Gas Concentration Measurement Device Temperature Compensation
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Solution Overview
Problem
Conventional gas concentration measurement devices face accuracy issues due to varying absorption characteristics of gases with temperature and machine differences, leading to decreased measurement accuracy.
Innovation Solution
A concentration measurement device that includes a measurement cell with a flow path, a light source, photodetector, pressure sensor, temperature sensor, and an arithmetic circuit that calculates gas concentration using a determined extinction coefficient based on temperature and peak wavelength, with multiple extinction coefficients stored in memory to account for temperature and wavelength variations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a single extinction coefficient is used for concentration measurement, then the device complexity is reduced, but the measurement precision deteriorates due to temperature variations and machine differences
Solution Approach 1:
The patent applies parameter changes by storing multiple extinction coefficients corresponding to different temperature conditions and selecting the appropriate coefficient based on the actual measurement temperature. This resolves the contradiction by dynamically adapting the extinction coefficient parameter to match operating conditions, thereby maintaining high measurement precision without requiring complex real-time calculation systems.
Solution Approach 2:
The patent implements preliminary action by pre-calculating and storing multiple extinction coefficients for different temperature conditions and machine configurations before actual measurement. This allows the system to quickly select the appropriate coefficient during measurement without performing complex real-time calculations, thus improving measurement precision while keeping the device complexity manageable.
2Measurement precision
If multiple extinction coefficients are stored for different temperatures and wavelengths, then the measurement precision is improved, but the memory requirement and device complexity increase
Solution Approach 1:
The patent manages the quantity of stored data by organizing extinction coefficients according to specific parameters (temperature ranges and wavelength bands). Instead of storing all possible combinations, the system stores coefficients for representative conditions and uses interpolation or selection based on measured parameters, thereby maintaining high measurement precision while minimizing memory requirements.
3Measurement precision
If the extinction coefficient is determined based on temperature and peak wavelength, then the measurement precision is improved, but the calculation complexity increases
Solution Approach 1:
The patent reduces calculation complexity by performing preliminary actions: pre-calculating extinction coefficients for various temperature and wavelength conditions and storing them in memory. During actual measurement, the system simply retrieves the appropriate pre-calculated coefficient based on measured temperature and wavelength, avoiding complex real-time calculations while maintaining high 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
This approach enhances measurement accuracy by accounting for temperature and machine differences, preventing accuracy deterioration and providing precise gas concentration measurements.
Implementation Method 1
the light passing through the measurement cell is received by a light receiving element for measuring an absorbance
Implementation Method 2
a light having a predetermined wavelength is made to enter from a light source through a light incident window into a measurement cell through which a measurement gas flows
Implementation Method 3
from the measured absorbance, the concentration of the measured gas can be determined according to Lambert-Beer law
Data Source
AI summary
A Concentration measurement device 100 comprises: a measurement cell 4 having a flow path through which a gas flows, a light source 1 for generating incident light to the measurement cell, a photodetector 7 for detecting light emitted from the measurement cell, a pressure sensor 20 for detecting a pressure of the gas in the measurement cell, a temperature sensor 22 for detecting a temperature of the gas in the measurement cell, and an arithmetic circuit 8 for calculating a concentration of the gas based on an output P of the pressure sensor, an output T of the temperature sensor, an output I of the photodetector, and an extinction coefficient α, wherein the arithmetic circuit 8 is configured to calculate the concentration using the extinction coefficient α determined on the basis of the output of the temperature sensor 22.