Developing the Modular Background-Oriented Full-Scale Schlieren Technique

This article mainly presents the full-scale schlieren technique using modular background-oriented light source instead of the retroreflective method. Moveover, this article is also focused on investigating sensitivity influence of the cutoff light percentage by the cutoff grid. An unit background-oriented light source is composed of the fluorescent lamps of Philips-865, the atomizing film, and the linear grating mask in this work. The applied cutoff grids are with 50, 60, 70, 80, and 90% of the cutoff light percentage respectively. The results show that a cutoff grid with 90% cutoff light for the conventional Z-arrangement schlieren technique and a cutoff grid with 60% cutoff light for the full-scale schlieren technique receives the best visualization.