Optics: measuring and testing – Of light reflection – With diffusion
Reexamination Certificate
1999-06-17
2001-03-27
Font, Frank G. (Department: 2877)
Optics: measuring and testing
Of light reflection
With diffusion
Reexamination Certificate
active
06208423
ABSTRACT:
FIELD OF THE INVENTION
The invention relates to an arrangement at measurement of pH or another chemical property detectable by dye indicators, the arrangement comprising a glass sheet or a similar substrate to be immersed into a solution to be measured, the substrate being coated with a dye film arranged to change its colour when a chemical property of the environment changes, and means for leading light through the substrate to the dye film.
BACKGROUND OF THE INVENTION
At measurement of pH in solutions, strips made of litmus paper, for instance, are generally used, the strips being immersed into a solution to be measured, whereby the paper changes its colour in accordance with the environment, i.e. the pH value of the solution.
In principle, the above procedure functions at least in some situations, for instance in laboratory conditions. However, a problem is the difficulty and slowness of the measurement. In addition, the procedure is inconvenient for example in certain industrial conditions. Another drawback of the above technique is its one-time nature. At present, glass membrane sensors based on electrochemical phenomena are mainly used for pH measurement in the industry.
SUMMARY OF THE INVENTION
The object of the invention is to provide an arrangement, by means of which the drawbacks of the prior art technique can be eliminated. This has been achieved by means of the invention. The arrangement of the invention is characterized in that the dye film is covered with a structure, comprising at least one layer, allowing ions to pass through and reflecting light backwards, whereby a colour change in the dye film can be measured as light reflection measurement.
The main advantage of the invention is its simplicity, which makes the introduction and use of the invention advantageous. Another advantage of the invention is that the measurement can be automated in an advantageous manner and, additionally, the measurement can preferably be performed directly in a process pipe as well.
REFERENCES:
patent: 3992158 (1976-11-01), Przybylowicz et al.
patent: 4649123 (1987-03-01), Charlton et al.
patent: 5039491 (1991-08-01), Saaski et al.
patent: 5268145 (1993-12-01), Namba et al.
patent: 5608519 (1997-03-01), Gourley et al.
Voipio Ville
Vuokila Katri
Burns Doane Swecker & Mathis L.L.P.
Font Frank G.
Janesko Oy
Stafira Michael P.
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