ELIT Charge Detector Reset for Low-Noise Ion Separation
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Solution Overview
Problem
Charge detection instruments, particularly electrostatic linear ion traps (ELIT), face challenges in accurately measuring ion mass-to-charge ratios due to high uncertainty and noise interference, limiting the range of valid charge measurements.
Innovation Solution
Incorporating a charge generator to produce free charges that are directed into a field-free region and deposited onto a charge detection cylinder, calibrating or resetting it to a target charge level, thereby improving the accuracy of charge measurements by reducing noise and extending the range of detectable charges.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If multiple passes of ions through charge detection cylinder are used to reduce measurement uncertainty, then measurement precision improves, but noise interference increases making it difficult to distinguish valid charges from detector noise
Solution Approach 1:
The charge generator performs preliminary action by depositing a controlled number of charges onto the charge detection cylinder before ion measurement begins. This pre-charging establishes a known baseline charge state, allowing the system to distinguish between charges from ions and spurious charges from detector noise. The preliminary charging action enables subsequent measurements to reference this known state.
Solution Approach 2:
The system changes the charge parameter of the detection cylinder by using the charge generator to deposit specific numbers of charges (e.g., 0, 1, 2, or more charges) onto the cylinder. This parameter change creates distinct charge states that can be differentiated from noise, transforming the detection cylinder from a neutral state to a controlled charged state for improved signal discrimination.
2Adaptability or versatility
If charge detection range is extended to measure lower charge signals, then adaptability improves, but measurement reliability deteriorates due to approaching noise floor
Solution Approach 1:
Before extending the detection range to lower charge signals, the system performs preliminary charging of the detection cylinder with known numbers of charges. This preliminary action creates a reference framework that allows reliable detection even when ion signals approach the noise floor, as the system can distinguish between pre-deposited charges and incoming ion charges.
Solution Approach 2:
The charge generator creates copies of charge units by depositing identical, controlled numbers of charges onto the detection cylinder. These copied charges serve as known references that can be reliably distinguished from noise, enabling the system to extend its detection range while maintaining reliability through comparison against these charge copies.
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 enhances the precision of charge detection by reducing noise interference and expanding the range of measurable charges, leading to more reliable ion mass-to-charge ratio determinations.
Implementation Method 1
a charge generator for generating free charges, and a field free region between the charge generator and the charge detection cylinder
Data Source
AI summary
A CDMS may include an ion source to generate ions from a sample, a mass spectrometer to separate the generated ions as a function of ion mass-to-charge ratio, an electrostatic linear ion trap (ELIT) having a charge detection cylinder disposed between first and second ion mirrors, wherein ions exiting the mass spectrometer are supplied to the ELIT, a charge generator for generating free charges, a field free region between the charge generator and the charge detection cylinder, and a processor configured to control the charge generator, with no ions in the charge detection cylinder, to generate a target number of free charges and cause the target number of free charges to travel across the field-free region and into contact with the charge detection cylinder to deposit the target number of free charges thereon and thereby calibrate or reset the charge detection cylinder to a corresponding target charge level.