Non-intrusive,three-dimensional temperature and composition measurements inside fluid cells in microgravity using a confocal holography microscope |
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| Institution: | 1. Key Laboratory of Photoelectric Imaging Technology and System, Ministry of Education of China, School of Optoelectronics, Beijing Institute of Technology, Beijing 100081, China;2. Department of Opto-Electronics Engineering, Mechanical Engineering College, Shijiazhuang 050000, China;1. Department of Geology, University of Alcalá, 28871 Madrid, Spain;2. Institute of Geological Sciences, Freie Universitaet Berlin, Berlin 12249, Germany;3. Department of Geodynamics, Complutense University of Madrid, 28040 Madrid, Spain;1. Centre for Planetary Science and Exploration, University of Western Ontario, London, ON N6A 5B7, Canada;2. Dept. of Earth Sciences, University of Western Ontario, London, ON N6A 5B7, Canada;3. Dept. of Physics and Astronomy, University of Western Ontario, London, ON N6A 5B7, Canada;1. VTT Technical Research Centre of Finland, P.O. Box 1000, MK6, FI-02044 VTT (Espoo), Finland;2. Centre for Metrology and Accreditation – Mikes, P.O. Box 9, FI-02151 Espoo, Finland;1. School of Mechanical Engineering, College of Engineering, Pusan National University, 2, Busandaehak-ro 63beon-gil, Geumjeong-gu, Busan 46241, South Korea;2. National Institute of Advanced Industrial Science and Technology, 1-1-1 Umezono, Tsukuba, Ibaraki 305-8563, Japan;3. Department of Mechanical Engineering, School of Engineering, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-8656, Japan |
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| Abstract: | Application of a confocal scanning laser holography (CSLH) microscope to the study of fluid flow in a microgravity environment is described herein. This microscope offers a new, non-intrusive means to determine three-dimensional density gradients within solid objects, fluids, and plasmas, including flames. The index-of-refraction is determined from the phase measurements of the microscope, which is a function of the object temperature and composition. The object being studied is a fluid-cell chamber, which is heated and cooled on opposing walls to produce a steady-state fluid flow due to convection and heat transfer. The holograms are created from the interference of a “known” reference beam with an “unknown” object beam. A three-dimensional amplitude and phase image of the object is produced by the reconstruction of many holograms, where each hologram represents a scanned point inside the object. |
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