Infrared analyzer and method
First Claim
1. THE METHOD FOR DETERMINING THE PERCENTAGE OF A FLUID HETEROATOMIC COMPOUND IN A SAMPLE CONTAINING INTERFERING FLUIDS WHICH COMPRISES PASSING TWO OPTICALLY BALANCED BEAMS OF INFRARED RADIATION FROM A SOURCE OF RADIATION THROUGH THE SAMPLE TO BE ANALYZED, PASSING ONLY ONE OF THE BEAMS THROUGH SPECIMENS OF THE HETEROATOMIC COMPOUND, WHICH IS PRESENT IN AN AMOUNT SUFFICIENT TO FILTER FROM THE BEAM MOST OF THE RADIATION IN THE ABSORPTION BANDS CHARACTERISTIC OF THE COMPOUND, AND OF A MATERIAL HAVING AT LEAST ONE ABSORPTION BAND WHICH OVERLAPS ON ABSORPTION BAND OF A NEGATIVE INTERFERING FLUID PRESENT IN THE SAMPLE, THE MATERIAL BEING PRESENT IN AN AMOUNT WHICH SUBSTANTIALLY REDUCES INTERFERENCE BY THE NEGATIVELY INTERFERING FLUID, PASSING THE OTHER BEAM THROUGH A MATERIAL HAVING AT LEAST ONE ABSORPTION BAND WHICH OVERLAPS AN ABSORPTION BAND OF A POSITIVELY INTERFERING FLUID PRESENT IN THE SAMPLE AND WHICH DOES NOT OVERLAP AN ABSORPTION BAND OF THE HETEROATOMIC COMPOUND, THE MATERIAL BEING PRESENT IN AN AMOUNT WHICH SUBSTANTIALLY REDUCES INTERFERENCE BY THE POSITIVELY INTERFERING FLUID, MEASURING THE DIFFERENCE BETWEEN THE OVERALL RADIANT ENERGIES OF THE TWO BEAMS AFTER PASSAGE THROUGH THE SAMPLE AND SPECIMENS, AND DETERMINING THE PERCENTAGE OF HETEROATOMIC COMPOUND BY COMPARING THE MEASURED ENERGY DIFFERENCE WITH A CALIBRATION AGAINST SAMPLES CONTAINING KNOWN PERCENTAGES OF THE HETEROATOMIC COMPOUND.
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1 Claim
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1. THE METHOD FOR DETERMINING THE PERCENTAGE OF A FLUID HETEROATOMIC COMPOUND IN A SAMPLE CONTAINING INTERFERING FLUIDS WHICH COMPRISES PASSING TWO OPTICALLY BALANCED BEAMS OF INFRARED RADIATION FROM A SOURCE OF RADIATION THROUGH THE SAMPLE TO BE ANALYZED, PASSING ONLY ONE OF THE BEAMS THROUGH SPECIMENS OF THE HETEROATOMIC COMPOUND, WHICH IS PRESENT IN AN AMOUNT SUFFICIENT TO FILTER FROM THE BEAM MOST OF THE RADIATION IN THE ABSORPTION BANDS CHARACTERISTIC OF THE COMPOUND, AND OF A MATERIAL HAVING AT LEAST ONE ABSORPTION BAND WHICH OVERLAPS ON ABSORPTION BAND OF A NEGATIVE INTERFERING FLUID PRESENT IN THE SAMPLE, THE MATERIAL BEING PRESENT IN AN AMOUNT WHICH SUBSTANTIALLY REDUCES INTERFERENCE BY THE NEGATIVELY INTERFERING FLUID, PASSING THE OTHER BEAM THROUGH A MATERIAL HAVING AT LEAST ONE ABSORPTION BAND WHICH OVERLAPS AN ABSORPTION BAND OF A POSITIVELY INTERFERING FLUID PRESENT IN THE SAMPLE AND WHICH DOES NOT OVERLAP AN ABSORPTION BAND OF THE HETEROATOMIC COMPOUND, THE MATERIAL BEING PRESENT IN AN AMOUNT WHICH SUBSTANTIALLY REDUCES INTERFERENCE BY THE POSITIVELY INTERFERING FLUID, MEASURING THE DIFFERENCE BETWEEN THE OVERALL RADIANT ENERGIES OF THE TWO BEAMS AFTER PASSAGE THROUGH THE SAMPLE AND SPECIMENS, AND DETERMINING THE PERCENTAGE OF HETEROATOMIC COMPOUND BY COMPARING THE MEASURED ENERGY DIFFERENCE WITH A CALIBRATION AGAINST SAMPLES CONTAINING KNOWN PERCENTAGES OF THE HETEROATOMIC COMPOUND.
Specification
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Current AssigneeDenwood Friel Daniel, Gaines Jackson Richard
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Original AssigneeDenwood Friel Daniel, Gaines Jackson Richard
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InventorsDENWOOD FRIEL DANIEL, GAINES JACKSON RICHARD
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Application NumberUS03/038,906Time in Patent Office2,658 DaysField of SearchUS Class Current250/346CPC Class CodesG01N 21/3504 for analysing gases, e.g. m...
