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As LED systems have been evolving today in a
great number of niche applications including
automotive lighting, water purification, and skin
imaging etc., extensive studies of scientists and
engineers in the field have been constantly
looking for ways to reduce generated heat loads
and maximize the light output to reach the highest
efficiency ratios. While the current systems
developed over the last years achieved to reach
even a 40% LED light efficiency, a higher portion
of the electrical input energy of LEDs is still
produced as heat and it hinders their development
potential. In addition, the compact size of the LED
systems poses some challenges to the reliable
characterization of their performance at low
uncertainties. Especially, the performance
considerations associated with thermal loads over
a limited size of LED chips require the effective
characterization of these systems for various
operational conditions. One of the techniques
used for this purpose is that an LED package is
characterized by a decrease in forward voltage
with increasing junction temperature. As LEDs are
operated at higher junction temperatures, the
amount and quality of the light deteriorates
significantly, and the less efficient use of the LEDs
results in additional operating costs and reduced
lifetime of LEDs. In fact, accurate identification of
thermal behavior of LED packages is one of the
essential tasks towards improving the design of
LED systems. If thermal characterization of LEDs
is accurately done, performance parameters of
LED packages are more reliably optimized to yield
the highest possible performance ratios. Thus,
this study focused on the design and
manufacturing of a thermally improved and fully
operational rapid temperature controllable
chamber in which calibration and test phases of
junction temperature measurements are
sensitively conducted under a low uncertainty.
In this paper novel approaches to optical beam shaping for lighting systems are presented. Application of various computer generated micro/nano-structured optical components is discussed.
TCC1..2: Modelo de Carta Convite para Composição de Banca do Curso de Licenciatura em Informática da UTFPR-FB
Template por
Francisco Reinaldo (http://lattes.cnpq.br/7401534350061823)
Inspirado na carta de Andreza Quintas :)
06 jun 18 versao 1a
31oct18 versao 2link
Agradecimentos a Overleaf pela oportunidade
Francisco Reinaldo
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