Protective Glass Contamination Detection With Dynamic Laser Thresholds
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Solution Overview
Problem
Existing protective glass contamination detection systems fail to accurately assess contamination levels due to variations in laser processing conditions, leading to improper detection of contamination on protective glass surfaces in laser processing machines.
Innovation Solution
A protective glass contamination detection device that adjusts contamination thresholds based on real-time processing conditions, including laser beam parameters and sensor characteristics, to accurately determine the degree of contamination on the protective glass.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a fixed contamination threshold is used for detection, then the detection system is simple to operate, but the detection accuracy deteriorates when laser processing conditions change
Solution Approach 1:
The contamination threshold is changed from a fixed value to a dynamic value that automatically adjusts according to laser processing conditions. The threshold calculation unit computes the threshold based on real-time laser output, duty ratio, and pulse frequency parameters, enabling the detection system to adapt to varying processing conditions while maintaining accurate contamination detection
Solution Approach 2:
The detection threshold parameter is modified as a function of laser processing parameters (output, duty ratio, pulse frequency). By establishing a mathematical relationship between the threshold and these parameters, the system dynamically adjusts the threshold to compensate for changes in scattered light intensity caused by varying laser conditions, thereby maintaining detection accuracy
2Productivity
If the laser output is doubled according to processing conditions, then the processing efficiency is improved, but the scattered light intensity doubles causing improper contamination detection
Solution Approach 1:
The system incorporates feedback from laser processing parameters (output, duty ratio, pulse frequency) to dynamically adjust the contamination threshold. When laser output is increased to improve productivity, the threshold calculation unit receives this information and automatically adjusts the threshold accordingly, compensating for the doubled scattered light intensity and maintaining accurate contamination detection
Solution Approach 2:
The contamination detection threshold is changed as a function of laser processing parameters. The threshold calculation unit computes the threshold based on the relationship between laser output, duty ratio, pulse frequency, and scattered light intensity, enabling the system to maintain detection accuracy even when laser output is doubled for improved processing efficiency
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
Enables precise detection of contamination levels on protective glass, ensuring timely replacement and maintaining processing quality by accounting for variations in laser processing conditions.
Implementation Method 1
detect scattered light caused by the contamination adhered to the protective glass
Data Source
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Figure 4
AI summary
A protective glass contamination detection device that detects contamination on a protective glass 25 for protecting a focusing lens 19 for focusing a laser beam to irradiate the focused laser beam onto a workpiece W includes a scattered light detection unit 27, an information acquisition unit 35, a contamination threshold setting unit 37, and a contamination determination unit 39. The scattered light detection unit 27 detects scattered light SL generated by contamination 51 adhered to the protective glass 25. An information acquisition unit 35 acquires information on processing conditions of a laser processing machine. The contamination threshold setting unit 37 sets a contamination threshold for detecting contamination on the protective glass 25 from a detection value X detected by the scattered light detection unit based on processing conditions of the laser processing machine. The contamination determination unit 39 determines a degree of contamination on the protective glass 25 based on the detection value X and the contamination threshold.