Gas Analysis Spectrum Correction for Coexisting Interference
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Solution Overview
Problem
Conventional laser-based gas analysis methods, such as TDLAS, suffer from measurement errors due to interference effects from coexisting components and wavelength shifts caused by ambient temperature changes, leading to broadened absorption spectra and inaccurate concentration measurements.
Innovation Solution
An analysis device that corrects for changes in light absorption spectra caused by coexisting components and wavelength shifts using a broadening factor and wavelength shift amount, calculated through parameter determination and correlation value analysis, allowing for accurate concentration measurements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional TDLAS method is used for gas concentration measurement, then the measurement process is simple, but measurement precision deteriorates due to coexistent effect and wavelength shift
Solution Approach 1:
The patent applies preliminary action by pre-calculating and storing correction values for coexistent effects and wavelength shifts in a correction table before actual measurement. During measurement, the system simply retrieves and applies the appropriate correction values based on measured parameters, avoiding complex real-time calculations while maintaining high measurement precision
Solution Approach 2:
The patent introduces correction values as an intermediary element that mediates between the raw absorption spectrum measurements and the final concentration results. These correction values compensate for coexistent effects and wavelength shifts, allowing the system to achieve high measurement accuracy without requiring complex real-time physical modeling
2Measurement precision
If correction for coexistent effect and wavelength shift is implemented, then measurement precision improves, but device complexity increases
Solution Approach 1:
The patent performs complex correction calculations in advance and stores the results in lookup tables. During actual operation, the system only needs to retrieve pre-computed correction values based on measured parameters like pressure and temperature, dramatically reducing processing load and device complexity while maintaining high measurement precision
Solution Approach 2:
The patent creates a simplified computational model by copying and storing correction relationships in tabular form rather than performing complex physical calculations in real-time. This allows the system to achieve accurate corrections through simple table lookups instead of computationally intensive simulations
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The device achieves precise concentration measurements by correcting for coexistent effects and wavelength shifts, reducing processing load and device size while maintaining accuracy.
Implementation Method 1
an analysis device that uses light absorption
Implementation Method 2
obtaining an absorption spectrum of the measurement-target gas (tunable diode laser absorption spectroscopy (TDLAS))
Implementation Method 3
a photodetector that detects an intensity of sample light that is the reference light having transmitted through the sample
Data Source
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AI summary
The present invention is for measuring the concentration of a target component highly accurately, by correcting a change in the light absorption spectrum of the measurement target component, the change caused by the coexistent effect of a coexisting component or a wavelength shift of reference light, and is an analysis device 100 that analyzes a target component included in a sample, the analysis device including: a light source 2 that outputs the reference light toward the sample; a photodetector 3 that detects an intensity of sample light that is the reference light having transmitted through the sample; a parameter determining unit 64, 66 that determines a parameter representing a change in a light absorption spectrum of the target component or a change in a light absorption spectrum of an interference component, the change being caused by a coexisting component included in the sample or by a wavelength shift of the reference light; and a concentration calculating unit 65 that calculates a corrected concentration of the target component, from an intensity-related signal related to the intensity of the sample light, by using the parameter representing the change in the light absorption spectrum.