High-Pressure Mass Spectrometer with Convective Buffer Gas Flow
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Solution Overview
Problem
Conventional mass spectrometers are unsuitable for portable and compact chemical monitoring due to their large size, weight, and high power consumption, making them inadequate for rapid in situ or field measurements.
Innovation Solution
A high-pressure mass spectrometer (HPMS) design featuring a mass analyzer ion trap with an injector and ejector endcap electrode, and a pressure ratio between two chambers configured to generate convective flow of buffer gas, enhancing ion signal peak height by up to 200% compared to operating at a common pressure.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional mass spectrometers are designed for high performance, then measurement precision is improved, but device complexity and size increase making them unsuitable for portable applications
Solution Approach 1:
The mass spectrometer is divided into two separate chambers: a first chamber housing the ion trap mass analyzer operated at high background pressure (0.1-1000 Torr), and a second chamber housing the detector operated at lower pressure. This segmentation allows each chamber to be optimized independently for its specific function, enabling portable design while maintaining detection precision
Solution Approach 2:
The invention changes the operating pressure parameter from conventional high vacuum conditions to high background pressure (0.1-1000 Torr) in the ion trap chamber. This parameter change enables the use of compact components and reduces the need for complex vacuum systems, making the device suitable for portable applications while maintaining measurement capability
2Device complexity
If high background pressure (0.1-1000 Torr) is used in the ion trap chamber, then device complexity is reduced for portable applications, but ion signal intensity decreases
Solution Approach 1:
A differential pressure system acts as an intermediary between the high-pressure ion trap chamber and the low-pressure detector chamber. The pressure gradient (P2/P1 ratio between 0.1 and 1.0) mediates ion transport from the high-pressure region to the low-pressure detector region, maintaining signal intensity while enabling compact portable design
Solution Approach 2:
The invention introduces a pressure dimension gradient between two chambers rather than maintaining uniform pressure throughout. By operating the ion trap at high pressure (0.1-1000 Torr) and the detector at lower pressure with a controlled pressure ratio, the system achieves both portability and signal intensity through three-dimensional pressure management
3Measurement precision
If pressure ratio P2/P1 between chambers is optimized for signal enhancement, then ion signal peak height increases by at least 30%, but device complexity increases due to differential pumping requirements
Solution Approach 1:
The pressure ratio between chambers is made dynamically adjustable rather than fixed, allowing optimization of the P2/P1 ratio (between 0.1 and 1.0) for different analytical requirements. This dynamic control enables signal enhancement of at least 30% while adapting to various measurement conditions without requiring overly complex fixed infrastructure
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 HPMS achieves significant signal enhancement with a peak height increase of at least 30% in detected ion signals, enabling efficient chemical monitoring and analysis in compact and lightweight formats suitable for field applications.
Implementation Method 1
The mass analyzer and pressure ratio P2/P1 can be configured to generate convective flow of buffer gas with a Knudsen value Kn less than 10 to thereby generate gas flow and/or transport in a viscous or transition regime
Implementation Method 2
A ratio of P2/P1 can be less than 1 and greater than about 0.1. P2/P1 can generate an increase in peak height in at least one detected ion signal
Data Source
AI summary
Mass spectrometry systems include an ionizer, mass analyzer and the detector, with a high pressure chamber holding the mass analyzer and a separate chamber holding the detector to allow for differential background pressures where P2<P1 which generates gas flow through an unsealed, sealed or partially sealed ion trap and enhances detected signal relative to when P2=P1.