International audienceAirflow field measurement plays a significant role in creating a thermally comfortable indoor environment, by providing adequate quantitative information of indoor air distribution and local air velocity. In recent years, the Particle Tracking Velocimetry (PTV) technique has gradually become a promising and powerful tool for indoor airflow field measurement. This paper firstly gives an overview of the equipments and methods involved in typical PTV applications to indoor environments, and then introduces related applications of PTV for measuring indoor airflow fields. The Particle Streak Velocimetry (PSV) technique for indoor airflow measurement is also introduced. This paper shows how the quantitative and detailed turbulent flow information obtained by PTV measurement is critical for analyzing turbulent properties and developing numerical simulations. The limitations and future developments of PTV and PSV techniques are also discussed

The paper describes an in-line viewing system for use in stereo vision and its practical implementation in 3-component, PIV studies in a wind tunnel. The transformation equations, relating image co-ordinates to object position, are developed and the significance of view matching and quantisation in error propagation are discussed and the resulting errors estimated. Directional ambiguity is resolved by pulse intensity coding and the use of an intensity sensitive image tracking algorithm.

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