Galvanometer Waveform Shaping for Uniform Laser Cleaning
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Solution Overview
Problem
Existing laser cleaning methods using triangular and sine wave signals for galvanometer control result in uneven light spot distribution, leading to high coverage in the middle area and low coverage on the sides, causing overablation and uneven cleaning.
Innovation Solution
A peaked-top sine wave signal is applied to the motor to control the galvanometer's reciprocated swing, shaping the laser beam into a linear beam, which is then used for laser cleaning, combining multiple cleaning periods to ensure uniform energy distribution across the surface.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a triangular wave signal is applied to the motor to control galvanometer swing, then the light spot distribution is uniform within a cleaning line, but the cleaning coverage ratio in the middle area is high while the cleaning coverage ratio in both side areas is low
Solution Approach 1:
The patent changes the waveform parameter from a standard triangular wave to a modified triangular wave with different slope characteristics. By adjusting the waveform parameters (making the rising edge steeper and the falling edge gentler), the patent achieves both uniform light spot distribution and improved cleaning coverage across the entire processing area, including the side regions that were previously under-cleaned.
2Quantity of substance
If a sine wave signal is applied to the motor to control galvanometer swing, then the problem caused by the zigzag cleaning is corrected to some extent, but an overablation phenomenon occurs due to the dense distribution of spots on both sides
Solution Approach 1:
The patent modifies the waveform parameters to create a customized triangular wave that balances spot density distribution. By carefully adjusting the waveform characteristics, the patent prevents overablation on the sides while maintaining adequate cleaning coverage, achieving a compromise that neither standard triangular nor sine wave can provide alone.
3Productivity
If the robot drives the processing head to move to achieve cleaning in a certain area, then the cleaning speed and accuracy are improved, but the light spot distribution becomes uneven due to the zigzag route
Solution Approach 1:
The patent changes the control waveform parameters to compensate for the zigzag motion pattern induced by robot movement. By adjusting the waveform characteristics, the patent achieves uniform light spot distribution even when the processing head follows a zigzag trajectory, maintaining manufacturing precision while preserving the high cleaning speed enabled by robotic automation.
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 prevents overablation and achieves more uniform laser cleaning by ensuring dense spot distribution on both sides and sparse distribution in the middle, resulting in improved cleaning quality and uniformity across the entire area.
Implementation Method 1
controlling a galvanometer to swing in a reciprocated manner by the motor; shaping a laser beam emitted by a laser to a linear beam by the reciprocated swing of the galvanometer
Implementation Method 2
performing laser cleaning using the shaped linear beam
Data Source
AI summary
A laser cleaning method and device for improving uniformity of a laser cleaning surface are provided. The laser cleaning method includes: applying a peaked-top sine wave signal to a motor; controlling a galvanometer to swing in a reciprocated manner by the motor; shaping a laser beam emitted by a laser to a linear beam by the reciprocated swing of the galvanometer; and performing laser cleaning using the shaped linear beam.