Optical Diffraction Groove Generation for Flow-Reducing Riblets
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Solution Overview
Problem
Existing laser processing techniques do not effectively generate grooves with improved characteristics for reducing flow resistance on surfaces.
Innovation Solution
A laser processing device comprising an optical diffraction arrangement to generate multiple intensity maxima and an actuator arrangement for relative movement between the output radiation and the surface, creating a plurality of grooves.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If conventional laser processing techniques are used, then the process is simple, but the ability to generate grooves with improved flow resistance characteristics is insufficient
Solution Approach 1:
An optical diffraction arrangement is introduced as an intermediary component between the laser source and the surface to be processed. This diffraction arrangement transforms the laser radiation into multiple intensity maxima, enabling precise groove generation at multiple locations simultaneously without requiring complex mechanical positioning systems
Solution Approach 2:
The patent replaces mechanical scanning or positioning systems with an optical diffraction-based approach. Instead of moving the laser or the workpiece to create multiple grooves, the optical diffraction arrangement generates multiple intensity maxima in the radiation field, achieving multi-point processing through optical field distribution rather than mechanical movement
2Productivity
If multiple grooves are generated simultaneously, then productivity improves, but device complexity increases
Solution Approach 1:
The patent replaces complex mechanical multi-axis scanning systems with a relatively simple optical diffraction arrangement. The diffraction grating or phase mask creates multiple intensity maxima through optical interference, achieving simultaneous multi-point processing without requiring multiple lasers or complex mechanical positioning mechanisms
Solution Approach 2:
The optical diffraction arrangement serves multiple functions simultaneously: it divides the laser beam into multiple paths, focuses each path to create intensity maxima at specific locations, and maintains coherence across all beams. This single component performs what would otherwise require multiple separate optical systems and mechanical positioning mechanisms
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 device enables precise and efficient generation of grooves that form riblets, reducing flow resistance on surfaces by generating a plurality of intensity maxima directly through optical diffraction, allowing for improved surface characteristics.
Implementation Method 1
an optical diffraction arrangement adapted to receive a laser radiation and to generate an output radiation hereupon (thereon), the output radiation having a plurality of intensity maxima
Implementation Method 2
each intensity maximum (of the plurality of intensity maxima) generates a (one) groove of the plurality of grooves
Data Source
AI summary
A laser processing device for generating a plurality of grooves in a surface comprises an optical diffraction arrangement adapted to receive a laser radiation and to generate an output radiation hereupon, the output radiation having a plurality of intensity maxima. An actuator arrangement is provided for generating a relative movement between the output radiation and the surface, wherein each intensity maximum generates a groove of the plurality of grooves.