Automated FTIR gas analyzer
First Claim
1. A system for certifying to a user a concentration of gas in a cylinder comprising:
- a gas cell configured to receive a sample gas from a cylinder,an FTIR (Fourier Transform Infrared) spectrometer coupled to the gas cell for scanning the sample gas and forming a beam spectrum,a processor coupled to the FTIR spectrometer for calculating an intensity response of the sample gas based on the beam spectrum,a storage device for storing data points of a plot of intensity response of a known gas versus concentration levels,wherein the processor is configured to interpolate between the stored data points of the plot to determine an interpolated data point corresponding to a resultant intensity response of the sample gas, andprovide to the user a concentration level of the sample gas based on the interpolated data point,the gas cell configured to receive a standard gas from a cylinder and a zero gas from another cylinder,the FTIR spectrometer configured to scan the standard gas and the zero gas, and the processor configured to calculate an intensity response of the standard gas and an intensity response of the zero gas,wherein the intensity response of the sample gas is Xn, the intensity response of the standard gas is Yn, and the intensity response of the zero gas is Zn, andthe resultant intensity response of the sample gas is based on the following equation;
where;
Xn is the sample intensity response, Yn is the standard intensity response, Ya is the actual value of the standard gas provided as an input value by the user, Zn is the zero intensity response, n is a scan number (n is 1 or greater), and Rn is the resultant intensity response of the sample gas.
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Accused Products
Abstract
A system for certifying a concentration of gas in a cylinder includes a gas cell configured to receive a sample gas from a cylinder, and an FTIR module coupled to the gas cell for scanning the sample gas and forming a beam spectrum. A processor is coupled to the FTIR module for calculating an intensity response of the sample gas based on the beam spectrum. A storage device is included for storing data points of a plot of intensity response of a known gas versus concentration levels. The processor is configured to interpolate between the stored data points of the plot to determine an interpolated data point corresponding to the intensity response of the sample gas. The processor provides to the user a concentration level of the sample gas, based on the interpolated data point.
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Citations
10 Claims
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1. A system for certifying to a user a concentration of gas in a cylinder comprising:
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a gas cell configured to receive a sample gas from a cylinder, an FTIR (Fourier Transform Infrared) spectrometer coupled to the gas cell for scanning the sample gas and forming a beam spectrum, a processor coupled to the FTIR spectrometer for calculating an intensity response of the sample gas based on the beam spectrum, a storage device for storing data points of a plot of intensity response of a known gas versus concentration levels, wherein the processor is configured to interpolate between the stored data points of the plot to determine an interpolated data point corresponding to a resultant intensity response of the sample gas, and provide to the user a concentration level of the sample gas based on the interpolated data point, the gas cell configured to receive a standard gas from a cylinder and a zero gas from another cylinder, the FTIR spectrometer configured to scan the standard gas and the zero gas, and the processor configured to calculate an intensity response of the standard gas and an intensity response of the zero gas, wherein the intensity response of the sample gas is Xn, the intensity response of the standard gas is Yn, and the intensity response of the zero gas is Zn, and the resultant intensity response of the sample gas is based on the following equation; where; Xn is the sample intensity response, Yn is the standard intensity response, Ya is the actual value of the standard gas provided as an input value by the user, Zn is the zero intensity response, n is a scan number (n is 1 or greater), and Rn is the resultant intensity response of the sample gas. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A system for certifying to a user a concentration of gas in a cylinder comprising:
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a gas cell configured to receive a sample gas from a cylinder, an FTIR (Fourier Transform Infrared) spectrometer coupled to the gas cell for scanning the sample gas and forming a beam spectrum, a processor coupled to the FTIR spectrometer for calculating an intensity response of the sample gas based on the beam spectrum, a storage device for storing data points of a plot of intensity response of a known gas versus concentration levels, wherein the processor is configured to interpolate between the stored data points of the plot to determine an interpolated data point corresponding to a resultant intensity response of the sample gas, and provide to the user a concentration level of the sample gas based on the interpolated data point, the gas cell is configured to receive a standard gas from a cylinder and a zero gas from another cylinder, the FTIR spectrometer is configured to scan the standard gas and the zero gas, the processor is configured to calculate an intensity response of the standard gas and an intensity response of the zero gas, and the resultant intensity response of the sample gas is calculated based on a sequence of first, second and third tests; wherein the first test includes a scan order of scanning first the zero gas, second the standard gas, and third the sample gas, and then computing a first correction, the second test includes a scan order of scanning first the standard gas, second the zero gas, and third the sample gas, and then computing a second correction, the third test includes a scan order of scanning first the standard gas, second the sample gas, and third the zero gas, and then computing a third correction, and the resultant intensity response is based on the first, second and third corrections. - View Dependent Claims (9)
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10. A system for certifying to a user a concentration of gas in a cylinder comprising:
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a gas cell configured to receive a sample gas from a cylinder, an FTIR (Fourier Transform Infrared) spectrometer coupled to the gas cell for scanning the sample gas and forming a beam spectrum, a processor coupled to the FTIR spectrometer for calculating an intensity response of the sample gas based on the beam spectrum, a storage device for storing data points of a plot of intensity response of a known gas versus concentration levels, wherein the processor is configured to interpolate between the stored data points of the plot to determine an interpolated data point corresponding to the intensity response of the sample gas, and provide to the user a concentration level of the sample gas based on the interpolated data point, a gas divider is disposed between the gas cell and the cylinder for diluting the concentration of the sample gas in the cylinder, and when the sample gas in the cylinder has a concentration level greater than the concentration levels of the known gas stored in the storage device, then the gas divider is configured to dilute the sample gas before scanning.
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Specification