Schlieren Knife-Edge Placement

How do you know where to place your knife-edge for your Schlieren setup? In this video, I'll show you what happens when you put the knife-edge in front of, behind, and exactly at the focus point. After watching, you'll be able to place your knife-edge in the best possible position for your own setup.

===== RELEVANT VIDEOS =====
How To: Build Your Own Schlieren Setup
https://goo.gl/TzM8vr

How To: DIY Laser Schlieren
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Видео Schlieren Knife-Edge Placement канала JoshTheEngineer