.
Nelms David C.
NGK Spark Plug Company, Ltd.
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