Optimum contrast in single mirror off-axis Schlieren system

  • Gilbert Moises Oca National Institute of Physics, University of the Philippines Diliman
  • Percival Almoro National Institute of Physics, University of the Philippines Diliman

Abstract

Schlieren technique reveals the refractive index variations caused by temperature or pressure gradients to visualise fluid non-uniformities and dynamics, quantitatively measure gas density, and observe transparent solid deformities. The simplest and relatively least expensive Schlieren setup is the single-mirror off-axis Schlieren apparatus with knife-edge. We investigate the physical conditions of Schlieren parameters that will result to maximum gray-level contrast. In the setup, the distance measured from the concave mirror's vertex to its focal point is F = 64 inches. To achieve high contrast images, experiment revealed that the object distance must be ≈F and the knife edge is positioned at ≈2F while camera is focused within the range 0 to F.

Published
2018-05-29
How to Cite
[1]
G. Oca and P. Almoro. Optimum contrast in single mirror off-axis Schlieren system, Proceedings of the Samahang Pisika ng Pilipinas 36, SPP-2018-PC-43 (2018). URL: https://paperview.spp-online.org/proceedings/article/view/SPP-2018-PC-43.
Section
Poster Session C (Mathematical Physics, Optics, and Interdisciplinary Topics)