Three-Dimensional Optical Tomographic Imaging of Supersonic Jets through Inversion of Phase Data Obtained through the Transport-of-Intensity Equation
H. Thayyullathil, R.V.V.L. Langoju, P. Renganathan, R.M. Vasu, R. Kanjirodan, L.M. Patnaik
Applied Optics, vol. 43, no. 21, pp. 4133-4141, July 20, 2004.
We report experimental results of quantitative imaging in supersonic circular jets by using a monochromatic light probe. An expanding cone of light interrogates a three-dimensional volume of a supersonic steady-state flow from a circular jet. The distortion caused to the spherical wave by the presence of the jet is determined through our measuring normal intensity transport. A cone-beam tomographic algorithm is used to invert wave-front distortion to changes in refractive index introduced by the flow. The refractive index is converted into density whose cross sections reveal shock and other characteristics of the flow.
@ARTICLE(http://bigwww.epfl.ch/publications/thayyullathil0401.html, AUTHOR="Thayyullathil, H. and Langoju, R.V.V.L. and Renganathan, P. and Vasu, R.M. and Kanjirodan, R. and Patnaik, L.M.", TITLE="Three-Dimensional Optical Tomographic Imaging of Supersonic Jets through Inversion of Phase Data Obtained through the Transport-of-Intensity Equation", JOURNAL="Applied Optics", YEAR="2004", volume="43", number="21", pages="4133--4141", month="July 20,", note="")