Atmospheric Corrosion Sensing Electrode Using Resistive Bridge Circuit
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Solution Overview
Problem
Current methods for measuring atmospheric corrosion of pipelines are complex, expensive, and sensitive to environmental factors, making them inadequate for effective corrosion monitoring.
Innovation Solution
The development of an atmospheric corrosion sensing electrode and sensor system that uses a resistive bridge circuit, specifically a Wheatstone bridge, to measure changes in electrical resistance of a sample material, allowing for accurate detection of corrosion through DC measurements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If complex AC impedance measurements are used to determine atmospheric corrosion, then measurement capability is provided, but device complexity and cost increase
Solution Approach 1:
The patent replaces complex AC impedance measurement systems with a simple DC resistance measurement system. The corrosion sensing electrode uses a straightforward voltage divider circuit with a sample material resistance element, eliminating the need for complex integrated circuits and AC measurement equipment while maintaining corrosion detection capability.
Solution Approach 2:
The patent employs a disposable corrosion sensing electrode with a sample material that is intentionally designed to corrode in place of the protected metal structure. This sacrificial sample provides continuous corrosion data through resistance changes, replacing expensive and complex monitoring systems with a simple, cost-effective solution.
2Measurement precision
If AC impedance measurements are used for atmospheric corrosion, then corrosion data is obtained, but sensitivity to environmental factors increases
Solution Approach 1:
The patent substitutes AC impedance measurement with DC resistance measurement, which is inherently less sensitive to environmental factors such as temperature fluctuations, humidity changes, and electromagnetic interference. The simple DC voltage divider circuit provides stable measurements that are not affected by the environmental sensitivities that plague AC impedance systems.
3Measurement precision
If expensive integrated circuits are used for AC impedance measurements, then atmospheric corrosion can be measured, but cost increases
Solution Approach 1:
The patent replaces expensive AC impedance measurement integrated circuits with a simple DC resistance measurement system using basic electronic components. The corrosion sensing electrode uses a voltage divider circuit with a sample material resistance element, requiring only a power source and voltmeter, thereby dramatically reducing manufacturing costs while maintaining measurement capability.
Solution Approach 2:
The patent employs a low-cost, disposable corrosion sensing electrode that provides atmospheric corrosion measurement data through simple resistance changes. The sacrificial sample material corrodes in place of the protected structure, providing continuous monitoring data without requiring expensive electronics or complex manufacturing processes.
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 solution provides a simpler, less expensive, and more accurate method for detecting atmospheric corrosion, reducing sensitivity to environmental factors and improving the reliability of corrosion monitoring.
Implementation Method 1
measuring the electrical resistance of an exposed sample material in order to determine mass loss due to atmospheric corrosion
Implementation Method 2
uses a resistive bridge circuit, specifically a Wheatstone bridge, to measure changes in electrical resistance of a sample material
Data Source
AI summary
An atmospheric corrosion sensing electrode is configured for sensing atmospheric corrosion through changes in the resistance of a sample material on the electrode. The electrode is configured to removably connect with a data logger or other instrumentation. The electrode includes a corrosion circuit with first and second legs in parallel. The first leg includes first and second resistive components connected in series, and the second leg includes a third resistive component and a sample material in series. The electrode has a protective coating overlaying the first, second, and third resistive components but not the sample material. At least one electrical connector is configured to connect the corrosion sensing electrode to a data logger. An atmospheric corrosion sensor includes a data logger connected with an atmospheric corrosion sensing electrode. The data logger is configured to determine changes in atmospheric corrosion based on changes in a resistance of the electrode.