Protective Glass Contamination Detection Under Variable Laser Conditions
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Solution Overview
Problem
Existing protective glass contamination detection devices in laser processing machines fail to accurately detect contamination levels due to changes in processing conditions, leading to improper detection and potential deterioration in processing quality.
Innovation Solution
A protective glass contamination detection device that includes a scattered light detection unit, an information acquisition unit, a contamination threshold setting unit, and a contamination determination unit, which sets contamination thresholds based on processing conditions such as laser beam intensity, duty ratio, pulse frequency, and sensor characteristics to accurately determine contamination levels.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a fixed contamination threshold is used for detection, then the device complexity is reduced, but the measurement precision deteriorates when processing conditions change
Solution Approach 1:
The contamination threshold is changed from a fixed value to a dynamic value that automatically adjusts according to processing conditions (laser output, duty ratio, pulse frequency, beam diameter). The threshold calculation unit computes the appropriate threshold based on real-time processing condition data, ensuring accurate contamination detection across varying operational parameters without increasing overall system complexity.
Solution Approach 2:
The detection threshold parameter is modified based on changes in processing condition parameters. When laser output, duty ratio, pulse frequency, or beam diameter changes, the contamination threshold is recalculated to maintain detection accuracy. This parameter coupling ensures that the detection system remains precise across different processing conditions without requiring a completely new detection mechanism.
2Productivity
If the laser output is doubled according to processing conditions, then the productivity is improved, but the measurement precision of contamination detection deteriorates due to increased scattered light intensity
Solution Approach 1:
The system implements feedback by continuously monitoring processing conditions (including laser output levels) and using this information to adjust the contamination threshold accordingly. When laser output is increased to improve productivity, the feedback mechanism triggers a recalculation of the threshold to account for the increased scattered light intensity, thereby maintaining detection precision despite higher productivity operations.
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 solution enables proper detection of contamination on the protective glass, reducing defective products and ensuring consistent processing quality by adjusting contamination thresholds according to varying processing conditions.
Implementation Method 1
a photodetector is arranged, which senses scattered light scattered on an edge of the protective glass due to contamination particles adhered to the surface of the protective glass
Data Source
AI summary
A protective glass contamination detection device that detects contamination on a protective glass for protecting a focusing lens for focusing a laser beam to irradiate the focused laser beam onto a workpiece includes a scattered light detection unit, an information acquisition unit, a contamination threshold setting unit, and a contamination determination unit. The scattered light detection unit detects scattered light generated by contamination adhered to the protective glass. An information acquisition unit acquires information on processing conditions of a laser processing machine. The contamination threshold setting unit sets a contamination threshold for detecting contamination on the protective glass from a detection value detected by the scattered light detection unit based on processing conditions of the laser processing machine. The contamination determination unit determines a degree of contamination on the protective glass based on the detection value and the contamination threshold.