Paper Conference

Proceedings of BauSim Conference 2022: 9th Conference of IBPSA-Germany and Austria


Sensitivity Analysis of a Large-Scale Schlieren Imaging Setup When Measuring Indoor Airflow

Amayu Wakoya, Lia Becher, Conrad Voelker

Abstract: In this study, the parameters of the large-scale schlieren setup at Bauhaus-University Weimar was analyzed and its sensitivity was determined. For the analysis of the sensitivity, convective indoor airflow measurements were used. Accordingly, the minimum detectable density gradient of the schlieren setup was calculated. Similarly, the setups output (schlieren image illuminance, background illuminance, and illuminance gain due to refraction) were quantified. Finally, the setups sensitivity was mathematically determined as the rate of change of schlieren output contrast with respect to the refraction angle. Further, the relationship between schlieren cutoff , refractive index, illuminance, and contrast of schlieren image were identified.