Open AccessDigital processing of shadowgraph images taking into account the diffraction of light at a shock front
Author(s) -
И. В. Мурсенкова,
M. Yu. Timokhin,
Mikhail Tikhonov,
A Militsina,
A. A. Kuznetsov
Publication year - 2021
Publication title -
journal of physics. conference series
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.21
H-Index - 85
eISSN - 1742-6596
pISSN - 1742-6588
DOI - 10.1088/1742-6596/2127/1/012001
Subject(s) - shadowgraph , optics , shock wave , schlieren , shock (circulatory) , shock tube , physics , diffraction , acoustics , mechanics , medicine
The aim of the study is to determine the shock wave position in experimental shadowgraph images and to evaluate the accuracy by digital image processing. The experimental images were obtained with the shock tube with a rectangular channel. The shadowgraph optical system formed a parallel light beam. It passed through the plane-parallel quartz glasses of the shock tube test section. The process synchronization system at the facility allows registering the shadowgraph images of unsteady flows with shock waves with a high-speed camera or with a single frame camera. The obtained spatial intensity profiles were used to determine the coordinates of gas-dynamic discontinuities at different stages of the flow evolution. shadowgraph patterns were analysed taking into account diffraction at the shock front in case of a laser light source.