On-Demand Vapour Generator With Absorption Passages for Leak Control
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Solution Overview
Problem
Existing vapour generators in ion mobility spectrometry (IMS) systems face challenges in rapidly switching between different doping conditions without leakage, as residual vapour often escapes when the generator is turned off, leading to contamination of undoped regions.
Innovation Solution
An on-demand vapour generator design featuring a vapour-permeable passage with a secondary absorption assembly that absorbs vapour when no flow is present, and a pneumatic valve to prevent vapour leakage by maintaining zero flow until needed, ensuring minimal vapour escape when the generator is off.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a conventional vapour generator is used, then vapour can be supplied to the detector, but vapour leakage occurs when the generator is switched off
Solution Approach 1:
A flow generator is introduced as an intermediary component between the vapour chamber and the detector. This mediator controls the gas flow through the vapour chamber, enabling rapid switching between doped and undoped conditions by activating or deactivating the flow, thereby preventing direct vapour leakage when the generator is off
Solution Approach 2:
The vapour supply function is separated from the flow control function. The vapour chamber continuously produces vapour, but the flow generator extracts and controls only the necessary amount of vapour-gas mixture to pass through the permeable passage to the detector, isolating the vapour source from direct exposure to the detector when not in use
2Object-generated harmful factors
If the vapour generator is switched off to prevent leakage, then vapour leakage is reduced, but rapid switching between doping conditions is prevented
Solution Approach 1:
The flow generator acts as a rapid-acting mediator that can be switched on and off quickly to control vapour delivery. By controlling the gas flow rather than the vapour source itself, the system achieves rapid switching between doping conditions without the delays associated with heating/cooling the vapour chamber
Solution Approach 2:
The system transitions from a static vapour supply (where the vapour chamber must be heated/cooled to switch) to a dynamic flow-controlled supply. The flow generator can rapidly adjust the gas flow rate through the vapour chamber, enabling fast switching between different doping conditions while maintaining precise control
3Adaptability or versatility
If a flow generator is added to control vapour flow, then switching between doping conditions is enabled, but device complexity increases
Solution Approach 1:
The flow generator serves multiple functions: it controls the overall vapour delivery to the detector, enables rapid switching between doping conditions, and maintains a steady flow through the permeable passage. By consolidating these control functions into a single component, the increase in complexity is minimized while achieving versatile doping control
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 design allows for rapid and controlled vapour supply to IMS detectors, preventing dopant vapour leakage and enabling selective doping of regions, thereby maintaining detection system integrity and accuracy.
Implementation Method 1
the flow of vapour passes through the first vapour-permeable passage to the passage outlet at least substantially without absorption of vapour from the flow of vapour
Implementation Method 2
when a flow of vapour is not received from the vapour chamber, vapour entering the vapour absorption assembly from the vapour chamber passes into the first vapour-permeable passage and the at least one second vapour-permeable passage and is at least substantially absorbed
Data Source
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AI summary
An on-demand vapour generator includes a vapour chamber configured to produce a vapour and a vapour absorption assembly configured to receive flows of vapour from the vapour chamber. The vapour absorption assembly includes a first vapour-permeable passage having a passage outlet and at least one second vapour-permeable passage that is closed. When vapour absorption assembly receives a flow of vapour from the vapour chamber, the flow of vapour passes through the first vapour-permeable passage to the passage outlet at least substantially without absorption of vapour from the flow of vapour. However, when a flow of vapour is not received from the vapour chamber, vapour entering the vapour absorption assembly from the vapour chamber passes into the first vapour-permeable passage and the at least one second vapour-permeable passage and is at least substantially absorbed.