Inorganic Humidity Sensor Device High-Temperature Stability
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Solution Overview
Problem
Conventional humidity sensors using organic polymer materials face degradation at high temperatures, complex manufacturing processes, and slow response times, making them unsuitable for harsh environments and efficient humidity sensing.
Innovation Solution
An inorganic humidity sensor device featuring a semiconductor bulk substrate with an inorganic dielectric layer and interdigitated electrodes, manufactured using mass production semiconductor techniques, which resists high temperatures and provides sub-second response times.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If organic polymer material is used for humidity sensing, then the sensor can detect humidity through water absorption/adsorption, but the material degrades at high temperatures and has slow response times
Solution Approach 1:
The patent changes the material parameter from organic polymer to inorganic dielectric material, which fundamentally alters the thermal stability and chemical resistance properties. This parameter change enables the sensor to withstand high temperatures and harsh chemical environments while maintaining sensing functionality through alternative mechanisms like capacitance measurement.
Solution Approach 2:
The patent replaces the chemical absorption/adsorption mechanism of organic polymers with an electrical measurement mechanism using inorganic dielectric materials. The humidity sensing is achieved through measuring changes in capacitance or impedance of the inorganic layer, substituting chemical interaction with electrical field interaction for enhanced stability.
2Productivity
If conventional polymeric humidity sensor devices are used, then humidity sensing is achieved, but response times are relatively low (of the order of seconds)
Solution Approach 1:
The patent replaces the slow diffusion-based water absorption mechanism of polymers with rapid electrical field response of inorganic dielectric materials. The capacitance or impedance changes occur almost instantaneously in response to humidity changes, eliminating the time delay inherent in polymer water uptake and enabling sub-second response times.
3Reliability
If inorganic and organic material layers are combined in the manufacturing process, then humidity sensing functionality is achieved, but the overall manufacturing process becomes relatively complex
Solution Approach 1:
The patent extracts and removes the organic polymer layer from the sensor structure, retaining only the inorganic dielectric material. This extraction simplifies the manufacturing process by eliminating the need for organic material deposition and handling while preserving the essential humidity sensing functionality through the inorganic layer's electrical property changes.
Solution Approach 2:
The patent changes the material composition parameter from a composite inorganic-organic structure to a purely inorganic structure. This parameter change simplifies the manufacturing process by reducing the number of material layers and processing steps required, while the inorganic material's inherent properties maintain the sensing capability.
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 inorganic humidity sensor device offers improved durability, simplified manufacturing, and rapid response times, enabling reliable humidity sensing across a wide range (0% to 100%) in high-temperature and high-pressure environments.
Implementation Method 1
a sensitive polymeric layer for absorption and/or adsorption of water
Implementation Method 2
a sensitive polymeric layer for absorption and/or adsorption of water
Data Source
AI summary
A humidity sensor device includes a substrate and a pair of interdigitated electrodes formed over the substrate.