Improvement in Phase Analysis using Spatio-Temporal Images for Soret Coefficient Measurements

DOI:10.15011//jasma.36.360306
Int. J. Microgravity Sci. Appl. 2019p360306
Author
I. ORIKASA, T. OSADA, M. TOMARU, S. SUZUKI and Y. INATOMI
Organization
Faculty of Science and Engineering, Waseda University, Department of Applied Mechanics and Aerospace Engineering, Waseda University, Kagami Memorial Research Institute of Materials Science and Technology, Waseda University, Department of Materials Science, Waseda University, Institute of Space and Astronautical Science, Japan Aerospace Exploration Agency, School of Physical Sciences, SOKENDAI (The Graduate University for Advanced Studies)
Abstract
The Soret-Facet Mission was conducted in microgravity to measure the Soret coefficient ST using a two-wavelength Mach-Zehnder Interferometer (2-MZI). Interferometer analysis generally uses procedures like fringe tracing (thinning method) that impede processing speed and accuracy. In the present study, an automated phase analysis using spatio-temporal images was developed based on the simple conversion of intensity I(t) into phase ϕ(t). This automatically analyzes steps, starting with obtaining the spatio-temporal images of moving interference fringes to calculating phase change ∆ϕ(t). It dramatically improved processing speed and larger analyzing areas compared to the thinning method. Applying filters and a threshold to the fringes using suitable conditions—which the method determined automatically and quickly—was confirmed to be efficient for the correct unwrapping of phase.
Keyword(s)
Interferometer, Phase analysis, Spatio-temporal images, Soret effect, Soret-Facet Mission
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Received 30 December 2018, Accepted 23 April 2019, Published 31 July 2019

© The Japan Society of Microgravity Applicaiton

この投稿文は次の言語で読めます: Japanese

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