Turbo Pump Speed Control for Mass Spectrometer Pressure Tuning
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Solution Overview
Problem
Mass spectrometers face challenges in maintaining optimal pressure levels for different types of molecules, leading to issues such as long ion flight times and degraded detector performance due to fixed pressure settings, and existing solutions like pressure sensors and gas regulators increase complexity and cost.
Innovation Solution
A pump management system dynamically adjusts the speed of a turbo pump based on the operating mode and conditions of the mass spectrometer to optimize pressure levels, eliminating the need for additional hardware.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If pressure levels are increased to cool larger ions, then ion cooling effectiveness is improved, but ion flight times increase and spectral acquisition rates decrease
Solution Approach 1:
The patent applies dynamics by making the turbo pump speed variable rather than fixed. The system dynamically adjusts pump speed based on the operating mode and molecule size being analyzed. For larger ions, the pump runs at lower speeds to maintain higher pressure for effective cooling. For smaller molecules, the pump increases speed to reduce pressure and minimize ion flight time, thereby resolving the contradiction between ion cooling effectiveness and spectral acquisition rate.
2Device complexity
If fixed pressure settings are used, then system simplicity is maintained, but performance is degraded for different molecule types
Solution Approach 1:
The patent applies parameter changes by modifying the operating parameters of the existing turbo pump (speed) based on the analysis requirements. The pump management system adjusts pump speed as a variable parameter according to the operating mode and molecule size, enabling optimal performance for different analytical conditions without adding complex hardware pressure control systems.
3Adaptability or versatility
If dedicated pressure control hardware is added, then pressure adjustment capability is improved, but system complexity and cost increase
Solution Approach 1:
The patent applies universality by making the existing turbo pump perform multiple functions through variable speed operation. The single turbo pump system is designed to handle different pressure requirements for various molecule types by adjusting its speed, replacing the need for dedicated pressure control hardware such as separate sensors and gas regulators. This multi-functional approach maintains adaptability while reducing system complexity.
4Speed
If turbo pump runs at high speed, then pressure levels are reduced for small molecule analysis, but ion cooling effectiveness decreases
Solution Approach 1:
The patent resolves this contradiction through dynamic adjustment of turbo pump speed based on the specific analytical requirements. When analyzing small molecules, the pump operates at high speed to achieve low pressure and fast spectral acquisition. When analyzing larger ions that require cooling, the pump reduces speed to maintain higher pressure for effective ion cooling. This dynamic operation allows the system to optimize for either speed or cooling depending on the analytical needs.
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 optimizes pressure levels for various molecular analyses, enhancing spectral acquisition rates and ion detector performance while reducing system complexity and cost.
Implementation Method 1
A turbo pump may operate to remove gas molecules from a region of the mass spectrometer, thereby decreasing pressure within the region to extremely low levels required for accurate mass analysis
Data Source
AI summary
A pump management system may determine an operating mode for a mass spectrometer; set, based on the operating mode, a pump speed of a turbo pump used to create one or more vacuum stages for the mass spectrometer; and cause the turbo pump to operate at the pump speed while the mass spectrometer operates in accordance with the operating mode. Additionally or alternatively, the pump management system may monitor, using one or more instruments external to the turbo pump, a condition associated with the mass spectrometer while the mass spectrometer operates in accordance with the operating mode; determine, based on the monitoring, that the condition changes by more than a threshold value; and adjust, based on the condition changing by more than the threshold value and while the mass spectrometer is in operation, the pump speed.