Valveless Gas Sampling Apparatus for Rapid Trace Analyte Detection
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Solution Overview
Problem
Current methods for detecting trace chemical substances in gas samples, such as ion mobility spectrometry and gas chromatography, often require extensive time and complex setups, limiting their ability to provide rapid and efficient analysis, especially in applications like homeland security where quick detection is crucial.
Innovation Solution
A compact apparatus that includes a pump, a concentrating element coated with methyl-phenylsilicones, and a chromatographic separator, allowing for rapid streaming of gas samples and carrier gases in opposing directions, with heating elements to release analytes quickly, enabling detection cycles to be completed in under a minute.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If ion mobility spectrometry or gas chromatography is used to detect trace chemical substances, then detection sensitivity is improved, but analysis time and system complexity increase
Solution Approach 1:
The patent extracts and eliminates valves from the gas sampling system, creating a valveless apparatus that directly couples the concentration element to the chemical detector. This removal of unnecessary components reduces system complexity and eliminates valve-related delays in gas flow, enabling faster analysis while maintaining detection sensitivity through direct coupling of the concentrating element to the detector.
Solution Approach 2:
The patent implements a concentration element that pre-concentrates analytes from the gas sample before detection. This preliminary concentration action occurs continuously in the sampling line, allowing the system to maintain high sensitivity for trace detection while reducing the time required for actual analysis, as the concentration process occurs in parallel with sampling rather than requiring separate pre-concentration steps.
2Measurement precision
If ion mobility spectrometry or gas chromatography is used to detect trace chemical substances, then detection sensitivity is improved, but device complexity increases
Solution Approach 1:
The patent removes valves and complex gas flow control mechanisms from the system, creating a simplified valveless apparatus. The gas sampling line is directly coupled to the concentration element and detector without intermediate control components, reducing device complexity while maintaining the ability to achieve high detection sensitivity through the concentration element's direct integration.
Solution Approach 2:
The patent merges the concentration element directly with the gas sampling line and detector, creating an integrated system where the concentration function is built into the sampling pathway itself. This integration eliminates the need for separate pre-concentration devices and complex valve systems, reducing overall device complexity while maintaining high detection sensitivity.
3Speed
If rapid gas streaming is implemented, then analysis speed is improved, but detection sensitivity may deteriorate
Solution Approach 1:
The concentration element performs preliminary concentration of analytes from the gas sample as it flows through the sampling line. This pre-concentration action occurs continuously during sampling, allowing the system to handle rapid gas streaming while maintaining detection sensitivity, as the concentration process is integrated into the fast flow pathway rather than requiring slow, deliberate sampling.
Solution Approach 2:
The patent implements continuous concentration of analytes along the gas sampling line through the concentration element, rather than using discrete batch processing steps. This continuous action allows the system to maintain high detection sensitivity even during rapid gas streaming, as the concentration process occurs continuously throughout the sampling period rather than requiring pauses or slow flow rates.
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 enables rapid detection of chemical substances, reducing false alarms and improving operational throughput, with the ability to detect analytes like explosives in seconds, and maintaining high sensitivity and specificity.
Implementation Method 1
a chamber (160) configured to receive a gas sample stream and containing a concentrating element for collecting at least one analyte from the gas sample stream
Implementation Method 2
a heating element for heating the metallic concentrator so as to release the at least one analyte from the metallic concentrator
Implementation Method 3
a pump for drawing said gas sample from ambient air via said first inlet/ outlet and said chamber in a first direction
Implementation Method 4
a chromatographic separator connected to the second end of the passage
Data Source
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AI summary
An apparatus for detecting a presence of at least one analyte in a gas sample. The apparatus comprises a pump for drawing a gas sample from an ambient air, a passage having first and second ends, a chamber connected to the first end and containing a concentrating element for collecting at least one analyte from the gas sample, a chromatographic separator connected to a second end of the passage, and a gas source for streaming a carrier gas via the chamber to transfer the at least one analyte toward at least one chemical detector, via the chromatographic separator, in a first direction. The pump draws the gas sample via the chamber in a second direction and the first and second directions are substantially opposing to one another.