Device for photometrically measuring the concentration of a...

Details Device for photometrically measuring the concentration of a... Device for photometrically measuring the concentration of a...

2008-05-13

2008-05-13

Lauchman, Layla G. (Department: 2877)

Optics: measuring and testing

For light transmission or absorption

Of fluent material

C356S244000, C356S433000, C356S338000, C422S082050, C422S082090

Reexamination Certificate

active

07372572

ABSTRACT:
An apparatus for photometric measurement of the concentration of a chemical substance in a solution, wherein a cuvette is provided containing the solution The cuvette is transmissive at least in predetermined regions for electromagnetic radiation, wherein a transmitting unit is provided, which produces electromagnetic radiation in at least two wavelength regions and which radiates into the cuvette The electromagnetic radiation in a first wavelength region serves for measurement purposes and the electromagnetic radiation in a second wavelength region is used for reference purposes The electromagnetic radiation in the two wavelength regions takes the same path through the cuvette and through the solution At least one detector unit is provided, which is so arranged that it receives the electromagnetic radiation in the at least two wavelength regions following passage through the solution, and wherein a control/evaluation unit is provided, which determines the concentration of at least one chemical substance in the solution on the basis of the electromagnetic radiation detected in the two wavelength regions.

REFERENCES:
patent: 5272345 (1993-12-01), Durham et al.
patent: 6046804 (2000-04-01), Kawamura et al.
patent: 25 53 565 (1977-06-01), None
patent: 26 35 171 (1978-02-01), None
patent: 31 49 869 (1983-06-01), None
patent: 35 10 052 (1986-09-01), None
patent: 100 20 615 (2001-11-01), None

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