Photometric imaging in particle size measurement and surface visualization.

Area of Science:

• Materials Science
• Chemical Engineering
• Analytical Chemistry

Background:

• Traditional particle size measurement methods often require particle dispersion, which is problematic for moist or cohesive samples.
• Photometric techniques offer an alternative approach for characterizing particles without dispersion.

Purpose of the Study:

• To provide insight into photometric particle sizing approaches.
• To highlight the advantages of photometric methods for difficult-to-disperse samples.
• To demonstrate the application of photometric stereo imaging for particle characterization.

Main Methods:

• Utilizing photometric stereo imaging for three-dimensional reconstruction of objects.
• Employing multiple light sources for illumination.
• Applying photometric techniques for at-line and on-line measurements.

Main Results:

• Demonstrated successful at-line measurement of granules.
• Showcased on-line measurement during granulation and dry milling processes.
• Briefly discussed surface visualization and roughness measurements.

Conclusions:

• Photometric particle sizing, especially using stereo imaging, is advantageous for moist or cohesive samples where dispersion is difficult.
• The technique allows for 3D reconstruction and surface analysis, expanding particle characterization capabilities.
• Photometric methods are applicable in various industrial settings, including granulation and milling.