Dynamic and real-time correction of differential measurement offsets in a gas analysis system
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Publication Number
US-11585797-B2
Publication Date
2023-02-21
Expiration Date
Abstract
Systems and method for automatically determining offset correction values in a differential measurement system, and for correcting measurement offsets between two measurement devices in the differential measurement system. A method for determining real-time offset corrections in a gas analysis system having first and second gas analyzers includes for each of a plurality of gas concentrations within a range of gas concentrations: a) supplying the concentration of gas to the first and second gas analyzers through first and second gas flow lines, respectively; b) measuring a first gas concentration value using the first gas analyzer; and c) measuring a second gas concentration value using the second gas analyzer. The method may also include determining an offset value between each corresponding first and second gas concentration value, and determining a functional relationship between the offset values and gas concentration measurements of the first gas analyzer.
Core Innovation
The invention relates to determining real-time offset corrections in a gas analysis system using a first gas analyzer and a second gas analyzer. A varying concentration of gas is supplied over a range of gas concentrations through a first gas flow line and a second gas flow line, and for each of a plurality of different supplied gas concentrations, a first gas concentration value and a second gas concentration value are measured, with an offset value determined between each corresponding first and second gas concentration value.
A functional relationship is then determined between the plurality of offset values and the measured gas concentration values of the first gas analyzer. After the functional relationship is determined, real-time gas concentration measurement values are taken and dynamically adjusted based on the functional relationship.
In embodiments, the functional relationship is determined by applying a fit function to the plurality of offset values, and may be determined using range segments with distinct segment fit functions for different portions of a gas concentration range. The gas analysis system includes a gas source, a first gas analyzer coupled to the first gas flow line, a second gas analyzer coupled to the second gas flow line, and a control circuit configured to send control signals to adjust the concentration of gas supplied to both gas flow lines.
Claims Coverage
The independent claims cover both a method and a system for determining and applying real-time offset corrections between a first and second measurement device, including gas analyzers. Across the independent claims, the core inventive approach is to supply a plurality of different supplied values within a range, obtain corresponding measurements, determine a plurality of offset values, determine a functional relationship between offsets and first-device measurements, and thereafter dynamically adjust real-time measurements based on the functional relationship.
Varying supplied gas concentration with corresponding analyzer offsets
Supplying a varying concentration of gas over a range of gas concentrations to the first gas analyzer through a first gas flow line and to the second gas analyzer through a second gas flow line; for each of a plurality of different supplied gas concentrations within the range, measuring a first gas concentration value using the first gas analyzer, measuring a second gas concentration value using the second gas analyzer, and determining an offset value between each corresponding first and second gas concentration value.
Functional relationship between offsets and first-analyzer measurements
Determining a functional relationship between the plurality of offset values and the measured gas concentration values of the first gas analyzer.
Dynamic real-time adjustment using the functional relationship
Taking real-time gas concentration measurement values and dynamically adjusting the real-time gas concentration measurement values of the first gas analyzer based on the functional relationship.
Differential measurement devices across a range of supplied property values
For each of a plurality of different supplied property values of the physical property within a range of property values, obtaining a first measurement value using the first measurement device and obtaining a second measurement value using the second measurement device; determining a plurality of offset values between corresponding first and second physical property measurement values.
Functional relationship for first-device offset correction
Determining a functional relationship between the plurality of offset values and the physical property measurement values of the first measurement device.
Control circuit configured to determine offsets and functional relationship
In a differential measurement system, including a first measurement device, a second measurement device, and a control circuit configured to, for each plurality of different supplied property values within a range, receive first and second measurement values, determine offset values between corresponding first and second physical property measurement values, and determine a functional relationship between the plurality of offset values and the physical property measurement values of the first measurement device.
Across the independent claims, the document consistently requires determining offset values between corresponding first and second measurements for a plurality of supplied values within a range, determining a functional relationship between the offsets and the first-device measurements, and then using that functional relationship to dynamically adjust real-time measurement values.
Stated Advantages
Documented Applications
Non-steady-state measurements are described as being applicable to RACiR/rapid response curves.
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