Corrosion Sensor Patterned Thin Film High Resistance
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Solution Overview
Problem
Existing corrosion sensors have limited resistance, leading to a low signal-to-noise ratio and requiring high current to obtain a measurable voltage signal, making them inefficient for detecting corrosion in metallic materials.
Innovation Solution
A corrosion sensor design featuring patterned conductive thin films with narrow conducting tracks and adjacent conducting regions, which increases the sensor's resistance while maintaining wettability similar to the bulk material, allowing for better indication of average corrosion effects and extended monitoring periods.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional corrosion sensors use standard conductive thin film patterns, then the sensor can be manufactured with simple processes, but the resistance is limited to around 1 Ω which results in low signal-to-noise ratio
Solution Approach 1:
The conductive thin film is segmented into multiple separate conducting regions rather than forming continuous tracks. This segmentation increases the total resistance by creating discrete current paths that must pass through multiple gaps, thereby improving the signal-to-noise ratio while maintaining manufacturability through standard thin film deposition processes
Solution Approach 2:
The sensor design transitions from two-dimensional continuous tracks to a configuration involving multiple separated conducting regions arranged in specific patterns. This dimensional rearrangement increases resistance without requiring additional manufacturing steps, as the separation is achieved through pattern definition rather than physical removal of material
2Measurement precision
If the conducting tracks are made narrower to increase resistance, then the signal-to-noise ratio improves, but the wettability of the sensor surface changes which affects corrosion representation
Solution Approach 1:
Different regions of the sensor have different properties: the conducting regions are narrow to provide high resistance and good signal-to-noise ratio, while the gaps between conducting regions are designed to maintain appropriate wettability characteristics. This local differentiation allows the sensor to achieve both high measurement precision and reliable corrosion representation
Solution Approach 2:
The design changes the geometric parameters of the conducting regions (narrow width) to increase resistance, while compensating for the wettability change by adjusting the gap dimensions and arrangement. This parameter optimization allows the sensor to maintain both high resistance and appropriate surface wettability for accurate corrosion monitoring
3Measurement precision
If high current is used to obtain measurable voltage signal from low resistance sensors, then the voltage signal becomes detectable, but the energy consumption increases and the sensor efficiency decreases
Solution Approach 1:
The sensor resistance is changed from low (1 Ω) to high (1 kΩ or more) by using separated conducting regions. This parameter change allows measurable voltage signals to be obtained with much lower current, thereby reducing energy consumption and improving sensor efficiency while maintaining measurement precision
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 sensor achieves a significantly higher resistance, improving the signal-to-noise ratio and enabling more accurate and prolonged corrosion monitoring, with resistance values up to 1 kΩ, compared to the prior art's maximum of 1 Ω, facilitating robust and efficient corrosion detection.
Implementation Method 1
the resistance of the sensors is measured over a period of time. The result of the action of corrosive media on the tracks is an increase in the overall resistance of the sensor
Implementation Method 2
detecting the action of corrosive media acting on a metallic material
Implementation Method 3
maintain a certain minimum separation between the tracks, again in order to avoid an enhancement of the rate of corrosion because of geometric effects
Data Source
Figure 1~2
Figure 3~4
AI summary
A corrosion sensor for detecting the action of corrosive media on a metallic material when mounted in situ adjacent a location in the metallic material is disclosed. The corrosion sensor comprises a patterned conductive thin film formed on a substrate. The thin filmdefinesfirst and second terminals, a first conducting track running between the first and the second terminals, and conducting regions separated from theterminals and the first conducting track, and disposed adjacent either side of the first conducting track.In preferred embodiments, paint substantially covers the substrate and the thin film. A defect is formed in the paint at the location of the firstconducting track. This defect extends over at least a part of the first conducting region. In one disclosed embodiment, there are a plurality of conducting tracks and conducting regions defined by the patterned conductive thin film.