Verification Scheme for Salt Fog Resistance of Scale Lines Marked by Picosecond 532 nm Laser on Glass
Abstract:
This article discusses a verification scheme to ensure that scale lines marked on glass with a picosecond 532 nm laser maintain a contrast ratio of at least 90% after a 48-hour salt fog test. The scheme is crucial for industries where glass components are exposed to harsh environments, requiring durable and legible markings.
Introduction:
In various industrial applications, glass components are subjected to harsh environmental conditions, including exposure to salt fog. To ensure the longevity and readability of markings on these components, it is essential to validate the durability of laser-marked scale lines. This article presents a detailed verification scheme based on the salt fog test, specifically designed for glass marked with a picosecond 532 nm laser.
Materials and Methods:
The verification scheme involves the following steps:
1. Sample Preparation:
- Glass samples with scale lines marked using a picosecond 532 nm laser are prepared.
- The marking parameters, such as pulse energy, repetition rate, and scan speed, are standardized to ensure consistency across samples.
2. Salt Fog Test Setup:
- The samples are placed in a salt fog chamber designed according to ASTM B117 standards.
- A 5% sodium chloride solution is used to create a salt fog environment at a temperature of 35°C and a relative humidity of 95%.
3. Test Duration:
- The samples are exposed to the salt fog for a duration of 48 hours.
4. Contrast Ratio Measurement:
- Post-test, the contrast ratio of the scale lines is measured using a standardized method.
- The contrast ratio is calculated as the ratio of the difference in reflectance between the marked and unmarked areas to the reflectance of the unmarked area.
5. Data Analysis:
- The contrast ratio data is analyzed to determine the percentage of samples that maintain a contrast ratio of at least 90%.
- Statistical methods are employed to assess the reliability of the results.
Results:
The results section will present the contrast ratio data for the glass samples after the 48-hour salt fog test. It will highlight the percentage of samples that meet the required contrast ratio threshold and provide insights into the performance of the picosecond 532 nm laser marking process under harsh environmental conditions.
Discussion:
The discussion will analyze the results in the context of the laser marking parameters and their impact on the durability of the scale lines. It will also explore potential improvements to the marking process to enhance the resistance of the markings to salt fog exposure.
Conclusion:
The article concludes with recommendations for the verification scheme and the optimal laser marking parameters to achieve a contrast ratio of at least 90% after a 48-hour salt fog test. This ensures that the scale lines marked with a picosecond 532 nm laser on glass remain legible and durable in harsh environments.
References:
- ASTM B117: Standard Practice for Operating Salt Spray (Fog) Testing Apparatus
- ISO/IEC 14644: Cleanrooms and associated controlled environments - Part 1: Classification of air cleanliness by particle concentration
- Laser marking machine manufacturers' technical specifications for picosecond 532 nm lasers
[End of Article]
Note: The above article is a concise outline for a verification scheme to ensure the durability of scale lines marked on glass with a picosecond 532 nm laser. The actual article would include detailed experimental data, analysis, and references to support the conclusions drawn. The word count is well within the 2500-word limit as requested.]
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