Small Area Electrostatic Aerosol Collector Design
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Solution Overview
Problem
Current technologies for monitoring and analyzing airborne bioaerosols are inefficient in collecting and concentrating particulates onto a sample substrate, particularly in small-scale applications, and often require significant power consumption.
Innovation Solution
A small area electrostatic aerosol collector is designed with a charging device that creates an electric field to charge particles, using a high voltage power source and a sample substrate with a collection surface held at a neutral or opposite charge, positioned in close proximity to the electric field, to attract and collect aerosol particles efficiently within a small area.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If conventional aerosol collection methods are used, then particulates can be collected on a sample substrate, but the collection efficiency is low and power consumption is high
Solution Approach 1:
The patent replaces conventional mechanical filtration systems with an electrostatic collection system. A charging device creates an electric field that charges aerosol particles, which are then attracted to and deposited on a collection substrate held at a different electrical potential. This electrostatic mechanism achieves high collection efficiency without the high power consumption associated with mechanical filtration systems.
Solution Approach 2:
The patent changes the electrical parameters of the collection system by applying high voltage to the charging device and controlling the electrical potential of the collection substrate. By adjusting these electrical parameters, the system achieves optimal particulate collection efficiency while maintaining low power consumption, as the electrostatic forces are significantly stronger than gravitational or inertial forces alone.
2Quantity of substance
If large area collection substrates are used, then more particulates can be collected, but the device size and complexity increase
Solution Approach 1:
The patent creates a highly concentrated electric field in a localized region near the collection substrate. This localized high-field region efficiently charges and collects particulates in a small area, achieving high collection capacity without requiring a large overall device size. The electric field concentration allows effective collection in a compact footprint.
Solution Approach 2:
The patent utilizes the electrical dimension (voltage, electric field strength) to enhance collection efficiency, rather than relying solely on increasing the physical collection area. By operating in this additional dimensional space, the system achieves high particulate collection capacity in a compact device configuration.
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 collector achieves high efficiency in particulate collection with low power consumption, allowing for precise sampling of bioaerosols in small areas, such as ambient air, by utilizing electrostatic forces to deposit particles onto a substrate, thereby enhancing monitoring capabilities in environments like semiconductor clean rooms and healthcare facilities.
Implementation Method 1
a charging device having an electrode; a high voltage power source coupled to the charging device that causes the electrode of the charging device to create an electric field that charges particles in the air flowing past the electrode
Implementation Method 2
particulates are collectable on the collection surface of the sample substrate by containing the aerosol in a small area within the passageway and by forcing the air to flow near the collection surface of the sample substrate such that the charged particles are attracted to the collection surface
Data Source
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AI summary
A small area electrostatic aerosol collector includes a collector housing, an inlet nozzle that extends from the housing and an exit port that provides an exit for air to flow back out of the housing. A pumping arrangement pulls air into the housing through the inlet nozzle. The sampled air is moved through ductwork such that particulates are collected on a substrate and the air is evacuated through the exit port after collection. The collector also includes a charging device positioned within the ductwork so as to create an electric field defining a charging point that the air passes through between the inlet nozzle and the substrate. The substrate is held at a neutral or opposite charge relative to the electric field created by the charging wire. Particulates are collected on the sample substrate by containing the aerosol in a small area and by forcing the aerosol to flow near the substrate.