Absorption Spectroscopy Interference Compensation via Pressure Estimation
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Solution Overview
Problem
Conventional absorption spectroscopic systems struggle to accurately measure the concentration of a target gas due to interference from gases that absorb light at the same wavelength, requiring detectors that measure multiple wavelengths to calculate concentrations.
Innovation Solution
An absorption spectroscopic system that includes a detector for light intensity, a total pressure sensor, an interference gas partial pressure estimation unit, an absorbance conversion unit, and a target gas absorbance calculation unit, allowing for accurate measurement of target gas concentration without needing a detector for multiple wavelengths by estimating interference gas partial pressure and converting it into absorbance using stored data.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a detector that detects intensities of light of a plurality of measurement wavelengths is used to accurately measure target gas concentration, then measurement precision is improved, but device complexity increases
Solution Approach 1:
The invention separates the measurement function into two independent parts: a simple detector that measures only light intensity at a single wavelength, and a total pressure sensor that measures total gas pressure. This segmentation allows each component to remain simple while collectively achieving accurate target gas concentration measurement by compensating for interference gas effects through pressure-based concentration estimation.
Solution Approach 2:
The invention introduces total pressure as an intermediary parameter to bridge the gap between simple single-wavelength light intensity measurement and accurate target gas concentration determination. By measuring total pressure and using it to estimate interference gas concentration, the system enables accurate target gas measurement without requiring complex multi-wavelength detection capabilities.
2Measurement precision
If a detector that detects intensities of light of a plurality of measurement wavelengths is used to compensate for interference gases, then measurement precision is improved, but ease of operation deteriorates
Solution Approach 1:
The system divides the measurement task into two simple, independent operations: measuring light intensity with a simple detector and measuring total pressure with a pressure sensor. This segmentation makes the system easier to operate compared to complex multi-wavelength detectors while achieving the same goal of interference gas compensation through the combined use of these two simple measurements.
Solution Approach 2:
The system uses the total pressure measurement to automatically estimate the concentration of interference gases, which then enables automatic compensation for interference effects in the target gas concentration calculation. This self-service approach eliminates the need for complex manual calibration or operation procedures associated with multi-wavelength systems.
3Device complexity
If a simple detector measuring only light intensity is used, then device complexity is reduced, but measurement precision deteriorates due to interference gases
Solution Approach 1:
The invention introduces total pressure as an intermediary parameter that enables a simple single-wavelength detector to achieve accurate target gas concentration measurement. The total pressure measurement serves as a mediator that provides information about interference gas concentration, which is then used to compensate for interference effects and recover accurate target gas concentration data from the simple light intensity measurement.
Solution Approach 2:
The system changes the measurement parameters by introducing total pressure measurement in addition to light intensity measurement. This parameter change enables the system to distinguish between target gas absorption and interference gas absorption, allowing accurate target gas concentration determination even with a simple single-wavelength detector.
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
Enables accurate measurement of target gas concentration from light intensity transmitted through a gas containing interference gases, improving precision by estimating interference gas partial pressure and calculating target gas absorbance, even when target gas concentration is low compared to interference gases.
Implementation Method 1
an absorption spectroscopic system that is provided with a detector which detects an intensity of light transmitted through a gas
Implementation Method 2
a total pressure sensor that measures a total pressure of the gas
Data Source
AI summary
An absorption spectroscopic system is provided with a detector that detects an intensity of light transmitted through a gas, a total pressure sensor that measures a total pressure of the gas, an interference gas partial pressure-absorbance relationship storage unit that stores interference gas partial pressure-absorbance relationship data, an interference gas partial pressure estimation unit that estimates the partial pressure of the interference gas based on the total pressure measured by the total pressure sensor, an interference gas absorbance conversion unit that converts an estimated partial pressure of the interference gas estimated by the interference gas partial pressure estimation unit into an absorbance of the interference gas based on the interference gas partial pressure-absorbance relationship data, and a target gas absorbance calculation unit that calculates an absorbance of the target gas based on output values from the detector and on the absorbance of the interference gas.