Basic 3DX Concept

Basic 3DX Concept
 A Stationary Beam is a “Transmission X-ray”.

Basic 3DX x-ray Concept

X-Ray Concepts
There are two basic ways to image an X-Ray.

• Transmission X-Ray
• Laminography
 

transmission x-ray

Transmission X-Ray:
The X-ray beam that most people are familiar with is the kind used by a doctor or dentist.
These are "transmission" X-rays and regardless of the layering of the objects being xrayed
produce an image of all features.
In the example shown:
• The printed circuit board is positioned between the X-ray source and the
Detector (film).
• There are devices on the top of the panel and
• There are devices on the bottom of the panel.
• The X-rays pass through the devices and the printed circuit board.
• Solder, being a heavy metal, absorbs most of the x-ray energy hitting it.
• The fiberglass of the panel attenuate very little energy.
• The energy that makes it through the panel is collected by the detector.
• This produces an image showing top and bottom devices together, but at
slightly different magnifications.

 basic 3d x-ray laminography

Basic 3DX Concept
A rotating beam is a “Laminography X-ray”.
Laminography X-ray Beam
The Agilent 5DX uses X-ray Laminography.
The X-ray beam is rotating. Deflection coils in the tube cause the photon stream
to pass through the panel at a rotated angle.
Above, four locations are shown, during test, the image is being collected during
the entire 360degree sweep, but examine these four locations:
• The X-rays leave the X-ray tube at position 1
- The beam passes through the device on top of the panel.
- The beam passes through the panel
- The beam passes through devices on the bottom of the panel.
- The image is collected by a detector at its position 1.
• This is repeated at positions 2, 3 and 4.
What is going to be visible?
• All devices on the plane of focus.
• None of the devices above or below the plane of focus.

basic 3d x-ray for PCBA