[1] Meier G E A. Hintergrund-schlierenverfahren: DE, 19942856A1 [P].1999.
[2] Raffel M. Optische Untersuchungen in Technischen Stromungen Unter Besonderer Berucksichtigung Eines Verfahrens Zur Detection Von Dichtegradienten[M]. Germany: Papierflieger, 2001.
[3] Hargather M J, Settles G S. Natural-background-oriented schlieren imaging [J]. Exp Fluids, 2010, 48: 59-68. doi:  10.1007/s00348-009-0709-3
[4] Raffel M, Heineck J, Edward S, et al. Background oriented schlieren imaging for full-scale and in-flight testing [J]. Journal of the American Helicopter Society, 2013, 59: 1-19.
[5] Edward T S, Laura K K, James T H. Measurements of tip vortices from a full-scale UH-60A rotor by retro-reflective background oriented schlieren and stereo photogrammetry[C]// 69th American Helicopter Society Annual Forum, 2013, 13745: 1-20.
[6] Nathanial T S, James T H, Edward T S. Optical flow for flight and wind tunnel background oriented schlieren imaging[C]// 55th AIAA Aaerospace Sciences Meeting. 2017, 4365: 46-47.
[7] James T H, Daniel W B, Edward T S, et al. Background oriented schlieren (BOS) of a supersonic aircraft in flight[C]// AIAA Flight Testing Conference. 2016, 3356: 1-11.
[8] http://www.nasa.gov/centers/armstrong/features/supersonic-shockwave-interaction.html[EB/OL].[ 2019-06]
[9] Michalel A H, Edward A H J. Flow visualization of aircraft in flight by means of background oriented schlieren using celestial objects[C]// 33rd AIAA Aerodynamic Measurement Technology and Ground Testing Conference, 2017, 3553: 1-13.
[10] Wu Yingchuan. Research on theory and application of computational flow imaging[D]. Nanjing: Nanjing University of Science and Technology, 2010. (in Chinese)
[11] Rui Jiabai, Jin Guanchang. A new digital speckle correlation and its application [J]. Acta Mechanica Sinica, 1994, 26(5): 599-607. (in Chinese)
[12] Pan Bing, Xie Huimin, Dai Fulong. An investigation of sub-pixel displacements registration algorithms in digital image correlation [J]. Acta Mechanica Sinica, 2007, 39(2): 245-252. (in Chinese)