Figure 1
From: Non-invasive 3D and 360° optical imaging of micro-particles
A 3D presentation of the setups in this study for real time size-shape monitoring, focus-stacking and 3D-360° photogrammetry of micro-particles. Left: the assembly can be used as a process analytical technology for imaging moving particles at high quality with pulsed camera and front-inclined white LED light. Middle: imaging of particles with white LED backlight with the xyz movement of particles for views from different angles (by rotating the particle or tilting the slide) as well as focus-stacking operations. The backlight collimating lens can be moved/rotated to adjust the backlight rays (e.g., condense, diffuse, direct, distribute, etc) depending on the optically active particle’s shape and features, particularly to optimize the surface contrast. Right: imaging of phosphorescent particles in UV. Particles inside a glass capillary tube (10 µm wall) are imaged at 360° for 3D modelling.
