Automated panel to study the effect of natural sunlight on sunglasses

• Grant number: 14/17252-5
• Support Opportunities: Scholarships in Brazil - Master
• Effective date (Start): December 01, 2014
• Effective date (End): February 29, 2016
• Field of knowledge: Engineering - Biomedical Engineering - Medical Engineering
• Acordo de Cooperação: Coordination of Improvement of Higher Education Personnel (CAPES)
• Principal Investigator: Liliane Ventura Schiabel
• Grantee: Leonardo Mariano Gomes
• Host 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 sunglasses. In 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. (AU)

Scientific publications

(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, A. D.; GOMES, L. M.; VENTURA, L.; COSTAFELIX, RPB. Transmittance Variations Analysis in Sunglasses Lenses Post Sun Exposure. WAKE CONFERENCE 2021, v. 733, p. 4-pg., 2016-01-01. (14/17252-5)

Academic Publications

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

GOMES, Leonardo Mariano. Automated panel to study the effect of natural sunlight on sunglasses. 2016. Master's Dissertation - Universidade de São Paulo (USP). Escola de Engenharia de São Carlos (EESC/SBD) São Carlos.