Abstract

A background-oriented schlieren (BOS) system is developed with two benefits over traditional BOS systems. First, the dot pattern required for BOS is projected onto a retroreflective background instead of being painted/printed onto the material itself, allowing for on-the-fly updates to the size and distribution of the dot pattern. Second, a reference image is acquired for every flow image so that real-time BOS images can be displayed, and a flow-off reference image need not be acquired if the projected dot pattern is changed during a run for BOS signal optimization. The system can be made very compact, can be converted quickly to operate as a shadowgraph system, and can be integrated with polarization optics that reduce glare/reflections from wind tunnel windows.

Nonlinear estimation of pressure projection of ultrasound fields in background-oriented schlieren imaging

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Assessment of some experimental and image analysis factors for background-oriented schlieren measurements

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Isotropic resolution plenoptic background oriented schlieren through dual-view acquisition

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Tracking background-oriented schlieren for observing shock oscillations of transonic flying objects

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Direct background-oriented schlieren tomography using radial basis functions

Huajun Cai, Yang Song, Yunjing Ji, Zhenhua Li, and Anzhi He
Opt. Express 30(11) 19100-19120 (2022)