Self-calibration approach for tunable laser spectral absorption sensors
First Claim
1. In a spectral absorption system for determining the concentration of a particular gas in a gaseous sample using a sensor to sense a characteristic narrow spectral pulse in the absorption characteristics of the sample the area of which is proportional to the concentration of the particular gas, a method of on-line recalibration of the system to compensate for time or usage induced degradation in system accuracy without introducing a sample of a known concentration of the gas into the system comprising;
- storing information relating to a prior sensor response and a known gas concentration;
combining a stored sensor response to a particular known gas concentration with a present sensor response to simulate a present sensor response to said known particular gas concentration, in the presence of an imprecisely known concentration of the particular known gas; and
updating the stored information to provide information relating the present sensor response and the particular known gas concentration.
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Abstract
An on-line self-calibrating system where prior calibration information is updated by combining prior stored calibration information with current sensor reading information to simulate the introduction of a known calibrating sample and to generate new calibration information. A preferred embodiment of the present invention is in a laser spectral absorption system for determining the concentration of a particular gas in a gaseous sample by sensing a characteristic narrow spectral pulse in the absorption characteristics of the sample, the area or spectral integration of the pulse being proportional to the concentration of the particular gas. The disclosed technique effects on-line recalibration of the system based on current operating parameters of the system to compensate for time or usage induced degradation in system accuracy without introducing a sample of a known concentration of the gas into the system.
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Citations
6 Claims
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1. In a spectral absorption system for determining the concentration of a particular gas in a gaseous sample using a sensor to sense a characteristic narrow spectral pulse in the absorption characteristics of the sample the area of which is proportional to the concentration of the particular gas, a method of on-line recalibration of the system to compensate for time or usage induced degradation in system accuracy without introducing a sample of a known concentration of the gas into the system comprising;
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storing information relating to a prior sensor response and a known gas concentration; combining a stored sensor response to a particular known gas concentration with a present sensor response to simulate a present sensor response to said known particular gas concentration, in the presence of an imprecisely known concentration of the particular known gas; and updating the stored information to provide information relating the present sensor response and the particular known gas concentration. - View Dependent Claims (2, 3, 4, 5, 6)
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Specification