System and method for calibrating remote emissions sensing instruments
First Claim
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1. A method of calibrating of an optical absorption-based multi-gas analyzer (OABMGA), comprising:
- injecting, into an optical path between an electromagnetic radiation source and a detector, a time-variable puff of gas from a cylinder, wherein the cylinder comprises a mixture of gases at known concentration ratios, and wherein the mixture of gases includes a first gas and other gases;
determining a concentration of the first gas in the puff of gas in the optical path based on a predetermined calibration curve for the first gas;
determining a concentration of one or more of the other gases in the optical path based on the determined concentration of the first gas in the optical path and the known concentration ratios for the mixture of gases; and
generating calibration curves for one or more of the other gases based on the determined concentrations of the one or more other gases.
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Abstract
A system and method is provided for obtaining calibration curves for CO and CO2 during laboratory calibration of one or more remote emissions sensing (RES) instruments, and for self-calibration of on-road RES instruments to compensate for changes in background CO and CO2 column densities.
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Citations
24 Claims
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1. A method of calibrating of an optical absorption-based multi-gas analyzer (OABMGA), comprising:
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injecting, into an optical path between an electromagnetic radiation source and a detector, a time-variable puff of gas from a cylinder, wherein the cylinder comprises a mixture of gases at known concentration ratios, and wherein the mixture of gases includes a first gas and other gases;
determining a concentration of the first gas in the puff of gas in the optical path based on a predetermined calibration curve for the first gas;
determining a concentration of one or more of the other gases in the optical path based on the determined concentration of the first gas in the optical path and the known concentration ratios for the mixture of gases; and
generating calibration curves for one or more of the other gases based on the determined concentrations of the one or more other gases. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A system for calibrating an optical absorption-based multi-gas analyzer (OABMGA), comprising:
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an optical path extending between an electromagnetic radiation source and a detector;
a cylinder that injects a time-variable puff of gas into the-optical path, wherein the cylinder comprises a mixture of gases at known concentration ratios, and wherein the mixture of gases includes a first gas and other gases; and
a processor that is configured to;
determine a concentration of the first gas in the puff of gas in the optical path based on a predetermined calibration curve for the first gas;
determine a concentration of one or more of the other gases in the optical path based on the determined concentration of the first gas in the optical path and the known concentration ratios for the mixture of gases; and
generate calibration curves for one or more of the other gases based on the determined concentrations of the one or more other gases. - View Dependent Claims (9, 10, 11, 12, 13, 14)
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15. A method of calibrating an optical absorption-based multi-gas analyzer (OABMGA), comprising:
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injecting, into an optical path between an electromagnetic radiation source and a detector, a puff of gas from a cylinder, wherein the cylinder comprises a first gas and a second gas at a predetermined concentration ratio, and wherein the detector generates a first signal that corresponds to the first gas and a second signal that corresponds to the second gas;
determining, based on the first signal, a change in a column density of the first gas in the optical path between a first point in time and a second point in time;
determining, based on the predetermined concentration ratio and the change in the column density of the first gas in the optical path between the first point in time and the second point in time, a change in a column density of the second gas between the first point in time and the second point in time;
determining, based on the second signal and the change in the column density of the second gas in the optical path between the first point in time and the second point in time, a calibration value that corresponds to the second gas; and
implementing the calibration value to determine the column density of the second gas in the optical path based on the second signal. - View Dependent Claims (16, 17, 18, 19)
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20. A system for calibrating an optical absorption-based multi-gas analyzer (OABMGA), comprising:
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an optical path extending between an electromagnetic radiation source and a detector;
a cylinder that injects a puff of gas into the optical path, wherein the cylinder comprises a first gas and a second gas at a predetermined concentration ratio, and wherein the detector generates a first signal that corresponds to the first gas and a second signal that corresponds to the second gas; and
a processor that is configured to;
determine a change in a column density of the first gas in the optical path between a first point in time and a second point in time based on the first signal;
determine a change in a column density of the second gas between the first point in time and the second point in time based on the predetermined concentration ratio and the change in the column density of the first gas in the optical path between the first point in time and the second point in time;
determine a calibration value that corresponds to the second gas based on the second signal and the change in the column density of the second gas in the optical path between the first point in time and the second point in time; and
implement the calibration value to determine the column density of the second gas in the optical path based on the second signal. - View Dependent Claims (21, 22, 23, 24)
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Specification