Humidity Sensing Element Electrode Geometry Optimization
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Solution Overview
Problem
Existing humidity sensing technologies face challenges in achieving a simpler structure while maintaining sensitivity and effectively measuring humidity, with previous solutions either complicating the sensor design or requiring further modifications for improved sensitivity.
Innovation Solution
A humidity sensing element with an insulation section made of a hydrophilic insulating material, featuring an application electrode and an output electrode with a specific inter-electrode width and total electrode length configuration, allowing for a change in capacitance that is greater than a predetermined value in response to humidity, enabling more sensitive and precise humidity measurement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a poisoning prevention layer and protective layer are added to the humidity sensor, then the sensor's reliability is improved, but the device structure becomes complicated and thicker
Solution Approach 1:
The patent extracts and eliminates the poisoning prevention layer and protective layer from the sensor structure, relying instead on the inherent stability of the insulating material with controlled porosity to prevent poisoning and provide protection, thereby simplifying the overall structure while maintaining reliability
Solution Approach 2:
The insulating material serves multiple functions simultaneously: it provides the sensing function through its porosity that allows water molecule adherence, while also providing structural stability and resistance to poisoning, replacing the need for separate protective and anti-poisoning layers
2Measurement precision
If the inter-electrode width is reduced to increase sensitivity, then the measurement precision is improved, but the manufacturing precision requirements become more stringent
Solution Approach 1:
The patent changes the porosity parameter of the insulating material to optimize the sensing performance, allowing for a balance between sensitivity and manufacturing tolerances by adjusting the material's physical properties rather than relying solely on precise geometric dimensions
Solution Approach 2:
The patent applies different porosity values to different regions or uses specific porosity ranges for specific sensing conditions, allowing optimization of sensitivity in critical areas while maintaining manufacturability in other regions
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 solution enables a wider dynamic range of humidity measurement, improving sensitivity and precision, and allowing for more accurate detection of humidity levels.
Implementation Method 1
an insulation section made of an insulating material... water molecules adhering to a surface of the insulating material
Implementation Method 2
an amount of change in capacitance produced between the application electrode and the output electrode with respect to humidity
Data Source
AI summary
Disclosed is a humidity sensing element that includes an insulation section made of an insulating material, an application electrode to which a voltage is applied, and an output electrode which outputs a voltage signal corresponding to an electrical current flowing through an electrical path via water molecules adhering to a surface of the insulating material in response to the voltage applied to the application electrode. A distance between the application electrode and the output electrode is equal to or greater than a predetermined value, and/or a total sum of lengths of portions where the application electrode and the output electrode face each other is less than a predetermined value.