FT Mass Analyzer Dynamic Voltage Tuning for Resolving Power
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Solution Overview
Problem
Traditional methods for tuning Fourier Transform (FT) mass analyzers, such as orbital electrostatic trap and FTICR systems, optimize voltages based on high-stress scenarios, which may not be applicable for lower resolving power settings commonly used in practice, leading to suboptimal performance in terms of peak coalescence threshold and isotope ratio fidelity.
Innovation Solution
A method for storing optimized voltage values for multiple resolving power settings, allowing for selective voltage control based on the chosen setting to maximize peak coalescence threshold while maintaining acceptable isotope ratio fidelity, thereby improving performance metrics at lower resolving power settings.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If voltage optimization is performed for high-stress scenarios (highest resolving power settings), then resolving power and signal-to-noise ratio are improved, but peak coalescence threshold and isotope ratio fidelity deteriorate at lower resolving power settings
Solution Approach 1:
The patent implements dynamic tuning by making voltage settings adjustable based on the selected resolving power setting. Instead of fixed voltages optimized for high-stress scenarios, the system dynamically selects from multiple pre-determined voltage sets corresponding to different resolving power levels (e.g., 120,000, 240,000, 500,000, 1,000,000). This allows the system to adapt voltage parameters to match the actual operating conditions, resolving the contradiction between optimizing for maximum resolving power while maintaining reliability at lower settings.
Solution Approach 2:
The patent changes the voltage parameters applied to analyzer electrodes based on the selected resolving power setting. Multiple sets of optimized voltage values are stored in memory, each set tailored for specific resolving power levels. When a user selects a particular resolving power setting, the corresponding voltage set is automatically applied, thereby optimizing peak coalescence threshold and isotope ratio fidelity for that specific operating condition rather than relying on a single high-stress optimized configuration.
2Device complexity
If a single set of optimized voltages is used for all resolving power settings, then device complexity is reduced, but performance optimization is lost for lower resolving power settings
Solution Approach 1:
The patent applies preliminary action by pre-calculating and storing multiple sets of optimized voltage values for different resolving power settings during the tuning process. These pre-determined voltage sets are saved in memory associated with each resolving power setting. When the instrument operates, the system simply retrieves and applies the appropriate pre-optimized voltage set based on the selected resolving power, avoiding the need for complex real-time calculations while maintaining optimal performance across all settings.
Data Source
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AI summary
A method of operating a Fourier Transform (FT) mass analyzer, which has a plurality of selectable resolving power settings, includes storing an optimized voltage value in association with each one of the plurality of selectable resolving power settings. More particularly, the optimized voltage values for at least two of the selectable resolving power settings differ from one another. When a user selects one of the plurality of selectable resolving power settings, the optimized voltage value that is stored in association therewith is retrieved. At least one voltage setting of the FT mass analyzer is controlled, based on the retrieved optimized voltage value, and an analytical scan is performed at the selected one of the plurality of selectable resolving power settings for a population of ions within the FT mass analyzer.