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3 October 2023 Experimental investigation into the effects of shock waves on Shack-Hartmann wavefront sensor measurements
Matthew R. Kemnetz, Matthew Kalensky, Thomas E. DeFoor, Mark F. Spencer
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Proceedings Volume 12693, Unconventional Imaging, Sensing, and Adaptive Optics 2023; 1269314 (2023) https://doi.org/10.1117/12.2676878
Event: SPIE Optical Engineering + Applications, 2023, San Diego, California, United States
Abstract
Shock waves are a commonly observed phenomenon in transonic and supersonic flow. These nearly discontinuous flow features form as a result of flow disturbances propagating faster than the local speed of sound. Across a shock wave, flow properties such as pressure, temperature, and density can change dramatically. In this paper, the effects of the near discontinuous change in density due to the shock wave on Shack–Hartmann wavefront sensor (SHWFS) measurements are studied experimentally. Experiments were conducted in the Mach 2 wind tunnel located in the Aero-Effects Laboratory at Kirtland, AFB. To generate the oblique shock wave, a wedge model was placed in the tunnel. Two dimensional, time-resolved wavefront measurements were collected simultaneously with a SHWFs and a digital holography wavefront sensor (DHWFS). In this manner, results from the two wavefront sensor techniques could be compared and contrasted. It is shown that the shock wave caused significant higher order distortion within the SHWFS lenslets. Significant lenslet beam spreading and bifurcation were observed in the raw SHWFS intensity images. When compared with the DHWFS measurements, the SHWFS measurements under predicted the phase distortion caused by the shock by up to approximately 1π.
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(2023) Published by SPIE. Downloading of the abstract is permitted for personal use only.
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Matthew R. Kemnetz, Matthew Kalensky, Thomas E. DeFoor, and Mark F. Spencer "Experimental investigation into the effects of shock waves on Shack-Hartmann wavefront sensor measurements", Proc. SPIE 12693, Unconventional Imaging, Sensing, and Adaptive Optics 2023, 1269314 (3 October 2023); https://doi.org/10.1117/12.2676878
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KEYWORDS
Wavefront sensors
Optical path differences
Discontinuities
Spatial resolution
Digital holography
Adaptive optics
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