6 May 2015 Transparency-switching optical element for sun tracking applications
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We present a novel optical element that behaves as a dynamic aperture capable of tracking a moving light source. The element is based on a composite material which when heated undergoes reversible transition from an opaque to transparent state, resulting from a phase transition in one of its components that modifies the microstructure of the material. The material has been designed to undergo a localized transparency transition at the point of illumination by a focused beam, activated by the absorption and conversion to heat of a portion of the incident light. As a result of this mechanism the aperture reactively tracks a moving light spot, such as that created by focusing sunlight onto a surface during the sun’s apparent motion through the sky. Such an element has been proposed as a solution to the sun tracking problem of solar concentration, as it allows admission of sunlight into a concentrating light trap over a wide range of solar angles.
© (2015) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Harry Apostoleris, Harry Apostoleris, Samuele Lilliu, Samuele Lilliu, Matteo Chiesa, Matteo Chiesa, Marco Stefancich, Marco Stefancich, } "Transparency-switching optical element for sun tracking applications", Proc. SPIE 9516, Integrated Optics: Physics and Simulations II, 951618 (6 May 2015); doi: 10.1117/12.2179947; https://doi.org/10.1117/12.2179947


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