Wire Electrode Ion Transmission Device for Simultaneous Polarity Handling
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Solution Overview
Problem
Current mass spectrometers face challenges in efficiently transmitting and detecting both positive and negative ions due to high ion loss caused by gas pressure differences, limited miniaturization of multi-polar poles, and reduced detection sensitivity, especially when switching between ion polarities.
Innovation Solution
A device with low capacitance metal wire electrodes and a specific electric field configuration allows for simultaneous storage and transmission of both positive and negative ions, using a radial alternating electric field and an axially confined electric field to minimize ion loss and power consumption, while enabling rapid ion cooling and detection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a quadrupole, hexapole or octopole with solid electrode structure is used to form a radial pseudo-potential well, then ion transmission is improved, but the capacitance increases and power requirements increase
Solution Approach 1:
The patent replaces solid electrode structures with thin wire electrodes that form the multi-polar field. These wire electrodes have much smaller surface area and capacitance compared to solid electrodes, reducing power requirements while maintaining the radial pseudo-potential well function for ion transmission
Solution Approach 2:
The patent changes the physical parameters of the electrodes from solid structures with large surface area to thin wire structures with small surface area. This parameter change reduces capacitance and power consumption while preserving the essential electric field configuration needed for ion transmission
2Measurement precision
If voltages are switched to accumulate ions of one polarity, then detection sensitivity for that polarity is improved, but detection time increases
Solution Approach 1:
The patent merges the transmission paths for positive and negative ions by using a multi-polar field configuration that can simultaneously accommodate both ion polarities. By applying appropriate voltage patterns to the multi-polar electrodes, both positive and negative ions can be transmitted through the same device without requiring sequential switching, thus reducing detection time while maintaining sensitivity
Solution Approach 2:
The patent employs dynamic voltage control of the multi-polar electrodes to selectively guide different ion polarities. The voltage pattern can be dynamically adjusted to transmit positive ions, negative ions, or both simultaneously, enabling flexible and rapid switching between detection modes without the delays associated with traditional accumulation methods
3Power
If the gap and diameter of ion transmission guiding electrodes are reduced, then RF power requirements are reduced and ion transmission efficiency is improved, but the multi-polar pole becomes difficult to miniaturize due to deformation
Solution Approach 1:
The patent uses thin wire electrodes instead of rigid solid electrodes for the multi-polar structure. These thin wires are more flexible and easier to miniaturize without suffering from deformation issues. The wire structure can be bent and shaped to achieve the required geometric configuration at smaller scales while maintaining structural integrity and electric field quality
Solution Approach 2:
The patent employs curved and angled wire electrode configurations to achieve the multi-polar field geometry. The wires can be arranged at specific angles and curved to create the desired electric field distribution, allowing miniaturization while avoiding the deformation problems associated with reducing the diameter of rigid cylindrical multi-polar structures
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 solution enhances ion transmission efficiency, reduces power requirements, and allows for higher gas pressures, improving detection sensitivity and range by enabling simultaneous storage and transmission of both ion polarities, while maintaining a stable electric field and efficient ion cooling.
Implementation Method 1
applying an AC voltage to a plurality of wire electrodes to form a radial alternating electric field for confining a radial movement of ions
Implementation Method 2
applying a pulsed DC or AC voltage to an axial field electrode to form an axially confined electric field for preventing ions from escaping in an axial direction
Implementation Method 3
an ion source for providing ions
Data Source
AI summary
The present application relates to an ion transmission device, more particularly, to a device and method for generating, storing and transmitting positive and negative ions. The device includes a wire electrode, a perforated insulating board, a tensioning device, an axial field electrode and an ion source for providing ions. The generated positive and negative ions are respectively stored on two ends of a cavity by the device; and the positive or negative ions are led out as needed. The utilization efficiency of positive and negative ions, as well as sensitivity, are greatly improved by the device.