Ion Mobility Spectrometer Solid-State Ion Filter
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Solution Overview
Problem
Conventional ion mobility spectrometers are limited in miniaturization due to the need for drift gas flows and high voltages, which restricts their size, robustness, and suitability for portable and harsh environments, especially in detecting explosives and chemical agents.
Innovation Solution
A field asymmetric ion mobility spectrometer design that eliminates the need for drift gas flows by using electric fields to propel ions, allowing for a solid-state construction with fewer moving parts, reduced size, and lower voltage operation, enabling more integrated and customizable detection of multiple analytes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional TOF ion mobility spectrometry is used with a drift tube, then detection resolution is improved, but device size increases and miniaturisation is restricted
Solution Approach 1:
The patent replaces the mechanical drift tube system with an electric field-based ion mobility filter. Instead of using a long physical drift tube to separate ions, the invention uses controlled electric fields to manipulate ion trajectories and achieve separation in a compact volume, eliminating the need for a lengthy mechanical drift tube structure.
Solution Approach 2:
The invention changes the operating parameters by using high electric field strengths to achieve ion separation in a short distance. By varying electric field parameters (strength, direction, timing) rather than relying on long drift paths, the system achieves high-resolution detection in a miniaturized form factor.
2Volume of moving object
If high electric field strengths are used to achieve effective ion separation in a short drift tube, then device size is reduced, but voltage requirements increase and potential hazard to operators increases
Solution Approach 1:
The patent divides the high voltage requirement into multiple lower voltage stages. Instead of applying one high voltage across a short distance, the electric field is generated through multiple electrode pairs that sequentially manipulate ions. Each electrode operates at a lower voltage, but the cumulative effect achieves the necessary ion separation and control.
Solution Approach 2:
The invention introduces intermediate electrode structures that mediate between the high voltage requirement and safety concerns. These electrodes create localized electric fields that achieve ion manipulation without requiring the entire device to operate at hazardous voltage levels, distributing the voltage stress across multiple isolated components.
3Measurement precision
If conventional FAIMS with moving gas flows is used, then ion mobility separation is achieved, but device complexity increases due to need for pumps and diaphragms
Solution Approach 1:
The patent replaces the mechanical gas flow system (pumps, diaphragms, flow channels) with an electric field-based ion transport system. Ions are moved and separated through controlled electric fields rather than being carried by moving gas flows, eliminating all mechanical flow-generation components.
Solution Approach 2:
The invention extracts and removes the gas flow generation subsystem from the FAIMS device. By achieving ion mobility separation through electric fields alone, the patent eliminates the need for pumps, diaphragms, and associated flow control mechanisms, significantly reducing device complexity.
4Adaptability or versatility
If miniaturised spectrometers are deployed for covert use and large scale distribution, then portability and robustness are improved, but manufacturing and integration complexity increases
Solution Approach 1:
The patent designs the ion mobility filter with universal electrode structures that can detect multiple different analytes by varying electric field parameters. The same physical device serves multiple detection functions, eliminating the need for different specialized devices for different applications, thereby simplifying manufacturing and distribution.
Solution Approach 2:
The invention enables a single miniaturized device to perform multiple detections by changing electric field parameters (strength, waveform, timing) rather than requiring physical reconfiguration. This parameter-based adaptability simplifies manufacturing since the hardware remains the same while the detection capability is adjusted through controlled parameter changes.
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
This design results in a more robust, sensitive, and power-efficient spectrometer capable of detecting trace levels of ions quickly, with reduced false positives and the ability to operate in various environments, facilitating covert and large-scale deployment.
Implementation Method 1
a first drive electric field is generated along the length of the ion channel
Implementation Method 2
a second transverse electric field is generated orthogonal to the first
Implementation Method 3
an ionizer, an ion filter, and an ion detector
Data Source
AI summary
An ion mobility spectrometer is described having an ion filter in the form of at least one ion channel having a plurality of electrodes. A time-varying electric potential applied to the conductive layers allows the filler to selectively admit ion species. The electric potential has a drive and a transverse component, and in preferred embodiments each of the electrodes is involved in generating a component of both the drive and transverse fields. The device may be used without a drift gas flow, Microfabrication techniques are described for producing microscale spectrometers, as are various uses of the spectrometer.