Sulfurization Detection Resistor with Selective Resin Coatings
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Solution Overview
Problem
Conventional sulfurization detection sensors face challenges in accurately detecting sulfurization due to subtle color changes, requiring large equipment and being influenced by temperature variations, making it difficult to predict disconnection timing in electronic components exposed to sulfide gases.
Innovation Solution
A sulfurization detection resistor with a rectangle-shaped insulating substrate, paired front electrodes, sulfurization detection conductors, and a sulfide gas impermeable protective film, where sulfurization detection units are selectively covered with sulfurization rate adjustment layers to vary resistance values stepwise, allowing for accurate detection of sulfurization levels.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a sulfurization detector mainly including Ag is used to detect sulfurization, then the detection can be performed, but the color change is subtle and difficult to detect visually, and the resistance value variation is very small
Solution Approach 1:
The patent applies local quality by creating sulfurization detection conductors with different sulfurization rates through selective coating with sulfurization rate adjustment layers. Some detection conductors are covered with resin layers that slow sulfurization, while others remain exposed or have different coating thicknesses, creating locally differentiated sulfurization rates. This allows the system to produce measurable resistance changes at different thresholds, making sulfurization detection visually and electrically observable.
Solution Approach 2:
The patent changes the parameter of sulfurization rate by introducing resin layers with different properties (thickness, material composition, permeability) as coating layers on the sulfurization detection conductors. This parameter change creates a gradient of sulfurization rates across different detection conductors, transforming the subtle uniform sulfurization into differentiated, measurable resistance changes at various sulfurization stages.
2Measurement precision
If Ag-based sulfurization detection conductors are used, then sulfurization can be detected, but temperature variation causes large resistance changes that mask the sulfurization-induced resistance changes
Solution Approach 1:
The patent segments the sulfurization detection function into multiple independent detection conductors with different sulfurization rates. Each conductor is coated with resin layers of different thicknesses or materials, creating a series of detection thresholds. This segmentation allows the system to detect sulfurization at multiple stages, providing reliable detection that is not masked by temperature variations, as the cumulative resistance change pattern across multiple conductors reveals sulfurization progression despite temperature fluctuations.
Solution Approach 2:
The patent applies preliminary action by pre-coating sulfurization detection conductors with resin layers before exposure to the sulfurization environment. These pre-applied coating layers control the sulfurization rate in advance, creating predetermined detection thresholds. This preliminary preparation ensures that when sulfurization occurs, the resistance changes follow a predictable pattern that can be distinguished from temperature-induced variations.
3Measurement precision
If conventional sulfurization detection sensors are used, then sulfurization can be detected, but large-scale equipment is required for light-based detection
Solution Approach 1:
The patent replaces the optical/mechanical detection system (light sources, lenses, large-scale equipment) with an electrical detection system. By measuring resistance changes in the sulfurization detection conductors, the system achieves sulfurization detection through simple electrical measurements that can be performed with standard multimeters or integrated into circuit boards, eliminating the need for large-scale optical equipment while maintaining detection accuracy.
4Measurement precision
If all sulfurization detection conductors are exposed to sulfide gas, then sulfurization detection is possible, but disconnection timing cannot be controlled or varied
Solution Approach 1:
The patent applies local quality by creating sulfurization detection conductors with different sulfurization rates through selective coating with sulfurization rate adjustment layers. Some detection conductors are covered with resin layers that slow sulfurization, while others remain exposed or have different coating thicknesses, creating locally differentiated sulfurization rates. This allows the system to produce measurable resistance changes at different thresholds, making sulfurization detection visually and electrically observable.
Solution Approach 2:
The patent introduces dynamics by creating a system where sulfurization detection conductors have varying sulfurization rates, enabling the disconnection timing to be controlled and varied based on the cumulative amount of sulfurization. This dynamic behavior allows different conductors to disconnect at different times, providing adaptable detection across various sulfurization stages and conditions.
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 easy and accurate detection of sulfurization levels by varying resistance values in response to cumulative sulfurization, delaying or advancing disconnection timing based on the type of resin used in the adjustment layers, thereby preventing unexpected failures.
Implementation Method 1
Silver becomes silver sulfide when exposed to a sulfide gas and, since the silver sulfide is an insulator
Implementation Method 2
a sulfide gas impermeable protective film that covers all of the resistors and some of the sulfurization detection conductors
Implementation Method 3
by selectively covering the sulfurization detection units with a sulfurization rate adjustment layer, timing of disconnection is set so as to vary in response to a cumulative amount of sulfurization
Data Source
AI summary
A sulfurization detection resistor includes: a rectangle-shaped insulating substrate; pair of front electrodes formed at both ends facing each other on a surface of the insulating substrate; plurality of sulfurization detection conductors arranged in parallel between the paired front electrodes; plurality of resistors connected between the ends of each of the sulfurization detection conductors and the paired front electrodes; and sulfide gas impermeable protective film that covers all of the resistors and some of the sulfurization detection conductors, wherein each of the sulfurization detection conductors has a sulfurization detection unit exposed from a window hole in the protective film; and by covering the sulfurization detection units with different types of sulfurization rate adjustment layers formed of an acrylic resin, a silicon resin, and the like, timing of disconnection is set so as to vary in response to a cumulative amount of sulfurization in each of the sulfurization detection units.