Movable Sieve Preconcentration for Ion Mobility Spectrometry
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Solution Overview
Problem
Existing ion mobility detection methods face challenges in achieving high detection sensitivities and efficiencies due to the trade-off between providing a larger contact area for adsorption and obtaining higher volatilization concentration during desorption, leading to degraded detection precision and efficiency.
Innovation Solution
A pre-concentration device with a sieve and desorption units, where the sieve is movable between absorption and desorption positions, utilizing heating barrels with internal and external heating members to enhance volatilization concentration, and a driving mechanism for automatic switching between adsorption and desorption operations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If a larger contact area is provided during adsorption to enhance adsorption abilities, then the adsorption capacity is improved, but the volatilization concentration during desorption becomes lower
Solution Approach 1:
The patent employs a movable sieve that can dynamically change its configuration between a spread-out state during adsorption (maximizing contact area) and a rolled-up state during desorption (concentrating the adsorbed substances). This dynamic transformation allows the system to optimize for both adsorption capacity and detection sensitivity at different operational stages, resolving the contradiction between large contact area and high volatilization concentration.
2Quantity of substance
If separate gas pre-concentration processing and gas sampling steps are employed, then adsorption ability is enhanced, but detection efficiency is degraded due to repeated steps
Solution Approach 1:
The patent integrates the pre-concentration and sampling functions into a single unified device. The movable sieve serves dual purposes: it acts as an adsorption medium for pre-concentration and simultaneously functions as the sampling interface for detection. By combining these separate steps into one integrated system, the patent eliminates the need for repeated operational steps while maintaining effective substance concentration, thereby resolving the contradiction between enhanced adsorption ability and degraded detection efficiency.
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 improves detection sensitivities and efficiencies by allowing a larger adsorption area while ensuring high volatilization concentration during desorption, facilitating more effective detection of substances like drugs and explosives.
Implementation Method 1
a heating barrel including a heating unit to heat the sieve received therein and wound on the sieve drum
Implementation Method 2
at least one desorption unit configured to desorb the substances to be detected that have been absorbed to the sieve
Implementation Method 3
a sieve provided, in a deployed state, within the collecting passage and configured to separate the substances to be detected from the gas mixture, and absorb the separated substances thereto
Data Source
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AI summary
The present invention belongs to the technical field of ion mobility detection application, and relates to a pre-concentration device and method for an ion mobility detection apparatus. According to an aspect of this invention, there is provided a pre-concentration device for an ion mobility detection apparatus, comprising: a collecting passage configured to collect a gas mixture including substances to be detected; a sieve provided, in a deploy state, within the collecting passage and configured to separate the substances to be detected from the gas mixture, the separated substances to be detected being absorbed to the sieve; at least one desorption unit configured to desorb the substances to be detected that have been absorbed to the sieve, the sieve being received in a wound state in the desorption unit; and a driving device configured to drive movement of the sieve between an absorption position in which the substances to be detected are absorbed to the sieve in the collecting passage, and a desorption position in which the substances to be detected are desorbed from the sieve in the at least one desorption unit.