To choose the best camera to investigate the behaviour of concrete when subjected to high impact loading – the Dresden researchers compared experimental images on their samples from the Kirana with those taken by two alternative cameras for Digital Image Correlation (DiC) measurement analysis. This comparative evaluation is subject of a detailed paper published by the University of Dresden – see https://opg.optica.org/ao/fulltext.cfm?uri=ao-63-2-467&id=545419.
The researchers describe how evaluation of high-speed camera image sequence analysis results in concrete material testing under high-impact loading requires careful consideration of the effect of the image quality on the measurement accuracy and on the potential of the geometric measurements derived from the image sequences. To achieve accurate measurements, using Digital Image Correlation, the researchers evaluated the performance of three ultra-high speed cameras (Specialised Imaging Kirana, Shimadzu HPV-X2 and Vision Research TMX 7510) to analyse the deformation of concrete specimens before and after main crack formation in bending and compression tests. The published results from the head-to-head experimental tests and correlation analysis results showed technology limitations that affected image quality could be mitigated to a level where significantly higher spatial resolution images provided better results overall.
The Kirana is a true ultra-high-speed video camera that combines the flexibility of a video camera with the speed and resolution approaching those only available with framing cameras. The unique custom design sensor employed by the Kirana offers 180 images at capture speeds up to 7 million images/second at full resolution.
