METHOD AND SYSTEM FOR DETECTING MOISTURE IN A PROCESS GAS INVOLVING CROSS INTERFERENCE
First Claim
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1. A system, comprising:
- an analyzer configured to detect moisture, or interferent(s), or both, in a process gas, wherein the analyzer comprises;
an absorption cell enclosing and conducting the process gas;
a pressure control device configured to reduce a pressure of the process gas inside the absorption cell to provide de-pressurized process gas sample at a pressure lower than an ambient pressure of the process gas;
a light emitting device configured to transmit light through the de-pressurized process gas inside the absorption cell;
a photodetector configured to detect an intensity of the light transmitted through the de-pressurized process gas and exiting the absorption cell; and
electronic circuitry configured to detect moisture, or one or more interferents, or both, in the process gas, using variable gas compensation logic, wherein the variable gas compensation logic is configured to compensate moisture detection for the interferents utilizing one or more X values associated with certain absorption features of the interferents and one or more ratio functions of the interferents.
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Abstract
A system includes a moisture analyzer configured to detect moisture in a process gas. The moisture analyzer includes an absorption cell that encloses and conducts the process gas. The moisture analyzer also includes a pressure control device that may reduce a pressure of the process gas inside the absorption cell. The moisture analyzer includes a light emitting device that may transmit light through the process gas inside the absorption cell, as well as a photodetector that may detect an intensity of the light transmitted through the process gas and exiting the absorption cell.
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Citations
20 Claims
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1. A system, comprising:
an analyzer configured to detect moisture, or interferent(s), or both, in a process gas, wherein the analyzer comprises; an absorption cell enclosing and conducting the process gas; a pressure control device configured to reduce a pressure of the process gas inside the absorption cell to provide de-pressurized process gas sample at a pressure lower than an ambient pressure of the process gas; a light emitting device configured to transmit light through the de-pressurized process gas inside the absorption cell; a photodetector configured to detect an intensity of the light transmitted through the de-pressurized process gas and exiting the absorption cell; and electronic circuitry configured to detect moisture, or one or more interferents, or both, in the process gas, using variable gas compensation logic, wherein the variable gas compensation logic is configured to compensate moisture detection for the interferents utilizing one or more X values associated with certain absorption features of the interferents and one or more ratio functions of the interferents. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. A method for detecting moisture, one or more interferents, or both, compensating for a variation in chemical composition, pressure, temperature, or a combination thereof, of a process gas, comprising:
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reducing, with a pressure control device, a pressure of the process gas inside an absorption cell enclosing and conducting the process gas to provide a de-pressurized process gas at a pressure lower than an ambient pressure of the process gas; collecting, with a spectral analyzer, one or more spectra of the de-pressurized process gas, and its light-absorbing constituents including moisture and one or more of the interferents; defining marks at certain X values in accordance with certain absorption features of moisture or the interferents on the spectral analyzer; determining one or more ratio functions that are defined as a ratio of Y values at two different marks within the spectrum of each interferent; utilizing the determined ratio functions to disentangle the spectral interference between the moisture and the interferents, present in the spectrum of the de-pressurized process gas, to compute the Y values attributing to moisture and the interferents; and determining, with the spectral analyzer, at least one concentration of the moisture, the one or more interferents, or a combination thereof. - View Dependent Claims (13, 14, 15, 16, 17)
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18. A tangible, non-transitory, machine-readable medium, comprising machine-readable instructions to:
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receive, from a spectral analyzer, one or more spectra of a de-pressurized process gas, and its light-absorbing constituents including moisture and one or more of the interferents, wherein a pressure control device reduces a pressure of a process gas inside an absorption cell enclosing the process gas to generate the de-pressurized process gas, and wherein the pressure of the de-pressurized process gas is lower than an ambient pressure of a sample gas; define, via a processor, marks at certain X values of the one or more spectra of the de-pressurized process gas and its light-absorbing constituents in accordance with certain absorption features of moisture or the interferents on the spectral analyzer; determine, via the processor, one or more ratio functions that are defined as a ratio of Y values at two different marks within the spectrum of each interferent; and utilize, via the processor, the determined ratio functions to disentangle the spectral interference between the moisture and the interferents, present in the spectrum of the de-pressurized process gas, to compute the Y values attributing to moisture and the interferents. - View Dependent Claims (19, 20)
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Specification