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If you happen to’re used to working by way of a microscope, you’ve in all probability observed that the angle of the sunshine vastly impacts how your workpiece seems. Most of us want the comparatively flat lighting supplied by a hoop mild, however variable angle facet lighting will be helpful too, particularly once you’re peering inside ICs to ensure the silicon is what it’s alleged to be.
That’s what [Bunnie] is engaged on lately together with his Undertaking IRIS, brief for “Infrared in situ,” a non-destructive technique for wanting inside chip packages. The approach depends on the truth that silicon is clear to sure wavelengths of sunshine, and that some fashionable IC packages expose the underside of the silicon die on to the skin world. Preliminary exams indicated that the angle of the incident IR mild was necessary to visualizing options on the steel interconnects layered onto the silicon, so [Bunnie] designed a two-axis mild supply for his microscope. The rig makes use of curved steel tracks to information a pair of IR mild sources by way of an arc centered on the point of interest of the microscope stage. The angle of every mild supply relative to the stage will be managed independently, whereas the entire thing can swivel across the optical axis of the microscope to regulate the radial angle of the lighting.
The mechanism [Bunnie] designed to perform all that is fairly advanced. Zenith angle is managed by a lead screw driving a connecting rod to the lights on their information tracks, whereas the azimuth of the lights is managed by a separate motor and pulley driving a custom-built coaxial bearing. The entire optical meeting is mounted on a Jubilee movement platform for XYZ management. The temporary movies under present the lights being put by way of their paces, together with how altering the angle of the sunshine impacts the view inside a chip.
https://bunniefoo.com/iris/2024/final-loop.mp4
https://bunniefoo.com/iris/2024/gf180-5x-psi_small.mp4
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