Electron Beam Dust Removal for Adhesive Fine Particle Ejection
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing dust mitigation technologies are inadequate for effectively removing dust from surfaces, particularly in extraterrestrial environments, due to the complex balance of cohesive, adhesive, and gravitational forces acting on dust particles.
Innovation Solution
Irradiating dust layers with an electron beam to induce secondary electron emission, creating electrostatic repulsive forces that exceed the balance of forces holding the dust particles to the surface, thereby ejecting them.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If conventional dust mitigation technologies are used, then dust removal is attempted, but fine dust particles remain due to strong adhesive and electrostatic forces
Solution Approach 1:
The patent replaces conventional mechanical dust removal methods (brushes, vacuums, compressed air) with an electron beam-based electrostatic field system. The electron beam creates a non-contact electrostatic force that overcomes the adhesive forces between fine dust particles and surfaces, achieving effective removal of particles as small as 1 micrometer that conventional mechanical methods cannot remove.
Solution Approach 2:
The patent changes the physical state and properties of the dust removal mechanism by using an electron beam to generate electrostatic fields with specific energy levels (80-400 eV) and current densities (0.1-10 μA/cm²). These parameter changes create sufficient electrostatic repulsive forces to overcome the cohesive and adhesive forces holding fine dust particles to surfaces, achieving 75-85% cleanliness levels.
2Productivity
If electron beam energy is increased to improve dust ejection, then more dust is removed, but energy consumption increases
Solution Approach 1:
The patent applies partial action by using moderate electron beam energy levels (80-400 eV) and current densities (0.1-10 μA/cm²) that are sufficient to achieve 75-85% dust removal effectiveness without excessive energy consumption. This optimized range provides the minimum necessary energy to overcome dust adhesion forces while avoiding unnecessary energy waste.
Solution Approach 2:
The patent optimizes the energy parameters of the electron beam by specifying particular ranges for beam energy (80-400 eV) and current density (0.1-10 μA/cm²). These parameter changes balance dust removal effectiveness with energy efficiency, creating an optimal operating window that achieves high cleanliness levels without excessive power consumption.
3Speed
If electron beam current density is increased to remove dust faster, then cleaning speed improves, but surface damage risk increases
Solution Approach 1:
The patent uses partial action by applying electron beam current densities in the moderate range of 0.1-10 μA/cm², which provides sufficient cleaning speed while avoiding excessive current that could cause surface damage. This optimized range achieves effective dust removal without creating harmful thermal or radiative effects on the substrate.
Solution Approach 2:
The patent uses secondary electrons generated by the electron beam as an intermediary mechanism to remove dust particles. Instead of directly using high-energy primary electrons that could damage surfaces, the system relies on the secondary electrons (lower energy) to create the electrostatic repulsive forces needed for dust ejection, thereby protecting the surface from direct high-energy electron impact.
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 method achieves efficient dust removal, with up to 90% or more of the dust being ejected from surfaces, including those in extraterrestrial environments, using electron beams with controlled energy and current density.
Implementation Method 1
irradiating a first location of the layer of dust with an electron beam; thereby inducing the irradiated particle to emit a plurality of secondary electrons
Implementation Method 2
the secondary charge on the two or more other particles creates an electrostatic repulsive force between said particles; wherein the electrostatic repulsive force is greater than or equal to the balance of forces, such that said particles are ejected from the surface
Implementation Method 3
the first location includes the first cavity, such that the electron beam traverses at least a portion of the first cavity to irradiate a particle within the first portion of the particles
Data Source
AI summary
Disclosed herein are methods and devices for cleaning a surface of a substrate having a layer of dust disposed thereon by ejecting at least a portion of the dust from the surface. The methods comprise irradiating the layer of dust with an electron beam, such that the electron beam irradiates a particle thereby inducing said particle to emit a plurality of secondary electrons; wherein at least a portion of the plurality of secondary electrons impinge two or more neighboring particles to thereby generate a secondary charge on the two or more neighboring particles, wherein the secondary charge on the two or more neighboring particles creates an electrostatic repulsive force between said particles, wherein the electrostatic repulsive force is sufficient to eject said particles from the surface.