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Qualitative Real-Time Schlieren and Shadowgraph Imaging of Human Exhaled Airflows: An Aid to Aerosol Infection Control

Figure 3

Typical position of a single subject in front of the schlieren mirror.

The exhalation puffs can be seen as disturbances in the ‘texture’ in front of the head (images obtained using a Nikon D7000 SLR in HD 1920×1080 live video mode).

Figure 3

doi: https://doi.org/10.1371/journal.pone.0021392.g003