From Event: SPIE Optical Engineering + Applications, 2017
This paper presents results from simultaneous measurements of fluid density and the resulting wavefront distortions in a
sonic underexpanded jet. The density measurements were carried out using Rayleigh scattering, and the optical
distortions were measured using a wavefront sensor based on phase shifting interferometry. The measurements represent
a preliminary step toward relating wavefront distortions to a specific flow structure. The measured density field is used
to compute the phase distortions using a wave propagation model based on a geometric-optics approximation, and the
computed phase map shows moderate agreement with that obtained using the wavefront sensor.
Jacob George, Thomas Jenkins, James Trolinger, Cecil Hess, and Benjamin Buckner, "Simultaneous measurements of density field and wavefront distortions in high speed flows," Proc. SPIE 10410, Unconventional and Indirect Imaging, Image Reconstruction, and Wavefront Sensing 2017, 1041006 (Presented at SPIE Optical Engineering + Applications: August 09, 2017; Published: 6 September 2017); https://doi.org/10.1117/12.2275883.
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