Auxiliary Micro-Electrodes for Gas Sensor Diagnostics
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Solution Overview
Problem
Existing electrochemical gas sensors face challenges in performing diagnostic tests quickly and frequently without disrupting normal operation, as current methods often require perturbing the sensing electrode, leading to extended downtime and infrequent testing.
Innovation Solution
Incorporating additional small, diagnostic micro-electrodes into the sensor design that do not interfere with the sensing process, allowing for continuous or rapid diagnostics by measuring electrolyte conditions, oxygen concentration, and detecting potential failures without interrupting the sensor's operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If diagnostic tests are performed by modulating the sensing electrode, then diagnostic capability is improved, but sensor operational availability deteriorates due to extended downtime and recovery time
Solution Approach 1:
The patent divides the electrode system into separate sensing electrodes and diagnostic micro-electrodes. The diagnostic micro-electrodes are positioned between the sensing electrode and counter electrode, allowing diagnostic functions to be performed independently without interrupting the sensing operation. This segmentation enables simultaneous sensing and diagnostics, resolving the contradiction between diagnostic capability and operational availability.
2Measurement precision
If scanning voltammetry is performed on high surface area gas diffusion electrodes, then diagnostic measurement is improved, but test duration increases requiring several hours to complete
Solution Approach 1:
The patent uses small micro-electrodes with localized measurement capability instead of scanning the entire high surface area sensing electrode. By concentrating the measurement at a small local region with minimal surface area, the diagnostic tests can be completed rapidly in seconds or minutes rather than hours, while still providing sufficient measurement precision to detect sensor degradation and faults.
3Reliability
If the sensing electrode is perturbed for diagnostic testing, then diagnostic information is obtained, but the sensor remains out of operation during the test
Solution Approach 1:
The patent introduces micro-electrodes as intermediary diagnostic elements positioned between the sensing electrode and counter electrode. These intermediary micro-electrodes perform the perturbing diagnostic measurements without directly interfering with the sensing electrode's primary function. The micro-electrodes act as mediators that enable diagnostic testing while allowing the sensing electrode to continue operating normally, thus obtaining diagnostic information without interrupting sensor operation.
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 quick and continuous diagnostic testing without affecting the sensor's operation, identifying potential failures such as gas leaks, electrolyte dehydration, and reference electrode drift, ensuring timely corrective actions and maintaining sensor performance.
Implementation Method 1
The micro-electrode is positioned between the sensing electrode and the counter electrode in an oxygen pump sensor
Implementation Method 2
The micro-electrode can be used to measure the concentration of dissolved species in the electrolyte
Implementation Method 3
a diffusion barrier controlling access to the sensing electrode
Data Source
AI summary
A gas sensor includes know types of electrodes such has sensing electrodes, counter electrodes or reference electrodes to sense the presence of a predetermined gas. In addition, at least one diagnostic electrode is carried in the sensor. The diagnostic electrode implements at least one diagnostic function without substantially impairing the gas sensing function. The diagnostic electrode is immersed in sensor electrolyte.