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The underexpanded sonic jet issued from an axisymmetric convergent nozzle are experimentally investigated in which the nozzle is operated at a pressure ratio of 4.0 to produce a Mach disk in the jet plume. Multidirectional rainbow schlieren pictures of the jet acquired by rotating the nozzle about its longitudinal axis in equal angular intervals are utilized to reconstruct the jet three-dimensional density fields with both of the Abel inversion and convolution back-projection algorithms. Thedoi:10.1299/transjsme.19-00096 fatcat:dzstztwalvbpfbkg5llx57a5y4