• Title/Summary/Keyword: 홀로그래피 간섭토모그래피

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Analysis of Three-Dimensional Natural Convection Using a Holographic Interferometric Tomography (홀로그래피 간섭 토모그래피를 이용한 3 차원 자연대류 해석)

  • Shim, Dong-Sik;Lee, Soo-Man;Kang, Bo-Seon;Cha, Dong-Jin;Joo, Won-Jong
    • Proceedings of the KSME Conference
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    • 2001.06d
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    • pp.497-502
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    • 2001
  • Three-dimensional natural convection from a discrete flush-mounted circular heat source on the bottom of a cubic enclosure was studied by using a holographic interferometric tomography. The heat source was located at the off-center of the bottom plate so that three-dimensional temperature field can be achieved. A set of multidirectional holographic interferogram was recorded by employing a double-reference beam, double-exposure holographic technique in order to eventually reconstruct the temperature fields. The recorded interferometric data appear good enough to be further processed to extract optical pathlength data from them and finally reconstruct the temperature fields. A complete analysis of the temperature fields including the field reconstructions and comparison with thermocouple measurements is underway and will be reported shortly.

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Development of a Holographic Interferometric Tomography System and Its Application to Three-Dimensional Natural Convection (홀로그래피 간섭 토모그래피 개발 및 3차원 자연대류 열전달에의 적용)

  • Lee, Soo-Man;Kang, Min-Gu;Cha, Dong-Jin;Joo, Won-Jong;Kang, Bo-Seon
    • Proceedings of the KSME Conference
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    • 2003.04a
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    • pp.1609-1614
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    • 2003
  • In this study, a practical holographic interferometric tomography system, which is instantaneous and non-contact for measuring three dimensional flow field, was developed. The system consists of holographic recording/reconstruction system, fringe analysis code and computational tomography code and it is developed with Gill environment for general users. The developed system was applied to three-dimensional natural convection from a discrete flush-mounted circular heat source on the bottom of a cubic enclosure. The heat source was located at the off-center of the bottom plate so that three-dimensional temperature field can be achieved. A set of multi-directional holographic interferograms was recorded by employing a double-reference beam, double-exposure holographic technique. Optical pathlength data were extracted from the recorded interferometric data and finally three dimensional temperature field inside the cube was reconstructed.

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Holographic interferometric tomography for reconstructing a three- dimensional flow field (3차원 유동장 측정용 홀로그래피 간섭토모그래피)

  • ;S. S. Cha
    • Korean Journal of Air-Conditioning and Refrigeration Engineering
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    • v.11 no.6
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    • pp.749-757
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    • 1999
  • Holographic interferornetric tomography can provide reconstruction of instantaneous three dimensional gross flow fields. The technique however confronts ill-posed reconstruction problems in practical applications. Experimental data are usually limited in projection and angular scanning when a field is captured instantaneously or under the obstruction of test models and test section enclosures. An algorithm, based on a series expansion method, has been developed to improve the reconstruction under the ill-posed conditions. A three-dimensional natural convection flow around two interacting isothermal cubes is experimentally investigated. The flow can provide a challenging reconstruction problem and lend itself to accurate numerical solution for comparison. The refractive index fields at two horizontal sections of the thermal plume with and without an opaque object are reconstructed at a limited view angle of 80" The experimental reconstructions are then compared with those from numerical calculation and thermocouple thermometry. It confirms that the technique is applicable to reconstruction of reasonably complex, three-dimensional flow fields.elds.

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