Electrochemical Sensor Element Temperature Compensation
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Solution Overview
Problem
Existing gas detection methods, particularly those using electrochemical sensor elements, face challenges in achieving accurate quantitative and qualitative detection of gas components like O2 and NOx due to sensitivity to ambient conditions and temperature dependencies, leading to disruptive cross-sensitivities and measurement inaccuracies.
Innovation Solution
The method employs an electrochemical sensor element with multiple temperature measuring cells to record temperatures at different locations, allowing for the determination of the gas property by accounting for temperature variations and regulating the sensor temperature to minimize cross-sensitivities, using either identical or separate temperature measuring cells with shared components.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single temperature measurement point is used in the sensor element, then the device complexity is reduced, but the measurement precision deteriorates due to unaccounted temperature distributions
Solution Approach 1:
The sensor element is divided into multiple temperature measurement zones with separate temperature measuring cells positioned at different locations. Each temperature measuring cell independently measures the temperature at its specific location, creating a segmented temperature monitoring system that captures the temperature distribution across the sensor element without requiring a single complex measurement structure.
Solution Approach 2:
The temperature measurement is extended from a single-point measurement to a multi-point spatial distribution measurement. By adding the spatial dimension of temperature measurement across multiple locations within the sensor element, the system captures temperature gradients and distributions that cannot be detected by a single measurement point, thereby improving measurement precision.
2Device complexity
If temperature regulation is not implemented, then the device complexity is reduced, but the measurement precision deteriorates due to temperature dependencies and cross-sensitivities
Solution Approach 1:
A feedback control system is implemented where the temperatures measured by the multiple temperature measuring cells are continuously monitored and fed back to a control unit. The control unit processes this temperature information and adjusts the heating element accordingly to maintain optimal temperature conditions at each measurement location, minimizing temperature dependencies and cross-sensitivities in the gas detection process.
Solution Approach 2:
The system actively controls and adjusts the temperature parameter at different locations within the sensor element using heating elements. By dynamically changing and maintaining optimal temperature parameters based on measured values, the system compensates for temperature dependencies and cross-sensitivities, thereby improving measurement precision without requiring excessive structural complexity.
3Measurement precision
If multiple temperature measuring cells are used to account for temperature distributions, then the measurement precision is improved, but the device complexity increases
Solution Approach 1:
The temperature measuring cells are designed with multi-functionality, serving both as temperature sensors and as integral parts of the sensor element structure. The electrodes and solid electrolytes in the temperature measuring cells are configured to perform dual roles: measuring temperature at specific locations and contributing to the overall sensor functionality, thereby reducing the need for separate dedicated temperature sensing components and minimizing structural complexity.
Solution Approach 2:
The temperature measurement function is merged with the gas detection structure by integrating temperature measuring cells directly into the sensor element. The electrodes and solid electrolytes used for gas detection are also utilized for temperature measurement, combining multiple functions into a unified structure that improves temperature compensation accuracy without proportionally increasing device complexity.
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 significantly improves the accuracy of gas sensor measurements by accounting for temperature distributions across the sensor element, reducing uncorrectable signal falsifications and enabling precise detection of gas components below the resolution limits of current solid electrolyte sensors.
Implementation Method 1
at least one solid electrolyte connecting the at least two electrodes, for example YSZ, ScSZ and/or other types of solid electrolytes
Implementation Method 2
A temperature at the location of the respective temperature measuring cell is inferred from an internal resistance, in particular an internal electrolyte resistance, of the temperature measuring cell
Implementation Method 3
the at least one property is determined using at least one electrochemical measuring cell of a sensor element
Data Source
Figure 1
Figure 2~4
AI summary
The invention proposes a method for detecting at least one property of a gas in a measuring gas space (112), in particular for detecting at least one gas component of the gas. The at least one property is determined using at least one electrochemical measuring cell (164) of a sensor element (114). In this case, temperatures are detected at at least two different locations of the sensor element (114) and are used when determining the at least one property.