Analysis device, program for analysis device, and analysis method
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Solution Overview
Problem
Existing gas analysis devices struggle to accurately measure components like CO2, CO, C2H4, C2H6, H2O, C2H2, CH4, NH3, and CH3OH in processing gases due to interference effects from other gases, and the selection of suitable wavelength ranges is limited by available databases and experimental methods.
Innovation Solution
An analysis device using a laser light source and photodetector to measure target components at specific absorption wavelengths (4.23-4.24 μm, 4.34-4.35 μm, etc.) with a quantum cascade laser for mid-infrared range, and a concentration calculation unit to reduce interference by modulating wavelengths and using absorption modulation signals.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a preliminary investigation using publicly available infrared absorption spectrum database is performed to select wavelength range, then the selection process is simplified to a certain extent, but the database has limits on types of gases and wavelength ranges and cannot provide correct wavelength range for all cases
Solution Approach 1:
The patent performs preliminary action by pre-storing multiple wavelength ranges for different measurement target components and interference component types in a storage unit. This allows the system to quickly retrieve appropriate wavelength ranges without performing repeated experiments, thus simplifying the selection process while ensuring accuracy through pre-validated wavelength ranges.
2Measurement precision
If repeated experiments using actual measurement target gas and interference gas are performed to select correct wavelength range, then the wavelength range selection becomes accurate, but the process becomes time-consuming and complex
Solution Approach 1:
The patent performs preliminary action by pre-storing multiple wavelength ranges for different measurement target components and interference component types in a storage unit. This allows the system to quickly retrieve appropriate wavelength ranges without performing repeated experiments, thus simplifying the selection process while ensuring accuracy through pre-validated wavelength ranges.
3Adaptability or versatility
If the measurement target component is the same, the appropriate wavelength range may vary due to concentration, pressure, or temperature of the measurement target component, or due to the type of interference gas that is present, but the analysis device in Patent Document 1 does not consider setting wavelength range
Solution Approach 1:
The patent implements dynamics by making the wavelength range selectable and adjustable based on the specific measurement conditions. The concentration calculation unit can select from multiple pre-stored wavelength ranges depending on the measurement target component and detected interference components, allowing the system to adapt to different concentrations, pressures, temperatures, and interference gas types while maintaining measurement precision.
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
Accurately measures low to high concentrations of target gases with reduced interference, improving measurement accuracy by selecting optimal wavelength ranges and using a long optical path length.
Implementation Method 1
a laser light source that irradiates reference light onto the processing gas, a photodetector that detects an intensity of sample light that is generated as a result of the reference light being transmitted through the processing gas
Implementation Method 2
in a case in which a concentration of the carbon dioxide is being measured, the concentration calculation unit calculates this concentration based on a carbon dioxide absorption between 4.23 ̃4.24 μm, or 4.34 ̃4.35 μm
Data Source
AI summary
The present invention enables a concentration of a measurement target component in a processing gas to be accurately measured. The present invention enables a concentration of carbon dioxide to be calculated based on a carbon dioxide absorption, a concentration of carbon monoxide to be calculated based on a carbon monoxide absorption, a concentration of water to be calculated based on a water absorption, a concentration of acetylene to be calculated based on an acetylene absorption, a concentration of methane to be calculated based on a methane absorption, a concentration of ethylene to be calculated based on an ethylene absorption, a concentration of ethane to be calculated based on an ethane absorption, a concentration of ammonia to be calculated based on an ammonia absorption, and a concentration of methanol to be calculated based on a methanol absorption.