Statistical Laser Pulse Positioning to Prevent Surface Interference

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Solution Overview

Problem

Existing methods for processing materials with pulsed lasers often result in regular structures that can lead to interference effects, disturbing the visual appearance of the processed material.

Innovation Solution

The method involves introducing laser pulses into the material in a spatially statistically distributed manner around a spatial target value, allowing for adjustments based on the current feed rate to avoid regular patterns and interference effects.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Productivity

If laser pulses are introduced regularly with fixed repetition rate, then processing efficiency is improved, but regular structures are created that cause interference effects

Engineering Contradiction:

Improveprocessing efficiencyVSAvoidinterference effects

Core Design Contradiction:

ProductivityVSObject-affected harmful factors

Solution Approach 1:

The patent applies preliminary action by pre-calculating and storing multiple possible pulse positions in a lookup table before processing begins. The random pulse positions are determined in advance based on the feed rate and target position, eliminating the need for real-time random generation during material processing. This ensures that while pulse positions vary randomly to prevent interference patterns, the processing maintains high efficiency through pre-computed positioning data.

Inventive Principle:

Principle #10Preliminary action

2Object-affected harmful factors

If laser pulses are distributed spatially statistically around target value, then interference effects are reduced, but control precision may be compromised

Engineering Contradiction:

Improveinterference effectsVSAvoidspatial control precision

Core Design Contradiction:

Object-affected harmful factorsVSMeasurement precision

Solution Approach 1:

The patent employs parameter changes by dynamically adjusting the standard deviation of the normal distribution based on the feed rate. When the feed rate changes, the spatial distribution parameters are automatically modified to maintain optimal balance between preventing interference patterns and ensuring precise material processing. This adaptive parameter adjustment allows the system to maintain control precision across varying processing conditions while still utilizing random pulse positioning to eliminate interference effects.

Inventive Principle:

Principle #35Parameter changes

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 reduces disruptive optical effects such as interference, resulting in a more uniform and visually appealing processed surface, while also allowing for precise control over material modifications.

Implementation Method 1

processing a material by means of laser pulses of a pulsed laser

Methodology Applied

Scientific EffectLaser ablation: Laser Ablation

Implementation Method 2

laser pulses of a pulsed laser... process the material

Methodology Applied

Scientific EffectLaser heating: Heating

Data Source

PatentUS20250196257A1Device and method for processing a material by means of laser pulses that are introduced spatially statistically around a spatial target value

Publication Date: 2025.06.19 TRUMPF LASER GMBH CO KG

AI summary

A method for processing a material by using laser pulses of a pulsed laser includes introducing the laser pulses into the material in order to process the material. The laser pulses are introduced into the material in a distributed manner spatially statistically around a spatial target value. A spatial statistical distribution of the laser pulses is capable of being adjusted and adapted according to a current feed rate.