Ion Migration Tube Potential Well for Ion Packet Compression

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Solution Overview

Problem

Conventional ion migration tubes suffer from low resolution due to ions entering the migration region with different flight speeds, leading to wide spectral peak half-widths, which limits the effectiveness of ion mobility spectrometers in applications such as explosive detection and chemical warfare agent screening.

Innovation Solution

The ion migration tube design incorporates an ion gate with specific potential configurations, including a first and second ion gate grid and migration region electrodes, forming a potential well to compress ion groups when opened, and maintaining consistent or reversed pulse potentials to control ion flow, ensuring sufficient ion entry and compression without leakage.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Adaptability or versatility

If ions enter the migration region with different flight speeds, then ion mobility spectrometer can detect multiple ion types, but spectral peak half-width increases and resolution deteriorates

Engineering Contradiction:

Improveion detection capabilityVSAvoidspectral resolution

Core Design Contradiction:

Adaptability or versatilityVSMeasurement precision

Solution Approach 1:

The ion gate applies a pre-compression voltage before ions enter the migration region, compressing the ion packet spatially. This preliminary action reduces the initial spatial distribution of flight speeds, allowing ions to enter the migration region with more uniform velocities, thereby improving spectral resolution while maintaining multi-ion detection capability

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The ion gate voltage is dynamically changed from a compression voltage (when closed) to an acceleration voltage (when open). This parameter change controls the ion packet's spatial distribution and velocity distribution, enabling the system to achieve both high resolution and versatile ion detection by adjusting the voltage parameter at different operational phases

Inventive Principle:

Principle #35Parameter changes

2Reliability

If ion gate is opened to allow ion flow, then ion detection sensitivity is maintained, but ion leakage occurs reducing measurement precision

Engineering Contradiction:

Improveion detection sensitivityVSAvoidion packet control accuracy

Core Design Contradiction:

ReliabilityVSMeasurement precision

Solution Approach 1:

The ion gate operates in periodic cycles, alternating between closed (compression) and open (acceleration) states. During the closed state, ions are compressed; during the open state, the compressed ion packet is accelerated into the migration region. This periodic action ensures complete ion transfer without leakage while maintaining detection sensitivity, as the gate fully opens only after compression is complete

Inventive Principle:

Principle #19Periodic action

Solution Approach 2:

The ion gate voltage is dynamically adjusted based on the operational phase: high compression voltage when closed, then transitions to acceleration voltage when open. This dynamic voltage control ensures that ions are fully contained during compression and then fully transmitted during acceleration, eliminating ion leakage while maintaining sensitivity

Inventive Principle:

Principle #15Dynamics

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 configuration enhances the resolution of the ion mobility spectrometer by compressing ion groups, reducing ion leakage, and maintaining sensitivity, resulting in improved spectral resolution by 5-10% compared to conventional configurations.

Implementation Method 1

when the ion gate is opened, a potential well is formed for ionized ions between the first ion gate grid and the first migration region electrode so as to compress an ion group entering the migration region

Methodology Applied

Scientific EffectPotential well: Potential Well

Implementation Method 2

the ion gate disposed between the ionization region and the migration region comprises a first ion gate grid having an absolute value of potential V2 and a second ion gate grid having an absolute value of potential V3

Methodology Applied

Scientific EffectElectric field: Electric Field

Implementation Method 3

matters enters the ion migration tube from one end of the ionization region, are ionized within the ionization region and then are driven by an electric field to enter the migration region

Methodology Applied

Scientific EffectIonization: Ionisation

Data Source

PatentEP3343215B1Ion migration tube for an ion mobility spectrometer and method of operating the same

Publication Date: 2023.11.08 NUCTECH CO LTD

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Figure 3~4

AI summary

The present disclosure provides an ion migration tube and a method of operation the same. The ion migration tube includes an interior space and an ion gate disposed within the interior space, the interior space includes an ionization region having an absolute value of potential V1 and a migration region. An ion gate is disposed between the ionization region and the migration region and includes a first ion gate grid having an absolute value of potential V2 and a second ion gate grid having an absolute value of potential V3, the migration region comprises at least a first migration region electrode having an absolute value of potential V4 and a second migration region electrode having an absolute value of potential V5. When the ion gate is opened, a potential well is formed for ionized ions between the first ion gate grid and the first migration region electrode so as to compress an ion group entering the migration region.