Helical Resistive Coil Ion Mobility Spectrometer
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Solution Overview
Problem
Current ion mobility spectrometers face limitations in high throughput analysis, thermal stability, and power consumption, which hinder their effectiveness in detecting thermally labile explosives and require complex mechanical designs that increase costs and reduce performance.
Innovation Solution
A high thermal conductivity ion mobility spectrometer (HTCIMS) with a low thermal mass construction and a simplified design using helical resistive material to create constant electric fields, enabling rapid temperature control and desorption methods, as well as integration with mass spectrometers for enhanced detection capabilities.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If conventional ion mobility spectrometers use traditional drift tube designs with multiple mechanical parts, then structural stability is maintained, but device complexity increases and power consumption rises
Solution Approach 1:
The patent replaces traditional mechanical drift tube components with a resistive coil system that generates electric fields through electrical resistance. The coil is wrapped around a support structure and uses electrical current to create the necessary field gradients, eliminating complex mechanical assemblies while maintaining functional stability through electrical control
Solution Approach 2:
The resistive coil serves multiple functions simultaneously: it generates the electric field for ion mobility separation, provides thermal heating for sample vaporization, and acts as a structural support element. This multi-functionality reduces the number of separate components needed while maintaining system reliability
2Productivity
If samples are heated to elevated temperatures (220-300°C) for vaporization in conventional IMS, then sample introduction efficiency is improved, but thermally labile explosives decompose
Solution Approach 1:
The patent modifies the temperature parameter by using the resistive coil to provide controlled, localized heating that achieves sample vaporization at lower temperatures or for shorter durations. The electrical resistance heating allows precise temperature control that prevents thermal decomposition while maintaining efficient sample introduction
Solution Approach 2:
The resistive coil acts as an intermediary heating element that transfers energy to the sample through the drift gas medium rather than direct contact heating. This indirect heating method through electrical resistance provides more uniform temperature distribution and prevents hot spots that cause decomposition
3Reliability
If conventional IMS systems use complex mechanical designs for drift tube construction, then structural integrity is maintained, but power consumption increases significantly
Solution Approach 1:
The patent substitutes mechanical heating and field generation systems with an electrical resistive coil system. The coil generates both thermal energy through resistive heating and electric fields through applied voltage, eliminating the need for separate mechanical heaters and field generation apparatus, thereby reducing overall power consumption while maintaining structural integrity through the coil's physical presence
Solution Approach 2:
The patent combines multiple functions (heating, field generation, structural support) into a single resistive coil component. This merging of functions reduces the total number of active elements that consume power while the coil's structural role maintains drift tube integrity without requiring additional support mechanisms
4Reliability
If conventional IMS uses traditional sampling and ionization methods, then detection capability is maintained, but throughput is limited and adaptability to different sample types is reduced
Solution Approach 1:
The resistive coil system enables universal sample introduction by providing controlled heating that works for various sample types (solids, liquids, aerosols). The same system can be adjusted for different ionization methods and sampling techniques, increasing throughput by eliminating the need for separate specialized systems while maintaining reliable detection across all sample categories
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 HTCIMS achieves higher sensitivity and selectivity for thermally labile explosives, reduces system downtime, and lowers power consumption, enabling portable and efficient detection systems with improved throughput and detection effectiveness.
Implementation Method 1
The drift tube is constructed with a non-conductive frame, resistance wires, an ion gate assembly, a protective tube, flow handling components, and an ion detector assembly. In some embodiments, single or plural resistance wires are wrapped on the non-conductive frame to form coils in various shapes
Implementation Method 2
the resistance coil generates an even and continuous electric field that guides ions drift through the ion mobility spectrometer. The resistance wires are not only used to form the electric field, they also function as the heating element to heat up the drift tube
Implementation Method 3
Once in the drift region, ions of the sample are separated based upon their ion mobilities. The arrival time of the ions at a detector is an indication of ion mobility, which can be related to ion mass
Data Source
AI summary
The present invention relates to ion mobility spectrometers. In one embodiment, the ion mobility spectrometer of the present invention uses a simplified ion mobility spectrometer design having helical resistive material to form substantially constant electric fields that guide ion movements. The drift tube for ion mobility spectrometers described herein is constructed with a non-conductive structure. This configuration provides a robust ion mobility spectrometer that is simple to build. One feature of the present invention is that the drift tube design described herein enables the ion mobility spectrometer to be built with a lower weight, lower power consumption, lower manufacturing cost, and free of sealants.