Ion Mobility Spectrometer Drift Tube Using PPS Plastic
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Solution Overview
Problem
Conventional ion mobility spectrometers are costly to produce and have low analytical efficiency, especially when operated at temperatures above 150° Celsius, due to the use of expensive and complex materials like ceramic and metal components.
Innovation Solution
The use of high-performance plastics, such as polyphenylene sulfide (PPS), for the main body of the drift tube and ion source region, which can be manufactured through injection molding, allowing for a cost-effective and efficient production of miniaturized ion mobility spectrometers capable of operating at high temperatures.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If ceramic rings and metal electrodes are used for the drift tube, then the spectrometer can operate at high temperatures, but the manufacturing cost and device complexity increase significantly
Solution Approach 1:
The patent changes the material parameter from traditional ceramic and metal to high-performance plastic (PPS), which maintains thermal stability up to 220°C while simplifying the overall device structure and reducing manufacturing complexity
Solution Approach 2:
The patent uses composite construction by integrating the drift tube body and electrodes into a single injection-molded plastic component with embedded conductive elements, combining structural support and electrical functionality in one material system
2Strength
If ceramic rings and metal electrodes are firmly joined by hard-soldering, then the structural strength is sufficient, but the manufacturing cost and production complexity increase
Solution Approach 1:
The patent merges the drift tube body and electrode structures into a single integrated component manufactured by injection molding, eliminating the need for separate assembly steps and hard-soldering processes while maintaining structural integrity
Solution Approach 2:
The patent replaces the mechanical assembly process (hard-soldering of separate ceramic and metal parts) with a single-step injection molding process that creates the entire structure including embedded conductive elements
3Weight of moving object
If the spectrometer is miniaturized for portable devices, then the weight and size are reduced, but maintaining high temperature operation becomes more difficult
Solution Approach 1:
The patent changes the material properties by selecting PPS plastic with specific thermal characteristics that maintain structural stability at 220°C while enabling miniaturized dimensions and reduced weight compared to traditional ceramic constructions
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 implementation of high-performance plastics enables the creation of small, lightweight, and cost-effective ion mobility spectrometers that maintain high analytical efficiency and can be operated at temperatures up to 220° Celsius, suitable for portable devices and improved sensitivity in pollutant detection.
Implementation Method 1
The ion mobility spectrometer is operated at temperatures of up to 200° Celsius and higher to prevent the deposition of pollutants on the interior walls
Implementation Method 2
Molecules of the pollutants are ionized by the radiation of a radioactive substance (3), such as 63Ni, for example
Implementation Method 3
Electrical DC potentials on the metal electrodes (6) generate an axial electric field, which drives ions through the drift gas located inside the tube
Data Source
AI summary
The invention relates to the material, design and manufacture of a drift tube with an ion source region, particularly a miniaturized drift tube, for an ion mobility spectrometer to measure mobility spectra, particularly at atmospheric pressure. The invention proposes to use a high-performance plastic which can be injection-molded for the insulating main body for the drift tube and the ion source region. Polyphenylene sulfide (PPS) can be used for this purpose, for example.