The coating witness is a sample used to test and evaluate the performance of optical coatings. By conducting various tests on the witness sample, the quality, durability, and functionality of the coating can be verified.
Reducing Reflection: Coatings can reduce light reflection and increase light transmission, resulting in clearer vision.
Increasing Durability: Coatings can increase the hardness of lenses, preventing scratches and wear.
Filtering Function: Coatings can filter specific wavelengths of light, such as ultraviolet or infrared light.
Special Effects: Coatings like anti-reflective films and reflective films can meet various optical needs.
Specific testing methods include:
1. Abrasion Test: Simulates wear and tear during daily use to evaluate the coating’s abrasion resistance.
2. Water Contact Angle Measurement: Measures the contact angle of water droplets on the coating surface to assess the coating’s hydrophobicity and durability.
3. Thermal Stability Test: Evaluates the coating’s stability in high-temperature environments.
4. Chemical Stability Test: Assesses the coating’s resistance to chemical substances.
Through these tests, the performance of optical coatings can be comprehensively evaluated to ensure their reliability and durability in practical applications.
| Diameter | Ø25.4mm |
| Diameter tolerance | ±0.1mm |
| Thickness | 1mm-3mm |
| Cleare aperture | >Ø22mm |
| Surface quality | 60/40 scratch/dig |
| Parallelism | <3 arc min |
| Flatness | Lambda/4 @633nm |
| Edge | Fine ground |
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