X-Ray Stereography Kindergarten.
This article is a continuation of "X-Ray Microscopy Kindergarten.".
Here, we see a stereo pair (approx. +/- 25 deg. one-axis rotation of the object from the horizontal plane, while film is stationary) of the device from before.
The vias are clearly distinguishable.
Exposure: 70 sec. @ 34kV; 0.3mA + 2x beam spread; film: "Eco-30".
These posts are awesome, please continue!
Any chance you might tell us a bit about the lab setup you used to produce these? Would be very interested.
Only time I ever had to x-ray a PCB I wound up taking it to my dentist and pleading with him. Got some really nice jpegs showing the bridged BGA solderballs. Not really practical to do that more than once a year or so though.
Dear Felonious Vagrancy,
"Faxitron MX20". Relatively cheap on the surplus market, but quite heavy, thick lead-shielded cabinet, resembles old-fashioned safe.
If you get one, be sure to use a "pancake" Geiger and verify that it doesn't leak.
Initially I thought of using a dental unit, but they tend to not have adjustable voltage, and shoot into the open air, you will inevitably eat some reflected beam if using one with any regularity.
Yours,
-S