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UV–Vis Spectrometers01:14

UV–Vis Spectrometers

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The absorbance of UV and visible (UV–visible) radiations is measured using a UV–visible spectrophotometer. Deuterium lamps, which emit UV radiation, and tungsten lamps, which produce radiation in the visible region, are used as light sources in UV–visible spectrophotometers. A monochromator or prism is used for diffraction grating, i.e., to split the incoming radiation into different wavelengths. A system of slits is used to focus the desired wavelength on the sample cell.
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Related Experiment Video

Updated: Apr 30, 2026

Subjective Refraction Test Using a Smartphone for Vision Screening
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Subjective Refraction Test Using a Smartphone for Vision Screening

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Self-service kiosk for testing sunglasses.

Marcio M Mello, Victor A C Lincoln, Liliane Ventura1

  • 1Department of Electrical Engineering, Escola de Engenharia de Sao Carlos - University of Sao Paulo/Av, Trabalhador Saocarlense 400, 13566-590, Sao Carlos, SP, Brasil. lilianeventura@usp.br.

Biomedical Engineering Online
|April 26, 2014
PubMed
Summary
This summary is machine-generated.

A new prototype kiosk allows the public to easily test their sunglasses' ultraviolet (UV) protection and lens category for free. This device ensures users can verify UV protection levels, promoting eye safety and informed purchasing decisions.

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Area of Science:

  • Optometry and Vision Science
  • Materials Science
  • Consumer Product Safety

Background:

  • Consumers lack accessible methods to verify long-term ultraviolet (UV) protection in sunglasses.
  • Current UV protection assessment requires professional equipment like spectrophotometers.
  • Sunglasses are categorized (0-4) based on visible light transmission, impacting UV protection efficacy.

Purpose of the Study:

  • To develop an accessible, user-friendly prototype for testing sunglasses' UV protection and lens category.
  • To provide a self-service method for consumers to assess sunglass quality according to Brazilian Standards (NBR15111).

Main Methods:

  • A prototype kiosk was engineered with UVA/UVB light sources and photodiode sensors for UV measurement.
  • Visible light sensors and LEDs were incorporated to determine lens categories.
  • Custom electronics and software were developed for automated measurements and user reporting.

Main Results:

  • The kiosk provides transmittance measurements within the NBR15111 deviation limit (0.25%).
  • Measurements showed high correlation (r² > 0.9997) when compared to a CARY 5000 spectrophotometer.
  • The system accurately categorizes UV protection levels for non-corrective sunglasses.

Conclusions:

  • The prototype successfully identifies UV protection categories for sunglasses, making this information publicly accessible.
  • It empowers consumers to understand their sunglasses' protective quality through an easy, free testing method.
  • The device aids in public education regarding the importance of adequate UV protection in eyewear.