Laser Processing in Liquid With Gas Bubble Interference Detection
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Solution Overview
Problem
Gas bubbles formed during laser processing in liquids interfere with the laser radiation, causing undesired thermal effects and reducing processing efficiency due to differences in refractive index between air and liquid, leading to reflection and diffraction of the laser beam.
Innovation Solution
A method and system that detect gas bubbles using a detection unit, which can include cameras, LEDs, photodiodes, and ultrasonic generators, to automatically identify and mitigate their interference by adjusting the laser beam position, flow rates, or deactivating the laser radiation, ensuring minimal interaction with detected gas bubbles.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If laser radiation is used for processing workpieces, then high precision and high process rates are achieved, but local strong heating and undesired thermal effects outside the processing zone occur
Solution Approach 1:
A liquid is introduced as an intermediary medium between the laser radiation and the workpiece. The liquid absorbs excess thermal energy and conducts heat away from the processing zone, preventing thermal effects from spreading to areas outside the intended processing zone while allowing the laser to maintain high precision on the workpiece surface.
2Object-affected harmful factors
If the workpiece is processed in liquid to cool it throughout the entire process, then thermal effects are reduced, but gas bubbles form in the process chamber causing interference with laser radiation
Solution Approach 1:
The system performs preliminary detection of gas bubbles using a detection unit (such as a camera or optical sensor) before the laser radiation reaches the affected area. When bubbles are detected in the detection region, the system takes preliminary action by deflecting or deactivating the laser beam, preventing the bubbles from causing interference effects such as unwanted reflections or diffraction of the laser radiation.
Solution Approach 2:
A feedback mechanism is implemented where the detection unit continuously monitors the process chamber for gas bubbles. When bubbles are detected, the control unit receives this information and adjusts the laser processing parameters in real-time, such as deflecting the beam away from bubble regions or temporarily deactivating the laser, thereby eliminating interference effects and maintaining processing quality.
3Reliability
If gas bubbles are present in the detection region, then interference effects occur between laser radiation and gas bubbles due to refractive index differences, but continuous monitoring and adjustment reduce these effects
Solution Approach 1:
The detection unit serves multiple functions: it detects gas bubbles, monitors the processing zone, and provides feedback for real-time control adjustments. By using a single multi-functional detection and control system rather than separate specialized components, the patent reduces overall system complexity while maintaining the ability to eliminate interference effects and ensure processing quality.
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
Significantly reduces interference effects, enhancing the quality and speed of the laser processing by eliminating or minimizing the impact of gas bubbles on the workpiece, thereby improving cut edges and overall processing efficiency.
Implementation Method 1
The reason for this is the difference in the refractive index of air and liquid, which causes undesired reflection and diffraction of the laser radiation used at the interface between the liquid and the gas bubble.
Implementation Method 2
The reason for this is the difference in the refractive index of air and liquid, which causes undesired reflection and diffraction of the laser radiation used at the interface between the liquid and the gas bubble.
Implementation Method 3
The reason for this is the difference in the refractive index of air and liquid, which causes undesired reflection and diffraction of the laser radiation used at the interface between the liquid and the gas bubble.
Data Source
AI summary
A method for laser processing of workpieces in liquid, the method including the following steps:providing a workpiece in a process chamber filled with a liquid;focusing pulsed laser radiation on a surface of the workpiece using a focusing unit;producing a relative movement between the focused laser radiation and the workpiece surface using a positioning unit;detecting a gas bubble in a predefined detection region using a detection unit; andconducting a first action to avoid or reduce interaction effects between the laser radiation and the detected gas bubble.