Recurrence quantification analysis of intermittent spontaneous to forced dripping transition in laser droplet generation

High-speed camera thermometry of laser droplet generation

“…The field of view was sized approximately 2.7 mm x 5.4 mm. For comparison, FLIR images of the same process [5][6][7][8][9] only had a resolution of 32 x 64 pixels (pixel size 46 µm) and a frame rate of 1428 frames per second, despite covering a smaller field of view (1.5 mm x 3.0 mm). Under such conditions, the useful temperature measurement range was between 1350°C and 1950°C, with the accuracy of the method estimated to within 2% of the measurement range width [19].…”

“…Due to the presence of multiple flow phases and the very high temperatures of melt droplets (often in excess of 2000°C), only non-contact methods can be used to measure the temperature. Non-contact temperature measurements are most commonly performed by pyrometers or infrared cameras [5][6][7][8][9], but these devices have several operating limitations. Pyrometers are only capable of single-point temperature measurements, while the infrared cameras, though capable of measuring instantaneous temperature fields, are not well-suited for application in high-speed processes due to their limited spatial resolution and dynamic response as well as the high cost.…”

Nonlinear Analysis of Mineral Wool Fiberization Process

“…For a more detailed study of our system's recurrent properties, we employed recurrence quantification analysis [23,24]. The time series of vy was divided into 6 sections and the following quantification measures were chosen:…”