Multi-Pole Ion Transmission Control for Noding Loss Reduction
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Solution Overview
Problem
Multi-pole charged particle analysis systems face issues with inadvertent omission of charged particles from analysis due to angular deviation caused by noding effects, leading to incomplete spectra and reduced transmission efficiency.
Innovation Solution
Controlling the AC voltage source in multi-pole charged particle transmission devices by varying the frequency, amplitude, or waveform shape of the applied AC voltage to adjust the trajectories of charged particles, thereby reducing angular deviation and enhancing transmission efficiency across a range of mass-to-charge ratios.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If a multi-pole device is used to filter charged particles with a wide range of mass-to-charge ratios, then the device can transmit only charged particles having a reduced range of mass-to-charge ratios, but this causes inadvertent omission of exiting charged particles from analysis
Solution Approach 1:
The patent applies dynamic control of the AC voltage parameters (frequency, amplitude, waveform shape) to the multi-pole device. By dynamically adjusting these parameters, the device can adapt its transmission characteristics to minimize angular deviation and noding effects while maintaining the desired mass-to-charge ratio filtering, thus preventing omission of charged particles from analysis
Solution Approach 2:
The patent changes physical parameters of the AC voltage applied to the multi-pole device, specifically frequency, peak amplitude, and waveform shape. These parameter changes allow optimization of particle transmission by reducing angular deviation and distributing transmission losses evenly across the mass-to-charge ratio range, thereby improving both the range transmitted and the completeness of detection
2Productivity
If the AC voltage parameters are changed to adjust particle trajectories, then angular deviation is reduced and transmission efficiency is enhanced, but the device complexity increases
Solution Approach 1:
The patent makes the AC voltage source multi-functional by enabling it to operate with different frequencies, amplitudes, and waveform shapes. This single device performs multiple functions (filtering different mass-to-charge ratios, minimizing angular deviation, reducing noding effects) through parameter variation, avoiding the need for multiple separate control systems and thereby managing complexity while enhancing transmission efficiency
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 approach minimizes the noding effect, ensuring more uniform detection of charged particles across the mass-to-charge range, reducing extraneous peaks, and improving the accuracy of generated spectra by distributing transmission losses evenly.
Implementation Method 1
controlling an AC voltage source to apply an AC voltage... to the rods of the multi-pole charged particle transmission device
Implementation Method 2
angular deviation caused by noding effects
Implementation Method 3
varying the frequency, amplitude, or waveform shape of the applied AC voltage to adjust the trajectories of charged particles
Data Source
AI summary
A method is provided for controlling a multi-pole charged particle transmission device having rods spaced apart radially about a central axis extending from a particle inlet at one end of the device to a particle outlet at an opposite end. An AC voltage source is controlled to apply an AC voltage having a frequency, a peak amplitude, and a waveform shape to the charged particle transmission device, and a set of charged particles is passed through the device under such conditions. The AC voltage source is then controlled to change at least one of the frequency, peak amplitude or shape of the AC, and another set of the charged particles is then passed through the charged particle transmission device under such conditions.