Multidimensional Dynode Detector for Mass Spectrometry
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Solution Overview
Problem
Conventional quadrupole mass spectrometry systems face a trade-off between high mass resolving power and sensitivity, often requiring slow scan rates and expensive detection components, which limits their practicality and efficiency.
Innovation Solution
A mass spectrometer system that measures ion current as a function of both time and spatial displacement at the exit aperture of a quadrupole instrument, using a detector with multiple dynodes to deconvolve spatial and temporal information, allowing for high sensitivity and mass resolving power without the need for expensive microchannel plates or high-speed photodetectors.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If narrow mass stability limits are used to improve mass resolving power, then mass resolving power is enhanced, but sensitivity deteriorates because only a small fraction of stable ions reach the detector
Solution Approach 1:
The patent transitions from single-point temporal detection to two-dimensional spatio-temporal detection by recording ion arrival positions across the detector surface. This dimensional expansion allows simultaneous measurement of multiple ion parameters, enabling high mass resolving power through spatial distribution analysis while maintaining high sensitivity by capturing all arriving ions regardless of their specific arrival position.
2Measurement precision
If conventional single-point detectors are used, then device complexity is low, but the ability to resolve spatial and temporal ion characteristics is limited
Solution Approach 1:
The detector is segmented into multiple independent detection elements arranged across the detector surface, with each element capable of recording ion arrivals independently. This segmentation enables spatial resolution of ion trajectories while maintaining the simplicity of conventional detector technology at each individual element level.
3Measurement precision
If expensive microchannel plates or high-speed photodetectors are used to achieve high sensitivity and mass resolving power, then detection performance is improved, but device cost and complexity increase
Solution Approach 1:
The patent uses multiple copies of simple, conventional detector elements arranged in an array across the detector surface. Each element is a straightforward detection component, but their collective arrangement and the analysis of their combined spatio-temporal signals achieve the high performance previously requiring expensive specialized detectors.
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
The system achieves higher sensitivity and mass resolving power at faster scan rates than conventional systems, with the ability to differentiate ions with mass deltas of up to 1 ppm, while maintaining high sensitivity and operational efficiency using conventional detector components.
Implementation Method 1
detecting ions as a function of time and relative spatial displacement in the beam cross-section
Implementation Method 2
Ions are separated in a quadrupole mass filter based on the stability of their trajectories in the oscillating electric fields that are applied to the rods
Implementation Method 3
deconvolution of the spatial and temporal characteristics collected at the exit aperture of a quadrupole instrument
Data Source
Figure 1A~1B
Figure 2A
Figure 2B
AI summary
A mass spectrometer is described that includes a multipole configured to pass an ion stream, the ion stream comprising an abundance of one or more ion species within stability boundaries defined by (a, q) values. A detector formed by a plurality of dynodes is configured to detect the spatial and temporal properties of the abundance of ions, where each dynode arranged such that it is struck by ions in a known spatial relationship with the ion stream. The detector also includes a plurality of charged particle detectors, each associated with one or more of the plurality of dynodes. A processing system is configured to record and store a pattern of detection of ions in the abundance of ions by the dynodes in the detector.