Method of and an apparatus for measuring a concentration of a fluid
OwnerYukio Nakanoinventor
Life of this patent
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Abstract
A method of determining a concentration CM of a component in a sample by measuring a light transmissivity TM of the sample. First, light transmissivities T.sub.C1 and T.sub.C2 of a first standard and a second standard respectively having known concentrations C1 and C2 of the component is measured. Then a correction factor K3 is calculated according to the following three equations: L.sub.C1 =log((T.sub.C1 -K3)/(1-K3) (1) L.sub.C2 =log((T.sub.C2 -K3)/(1-K3) (2) L.sub.C1 /L.sub.2 =C1/C2 (3) The concentration CM of the sample is calculated according to either of the following equations: CM=((log((TM-K3)/(1-K3))/L.sub.C1).multidot.C1 (4) CM=((log((TM-K3)/(1-K3))/L.sub.C2).multidot.C2 (5)
Claims8
A method of determining a concentration of a component in a sample by measuring absorbed ratio or transmitting ratio of light passing through the sample, the method comprising the steps of:
- a) measuring light transmissivities and T.sub.C1 and T.sub.C2 of a first standard and a second standard respectively having known concentrations C1 and C2 of the component;
- b) calculating a correction factor K3 according to the following equations;
- L.sub.C1 =log((T.sub.C1 -K3)/(1-K3)) (1)
- L.sub.C2 =log((T.sub.C2 -K3)/(1-K3)) (2)
- L .sub.C1 /L.sub.C2 =C1/C2 (3)
- c) measuring a light transmissivity TM of the sample having an unknown concentration CM;
- and
- d) determining the unknown concentration CM according to either of the following equations:
- CM=((log((TM-K3)/(1-K3))/L.sub.C1 .multidot.C1 (4)
- CM=((log((TM-K3)/(1-K3))/L.sub.C2 .multidot.C1 (5).
A method of determining a concentration of a component in a sample by measuring absorbed ratio or transmitting ratio of light passing through the sample, the method comprising the steps of:
- ab) measuring light transmissivities T.sub.C1, T.sub.C2 and T.sub.C3 of a first standard, a second standard and a third standard respectively having known concentrations C1, C2 and C3 of the component;
- bb) calculating a correction factor K3b, K4 and K5 according to the following equations;
- C2/C1=(((1-T.sub.C2)/(1-T.sub.C1)).sup.K3b).multidot.K4+((1-T.sub.C3)/(1-T. sub.C1)).multidot.K5 (1b)
- C3/C1=(((1-T.sub.C3)/(1-T.sub.C1)).sup.K3b).multidot.K4+((1-T.sub.C3)/(1-T. sub.C1)).multidot.K5 (2b)
- K4+K5=1 (3b)
- cb) measuring a light transmissivity TM of the sample having an unknown concentration CM;
- and
- db) determining the unknown concentration CM according to the following equation:
- CM+((((1-TM)/(1-T.sub.C1))).sup.K3b).multidot.K4+((1-TM)/(1-T.sub.C1)).mult idot.K5).multidot.C1 (4b).
An apparatus for determining a concentration of a component in a sample comprising:
- a) a sample cell for containing the sample;
- b) a light source;
- c) means for measuring a light transmissivity of the sample or standards in the sample;
- d) means for calculating a correction factor K3 according to the following equations:
- L.sub.C1 =log((T.sub.C1 -K3)/(1-K3)) (1)
- L.sub.C2 =log((T.sub.C2 -K3)/(1-K3)) (2)
- L.sub.C1 /L.sub.C2 =C1/C2 (3)
- where T.sub.C1 AND T.sub.C2 are light transmissivities of a first standard and a second standard respectively having known concentrations C1 and C2 of the component;
- e) means for determining the concentration CM of the component in the sample according to either of the following equations:
- CM=((log((TM-K3)/(1-K3))/L.sub.C1).multidot.C1 (4)
- CM=((log((TM-K3)/(1-K3) /L.sub.C2).multidot.C1 (5)
- where TM is a light transmissivity of the sample.
An apparatus for determining a concentration of a component in a sample comprising:
- a) a sample cell for containing the sample;
- b ) a light source;
- c) means for measuring a light transmissivity of the sample or standards in the sample cell;
- d) means for calculating correction factors K3b, K4 and K5 according to the following equations:
- C2/C1=(((1-T.sub.C2)/(1-T.sub.C1)).sup.K3b).multidot.K4+((1-T.sub.C2)/(1-T. sub.C1)).multidot.K5 (1b)
- C3/C1=(((1-T.sub.C3)/(1-T.sub.C1)).sup.K3b).multidot.K4+((1-T.sub.C3)/(1-T. sub.C1)).multidot.K5 (2b)
- K4+K5=1 (3b)
- where T.sub.C1, T.sub.C2 and T.sub.C3 are light transmissivities of a first standard, a second standard and a third standard respectively having known concentrations C1, C2 and C3 of the component;
- e) means for determining the concentration CM of the component in the sample according to the following equation:
- CM+((((1-TM)/(1-T.sub.C1)).sup.K3b).multidot.K4+((1-TM)/(1-T.sub.C1)).multi dot.K5).multidot.C1 (4b)
- where TM is a light transmissivity of the sample.
Dependencies are inferred from the claim text.