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Laser Profilometry on Micro-PTC

Author

Listed:
  • Gianluca Marotta

    (National Research Council—National Institute of Optics (CNR-INO), 50125 Florence, Italy)

  • Daniela Fontani

    (National Research Council—National Institute of Optics (CNR-INO), 50125 Florence, Italy)

  • Franco Francini

    (National Research Council—National Institute of Optics (CNR-INO), 50125 Florence, Italy)

  • David Jafrancesco

    (National Research Council—National Institute of Optics (CNR-INO), 50125 Florence, Italy)

  • Maurizio De Lucia

    (Department of Industrial Engineering, University of Florence, 50139 Florence, Italy)

  • Paola Sansoni

    (National Research Council—National Institute of Optics (CNR-INO), 50125 Florence, Italy)

Abstract

Profilometry is useful in detecting surface faults on solar concentrators, which can be imperfectly manufactured, thus affecting system performance. Profilometric analyses are performed on a micro-parabolic trough collector (m-PTC), with reduced sizes and greater mirror curvature than a usual PTC. The peculiar dimensions and shape of this micro-PTC request to develop a specific configuration of laser profilometry. It includes a laser diode with a converging lens placed in front of it, ensuring that the mirror curvature does not affect the beam reflection. A new method to calculate the spot position furnishes the reflected beam center even if it lies outside the target, giving it a virtual expansion. The profile is assessed with an iterative calculation, starting from a first point, physically measured. The results are the 3D profile reconstruction of the parabolic mirror and a map of the slope error for each mirror point. It also estimates the intercept factor , a parameter fundamental to optimize the m-PTC system, whose value is in agreement with a structured light measurement on the same object. This intercept factor was obtained averaging the local intercept factor calculated for each mirror point, which individuates the mirror portions not focusing the sunrays on the tube.

Suggested Citation

  • Gianluca Marotta & Daniela Fontani & Franco Francini & David Jafrancesco & Maurizio De Lucia & Paola Sansoni, 2022. "Laser Profilometry on Micro-PTC," Energies, MDPI, vol. 15(14), pages 1-18, July.
    • Handle: RePEc:gam:jeners:v:15:y:2022:i:14:p:5293-:d:868171
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    References listed on IDEAS

    as
    1. Sansoni, P. & Fontani, D. & Francini, F. & Giannuzzi, A. & Sani, E. & Mercatelli, L. & Jafrancesco, D., 2011. "Optical collection efficiency and orientation of a solar trough medium-power plant installed in Italy," Renewable Energy, Elsevier, vol. 36(9), pages 2341-2347.
    2. Aqachmar, Zineb & Allouhi, Amine & Jamil, Abdelmajid & Gagouch, Belgacem & Kousksou, Tarik, 2019. "Parabolic trough solar thermal power plant Noor I in Morocco," Energy, Elsevier, vol. 178(C), pages 572-584.
    3. Gianluca Marotta & Paola Sansoni & Franco Francini & David Jafrancesco & Maurizio De Lucia & Daniela Fontani, 2020. "Structured Light Profilometry on m-PTC," Energies, MDPI, vol. 13(21), pages 1-17, October.
    4. Li, Qiyuan & Zheng, Cheng & Shirazi, Ali & Bany Mousa, Osama & Moscia, Fabio & Scott, Jason A. & Taylor, Robert A., 2017. "Design and analysis of a medium-temperature, concentrated solar thermal collector for air-conditioning applications," Applied Energy, Elsevier, vol. 190(C), pages 1159-1173.
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