Prototype for Polarized Sunglasses Analysis

• Grant number: 12/11171-8
• Support Opportunities: Scholarships in Brazil - Master
• Start date: August 01, 2012
• End date: July 31, 2014
• Field of knowledge: Engineering - Biomedical Engineering - Medical Engineering
• Principal Investigator: Liliane Ventura Schiabel
• Grantee: Luís Eduardo Lopes
• Host Institution: Escola de Engenharia de São Carlos (EESC). Universidade de São Paulo (USP). São Carlos , SP, Brazil

Abstract

Polarized sunglasses provides the user large visual comfort, being able to reduce the intense glare coming from the back-scattered reflection of light. Currently, these products are available on the market and are highly attractive to consumers.The Brazilian standard NBR15111(2004) (sun protection glasses, sun protection filters for general use and filters for direct observation of the sun), has specific requirements for polarizing sunglasses. However, in Brazil, it is not available on the national market such equipment for performing this particular measurement according to NBR15111(2004).Therefore, our task is to develop a prototype that provides measurements of the polarized filters of sunglasses as required by the Brazilian standard, NBR15111(2004). The prototype must check the direction of polarization of both lenses of the sunglasses and determine the angles with respect to the vertical axis and the angle between the pair of lenses of the same sunglasses, with an accuracy of 0.4°. Moreover, according to NBR15111(2004), the angle between the two polarization axis of the pair of lenses from the sunglasses should not exceed 6°.Also, the prototype must be able to quantify the polarization of the spectacles, by measuring the transmittance of the lens by incident lights parallel and perpendicular to the direction of polarization.We also hope to that this prototype be the first Brazilian equipment for determining the axis of polarization of sunglasses, according to the referred Brazilian standard. It is also expected that this work brings benefits to the Brazilians, which will be able to check on their consuming products.

Academic Publications

(References retrieved automatically from State of São Paulo Research Institutions)

LOPES, Luís Eduardo. Development of a prototype for measurements in sunglasses polarization filters according to NBR15111. 2014. Master's Dissertation - Universidade de São Paulo (USP). Escola de Engenharia de São Carlos (EESC/SBD) São Carlos.