Journal: Scientific Reports
Article Title: Operando high speed near infrared imaging during laser sintering of nanoparticles for time and space resolved temperature measurements
doi: 10.1038/s41598-026-37445-7
Figure Lengend Snippet: (a) Measured NIR intensities of a TiO 2 sample at different temperatures (red markers) used for temperature calibration. A least-square algorithm is used to fit the Sakumi-Hattori function (blue, solid line). The dark red data point also belongs to TiO 2 , but is not used for calibration, as the intensity is close to the lower detection limit. Measured intensities at different temperatures of the Si 3 N 4 ceramic heater are also shown (black markers). The temperature limits for calibration are marked as gray lines. The blue dashed line is at 70% of the full well capacity, where non-linear behavior of the detector may occure. (b) NIR (false color) image of an illuminated microscope scale. The ruler has a length of 1 mm and the distance of the bars provide a resolution of 10 μm. The colorbar indicates the measured NIR intensity (c) The intensity profile of the reflected NIR radiation. As inset is shown a magnified region of the ruler. The IFOV of 1.34 μm per pixel of the imaging system, determined by the magnification ( m = 5x) of the microscope optics and the pixel pitch, fit accurately with the scale and the 10 μm increments are resolved.
Article Snippet: The camera is equipped with a NIR optimized infinity corrected objective (Plan Apo NIR 5x, Mitutoyo) with a magnification of 5 (Fig. a).
Techniques: Microscopy, Imaging