System to study the effect of natural sunlight and solar simulator on sunglasses: a contribution to the Brazilian Standard NBR15111

• Grant number: 14/16938-0
• Support type: Regular Research Grants
• Duration: May 01, 2015 - July 31, 2017
• Field of knowledge: Engineering - Biomedical Engineering - Medical Engineering
• Principal researcher: Liliane Ventura Schiabel
• Grantee: Liliane Ventura Schiabel
• Home Institution: Escola de Engenharia de São Carlos (EESC). Universidade de São Paulo (USP). São Carlos , SP, Brazil

Abstract

This project aims to conduct studies on sunglasses to help with the nationalization of Brazilian standard NBR15111, suggesting more appropriate national parameters conditions. The first Brazilian standard for UV protection sunglasses, NBR15111, was drafted and published in 2003. From 2010 to 2013, the School of Engineering of São Carlos (USP) made contribution in the review and drafting of this standard of the CB49 committee and the main committe,e attended by Prof. Dr. Liliane Ventura, in order to change this rule. This Brazilian standard was hitherto a faithful copy (mirror) of European, BSEN1836 standard, and the main change so far was about the extending interval analysis of UV protection sunglasses, from 280 - 380nm to 280-400nm; and the resistance to irradiation test increased from 25h to 50h. This was based on results of a study carried out in the process 2011/06079-2 from FAPESP and also the interaction with professionals who participate in committees of American standards, such as Herbert Hoover personally and David Sliney (distance), members of the U.S. standards committee for sunglassesIn previous conducted studies (FAPESP - 2011/06079-2)- where a self-service kiosk became available to the public, out of the 879 measurements, 20% of the glasses are not in accordance with ultraviolet protection established by the standards. This number is quite high, as the president of Sindióptica - Mr. Luis Alberto Perez has stated. This study resulted in a HIGHLY accessed article (http://www.biomedical-engineering-online.com/content/13/April/2014) and had international repercussions, where the news network BBC News did a story, which was 3 times in the air in June 2014, and the link to the article is: http://www.bbc.com/news/health-28040792 or www.sel.eesc.usp.br/lio/BBCNEWS. BBC has also conducted a second story, which can be found at the link http://www.bbc.com/news/health-28452943. In previous studies, there are indications that ultraviolet protection degrades with use and exposure of sun glasses to natural ultraviolet radiation. Thus, this project aims to build a prototype for irradiation lens sunglasses, where one of the spectacles will be submitted to the solar simulator; the other in the prototype. This prototype consists of a panel with cover, which should house 100 lenses arranged in the use position, vertical, which will be irradiated by the sun from sunrise until sunset. The lid opens automatically and should turn towards the sun, so that the lens will always be irradiated from the front and orthogonally by the sun. Sensors of humidity and dust (for rainy and / or days with soot) will be installed to close the cover and protect the glasses of undesirable weather conditions, as well as a camera for viewing the panel all the time. A sensor to determine the ultraviolet index which lenses are being irradiated will be coupled to the system and the data will be recorded as well as sent to a panel that will be on display to the public. The exposure time as well as the UV index (at every 10 s) will be automatically recorded and automatic opening or closing the lid may also be interfered by a PC by a controlling website. Previously to the lenses being placed on the panel, spectroscopy will be performed, in the range of 280nm - 2000nm, at 5 different positions imposed by the standard at 3 different temperatures: 230C; 50C; 350C; also polarization measurements of the lenses will be performed; as well as the flammability and resistance to impact tests. Just sunglasses in compliance with the standards will be subject of the study. All these tests will be performed over again after every 30 days of exposure. The prototype for the flammability test should be developed. The theoretical calculations for the ultraviolet irradiation with provided irradiance data and insertion of the conditions of each of the most populous Brazilian localities studies will also be conducted in this work. (AU)

Scientific publications

(5)

(References retrieved automatically from Web of Science and SciELO through information on FAPESP grants and their corresponding numbers as mentioned in the publications by the authors)

LOUREIRO, ARTUR D.; VENTURA, LILIANE. Are sunglasses appropriate for driving? Investigation and prototype for public testing. BIOMEDICAL ENGINEERING ONLINE, v. 20, n. 1 APR 29 2021. Web of Science Citations: 0.

MASILI, MAURO; VENTURA, LILIANE. Local Tilt Optimization of Photovoltaic Solar Panels for Maximum Radiation Absorption. INTERNATIONAL JOURNAL OF PHOTOENERGY, v. 2019, NOV 14 2019. Web of Science Citations: 0.

MASILI, MAURO; DUARTE, FERNANDA OLIVEIRA; WHITE, CHRISTOPHER C.; VENTURA, LILIANE. Degradation of sunglasses filters after long-term irradiation within solar simulator. ENGINEERING FAILURE ANALYSIS, v. 103, p. 505-516, SEP 2019. Web of Science Citations: 0.

MAGRI, RENAN; MASILI, MAURO; DUARTE, FERNANDA OLIVEIRA; VENTURA, LILIANE. Building a resistance to ignition testing device for sunglasses and analysing data: a continuing study for sunglasses standards. BIOMEDICAL ENGINEERING ONLINE, v. 16, SEP 21 2017. Web of Science Citations: 2.

MASILI, MAURO; VENTURA, LILIANE. Equivalence between solar irradiance and solar simulators in aging tests of sunglasses. BIOMEDICAL ENGINEERING ONLINE, v. 15, AUG 26 2016. Web of Science Citations: 7.