Gas Sensor Solid Electrolyte Heater Placement
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Solution Overview
Problem
Existing gas sensors face challenges in maintaining accurate detection of specific gas components, particularly when transient temperature variations occur, due to inadequate heat transfer to the sensor cell, leading to fluctuations in temperature and reduced detection accuracy.
Innovation Solution
A gas sensor design with a sensor cell located on the second solid electrolyte, closer to the heater, and separated pump cells to quickly adjust oxygen concentration, ensuring efficient heat transfer and maintaining target temperature ranges, thereby improving detection accuracy and responsiveness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the sensor cell is located on the first solid electrolyte away from the heater, then the structure is simpler, but the temperature stability of the sensor cell deteriorates due to inadequate heat transfer
Solution Approach 1:
The patent divides the solid electrolyte into two separate layers: a first solid electrolyte for oxygen concentration adjustment and a second solid electrolyte for sensor cell placement. This segmentation allows the sensor cell to be positioned on the second solid electrolyte which is adjacent to the heater, ensuring adequate heat transfer and temperature stability while maintaining functional separation between oxygen adjustment and detection processes.
2Temperature
If the sensor cell is located away from the heater, then heat transfer to the sensor cell is insufficient, but placing it closer to the heater improves temperature control
Solution Approach 1:
The second solid electrolyte acts as an intermediary layer between the heater and the sensor cell. It is positioned adjacent to the heater to efficiently conduct heat to the sensor cell, ensuring the sensor cell maintains target temperature even during transient variations. This intermediary structure resolves the conflict between needing close proximity for heat transfer and maintaining functional separation.
3Volume of moving object
If the pump cells are integrated in one location, then the device is more compact, but the responsiveness of oxygen concentration adjustment deteriorates
Solution Approach 1:
The pump functionality is segmented into two separate pump cells distributed at different locations within the measurement gas chamber. This segmentation allows each pump cell to operate independently and simultaneously, achieving faster overall oxygen concentration adjustment responsiveness while maintaining a compact sensor element structure through efficient spatial arrangement.
4Productivity
If the sensor cell is positioned downstream from pump cells, then the detection sequence is optimized, but the temperature maintenance requires additional measures
Solution Approach 1:
The patent combines the temperature maintenance function with the structural design by positioning the sensor cell on the second solid electrolyte that is adjacent to the heater. This merging of thermal management into the structural arrangement eliminates the need for additional temperature maintenance measures, while still achieving optimized detection sequence through proper positioning of the sensor cell downstream from the pump cells.
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 gas sensor achieves improved accuracy and responsiveness in detecting specific gas components by ensuring quick heat transfer to the sensor cell and reducing temperature fluctuations, while also reducing electric power consumption.
Implementation Method 1
heat generated during operation of the heater can be more quickly transferred to the sensor cell
Implementation Method 2
a first solid electrolyte which has a plate shape, has oxygen ionic conductivity, is located between the first reference gas chamber and the measurement gas chamber
Implementation Method 3
adjusts an oxygen concentration in the measurement gas chamber by energization between the first reference electrode and the first pump electrode
Data Source
AI summary
Provided is a gas sensor improving accuracy of detection of specific gas in measurement gas, while maintaining high responsiveness in detection of the specific gas. A sensor element of a gas sensor includes a first solid electrolyte and second solid electrolyte having oxygen ionic conductivity, a measurement gas chamber into which measurement gas is introduced, a first reference gas chamber and second reference gas chamber into which reference gas is introduced, a first pump cell, a second pump cell, a sensor cell, and a heater. The sensor cell detects a specific gas component in the measurement gas having an oxygen concentration adjusted by the pump cells. The heater is located opposite to a second principal surface of the second solid electrolyte on which the sensor cell is formed.