Basics of optical flow measurement methods


Brands, Thorsten © Copyright: Lehrstuhl fuer Technische Thermodynamik der RWTH Aachen


Thorsten Brands

Senior Engineer / Measurement Systems Engineering


+49 241 80-90466



The great advantage of optical methods for measuring flows is that they do not influence the flow itself during the measurement. Through the targeted use of optical components and clever evaluation algorithms, it is possible to characterize velocity profiles in three-dimensional space.

The lecture gives an introduction to optics (light sources, optical assemblies and detectors) so that the basic knowledge in the field of optics for the topics of the lecture is developed at the beginning. Based on these fundamentals, some common and some more exotic optical measurement methods are presented.

The methods presented include:

  • Particle Image Velocimetry (PIV)
  • Gaseous Image Velocimetry (GIV)
  • Laser Flow Tagging (LFT)
  • Laser Doppler Anemometry (LDA)
  • Doppler Global Velocimetry (DGA)
  • Filtered Rayleigh Scattering (FRS)

Lecture and Exercise

Lecture : 2 hours
Tutorials : 2 hours
Semester : Summer Term
Language : German


Further information can be found at RWTHonline.


Examination Information

The exam takes the form of an oral examination. If you have any questions, please contact Mr. Brands: .