Valve Assembly Isolates Drift Tube in Trace Detector Feeding
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Solution Overview
Problem
Commercially available trace detectors, such as ion mobility spectrometers, suffer from reduced sensitivity due to the use of semi-permeable membranes, which have a low permeation ratio, leading to sample molecule loss and increased operation power consumption, and instability in detection due to environmental pollution of the drift region.
Innovation Solution
A sample feeding device with a valve assembly and sealing member that isolates the sample feeding chamber from the drift tube, allowing for improved sample permeation and maintaining a clean internal environment by controlling communication between the chambers, eliminating the need for a semi-permeable membrane.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a semi-permeable membrane is used to isolate the drift tube from the outside environment, then the cleanness of the drift tube interior is improved, but the sensitivity of the detector is reduced due to low permeation ratio
Solution Approach 1:
The sample feeding device is divided into two separate chambers: a first sample feeding chamber that communicates with the drift tube and a second sample feeding chamber that receives samples from outside. This segmentation allows the drift tube to remain isolated and clean while samples are prepared in the second chamber, eliminating the need for a semi-permeable membrane and improving both sensitivity and reliability
Solution Approach 2:
A valve assembly acts as an intermediary mechanism between the two chambers, controlling the communication between them. The valve assembly includes a sealing member that can be separated from a flange to allow sample transfer, or brought into contact to isolate chambers. This intermediary device enables selective communication while maintaining the clean environment in the first chamber
2Reliability
If a semi-permeable membrane is used to protect the drift tube, then the stability of detection operation is improved, but the operation power is increased due to additional heating requirements
Solution Approach 1:
By segmenting the sample feeding process into two separate chambers, the first chamber maintaining a stable, clean environment for drift tube communication while the second chamber handles sample intake and preparation, the system achieves detection stability without requiring additional heating components, thus reducing power consumption
Solution Approach 2:
The valve assembly serves as an intermediary that allows the system to maintain environmental stability without continuous heating. The sealing member can be selectively engaged or disengaged from the flange to control chamber communication, providing stability through mechanical isolation rather than thermal management
3Device complexity
If the drift region is in direct communication with the atmosphere, then the device complexity is reduced by eliminating the semi-permeable membrane, but the background peak becomes complex and detection stability is degraded
Solution Approach 1:
The device uses chamber segmentation to maintain a simple overall structure without semi-permeable membranes, while the first sample feeding chamber acts as an intermediate buffer zone that prevents direct atmospheric contamination of the drift tube, thus maintaining detection stability with reduced complexity
Solution Approach 2:
The valve assembly with sealing member and flange serves as a simple mechanical intermediary that controls communication between chambers. This straightforward mechanism prevents atmospheric pollution without requiring complex semi-permeable membrane structures, achieving both simplicity and reliability
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 solution enhances detector sensitivity and stability by ensuring more sample molecules enter the drift tube, maintaining a clean internal environment, and reducing power consumption, thereby improving the consistency and accuracy of substance detection.
Implementation Method 1
a valve assembly configured to fluidly communicate the sample feeding chamber with a drift tube of the trace detector during feeding sample... by bringing the sealing member into contact with the flange
Implementation Method 2
a sample feeding chamber disposed in the sample feeding device to desorb a sample from a sample feeding member
Data Source
AI summary
A sample feeding device for a trace detector is disclosed. The sample feeding device comprises: a sample feeding chamber disposed in the sample feeding device to desorb a sample from a sample feeding member; and a valve assembly configured to fluidly communicate the sample feeding chamber with a drift tube of the trace detector during feeding sample. With the above configuration of the present invention, for example, the sensitivity of the detector can be increased by improving the permeation ratio of the sample. In addition, interior environment of the drift tube is isolated from exterior environment to avoid a drift region of the drift tube from being polluted. The important parameters, such as sensitivity, a position of a peak of a substance, a resolution, of the detector can be kept constant. As a result, operation reliability and consistency of the detector can be achieved.