Issue link: https://iconnect007.uberflip.com/i/1166358
SEPTEMBER 2019 I PCB007 MAGAZINE 91 Example 3: 3D Imaging of Adhesives and Other Dispensed Materials The line confocal method can be used to image transparent, translucent, and opaque structural and pressure-sensitive adhesives in liquid, paste, and solid forms. Shape, size, cross-sectional area, height, width, volume, surface roughness, and position of glue dots and lines can be measured with the system's sensors. The technology works equally well on sealants and other dispensed materials. Mate- rials can be characterized by the system's sen- sors both in laboratory and production condi- tions in real time. The technology works well in challenging applications, such as imaging transparent glue dots on transparent or mirror-like surfaces. Fig- ure 26 shows a 3D view of an approximately 85-µm high bead of transparent cyanoacrylate glue on a glossy transparent glass substrate. The bead was scanned with a line confocal sensor. Figure 27 depicts a 2D top view of the same bead with its automatically calculated volume and height values. Figure 23: Zoomed-in 3D view of the lines. Figure 24: Microscope photo of landing pads for a 0402-size component. Figure 25: 3D view of the pads. Figure 27: Volume and height of a glue bead. Figure 26: A bead of cyanoacrylate glue on a glass surface.