Multielectrode Corrosion Sensor Bad Electrode Elimination
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Solution Overview
Problem
Coupled multielectrode sensors face challenges in accurately measuring localized corrosion rates due to the presence of 'bad' electrodes, which can produce false readings and reduce the accuracy of corrosion rate measurements, and existing methods require external power sources or additional electrodes to eliminate these effects.
Innovation Solution
Incorporating switches between electrodes and the coupling joint allows for the disconnection of non-essential anodic electrodes, forcing all electrons from the most corroding electrode to flow externally, thereby eliminating the impact of bad electrodes without the need for external power or additional electrodes, and using statistical analysis to identify and remove contaminated electrodes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If all electrodes are connected to the coupling joint for measurement, then the sensor can detect corrosion rates from all electrodes, but bad electrodes produce false readings and reduce measurement accuracy
Solution Approach 1:
The patent extracts and removes bad electrodes from the coupled multielectrode sensor system by identifying electrodes with abnormal corrosion rates (significantly higher than the average) and disconnecting them from the coupling joint. This extraction eliminates the harmful influence of bad electrodes on the overall measurement accuracy while preserving the functionality of good electrodes.
Solution Approach 2:
The patent implements a feedback mechanism where the corrosion rates of all electrodes are continuously monitored and compared. When an electrode's corrosion rate exceeds a threshold (e.g., more than 3 standard deviations from the mean), the system automatically identifies it as a bad electrode and disconnects it from the coupling joint, creating a closed-loop control system that maintains measurement reliability.
2Measurement precision
If external power sources or additional electrodes are used to eliminate bad electrode effects, then measurement accuracy can be maintained, but device complexity and cost increase
Solution Approach 1:
The patent employs a self-service approach where the coupled multielectrode sensor system automatically identifies and eliminates the influence of bad electrodes through statistical analysis of its own measurement data. The system uses the corrosion rate measurements from all electrodes to identify outliers and automatically adjusts the coupling configuration, eliminating the need for external power sources or additional reference electrodes.
Solution Approach 2:
The patent changes the operational parameters of the sensor system by dynamically adjusting which electrodes are connected to the coupling joint based on real-time corrosion rate measurements. When bad electrodes are detected, the system changes the connection state of those electrodes, effectively filtering out their influence without adding external components.
3Measurement precision
If switches are added to disconnect electrodes from the coupling joint, then bad electrode effects can be eliminated, but device complexity increases
Solution Approach 1:
The patent incorporates switches in advance during the sensor assembly stage, preparing the system for future bad electrode identification and disconnection. These switches are pre-installed but remain closed during normal operation, allowing the system to quickly isolate bad electrodes when needed without requiring complex real-time wiring changes or additional connection components.
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 the accuracy of localized corrosion rate measurements by ensuring that only the true most corroding electrode contributes to the corrosion rate calculation, reducing uncertainties and noise, and allowing for the estimation of bounding maximum localized corrosion rates, including general corrosion rates.
Implementation Method 1
Coupled multielectrode array sensors have been used for corrosion monitoring and electrochemical studies
Implementation Method 2
measure the coupling current from each electrode to the coupling joint
Data Source
AI summary
The bounding corrosion rate is measured with a coupled multielectrode array sensor by decoupling a select number of anodic electrodes on the sensor from the coupling joint. In doing so, all or most of the electrons produced on the anodic electrode that remains connected to the coupling joint are forced to flow to the coupling joint and are thus measured. Because of the large number of electrodes on a multielectrode array sensor, one of them may become contaminated by foreign materials during the measurements or polishing process. The effect of such an electrode on the performance of the sensor can be eliminated by automatically disconnecting it from the coupling joint.