Laser Ablation Cleaning With Tuned Wavelengths to Protect Substrates
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing methods for cleaning surfaces, such as buildings and artworks, often damage the surface material while removing contaminants like corrosion, oxidation, and foreign materials, as they lack precision in targeting specific layers without harming the underlying substrate.
Innovation Solution
A laser ablation system that tunes the wavelength and power of a laser beam to selectively ablate surface coatings or contaminants, using circular or oval scan patterns to avoid hotspots and ensure even energy distribution, allowing for precise removal of unwanted materials while preserving the underlying surface.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional cleaning methods are used to remove contaminants from surfaces, then cleaning effectiveness is improved, but surface damage occurs
Solution Approach 1:
The patent applies parameter changes by precisely controlling laser wavelength, pulse duration, and fluence to achieve selective ablation. By tuning these parameters, the laser removes contaminants effectively while preventing damage to the underlying surface, resolving the contradiction between cleaning effectiveness and surface integrity
Solution Approach 2:
The patent implements local quality through selective laser ablation where different regions (contaminants vs. substrate) receive different effective energy treatments. The laser parameters are optimized to affect only the contaminant layer locally, leaving the base material unaffected, thus achieving high cleaning effectiveness without surface damage
2Manufacturing precision
If laser beam is focused to a small contact area to increase ablation precision, then manufacturing precision is improved, but hot spots are formed that may damage the surface
Solution Approach 1:
The patent applies segmentation by dividing the laser beam into multiple sub-beams or scanning the beam across multiple positions to create a distributed contact pattern. This segmentation prevents concentration of energy at a single point, eliminating hot spots while maintaining precise control over the ablation zone
Solution Approach 2:
The patent uses periodic action through pulsed laser delivery with controlled duty cycles and scan patterns. By delivering energy in periodic pulses rather than continuous exposure, the system allows heat dissipation between pulses, preventing hot spot formation while maintaining high ablation precision through accurate pulse timing and positioning
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 system effectively removes contaminants like corrosion, oxidation, and foreign materials from surfaces without damaging them, providing a precise and efficient method for cleaning and processing that can be used on various materials, including historic artifacts, by utilizing circular or oval scan patterns to ensure consistent and even ablation.
Implementation Method 1
laser ablation cleaning and material processing using a laser
Implementation Method 2
the laser beam ablates a coating on the surface at the contact area
Data Source
Figure 1
Figure 2A
Figure 2B
AI summary
Systems and methods for ablating or processing a surface using a laser beam are provided. A method includes directing a laser beam at a surface to form a contact area. The method also includes moving the contact area to form a contact curve. The method includes tuning a wavelength and a power of the laser beam to process a material and/or ablate a coating. The wavelength and the power may be further tuned to not damage the surface beneath the coating. Moving the contact area may include forming a second contact curve by superimposing, at a same time, the second contact curve on the contact curve. A system includes a laser and a directing arrangement configured to direct a laser beam from the laser at a surface to form a contact area. A non-transitory processor-readable medium having instructions stored thereon is provided.