Method and device for analysis with color identification...

G - Physics – 01 – J

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G01J 3/46 (2006.01) G01N 21/47 (2006.01)

Patent

CA 1127865

ABSTRACT OF THE DISCLOSURE The technique used to remove the influence of the inner stray rays in the interior of the measuring instrument and that used to eliminate the instrumental error arising from the scattering of the wave length in measuring the calibration curve of the reflectivity versus the concentration when the concentration of the analyte in the liquid to be examined is intended to be found by measuring the reflectivity of the color identification test paper painted with or impregnated in the liquid to be examined, is disclosed, wherein a periodic flux of light is used for measuring the reflectivity, the difference between the output signal at the time of the irradiation and the output signal at the time of non-irradiation constitutes the difference output signal. The quantity of inner stray rays output signal at the time of the measurement is calculated from the proportion of the inner stray rays output signal to the quantity of standard difference output signal both stored in advance and the quantity of standard difference output signal at the time of the correction prior to the measurement, whereby the correction is added to the quantities of both standard and measured difference output signals, thus the influence of the quantity of inner stray rays output signal being eliminated. The calibration curve is approximated while being regarded as a part of a hyperbola. The difference and fluctuation of the calibration curve attributable to the scattering and change of the measuring wave length is corrected by adjusting the constants in the equation for conversion as the approximate equation.

320030

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