Gas analyzer system
First Claim
1. A method comprising:
- generating an optical signal;
at each of multiple frequency bands, measuring an intensity of the optical signal after passage of the optical signal through a sample gas having multiple types of gases that absorb the optical signal in a same frequency band; and
detecting concentrations of the multiple types of gases in the sample gas based on absorption of the optical signal at the multiple frequency bands;
wherein detecting concentrations of the multiple types of gases in the sample gas includes;
utilizing absorbance measurements of the optical signal at a first frequency band and a second frequency band to calculate a concentration of a first gas present in the sample gas; and
utilizing absorbance measurements of the optical signal at the first frequency band and the second frequency band to calculate a concentration of a second gas present in the sample gas.
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Accused Products
Abstract
A gas analyzer system includes an optical source, an optical filter assembly, a controller, and an analyzer. The optical source generates an optical signal. The optical filter assembly includes different optical filters in which to filter the optical signal. During operation, the controller selects sequential application of each of the different optical filters in a path of the optical signal to modulate the optical signal using different frequency bands of optical energy. The modulated optical signal passes through an unknown sample. Based on absorption of the optical signal by the sample gas at different frequencies, the optical analyzer detects which types of multiple different gases are present in the sample.
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Citations
22 Claims
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1. A method comprising:
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generating an optical signal; at each of multiple frequency bands, measuring an intensity of the optical signal after passage of the optical signal through a sample gas having multiple types of gases that absorb the optical signal in a same frequency band; and detecting concentrations of the multiple types of gases in the sample gas based on absorption of the optical signal at the multiple frequency bands; wherein detecting concentrations of the multiple types of gases in the sample gas includes; utilizing absorbance measurements of the optical signal at a first frequency band and a second frequency band to calculate a concentration of a first gas present in the sample gas; and utilizing absorbance measurements of the optical signal at the first frequency band and the second frequency band to calculate a concentration of a second gas present in the sample gas. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. A method comprising:
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generating an optical signal; at each of multiple frequency bands, measuring an intensity of the optical signal after passage of the optical signal through a sample gas having multiple types of gases that absorb the optical signal in a same frequency band; detecting concentrations of the multiple types of gases in the sample gas based on absorption of the optical signal at the multiple frequency bands; and wherein measuring the intensity of the optical signal at each of multiple frequency bands includes; measuring an intensity of the optical signal in a first frequency band, the first frequency band including optical energy at a wavelength around 2.5 micrometers; measuring an intensity of the optical signal in a second frequency band, the second frequency band including optical energy at a wavelength around 4.6 micrometers; measuring an intensity of the optical signal in a third frequency band, the third frequency band including optical energy at a wavelength around 4.8 micrometers; measuring an intensity of the optical signal in a fourth frequency band, the fourth frequency band including optical energy at a wavelength around 5.2 micrometers; measuring an intensity of the optical signal in a fifth frequency band, the fifth frequency band including optical energy at a wavelength around 6.2 micrometers; and measuring an intensity of the optical signal in a sixth frequency band, the sixth frequency band including optical energy at a wavelength around 3.2 micrometers.
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13. A method comprising:
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generating an optical signal; at each of multiple frequency bands, measuring an intensity of the optical signal after passage of the optical signal through a sample gas having multiple types of gases that absorb the optical signal in a same frequency band; and detecting concentrations of the multiple types of gases in the sample gas based on absorption of the optical signal at the multiple frequency bands; wherein measuring the intensity of the optical signal at each of multiple frequency bands includes; measuring an intensity of the optical signal in a first frequency band to detect a concentration of water in the sample gas, the first frequency band including optical energy at a wavelength around 2.5 micrometers; measuring an intensity of the optical signal in a second frequency band to detect a concentration of carbon monoxide in the sample gas, the second frequency band including optical energy at a wavelength around 4.6 micrometers; measuring an intensity of the optical signal in a third frequency band to detect a concentration of carbon dioxide in the sample gas, the third frequency band including optical energy at a wavelength around 4.8 micrometers; measuring an intensity of the optical signal in a fourth frequency band to detect a concentration of nitric oxide in the sample gas, the fourth frequency band including optical energy at a wavelength around 5.2 micrometers; measuring an intensity of the optical signal in a fifth frequency band to detect a concentration of nitrogen oxide in the sample gas, the fifth frequency band including optical energy at a wavelength around 6.2 micrometers; and measuring an intensity of the optical signal in a sixth frequency band to detect a concentration of methane in the sample gas, the sixth frequency band including optical energy at a wavelength around 3.2 micrometers.
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14. A system comprising:
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an optical source to generate an optical signal; a detector to measure an intensity of the optical signal after passing of the optical signal through a sample gas; and an analyzer to detect which of multiple gases are present in the sample gas based on measuring absorbance of the optical signal by the sample gas at different optical frequency bands, at least two gases of the multiple gases absorbing the optical signal in a same frequency band; wherein the analyzer is configured to; utilize absorbance measurements of the optical signal at a first frequency band and a second frequency band to calculate a concentration of a first gas present in the sample gas; and utilize absorbance measurements of the optical signal at the first frequency band and a third frequency band to calculate a concentration of a second gas present in the sample gas. - View Dependent Claims (15, 16, 17, 18, 19, 20)
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21. A system comprising:
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an optical source to generate an optical signal; a detector to measure an intensity of the optical signal after passing of the optical signal through a sample gas; and an analyzer to detect which of multiple gases are present in the sample gas based on measuring absorbance of the optical signal by the sample gas at different optical frequency bands, at least two gases of the multiple gases absorbing the optical signal in a same frequency band; wherein the analyzer is configured to; produce an absorbance measurement value by subtracting an absorbance measurement obtained in the first measurement cycle from an absorbance measurement obtained in the second measurement cycle; and utilize the produced absorbance measurement value to calculate a concentration of a first gas of the multiple types of gases in the sample gas; wherein the analyzer is configured to; measure absorbance of the optical signal by the sample gas at the first frequency band and the second frequency band in a first measurement cycle; subsequent to the first measurement cycle, measure absorbance of the optical signal by the sample gas at the first frequency band and the second frequency band in a second measurement cycle; calculate a concentration of the first gas type in the sample gas based at least in part on an absorbance measurement obtained in the second measurement cycle for the first frequency band and an absorbance measurement in the first measurement cycle for the second frequency band; and calculate a concentration of the second gas type in the sample gas based at least in part on an absorbance measurement obtained in the second measurement cycle for the second frequency band and an absorbance measurement in the first measurement cycle for the first frequency band.
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22. A computer program product including a non-transitory computer-readable media having instructions stored thereon for processing data information, such that the instructions, when carried out by one or more processing devices, enables the one or more processing device to perform operations of:
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generating an optical signal; at each of multiple frequency bands, measuring an intensity of the optical signal after passing of the optical signal through a sample gas having multiple types of gases that absorb the optical signal in a same frequency band; and detecting concentrations of the multiple types of gases in the sample gas based on absorption of the optical signal at the multiple frequency bands; wherein detecting concentrations of the multiple types of gases in the sample gas includes; utilizing absorbance measurements of the optical signal at a first frequency band and a second frequency band to calculate a concentration of a first gas present in the sample gas; and utilizing absorbance measurements of the optical signal at the first frequency band and the second frequency band to calculate a concentration of a second gas present in the sample gas.
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Specification