Figure 7
Measurement of printed circuit board (PCB) sample using the low-cost LF-FD-OCT system. (a) Volume rendering image of the PCB sample. The two interfaces are corresponding to air/the PCB’s conformal coating and the conformal coating/the PCB’s solder mask interfaces. (b) B-scan cross-sectional image in the x–z plane extracted from the position indicated by the green line in (a). The conformal coating layer is segmented and its upper and bottom boundaries are marked with red and green solid lines. (c) Thickness map of the conformal coating.
