Portable Ion Mobility Spectrometer for Low-Vapour Aerosol Detection
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Solution Overview
Problem
Ion mobility spectrometers struggle to detect substances with low vapour pressure in aerosol form due to their inability to vaporize and ionize aerosol particles effectively.
Innovation Solution
The spectrometer is configured to heat the inhaled air sample to vaporize aerosols before ionization, with a controller managing the heating process to enhance sensitivity and efficiency, using a heater in the inlet or a separate chamber to ensure effective desorption and vaporization of aerosol particles.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If ion mobility spectrometers operate by ionizing a sample of gas or vapour, then detection capability is improved, but substances with low vapour pressure in aerosol form cannot be detected
Solution Approach 1:
The patent applies parameter changes by heating the sample to change its temperature parameter, which causes aerosol particles to vaporize and transition from liquid/solid phase to gas phase. This enables the ion mobility spectrometer to detect substances with low vapour pressure that would otherwise remain in aerosol form and be undetectable by the instrument.
Solution Approach 2:
The patent utilizes phase transitions by heating the sample to vaporize aerosol particles, transforming them from liquid or solid phase into gas phase. This phase change allows the substances to be ionized and detected by the ion mobility spectrometer, which can only analyze gaseous or vapour phase samples.
2Measurement precision
If heating is applied to vaporize aerosols, then detection sensitivity is improved, but energy consumption increases
Solution Approach 1:
The patent applies preliminary action by heating the sample before it enters the ionization region. This pre-heating step vaporizes the aerosol particles in advance, ensuring they are in the appropriate phase for ionization and detection, thereby improving sensitivity without requiring excessive energy during the actual measurement process.
Solution Approach 2:
The patent implements periodic action through a controller that manages the heating process in a controlled manner, applying heat only when needed to vaporize aerosols and then reducing or stopping heating. This periodic heating approach maintains detection sensitivity while minimizing overall energy consumption in portable battery-powered devices.
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 allows for the detection of aerosols with low vapour pressure by converting them into vapour form, improving the sensitivity and extending battery life in portable devices by optimizing energy usage through controlled heating.
Implementation Method 1
heating the sample to vapourise aerosols carried by that sample of air before the sample is ionised for analysis
Implementation Method 2
the sample is ionised for analysis
Data Source
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AI summary
A portable ion mobility spectrometry apparatus (1) for detecting an aerosol and a method for using the apparatus. The apparatus comprises an ion mobility spectrometer (3); a portable power source (5) carried by the apparatus for providing power to the apparatus (1); an inlet (7) for collecting a flow of air to be tested by the spectrometer (3); an air mover for drawing the flow of air through the inlet; a heater (4) configured to heat the air to be tested to vaporise an aerosol carried by the air and a controller (2) configured to control the air mover to draw the flow of air through the inlet past the heater, the controller configured to increase a heat output from the heater for a selected time period, wherein the time period is selected to enable substances desorbed from the inlet to leave the inlet; wherein after the selected time period has elapsed, whilst the air mover continues to draw air to be tested for aerosols into the inlet of the spectrometer past the heater, the controller is configured to control the spectrometer to obtain samples from the heated air.