Ion Mobility Spectrometer Gas Circulation and Purification
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Solution Overview
Problem
Ion mobility spectrometry devices face limitations in qualitative and quantitative detection due to interference from complex matrices like water vapor in the detection environment, affecting their sensitivity and accuracy.
Innovation Solution
An ion mobility spectrometer device with a sampling and circulating gas path that includes a solid sample desorption device and a gas sampling device, allowing for the introduction of mixed gases into the ion mobility tube for detection, and incorporating a circulation system to filter and recycle gases, enhancing the device's ability to handle various samples and improve detection accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If ion mobility spectrometry is used for detection, then portability and fast response are improved, but qualitative and quantitative ability are limited due to interference from complex matrices like water vapor
Solution Approach 1:
The gas path is divided into multiple independent segments: sampling gas path, circulating gas path, and purification gas path. Each segment handles specific functions (sampling, circulation, purification) separately, allowing the system to maintain fast response while removing interfering substances like water vapor through dedicated purification components
Solution Approach 2:
A circulating gas acts as an intermediary medium that carries samples through the system while being continuously purified. The circulation system introduces purified gas to displace and remove interfering matrix substances, thereby improving measurement precision without sacrificing the fast response capability of IMS
2Measurement precision
If a circulation system is added to filter and recycle gases, then detection accuracy and sensitivity are improved, but device complexity increases
Solution Approach 1:
The sampling gas path and circulating gas path are merged into a unified system where the same gas circulation loop serves both sampling and purification functions. This integration reduces the need for completely separate systems, thereby improving detection accuracy while limiting the increase in device complexity
Solution Approach 2:
The circulating gas path performs multiple functions: it transports samples, purifies gases through filtration, and maintains positive pressure in the ion mobility tube. This multi-functionality allows a single circulation system to achieve improved detection accuracy without requiring multiple separate complex subsystems
3Adaptability or versatility
If solid sample desorption device is used to process solid samples, then ability to detect high-boiling substances is improved, but device complexity increases
Solution Approach 1:
The solid sample desorption device utilizes phase transition (sublimation or evaporation) to convert solid high-boiling substances into gas phase for detection. By heating the solid sample in the desorption device, it transitions to vapor that can be carried by the circulating gas into the ion mobility tube, thereby improving adaptability to detect high-boiling substances while using a relatively simple heating mechanism
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 improved sensitivity and accuracy in detecting a wide range of samples, including high-boiling substances and toxic gases, by effectively managing the gas circulation and purification, reducing external environmental interference and extending the device's operational stability and sensitivity.
Implementation Method 1
a circulation filter configured to remove water vapor and other interfering substances from the gas
Implementation Method 2
a pump configured to drive the gas out of the ion mobility tube and flow in the gas path
Data Source
AI summary
Embodiments of the present disclosure provide an ion mobility spectrometer device. The ion mobility spectrometer device includes: an ion mobility tube, a sampling device, and a sampling and circulating gas path. The sampling device includes a solid sample desorption device and a gas sampling device. The solid sample desorption device is configured to process the solid sample into a first mixed gas containing the solid sample, and the gas sampling device is configured to process the gas sample into a second mixed gas containing the gas sample. The sampling and circulating gas path is configured to transfer the first mixed gas and/or the second mixed gas into the ion mobility tube for detection.