Acuracy aspects of a three dimensional particle tracking velocimetry based on photogrammetry

Gävle University College
KTH Royal Institute of Technology, Department of Build Environment, Stockholm, Sweden
KTH Royal Institute of Technology, Department of Build Environment, Stockholm, Sweden

The purpose of this report is to investigate the accuracy of determining three dimensional air movements in ventilated rooms by means of the photogrammetrical methods. Two approaches to determine the accuracy have been used. The first one is based on analytical calculation which analysis the relations between the image coordinates and the object coordinates. The second method is based on simulation by introducing random errors to the image coordinates and calculation of the object points. A relatively close agreement between the errors obtained analytically and by simulation has been achieved for the typical object of size 3x3x0.3 m. Some other aspects like optimisation o f the network, a selection of a suitable mathematical model of the process are discussed in this paper. Finally recommendations for further research and development are presented.

1. Adrian, R.J ’’Particle-Imaging techniques for experimental fluid Mechanics”, Annu. Rev. Fluid. Mechanics: Vol. 23, pp. 261-304.
2. Hazay, I (1970) ’’Adjusting Calculation in surveying”, 1970,Akademiai Kaido, Budapest.
3. Muller, D and Renz, U (1996) ’’Determination of All Airflow velocity Components by a Particle IMAGE-Velocimetry System (PIV)”. Proceedings Roomvent’96 Vol 2. July 18 Yokohama, JAPAN. 
4. Scholzen, F (1997) ’’Bestimmung des dreidimensionalen Geschwindigkeitsfeldes in Raumen durch quantitative Stromungsvisualisierung”, ETH Zurich.
5. Aslund, A and Engberg H (1993) ’’Fotogrammetrisk 3-D kartlaggning av luftrorelser і ett rum”, Hogskolan Gavle/Sandviken, The National Swedish Institute for Building Research.