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DescriptionShockwave pattern around a T-38C observed with Background-Oriented Schlieren photography (1).jpg
English: Air-to-air photography of a
Northrop T-38 Talon in
supersonic flight over the
Mojave Desert reveals air density changes caused by flow regime transition around the aircraft, and the turbulent exhaust of the aircraft’s jet engines. This photo was acquired using a technique named Air-to-air Background-Oriented Schlieren (AirBOS). The process involves imaging with a high-speed camera mounted on the bottom of a
Beechcraft B-200 King Air aircraft while the T-38C passes underneath. The pattern formed by the desert ground underneath the aircraft is filmed separately, and then removed digitally from the captured images during post-processing. This reveals the distortions created by the shockwaves, which result from the change in the air’s refractive index caused by density changes.
Deutsch: Luftbildfotografie einer
Northrop T-38 Talon beim
Überschallflug über der
Mojave-Wüste. Sie zeigt Änderungen der Luftdichte, die durch die Strömungsbeeinflussung durch das Flugzeug und die turbulenten Abgase der Triebwerke des Flugzeugs verursacht werden. Dieses Foto wurde mit der "AirBOS"-Technik (Air-to-Air Background-Oriented Schlieren) aufgenommen. Der Prozess umfasst die Bildgebung mit einer Hochgeschwindigkeitskamera, die an der Unterseite einer
Beechcraft B-200 King Air angebracht ist, während die T-38-Talon unter ihr fliegt. Das vom Wüstenboden unter dem Flugzeug gebildete Muster wird separat aufgenommen und dann während der Nachbearbeitung digital aus den diesen Bildern entfernt. Dies offenbart die durch die Stoßwellen verursachten Verzerrungen, die sich aus der Änderung des Brechungsindex der Luft aufgrund von Dichteänderungen ergeben.
NASA & US Air Force: J.T. Heineck / Ed Schairer / Maj. Jonathan Orso / Maj. Jeremy Vanderhal
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The NASA website hosts a large number of images from the
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The
SOHO (ESA & NASA) joint project implies that all materials created by its probe are copyrighted and require permission for commercial non-educational use.
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