Method of analyzing liquid samples and system for continuously automatically analyzing same
First Claim
1. A method of analyzing a liquid sample comprising the steps of applying the sample to a composite test medium formed of a strip having thereon a reflectivity reference piece and at least one color reaction test piece feeding the test medium to spectral reflectivity measuring means, irradiating each of the pieces with energy of a plurality of predetermined different wavelengths, and obtaining corrected reflectivities of each of the test pieces as the relative values with respect to the reflectivity of said reflectivity reference piece from the amounts of reflected energy at at least some of the different wavelengths to measure the concentration of an abnormal substance contained in the test sample.
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Abstract
A method of analyzing a liquid sample by applying the sample to a composite test paper composed of a strip plastic transparent film and a reflectivity reference or compensation paper piece and a plurality of color reaction test paper pieces affixed to the strip, feeding the test paper to a spectral reflectivity measuring device a predetermined period of time after the application, and calculating the corrected reflectivities of each of the paper pieces from the measured amounts of reflected light at varying wavelengths to determine the concentration of the abnormal substance contained in the test sample, free of measuring errors due to the color if any of the sample, differences in the color developed and variations in the thickness of the color reaction test paper pieces and reflectivity reference or compensation paper piece. A system for practicing this method is also disclosed.
68 Citations
16 Claims
- 1. A method of analyzing a liquid sample comprising the steps of applying the sample to a composite test medium formed of a strip having thereon a reflectivity reference piece and at least one color reaction test piece feeding the test medium to spectral reflectivity measuring means, irradiating each of the pieces with energy of a plurality of predetermined different wavelengths, and obtaining corrected reflectivities of each of the test pieces as the relative values with respect to the reflectivity of said reflectivity reference piece from the amounts of reflected energy at at least some of the different wavelengths to measure the concentration of an abnormal substance contained in the test sample.
- 4. A system for continuously automatically analyzing liquid samples comprising a sample holder for successively receiving sheets of composite test media in a first position, means for intermittently moving said sample holder, reflectivity measuring means, wavelength selector means disposed adjacent the sample holder for directing energy of several predetermined and different wavelengths through said reflectivity measuring means to irradiate the test media with the energy of selected wavelengths, scanning means disposed adjacent the sample holder and operative while the holder is stopped for moving a test media relative to said selector means, detector means for receiving the output of said reflectivity measuring means, energy transmitted through said test media and energy produced by said wavelength selector means, and a data processing means operative in response to signals from said detector means for determining the reflectivity of the test media.
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9. A method of analyzing a liquid sample comprising the steps of:
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applying the sample to at least one color reaction test piece, irradiating the test piece with sample applied thereto to a plurality of predetermined different wavelengths of energy, and measuring the spectral reflectance of the energy reflected from the test piece at each of said predetermined different wavelengths. - View Dependent Claims (10, 11, 12)
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13. A system for analyzing for different substances in a liquid sample which has been applied to a test piece comprising:
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means for irradiating the test piece with light energy of a plurality of different, predetermined wavelengths, means for measuring the reflectance of the light from the test piece of at least a selected plurality of the different wavelengths, and means responsive to the measured values of reflected light for analyzing for the substance. - View Dependent Claims (14, 15, 16)
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Specification