Non-destructive reflectance measurement technique for anti-reflective coating during ophthalmic lens manufacturing

Lawan Sampanporn; Boonsong Sutapun

doi:10.1117/12.3022946

28 May 2024 Non-destructive reflectance measurement technique for anti-reflective coating during ophthalmic lens manufacturing

Lawan Sampanporn, Boonsong Sutapun

Author Affiliations +

Proceedings Volume 13083, SPIE Future Sensing Technologies 2024; 130830I (2024) https://doi.org/10.1117/12.3022946
Event: SPIE Future Sensing Technologies, 2024, Yokohama, Japan

Abstract

Anti-reflective coating on ophthalmic lenses is an essential process for glare reduction. After coating, lenses must be individually inspected to obtain the highest quality control. The ISO 8980-4 method recommends that the spectral reflectance measurement of the sample’s top surface require the sample’s back surface to be frosted or painted matte black, a destructive process. Lens manufacturers often employ a manual inspection technique, observing color appearance and brightness reflected from a lens sample compared to a reference sample by the naked eye of well-trained technicians. With many lenses to be inspected daily, human errors are unavoidable. In this work, we have developed a new non-destructive optical technique that can be used to measure the spectral reflectance of the lenses based on a modified spectral confocal microscopy. The critical procedure of this technique is that the confocal probe must be placed at the confocal peak of the reference standard and the confocal peak of the lens sample. Compared to a spectrophotometric method, a mean relative reflectance error of 0.042 %R in the 400-780 nm spectral range can be archived using the proposed confocal technique, provided that the confocal probe is placed within ± 5 μm from the peaks of the confocal signal. The proposed confocal technique could be utilized non-destructively and routinely for spectral reflectance measurement of the coating quality of ophthalmic lenses and other transparent optical elements.

Conference Presentation

(2024) Published by SPIE. Downloading of the abstract is permitted for personal use only.

Citation Download Citation

Lawan Sampanporn and Boonsong Sutapun "Non-destructive reflectance measurement technique for anti-reflective coating during ophthalmic lens manufacturing", Proc. SPIE 13083, SPIE Future Sensing Technologies 2024, 130830I (28 May 2024); https://doi.org/10.1117/12.3022946

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