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The calibration of a multi-camera system is a crucial step of volumetric flow measurements with photogrammetric methods. Conventional calibration methods are based on recording hardware targets, which are placed in the cameras fields of view. Calibrating in confined spaces with those methods is associated with an increased technical or mechanical effort. This work presents a calibration method without the use of a hardware target. Instead, crossing laser beams are introduced into the volume for creating unique calibration points. The underlying algorithms discussed in this paper for detecting the laser beams are: Ransac algorithm, Template Matching (via cross correlation) and Probabilistic Hough Transformation. The algorithms are tested with experimental data and synthetic data.
Supplemental material and supporting information for the publication
UWRM soll die Siedlungswasserwirtschaft mit den zur Ver- und Entsorgung genutzten bzw. belasteten Wasserkompartimenten in Verbindung bringen. Ziel des Wasserressourcenmanagements in urbanen Regionen muss es sein, Wasserressourcen quantitativ und qualitativ in der nötigen Dynamik sowie die Interaktion mit der technischen Infrastruktur zeitabhängig abzubilden und Ansätze zur effizienten Bewirtschaftung aufzuzeigen. The aim of urban water resources management is, to describe the water related mass flows and their interactions between technical infrastructure and the natural environment elaborately. This should improve the conditions for identifying reasonable and sustainable management solutions.
In high strain rate forming processes two superposing and opposing effects influence the flow stress of the material: strain rate hardening and thermal softening due to adiabatic heating. The presented FE-model and experimental results are based on https://doi.org/10.3390/app12052299 where uniaxial tensile tests at different high strain rates are analyzed experimentally and numerically to understand the influence of adiabatic heating of the workpiece during deformation under high-speed loading. A thermal camera and a pyrometer were used for temperature measurement in the fracture region in addition to the measurement of force and elongation. The numerical simulations are carried out in LS-Dyna using the GISSMO model for modeling damage and failure.
This data collection contains the raw data of the creep tests on cylindrical specimens.