system comprises the hardware that positions the sample, source and detector to acquire 2D projection data, as well as an algorithm to reconstruct a 3D volume image from data generated by a custom Nikon Metrology 225/450kV X-ray scanner.
The voiding percentage on the ground pad of QFN/BTC component at U314 was measured using the laminography
x-ray system, and the results shown as box plots in FIGURE 8.
Both CT and tomosynthesis are distinct from laminography
: They acquire all the information to develop any view from the same set of images.
, an operator makes a series of x-ray images at different angles and uses computer algorithms to slide the images relative to one another so that one plane of the objects is in focus.
Various testing technologies exist to ensure a sound electrical connection is created, but automated x-ray laminography
is the only available technology that can ensure the through-hole solder joint meets the IPC-A-610 specifications of barrel fill.
The traditional approach to 3-D AXI is based on laminography
, a method widely used to inspect double-sided boards that requires motion of the X-ray source, detector, and board.
On area array packages, obviously the use of things like X-ray laminography
and things like that have also become very important.
3-D x-ray laminography
or planar computed tomography (PCT) combines the capabilities of 2-D x-ray and endoscopic technology with added features.
Using the 3-D laminography
system for subsurface scans verifies the correct positioning of the connector pins.
Most automated x-ray inspection (AXI) systems deployed today use laminography
, a mechanically complex imaging system that moves a steerable x-ray beam in synchronization with a moving image detector (x,y) and PCB (z-axis).
Today, 3-D automated X-ray test (AXT) through laminography
is popular in the PC assembly industry.
* Compare and correlate the voiding measurement data between AXI laminography
and transmission x-ray systems.