Miniature Mass Spectrometer with Onboard Ion Pump and Nested Analyzer
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Solution Overview
Problem
Conventional mass spectrometers are large, complex, and expensive, consuming significant electrical power, making them unsuitable for portable, remote, or widespread deployment for applications such as air or water quality monitoring, emergency response, or industrial use.
Innovation Solution
A miniature mass spectrometer design featuring a vacuum housing with a low-dielectric strength feedthrough, a compact magnetic sector analyzer, and onboard electronics for power management, allowing operation on minimal power and reducing size and cost, with a focus on handheld deployment and simplified manufacturing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional mass spectrometer design is used, then analytical capabilities are maintained, but device size, complexity, and power consumption increase
Solution Approach 1:
The mass spectrometer is divided into functionally independent modules: ion source, mass analyzer, detector, and vacuum system. Each module can be optimized separately, allowing simplified design while maintaining analytical capabilities. The ion source uses a simple heated filament and electrode configuration rather than complex ionization systems.
Solution Approach 2:
The patent extracts and eliminates unnecessary components from conventional mass spectrometers. The design removes complex voltage multiplication circuits by using direct high-voltage power supply, eliminates complicated ion optics by using simple electrostatic lenses, and reduces the vacuum system to essential components only, thereby reducing device complexity while preserving measurement precision.
2Measurement precision
If conventional mass spectrometer design is used, then analytical capabilities are maintained, but device size increases
Solution Approach 1:
Components are nested within each other to minimize device volume. The mass analyzer electrodes are positioned concentrically around the ion source region, the detector is integrated at the focal point within the existing vacuum chamber, and the vacuum pump is coupled directly to the chamber without intermediate components. This nested arrangement maintains analytical capabilities while significantly reducing overall device size.
Solution Approach 2:
The patent transitions from linear arrangement of components to a compact three-dimensional configuration. The ion source, mass analyzer, and detector are arranged in a compact radial geometry rather than extended linear layout, utilizing vertical and radial spaces efficiently to reduce device footprint while maintaining sufficient ion flight path length for accurate mass analysis.
3Measurement precision
If conventional mass spectrometer design is used, then analytical capabilities are maintained, but power consumption increases
Solution Approach 1:
The mass spectrometer operates using periodic voltage modulation to the mass analyzer electrodes rather than continuous high-voltage application. The ion source filament is pulsed rather than continuously heated, and the detector operates in periodic gating mode, synchronizing with ion arrival. This periodic operation maintains measurement precision by ensuring ions are properly separated and detected while dramatically reducing average power consumption compared to continuous operation.
Solution Approach 2:
The patent optimizes operating parameters to reduce power consumption: using lower filament temperatures sufficient for adequate electron emission, reducing vacuum pressure to minimum required levels, and optimizing mass analyzer voltage waveforms to provide necessary ion separation with minimal energy input. These parameter changes maintain analytical capabilities while reducing power consumption to levels suitable for portable operation.
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 miniature mass spectrometer achieves efficient power usage, reduced size, and lower production costs, enabling widespread deployment for various applications while maintaining sufficient analytical capabilities.
Implementation Method 1
an electron source, disposed within the vacuum cavity, to provide the electron
Implementation Method 2
the electrode controls acceleration of a charged particle propagating through the vacuum cavity
Implementation Method 3
a compact magnetic sector analyzer
Data Source
AI summary
A miniature, low cost mass spectrometer capable of unit resolution over a mass range of 10 to 50 AMU. The mass spectrometer incorporates several features that enhance the performance of the design over comparable instruments. An efficient ion source enables relatively low power consumption without sacrificing measurement resolution. Variable geometry mechanical filters allow for variable resolution. An onboard ion pump removes the need for an external pumping source. A magnet and magnetic yoke produce magnetic field regions with different flux densities to run the ion pump and a magnetic sector mass analyzer. An onboard digital controller and power conversion circuit inside the vacuum chamber allows a large degree of flexibility over the operation of the mass spectrometer while eliminating the need for high-voltage electrical feedthroughs. The miniature mass spectrometer senses fractions of a percentage of inlet gas and returns mass spectra data to a computer.