AN APPARATUS FOR DETECTING A COMPONENT IN A SAMPLE
First Claim
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1. An apparatus for detecting a component in a sample comprising, a first component being responsive to at least radiation of a first wavelength, the sample comprising the first component and a second component responsive to at least radiation of a second wavelength, the apparatus comprising;
- at least one radiation source configured to direct radiation towards the sample;
at least one radiation detector configured to detect radiation of at least the first and the second wavelength, said detected radiation having propagated along a radiation path through at least a portion of the sample; and
a processing unit operable to receive at least one detector signal from the at least one radiation detector indicative of the detected radiation, and todetermine an estimated path length of the radiation path at least from a determined absorbance by the sample of radiation at the second wavelength;
determine an estimated concentration of the first component at least from a determined absorbance by the sample of radiation at the first wavelength and from the estimated path length;
determine a corrected concentration of the first component at least from the estimated concentration and from a correction term indicative of a corrected path length corrected for a presence of the first component using the estimated concentration.
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Abstract
An apparatus for detecting a first component in a sample, the first component being responsive to at least radiation of a first wavelength, the sample comprising the first component and a second component responsive to at least radiation of a second wavelength.
8 Citations
34 Claims
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1. An apparatus for detecting a component in a sample comprising, a first component being responsive to at least radiation of a first wavelength, the sample comprising the first component and a second component responsive to at least radiation of a second wavelength, the apparatus comprising;
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at least one radiation source configured to direct radiation towards the sample; at least one radiation detector configured to detect radiation of at least the first and the second wavelength, said detected radiation having propagated along a radiation path through at least a portion of the sample; and a processing unit operable to receive at least one detector signal from the at least one radiation detector indicative of the detected radiation, and to determine an estimated path length of the radiation path at least from a determined absorbance by the sample of radiation at the second wavelength; determine an estimated concentration of the first component at least from a determined absorbance by the sample of radiation at the first wavelength and from the estimated path length; determine a corrected concentration of the first component at least from the estimated concentration and from a correction term indicative of a corrected path length corrected for a presence of the first component using the estimated concentration. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A method for determining a concentration of a component in a sample comprising, a first component being responsive to at least radiation of a first wavelength, the sample comprising the first component and a second component responsive to at least radiation of a second wavelength, the method comprising:
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receiving a measured first absorbance of the sample at at least the first wavelength and a measured second absorbance of the sample at at least the second wavelength; determining, at least from the second absorbance, an estimated path length of a radiation path along which the radiation has propagated through the sample; determining an estimated concentration of the first component at least from the first absorbance and from the estimated path length; determining a corrected concentration of the first component at least from the estimated concentration and from a correction term indicative of a corrected path length corrected for a presence of the first component using the estimated concentration. - View Dependent Claims (12, 13, 14, 15, 27, 28, 29, 30, 31, 32, 33, 34)
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16. A method for determining a path length of a radiation path along which radiation has propagated through a sample comprising:
the sample comprising a first component responsive to radiation at at least a first wavelength, and a second component responsive to radiation at at least a second wavelength, the method comprising; receiving a measured first absorbance of the sample at at least the first wavelength, and a measured second absorbance of the sample at at least the second wavelength; determining, at least from the second absorbance, an estimated path length of a radiation path along which the radiation has propagated through the sample; determining an estimated concentration of the first component at least from the first absorbance and from the estimated path length; correcting the estimated path length for a presence of the first component using the estimated concentration of the first component. - View Dependent Claims (17, 18, 19, 20, 21, 22, 23, 24, 25, 26)
Specification