Comparison of experimental (top) and numerical (bottom) images of a detonation wave propagating in a 2H2-O2-12Ar mixture. Initial conditions: T1=295 K and P1=20 kPa. a) and d): Schlieren images. b) and e): OH PLIF images. c) and f): superimposed Schlieren and PLIF images. Experimental PLIF image height is 60 mm. Simulations were obtained in a 13.6 mm wide channel. PLIF: planar laser induced fluorescence.