Sensor Module Microheater Thermal Conductivity Gas Analysis
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Solution Overview
Problem
Existing gas concentration measurement technologies face challenges in accurately measuring hydrogen concentration in gas mixtures containing multiple gases, such as air, water vapor, and carbon dioxide, due to variations in thermal conductivity, leading to inaccurate hydrogen concentration calculations.
Innovation Solution
A sensor module with a microheater and control apparatus that uses thermal conductivity data to solve simultaneous equations based on heater temperatures at different power levels, accounting for the thermal conductivity of various gases in the mixture to accurately calculate hydrogen concentration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If thermal conductivity of gas is used to measure gas concentration, then measurement capability is provided, but measurement precision deteriorates when multiple gases are present due to varying thermal conductivities
Solution Approach 1:
The patent segments the measurement process into multiple discrete steps: (1) measuring heater temperature at first power supply level, (2) measuring heater temperature at second power supply level, (3) calculating temperature differences, and (4) solving simultaneous equations. This segmentation allows the complex problem of multi-gas measurement to be broken down into manageable computational steps, improving measurement precision without requiring a single complex sensor device.
Solution Approach 2:
The patent introduces a new dimension to the measurement by using power supply level as an additional variable. Instead of relying solely on thermal conductivity differences between gases, the system measures temperature at multiple power levels (first and second power supply levels), creating a multi-dimensional measurement space that enables differentiation of multiple gases through mathematical analysis.
2Measurement precision
If heater temperature is measured at single power level, then device operation is simple, but measurement precision is insufficient for multi-gas mixtures
Solution Approach 1:
The patent implements periodic action by alternating between first and second power supply levels to the heater. The control apparatus periodically switches power levels and measures temperature at each level, creating a rhythmic measurement cycle. This periodic measurement approach enables the system to gather sufficient data for accurate multi-gas analysis while maintaining relatively simple operational procedures through automated cycling.
Solution Approach 2:
The patent changes the power supply parameter from a single fixed value to multiple discrete levels. By varying the power supply level between first and second levels and measuring corresponding temperature differences, the system transforms a simple single-point measurement into a multi-parameter measurement process, significantly improving hydrogen concentration accuracy in multi-gas environments.
3Reliability
If conventional thermal conductivity measurement is used, then device structure is simple, but reliability deteriorates due to inaccurate calculations in complex gas mixtures
Solution Approach 1:
The patent implements feedback through an iterative calculation process where the control apparatus uses measured temperatures from multiple power levels to solve simultaneous equations. The system continuously refines the gas concentration calculations by comparing measured temperature differences with expected thermal conductivity values, improving measurement reliability through mathematical feedback loops that account for multiple gas components.
Solution Approach 2:
The patent introduces mathematical equations as an intermediary between the physical measurement and the final concentration result. Instead of directly converting single temperature readings to concentration values, the system uses simultaneous equations as a mediating computational layer that processes temperature data from multiple power levels, enabling reliable determination of gas concentrations in complex mixtures.
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 precise measurement of hydrogen concentration in gas mixtures by accounting for the thermal conductivity of multiple gases, improving accuracy and reliability compared to conventional methods.
Implementation Method 1
a microheater 10 of thermal conduction type that generates heat according to supplied power
Implementation Method 2
a microheater 10 of thermal conduction type that generates heat according to supplied power
Data Source
AI summary
Provided is a sensor module that measures concentration of at least one type of gas contained in a gas mixture. The sensor module includes a microheater of thermal conduction type that generates heat according to supplied power, and a control apparatus that is able to communicate with the microheater, in which the control apparatus detects a first detection value corresponding to first temperature of the microheater at a time of supply of first power, detects a second detection value corresponding to second temperature of the microheater at a time of supply of second power higher than the first power, and calculates the concentration of the at least one type of gas contained in the gas mixture based on the first detection value, the second detection value, and thermal conductivity data related to thermal conductivity of each of a plurality of types of gases contained in the gas mixture.