Development of a polarimeter equipment for sunglasses according to the Brazilian standard NBR15111

Luís E. Lopes; Liliane Ventura

doi:10.1117/12.2001576

26 March 2013 Development of a polarimeter equipment for sunglasses according to the Brazilian standard NBR15111

Luís E. Lopes, Liliane Ventura

Proceedings Volume 8567, Ophthalmic Technologies XXIII; 85671L (2013) https://doi.org/10.1117/12.2001576
Event: SPIE BiOS, 2013, San Francisco, California, United States

Abstract

The use of polarizing filters in sunglasses has become increasingly common worldwide. Although the Brazilian standard NBR15111 has specific requirements for its use (position and efficiency), there is not a proper machine to make the specified measures. This paper describes the development of an equipment according to NBR15111. A study was made using a 120,000 lx white LED light source, and an analyzer, which is an assembly of two polarizing filters with its polarization axis orthogonally aligned, both in front a light sensor with 16 bit resolution. The proposed system was able to measure the polarization efficiency of all the sunglasses categories, including the critical situation of the category 4, 3% of light transmittance, and efficiency of 8:1. The direction of the polarization plane is determined with the resolution of 0.056°in this critical situation. The results meet the standard requirements of 0.5° for angle measures and 8:1 for filters efficiency, which shown that the proposed equipment is able to check the quality of the polarizing filters used in sunglasses, that are commercialized in the Brazilian market.

Citation Download Citation

Luís E. Lopes and Liliane Ventura "Development of a polarimeter equipment for sunglasses according to the Brazilian standard NBR15111", Proc. SPIE 8567, Ophthalmic Technologies XXIII, 85671L (26 March 2013); https://doi.org/10.1117/12.2001576

ACCESS THE FULL ARTICLE

INSTITUTIONAL
Select your institution to access the SPIE Digital Library.

SELECT YOUR INSTITUTION

PERSONAL
Sign in with your SPIE account to access your personal subscriptions or to use specific features such as save to my library, sign up for alerts, save searches, etc.

PERSONAL SIGN IN

No SPIE Account? Create one

PURCHASE THIS CONTENT

SUBSCRIBE TO DIGITAL LIBRARY

50 downloads per 1-year subscription

Members: $195

Non-members: $335 ADD TO CART

25 downloads per 1 - year subscription

Members: $145

Non-members: $250 ADD TO CART

PURCHASE SINGLE ARTICLE

Includes PDF, HTML & Video, when available