Optics: measuring and testing – For light transmission or absorption – By comparison
Patent
1995-11-27
1997-02-11
Gonzalez, Frank
Optics: measuring and testing
For light transmission or absorption
By comparison
356436, 356440, 356246, G01N 2100
Patent
active
056026471
ABSTRACT:
An apparatus and method for optically measuring concentrations of components allow enhancement in measurement accuracy of concentration. The apparatus includes a cell, a light irradiator, a photodetector, and an arithmetic unit. The cell presents different optical path lengths at different locations and is to contain a sample therein. The light irradiator, which includes a variable-wavelength laser generator and a measuring system composed of convex lenses, outputs a collimated, enlarged laser beam, and makes the laser beam incident upon the cell. The photodetector comprises a multiplicity of photodetectors arranged in parallel to the surface of the cell, so that it can detect intensity of rays of transmitted light that have traveled over different optical path lengths at positions of an equal distance from the cell. The arithmetic unit, receiving a signal from the individual photodetectors, calculates concentrations of components in the sample based on optimum optical path lengths for different wavelengths and values of transmitted light at positions of the optimum optical path lengths, and further outputs calculation results.
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Sakura Takeshi
Uenoyama Harumi
Xu Kexin
Yamasaki Yutaka
Eisenberg Jason D.
Gonzalez Frank
Kyoto Dai-ichi Kagaku Co. Ltd.
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