Volatile Organic Compound Sensing Device Using Segmented Capture Degrees
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Solution Overview
Problem
Existing sensing devices cannot identify specific types of volatile organic compounds (VOCs) such as alcohols, ketones, and benzenes, limiting their application in various environments.
Innovation Solution
A sensing device with a substrate and units configured as reference resistors and sensing units, where at least one sensing unit has different capture degrees for polar and nonpolar gases, or protic and aprotic gases, allowing for the determination of VOC types based on voltage changes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If existing sensing devices are used to detect volatile organic compounds, then the presence of VOCs can be sensed, but the specific types of VOCs (such as alcohols, ketones, and benzenes) cannot be identified
Solution Approach 1:
The sensing device is divided into multiple sensing units (at least two), where each unit has different capture degrees for different types of VOCs. This segmentation allows the system to differentiate between VOC types by comparing the responses of individual units, thereby achieving precise identification without requiring complex additional components.
Solution Approach 2:
Each sensing unit is designed with distinct local properties, specifically different capture degrees for polar and nonpolar gases, or protic and aprotic gases. This local quality differentiation enables each unit to respond uniquely to specific VOC types, allowing the system to identify VOC types based on the pattern of responses across units.
2Measurement precision
If multiple sensing units with different capture degrees are used to identify VOC types, then VOC type identification is enabled, but the device complexity increases
Solution Approach 1:
The sensing units are designed to perform multiple functions: they can detect different types of VOCs (polar vs. nonpolar, protic vs. aprotic) using the same basic sensing structure. This multi-functionality reduces the need for completely separate sensing systems for different VOC types, thereby limiting the increase in device complexity while maintaining high identification accuracy.
Solution Approach 2:
The invention utilizes changes in capture degree parameters of the sensing units to differentiate VOC types. By measuring voltage changes that result from different capture degrees, the system can identify VOC types without adding complex structural elements, thus achieving precise identification with minimal increase in device complexity.
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 effective identification of VOC types, enhancing the device's application in various electronic devices by differentiating between VOCs based on capture degrees and resistance changes.
Implementation Method 1
at least one of the first sensing unit and the second sensing unit has different capture degrees for polar gas and nonpolar gas of the volatile organic compounds
Implementation Method 2
The index of gas compound (Indexgas) of the volatile organic compounds is determined by the voltage change in the sensing device
Data Source
AI summary
A sensing device and a sensing method are provided. The sensing device includes a substrate, a first unit, a second unit, a third unit, and a fourth unit. The first unit and the second unit are disposed on the substrate and connected to each other in series. The third unit and the fourth unit are disposed on the substrate and connected to each other in series. Of the first unit, the second unit, the third unit, and the fourth unit, two are reference resistors, and the other two are a first sensing unit and a second sensing unit configured to capture volatile organic compounds. At least one of the first sensing unit and the second sensing unit has different capture degrees for polar gas and nonpolar gas of the volatile organic compounds and/or has different capture degrees for protic gas and aprotic gas of the volatile organic compounds.