Compact Mass Spectrometer High-Pressure Operation
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Solution Overview
Problem
Conventional mass spectrometers are large, power-hungry, and require trained operators, limiting their portability and practicality for applications like on-the-spot chemical identification, and they are not designed to operate at higher gas pressures due to component limitations.
Innovation Solution
Compact mass spectrometers with a single mechanical pump operating at lower frequencies, capable of maintaining gas pressures between 100 mTorr and 100 Torr, using efficient ion sources and detectors, and providing user-friendly information on chemical substances without the need for high-resolution mass spectra.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional mass spectrometers are used, then high measurement precision is achieved, but device complexity and power consumption increase
Solution Approach 1:
The mass spectrometer is divided into functionally independent modules: ion source module, mass analysis module, and detection module. Each module can be independently optimized and maintained, reducing overall system complexity while preserving measurement precision capabilities.
Solution Approach 2:
The system operates at elevated gas pressures (100-1000 mTorr) compared to conventional ultra-high vacuum systems. This parameter change simplifies the vacuum system requirements, reduces power consumption of vacuum pumps, and enables portable deployment while maintaining sufficient mass spectral resolution through adjusted ion optics and detection parameters.
2Measurement precision
If conventional mass spectrometers are used, then high measurement precision is achieved, but portability deteriorates
Solution Approach 1:
Operating at elevated gas pressures eliminates the need for complex ultra-high vacuum systems, dramatically reducing instrument weight and enabling portability. The ion source and mass analyzer are optimized to function at these pressures, maintaining sufficient measurement precision for field applications.
Solution Approach 2:
The heavy vacuum pump systems and complex vacuum isolation infrastructure are removed from the design. The system accepts ambient air or operates with simple pressure control, extracting the portability-enabling feature by eliminating the primary source of weight and complexity.
3Use of energy by stationary object
If gas pressure is increased to 100-1000 mTorr, then power consumption is reduced, but measurement precision deteriorates
Solution Approach 1:
The system is designed to operate at elevated pressures (100-1000 mTorr) where vacuum pump power consumption is dramatically reduced. Ion optics, electric field configurations, and detection parameters are simultaneously optimized for this pressure regime, achieving sufficient mass spectral resolution (e.g., 0.1-1.0 amu) appropriate for portable field applications without requiring ultra-high precision.
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 compact design reduces power consumption and size, enabling portability and ease of use by non-specialists, while maintaining sufficient resolution for identifying chemical substances, even at higher operating pressures.
Implementation Method 1
The ion source can include a glow discharge ionization source. The ion source can include a capacitive discharge ionization source. The ion source can include a dielectric barrier discharge ionization source.
Implementation Method 2
The gas pressure regulation system can include a gas pump configured to control the gas pressure in the at least two of the ion source, the ion trap, and the ion detector. The gas pump can include a scroll pump.
Data Source
AI summary
Mass spectrometers and methods for measuring information about samples using mass spectrometry are disclosed.