The paper introduces hidden grid background oriented schlieren for quantitative study and visualization of natural convection heat transfer. In this technique, the refractive index variation, induced by temperature gradient, is encoded in recorded signal phase through distortion a pattern. (undistorted) pattern implicit (or hidden) light source. Quantitative estimation map obtained windowed Fou...

T HE prediction of laminar–turbulent transition location in highspeed boundary layers is critical to hypersonic vehicle design because of the weight implications of increased skin friction and surface heating rate after transition. Current work in T5 (the California Institute of Technology’s free piston reflected shock tunnel) includes the study of problems relevant to hypervelocity boundary la...

This paper starts from the hypothesis that streetscapes with shorter façade lengths are more pleasant for pedestrians than long and monotonous façades. It analyses four case studies where short were implemented by applying different means of regulation gives insight into an experimental planning example Schlieren, Switzerland. Through investigation these cases, possibilities to regulate length ...

– We describe a self calibrating optical technique that allows to perform absolute measurements of scattering cross sections for the light scattered at extremely small angles. Very good performances are obtained by using a very simple optical layout similar to that used for the schlieren method, a technique traditionally used for mapping local refraction index changes. The scattered intensity d...