Differential Resistance Sensor for Temperature-Compensated Humidity Detection
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Solution Overview
Problem
Existing sensors face challenges in improving detection performance, particularly in accurately detecting changes in humidity and temperature, due to parasitic resistance fluctuations caused by environmental conditions.
Innovation Solution
A sensor design featuring a first and second resistance element with distinct parasitic resistance characteristics, where the second element's parasitic resistance is more sensitive to humidity changes, allowing for differential detection to enhance accuracy and cancel temperature dependence.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a single resistance element is used for humidity detection, then the device structure is simple, but temperature fluctuations cause parasitic resistance changes that reduce measurement precision
Solution Approach 1:
The sensor is divided into two distinct resistance elements with different parasitic resistance characteristics. The first resistance element has low parasitic resistance while the second has high parasitic resistance. By segmenting the detection function across these two elements, the patent enables differential measurement that cancels temperature effects while maintaining humidity sensitivity.
Solution Approach 2:
Each resistance element is designed with different local properties - specifically different parasitic resistance values. The first element uses a configuration or material that minimizes parasitic resistance, while the second element is designed to have higher parasitic resistance. This local quality differentiation allows each element to respond differently to temperature and humidity changes, enabling precise compensation.
2Reliability
If resistance elements with different parasitic resistance characteristics are used, then temperature dependence can be canceled through differential detection, but the device complexity increases
Solution Approach 1:
The patent changes the parasitic resistance parameter of the resistance elements by modifying their physical or electrical characteristics. One element is designed with low parasitic resistance while the other has high parasitic resistance. This parameter differentiation enables the differential measurement technique to effectively cancel temperature dependence while maintaining reliability.
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 high-accuracy humidity detection by leveraging the differential resistance between the first and second elements, reducing the impact of temperature fluctuations and improving overall detection performance.
Implementation Method 1
parasitic resistance fluctuations caused by environmental conditions
Implementation Method 2
The first resistance element includes a first resistance end portion and a first other resistance end portion, both of which are covered with the insulating member
Data Source
AI summary
According to one embodiment, a sensor includes a first sensor part. The first sensor part includes an insulating member, and first and second element parts. The first element part includes a first resistance element including first and first other resistance end portions, and covered with the insulating member, a first electrode electrically connected to the first resistance end portion, and not covered with the insulating member, and a first other electrode electrically connected to the first other resistance end portion, and not covered with the insulating member. The second element part includes a second resistance element including and second other resistance end portions, and covered with the insulating member, a second electrode electrically connected to the second resistance end portion, and not covered with the insulating member, and a second other electrode electrically connected to the second other resistance end portion, and not covered with the insulating member.