CMP at Tufts
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Transcript of CMP at Tufts
CMP at Tufts
Dan Apone
Issue #1
Cameras had had enough
Random dots on images
So old that to fix them would require all new internals
New cameras researched
Firewire Cameras
Evolution VF digital camera
12 bit Firewire connection to
PC Prewritten Labview
VI’s to control camera
Camera Mounting
New cams didn’t fit on old camera rig Picture taken from severe angle; only part of
image would be in focus Solution:
New mounting pointAttached to 80/20 beam, not rickety drum stand
Actual Images
Newest camera location
Wafer mount updates
Allows placement of mirror for new camera location
Good temp solution, could be more rugged
Laser info
Laser wouldn’t fire, called Big Sky Laser for help
Our thermal sensor was busted
Ordered new piece Thanks to Scott’s
technical skills, it was installed within a few hours
Even more laser fun…
Laser still wouldn’t fire Laser wanted pulses sent at 10 Hz Pulses sent at 10 Hz, still nothing Big Sky Laser said “use serial connection” Serial worked well but we would now have to
listen for output pulse from laser
Solution: circuits
Calibrations
Leftover slides seemed sloppily assembled
Severe curvature of slides would be nice to avoid
Newest calibration?
1mm thick microscope slide props up edge of wafer
Allows for typical downforce
Slurry interacts with asperities as during polishing run
Software Updates
Labview controls it all now: laser + cameras
Programs now calculate image ratio, standard deviation, friction value, and time of laser pulses
All functions updated to Labview 7
Most recent questions… What effect is the pad having on our measurements?
Setup Concerns
Drill press getting a bit sticky Force table instead of separate downforce
and friction measurements Camera views only a dime sized portion of
the wafer…(460 pixels per cm on wafer/platen)
To Infinity…and Beyond!
Future work: Solder circuit together Change wafer mount…? Leave out Calcein…?
Questions?