Optics: measuring and testing – For light transmission or absorption – Of fluent material
Patent
1985-10-23
1988-04-19
Laroche, Eugene R.
Optics: measuring and testing
For light transmission or absorption
Of fluent material
73657, G01N 2100
Patent
active
047385367
ABSTRACT:
A method for analyzing impurities in liquid and an apparatus therefor are disclosed, which are adapted to classify impurities contained in various liquids to be measured into soluble substance, insoluble substance and impurities in the form of bubbles and to measure their concentration separately; especially the impurities in liquid are analyzed by the method such that photoacoustic signals obtained by irradiating a liquid to be measured with intensity-modulated light are measured; the correlation between the modulation frequency of the intensity-modulated light (light modulation frequency) and the phase of the intensity-modulated light, with which the liquid to be measured is irradiated, as well as that of their photoacoustic signals are obtained; and impurities in the liquid to be measured are detected, while classifying them into soluble and insoluble ones and those in the form of bubbles on the basis of the information thus obtained; and the apparatus comprises a light source, at least one light modulator for transforming light from the light source into intensity-modulated light having a given constant frequency, at least one cell disposed at a position, where it is irradiated with the intensity-modulated light, and containing liquid to be measured, at least one phase detection device for detecting the phase of the photoacoustic signals coming from the cell, a calculating device for analyzing impurities in the liquid on the basis of this phase detection device, and a control device for controlling the modulation frequency (light modulation frequency) of the intensity-modulated light in the light modulator.
REFERENCES:
patent: 4581939 (1986-04-01), Takahashi
"Laser Induced Photoacoustic Spectroscopy of Some Rare Earth Ions in Aqueous Solutions", Analytical Chemistry, vol. 51, pp. 688-690, May 1979.
"Simultaneous Determination of Mixtures in Liquid by Laser-Induced Photoacoustic Spectroscopy", Analytical Chemistry, vol. 51, pp. 686-688, May 1979.
"Analysis of Turbid Solutions by Laser-Induced Photoacoustic Spectroscopy", Analytical Chemistry, vol. 52, pp. 650-653, 1980.
"Photoacoustic Effect as a Liquid Absorbance Detector", Applied Optics, vol. 19, No. 18, Sep. 15, 1980.
Kawasaki Satoru
Kitamori Takehiko
Kondo Masahiro
Uchida Shunsuke
Hitachi , Ltd.
LaRoche Eugene R.
Pascal Robert J.
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