Flow around a canula (Micro PIV)  
 
 
 
Differences between Macro and Micro PIV

Illumination
- Micro PIV is often done without a light sheet. Due to the very small focal depth of   common microscopic lenses the field of view is reduced to a few ¥ìm.
Camera Lens
 - Standard microscope lenses can be used. With confocal optics the focal depth can   be further reduced.
Tracers
 - Fluorescent tracers must be used to reduce interference and diffraction effects.
Light Source
   Could be laser or other triggerable light source. Monochrome light is desirable.
 
Method

Macro PIV

Micro PIV

Illumination

 Light Sheet
 Collimated Laser Beam
 noncoherent Light Source

Lenses

 Often SLR   Camera Lenses
 Microscopes
 Confocal Optic
 Telescopes
Tracer
 Reflecting   Particles
 Fluorescent Particles
Light Sources
 Laser
 Laser
 LED
 
 
Application: Micro PIV
 


[Flow around canula]

 
The flow around a canula was investigated. A commercial microscope was used as camera lens. The collimated laser beam was used instead of a light sheet. Fluorescenttracer particles are minimizing the reflections and interference effects. The measuredregion is about 1200x1200 ¥ìm. The vectors are generated on a 50x50 ¥ìm Grid.

BX51WI.pdf