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="")