Designing of Light Emitting Diode Lens with Spatial Uniformity Improvement for Cell Illuminating Apparatus
Use of a secondary lens for various applications involving Light Emitting Diode (LED) illumination has gained much popularity in the past few decades. Among these, biomedical-based illumination applications, which require energy efficient illumination, have become one of the most challenging engineering issues. However, there exists a trade-off between the extraction energy E and the uniformity of the illumination pattern. We therefore propose a methodology to improve the uniformity of the illumination pattern for biomedical illumination applications. A non-spherical lens is designed to optimize the illumination uniformity in an area; we demonstrate a major improvement in the illumination uniformity i.e., from 28.4% (E = 48.46 Lumens within radius R = 140 mm) to 95.3% (E = 43.68 Lumens within R = 150 mm circular region under). Improvements in uniformity with E remaining almost the same can be helpful in cell stimulating applications, such as optogenetic or optical neural guiding experiments.
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Document Type: Research Article
Publication date: September 1, 2013
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