Abstract
Strong shock waves around 10km/s are generated in low-density (13.3Pa) air by using a free-piston, double-diaphragm shock tube with test section of 40mm×40mm. Two-dimensional pictures of radiation intensity behind the shock waves are taken at the test section, and analyzed by combined usage of an image converter camera and an image processor. Contour plots and time histories are derived from the radiation images by image processing for several shock speeds around 10km/s. The contour plots gives us informations about two-dimensional features for radiation intensity, and the time histories reveal transition characteristics on double peaks in radiation profile around 10km/s.
