Trace Detector Sampling Substrate Indirect Heating
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Solution Overview
Problem
Existing sample processing methods for trace detectors involve direct heating of sampling substrates, which leads to interference and difficulty in finding materials with high collection efficiency and temperature resistance.
Innovation Solution
A sample processing system and method that uses a sheet-shaped sampling substrate made of materials like Dacron, high density polyethylene, or nylon, which transfers collected substances to a metal film or mesh sample feeding part within the trace detector, allowing for detection without direct heating of the substrate.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If direct heating of sampling substrate is used to evaporate sample, then sample release efficiency is improved, but interference substances are released and detection accuracy deteriorates
Solution Approach 1:
The system divides the heating function from the sampling substrate. The substrate collects samples without direct heating, while a separate heater component processes the substrate indirectly through heated air flow, separating sample collection from sample release functions
Solution Approach 2:
Heated air acts as an intermediary medium to transfer thermal energy to the sampling substrate indirectly. The heater generates hot air that flows over the substrate, causing sample evaporation without direct contact between the heating element and substrate, thereby avoiding interference substance release
2Temperature
If high temperature resistance material is selected for sampling substrate, then temperature resistance is improved, but collection efficiency and material cost deteriorate
Solution Approach 1:
The system separates the sampling function from the heating function. The sampling substrate can be made of materials optimized for collection efficiency rather than temperature resistance, since it is not directly heated. The heater component handles the thermal processing separately
Solution Approach 2:
Heated air serves as an intermediary that transfers thermal energy without requiring the substrate to withstand direct high temperatures. This allows use of materials with lower temperature resistance but higher collection efficiency
3Speed
If direct heating of sampling substrate is used, then sample evaporation speed is improved, but material selection range and cost effectiveness deteriorate
Solution Approach 1:
Heated air acts as an intermediary medium that provides rapid evaporation without direct contact heating. This allows use of a broader range of materials including those that cannot withstand direct heating, expanding material selection while maintaining fast evaporation speeds
Solution Approach 2:
The system changes the heating method from direct contact to indirect heating via air flow. This parameter change allows substrates to be made from materials optimized for sampling performance rather than thermal resistance, expanding material options
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 approach reduces interference, increases efficiency and speed of sample collection and preparation, and allows for the selection of materials with good sampling performance and lower costs, while enabling storage and further analysis of suspicious samples.
Implementation Method 1
heated by a heater (3) therein to release (evaporate) the sample
Data Source
AI summary
A sample processing system and a sample processing method for a trace detector are disclosed. The system comprises a sampling substrate for collecting a substance or substances from the surface of an object to be tested by contacting the sampling substrate with the surface of the object, and a trace detector. The trace detector includes a sample feeding device provided with a sample feeding part. The substance collected by the sampling substrate can be transferred to a surface of the sample feeding part so that the substance transferred to the surface of the sample feeding part can be detected. With the configuration of some embodiments of the present invention, a sampling substrate made of chemical fiber is used to collect a sample from the surface of an object to be tested by contacting the sampling substrate with the surface of the object to be tested. The sample collected by the sampling substrate is mechanically transferred to a metal film or mesh of the sample feeding device of the trace detector. Then, the metal film or mesh of the sample feeding device is heated to vaporize the sample and to release the sample vapor into the trace detector. Therefore, the efficiency of sample collection and desorption processes can be improved. In addition, the direct heating of a sampling substrate can be avoided so as to decrease the interference of the sampling substrate with trace detection.