Laser Doppler Anemometry

[mm391]

Hello,

I was hoping someone might be able to help explain what the following are, I have found many articles but non which explain it in Lehman's terms:

Probe Volume
Bragg Cells

Also can someone explain how the effect of varying beam angle is not under our control, but it can tell us about uncertainties?

Many Thanks

M

 

[Baluncore]

http://en.wikipedia.org/wiki/Laser_Doppler_velocimetry

Bragg Cell = Acousto-optic modulator http://en.wikipedia.org/wiki/Bragg_Cell

Probe volume is the volume of fluid that affects the light.