Shadowgraphy method
Measurement principles:
The shadowgraphy technique (backlighting) is used to visualise and recognise droplets from a spray or bubbles in liquid. The method is based on high resolution imaging with backlight illumination. The technique is independent of the shape and material of the particles and allows to investigate very small sizes an appropriate imaging system and light source.
This technique provides information like size distribution, particle shape and particle velocity.
Advantages
- The technique is non-intrusive
- It gives accurate information about patricle size, form and velocity
- It is possible to use more cameras at one time --> stereo or 3D Shadowgraphy
- It allows to investigate small sizes down to 5 µm
- It gives accurate information about patricle size, form and velocity
- It is possible to use more cameras at one time --> stereo or 3D Shadowgraphy
- It allows to investigate small sizes down to 5 µm
1: Digital camera(s)2: Light source (laser, lamp or LED)
3: Diffused backlight
4: Bubble column
Original Image
Bubble detection
Bubble
sizing
Bubble
trajectories
Basics