Optical Absorption Spectrometer and Method for Measuring Concentration of a Substance
First Claim
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1. An optical absorption spectrometer for determining the concentration:
- of a substance within a sample, comprising;
a first radiation source for supplying radiation to the sample to be measured;
at least one cavity for containing the sample during measurement;
a detector assembly for simultaneously detecting radiation transmitted along first and second optical paths through the sample, the length of the first optical path within the sample being greater than that of the second optical path within the sample, whereby the radiation detector receives the sum of the radiation transmitted along each of the first and second optical paths, and outputs a radiation signal corresponding thereto; and
a processor adapted to generate a measurement of the concentration of the substance in the sample from the radiation signal output by the detector.
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Abstract
An optical absorption spectrometer is provided for determining the concentration of a substance within a sample. The optical absorption spectrometer comprises a first radiation source for supplying radiation to the sample to be measured; at least one cavity for containing the sample during measurement; and a detector assembly for detecting radiation transmitted along first and second optical paths through the sample, the length of the first optical path being greater than that of the second optical path.
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Citations
21 Claims
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1. An optical absorption spectrometer for determining the concentration:
- of a substance within a sample, comprising;
a first radiation source for supplying radiation to the sample to be measured; at least one cavity for containing the sample during measurement; a detector assembly for simultaneously detecting radiation transmitted along first and second optical paths through the sample, the length of the first optical path within the sample being greater than that of the second optical path within the sample, whereby the radiation detector receives the sum of the radiation transmitted along each of the first and second optical paths, and outputs a radiation signal corresponding thereto; and a processor adapted to generate a measurement of the concentration of the substance in the sample from the radiation signal output by the detector. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 19, 20, 21)
- of a substance within a sample, comprising;
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18. A method of determining the concentration of a substance within a sample, comprising:
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transmitting radiation through the sample to be measured along a first optical path and a second optical path, the length of the first optical path within the sample being greater than that of the second optical path within the sample; filtering the radiation transmitted through the sample using a filter having a number of pass bands at wavelengths corresponding to absorption peaks in the absorption spectrum of the substance to be detected, the filter being responsive to an applied signal to modulate the wavelengths of the pass bands; simultaneously detecting the sum of the filtered radiation on each of the first and second optical paths to determine the difference in its maximum and minimum intensities to thereby determine the concentration of the substance in the sample.
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Specification