Dual-Inlet Gas Mass Spectrometry With Bellows Pressure Stabilization
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Solution Overview
Problem
Dual-inlet mass spectrometers face inaccuracies and instability due to pressure and flow rate imbalances between sample and standard gases, leading to biased measurements and the need for complex calibrations to correct for gas depletion over time.
Innovation Solution
A pressure-stabilized dual inlet gas mass spectrometer system that continuously monitors and adjusts the internal pressure of bellows using a control system, including a valve, vacuum pump, and air leak, to maintain constant pressure and flow rates, ensuring stable gas delivery to the mass spectrometer.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If pressure and flow rate of sample and standard gases are allowed to differ, then the dual inlet system can operate with simple structure, but the measurements become biased and increasingly inaccurate
Solution Approach 1:
The patent implements a feedback control system where a pressure sensor continuously monitors the pressure in the common bellows, and a control valve automatically adjusts the vacuum pump operation to maintain constant pressure. This closed-loop feedback mechanism ensures measurement accuracy by actively compensating for pressure changes without requiring complex manual calibration procedures
Solution Approach 2:
The system employs self-regulating mechanisms where the control valve and vacuum pump work autonomously to maintain pressure equilibrium between sample and standard gas paths. The bellows design with integrated pressure sensing and control creates a self-correcting system that automatically compensates for gas depletion and pressure variations without external intervention
2Reliability
If pressure stabilization system is implemented, then measurement accuracy is improved, but device complexity increases
Solution Approach 1:
The vacuum pump serves multiple functions: it provides initial vacuum for the mass spectrometer, maintains pressure in the common bellows, and enables pressure stabilization through controlled operation. The control valve integrates pressure regulation and flow control functions, reducing the need for separate components and simplifying the overall control system architecture
Solution Approach 2:
The patent merges the pressure stabilization function into the existing vacuum system by using the vacuum pump and control valve that are already part of the mass spectrometer setup. The common bellows structure combines sample and standard gas containment with pressure sensing capabilities, creating an integrated system that achieves reliability without adding significant complexity
3Measurement precision
If gas flow rates are allowed to vary, then the system can accommodate different gas conditions, but the comparisons between sample and standard become biased
Solution Approach 1:
The patent creates equipotential pressure conditions in the common bellows where both sample and standard gases experience identical pressure environments. By maintaining constant pressure through the control system, the flow rates of both gases are equalized, ensuring that comparisons between sample and standard are not biased by pressure or flow rate differences while still allowing the system to handle various gas types and conditions
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 solution eliminates pressure changes between sample and standard gases, improving the accuracy, consistency, and reliability of measurements by maintaining constant gas flow and pressure, allowing for precise determination of isotope ratios and mole fractions.
Implementation Method 1
The bellows has an internal pressure within the bellows... continuously maintain the internal pressure of the bellows at a constant pressure
Implementation Method 2
The housing is configured to maintain a vacuum around the bellows... The vacuum pump evacuates air from the housing when the valve is open
Data Source
AI summary
A mass spectrometer system for a mass spectrometer is provided. The mass spectrometer system includes a bellows system including a bellows configured to contain a gas and have an internal pressure within the bellows, and a housing configured to surround the bellows. The mass spectrometer system also includes a control system coupled to the bellows system. The control system includes a controller configured to continuously maintain the internal pressure of the bellows at a constant pressure within the bellows and cause, based on the continuous maintaining, delivery of the gas at the constant pressure from the bellows to the mass spectrometer. Related methods and articles of manufacture are also disclosed.