Electromagnetic Sensor Housing for Conductivity Measurement
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Solution Overview
Problem
Conventional electromagnetic sensors face challenges in stably measuring electric conductivity and resistivity when solid matters are mixed in the sample solution, as the electrodes are prone to breakage due to direct exposure to the solution.
Innovation Solution
The design includes a substrate with a through hole and a housing that covers the electrode, allowing the sample solution to flow into the housing and contact the electrode, reducing exposure and potential breakage, while also minimizing the amount of sample solution required and enabling thinner sensor units.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the electrode is directly exposed to the sample solution flow inside the housing, then the measurement of electric conductivity is enabled, but the electrode is prone to breakage due to contact with solid matters
Solution Approach 1:
The patent introduces an intermediary structure (housing with controlled opening) between the electrode and the sample solution flow. The housing allows the electrode to remain protected while still enabling measurement by controlling how the sample solution contacts the electrode, thus mediating between protection and measurement functionality.
Solution Approach 2:
The housing acts as a protective shell that covers the electrode while allowing controlled interaction with the sample solution. This shell structure protects the electrode from direct exposure to solid matters in the flowing sample solution, reducing breakage risk while maintaining measurement capability.
2Reliability
If the housing covers the electrode completely, then the electrode is protected from breakage, but the sample solution cannot contact the electrode for measurement
Solution Approach 1:
The housing provides complete coverage and protection for the electrode except for a specific local area (the opening) where measurement is required. This local quality approach allows the electrode to be protected in most areas while maintaining measurement capability at the specific contact point with the sample solution.
3Adaptability or versatility
If multiple sensors are mounted on the substrate with protruding housings, then various measurements can be performed, but the amount of sample solution required increases
Solution Approach 1:
The patent merges multiple sensor functions into a single integrated housing structure mounted on the substrate. By combining multiple measurement capabilities (electric conductivity sensor and ISFET electrode) within one housing unit, the design reduces the total sample solution volume required compared to having separate protruding housings for each sensor type.
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 configuration stabilizes the measurement of electric conductivity and resistivity, reduces the risk of electrode breakage, minimizes sample solution usage, and allows for more sensors to be measured simultaneously with less sample, while also simplifying calibration and improving measurement accuracy, especially in low-concentration samples.
Implementation Method 1
an electromagnetic sensor for measuring electric conductivity, resistivity, dielectric constant, and the like of a sample solution
Data Source
Figure 1
Figure 2(a)~2(b)
Figure 3
AI summary
Provided is an electromagnetic sensor capable of stably measuring electric conductivity and the like even in the case where solid matters are mixed in a sample solution. The electromagnetic sensor includes a substrate, a through hole formed in the substrate, an electrode attached to a surface of the substrate, and a housing that covers the through hole and the electrode, and in this configuration, the sample solution supplied to a surface of the substrate opposite to the surface of the substrate having the electrode attached thereto is allowed to flow into the housing from the through hole and to be accommodated in the housing, so that the sample solution is allowed to be in contact with the electrode.