VOC Detection PID Gas Sensor with Ring Electrodes
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Solution Overview
Problem
Conventional gas sensors for detecting volatile organic compounds (VOCs) have short lifespans and performance variability due to environmental changes such as water content and temperature fluctuations, limiting their effectiveness in precisely sensing ionized gases.
Innovation Solution
A gas sensing device utilizing ring-shaped electrodes to fix a lamp outputting extreme ultraviolet energy, with a configuration including multiple PCBs and sensing electrodes, an insulator, and a specific current application timing to enhance detection efficiency and stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional gas sensors are used for detecting VOCs, then detection capability is provided, but sensor lifespan is short and performance varies with environmental changes
Solution Approach 1:
The patent replaces conventional electrochemical or metal oxide gas sensors with a photoionization detection system that uses ultraviolet light from a lamp to ionize VOC molecules. This substitution of the sensing mechanism eliminates the chemical degradation issues that limit lifespan and environmental sensitivity of conventional sensors, providing stable long-term performance.
Solution Approach 2:
The patent changes the detection parameter from chemical reaction-based signals to electrical current measurements of ionized molecules. By measuring the current generated when UV-ionized VOC molecules are collected by electrodes, the system achieves environmental stability while maintaining detection capability.
2Measurement precision
If conventional gas sensors are used, then basic detection is achieved, but measurement precision varies due to environmental factors
Solution Approach 1:
The patent replaces chemical-based sensing with physical ionization and electrical measurement. The photoionization process and subsequent current measurement are physically stable processes不受 environmental conditions like temperature and humidity, providing consistent measurement precision across varying environments.
Solution Approach 2:
The patent introduces an ultraviolet lamp as an intermediary that converts VOC molecules into ionized species. This intermediary process creates a stable, reproducible detection mechanism where the UV light serves as a consistent energy source that is not affected by environmental variations, ensuring reliable measurement precision.
3Manufacturing precision
If ring-shaped electrodes are used to fix the lamp, then lamp positioning is improved, but device complexity increases
Solution Approach 1:
The ring-shaped electrodes serve multiple functions simultaneously: they provide electrical connections to the lamp, mechanically support and position the lamp with high precision, and act as collection electrodes for ionized molecules. This multi-functionality reduces overall device complexity while achieving precise lamp positioning.
Solution Approach 2:
The patent merges the lamp support structure with the electrical connection and detection electrodes into a single integrated ring-shaped component. This consolidation eliminates separate positioning mechanisms and simplifies the overall device structure while maintaining manufacturing precision for lamp placement.
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 device achieves precise sensing of ionized gases and improves the output efficiency of extreme ultraviolet energy, leading to improved detection of various VOCs with reduced variability under environmental changes, extending sensor lifespan.
Implementation Method 1
a lamp for outputting ultraviolet light
Implementation Method 2
capable of precisely sensing ionized gas based on ring-shaped electrodes which fix a lamp
Data Source
AI summary
Provided according to one embodiment is a device for sensing a gas, comprising: a lamp for outputting ultraviolet light; a first PCB including a hole for inserting the lamp; a second PCB disposed perpendicular to the first PCB and including a lamp power terminal and a lamp ground terminal used to supply power to the lamp; a third PCB disposed parallel to the first PCB, disposed perpendicular to the second PCB, and including a power reception terminal for receiving power from the outside; a first ring-shaped electrode attached to the lamp power terminal and fixing the lamp; and a second ring-shaped electrode attached to the lamp ground terminal, fixing the lamp, and disposed parallel to the first electrode.