Passive Airborne Particle Sampler Using Natural Flow and Electret Filters
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Solution Overview
Problem
Existing passive samplers have low sampling efficiency for micron-sized aerosol particles and require power sources or are cumbersome for personal use, making them unsuitable for collecting smaller particles like single spore bacteria and clusters, especially in environments without electricity.
Innovation Solution
A passive aerosol sampler utilizing a cylindrical or spherical body with strategically placed air holes to harness natural air currents for enhanced diffusion and electrostatic collection of airborne particles, equipped with filters that can be attached to a person or moving objects, utilizing HEPA filters and electret filters for improved collection efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If passive sampling is used for micron-sized aerosol particles, then the sampler is lightweight and power-free for personal use, but the sampling efficiency is low
Solution Approach 1:
The patent changes the physical parameters of the sampling surface by introducing electrostatic charge (electret filter) and optimizing the proximity of the collection surface to the air holes. This increases the electrostatic attraction force on micron-sized particles, thereby improving sampling efficiency without requiring active pumping mechanisms.
Solution Approach 2:
The patent transitions from relying solely on natural diffusion (three-dimensional random motion) to incorporating electrostatic field effects (adding a new dimensional force field). The electret filter creates an electrostatic dimension that actively attracts particles, enhancing collection efficiency while maintaining passive operation.
2Quantity of substance
If passive sampling surfaces are placed on the floor to collect particles by settling, then larger particles can be collected, but smaller particles such as single spore bacteria and small clusters cannot be efficiently collected
Solution Approach 1:
The patent changes the collection mechanism from gravity-based settling to electrostatic attraction. The electret filter generates strong electrostatic fields that can capture even the smallest particles (single spore bacteria and clusters) by attracting them to the charged collection surface, regardless of their mass or settling velocity.
Solution Approach 2:
The patent creates a localized high-electrostatic-field region at the collection surface through the electret filter. This concentrated electrostatic effect in the immediate vicinity of the air holes provides enhanced capture capability for small particles that would otherwise pass through or settle too slowly.
3Productivity
If HEPA filters are used to collect particles, then filtration efficiency is high, but the filter clogs quickly and requires frequent replacement
Solution Approach 1:
The patent concentrates the particle capture function at the immediate collection surface (electret filter) rather than throughout a thick filter medium. This localized electrostatic attraction captures particles before they can penetrate deep into the filter structure, reducing overall filter loading and extending service life while maintaining high collection efficiency.
Solution Approach 2:
The patent changes the collection mechanism from mechanical interception and impaction (HEPA filter) to electrostatic attraction (electret filter). This parameter change allows particles to be captured on the surface without requiring them to pass through dense filter media, reducing clogging and extending filter lifespan.
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 sampler significantly increases the collection efficiency of micron-sized particles by leveraging natural air flows, providing a lightweight and power-free method for personal use, capable of collecting smaller particles effectively in various environments.
Implementation Method 1
The passive sampler increases the sampling efficiency for diffusion and electrostatic collection of particles by bringing the particles closer to the deposition surface
Implementation Method 2
The passive sampler increases the sampling efficiency for diffusion and electrostatic collection of particles by bringing the particles closer to the deposition surface
Data Source
AI summary
An apparatus for passive sampling of airborne particles such as those found in an aerosol is disclosed. The passive sampler is designed to take advantage of natural air flow to collect airborne particles, such as those contained in an aerosol, for subsequent analysis. The passive sampler increases the sampling efficiency for diffusion and electrostatic collection of particles by using natural airflow or movement to bring particles closer to the deposition surface. Alternately charged electret filters further increase the sampling efficiency.