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Registered Member #27
Joined: Fri Feb 03 2006, 02:20AM
Location: Hyperborea
Posts: 2058
I built a laser scanning microscope, you can get excellent results using scrap. I never completed it to a point where it could make digital pictures. I was watching the readout on an oscilloscope.
I have been thinking about making a USB device that connects as a mass storage device and the scan will appear as a picture file on the drive. it would be a most useful thing to have.
Registered Member #27
Joined: Fri Feb 03 2006, 02:20AM
Location: Hyperborea
Posts: 2058
I used the optics from a CD player and a high quality laser pointer to make 500 nm dot. I used speaker coils driven by 16 bit D/A converters to scan the sample under the dot and a photodiode to record the reflected light.
Registered Member #139
Joined: Sat Feb 11 2006, 11:01AM
Location: Perth, Western Australia
Posts: 358
this is what i am currently looking at,
(apologies for poorly formatted link, on dodgy pda.)
it's actually a tunneling microscope, I have also heard of people using electron guns from a telly to make an SEM (Scanning Electron Microscope) the only drawback I can see to the diy tunnelling 'scope is the prohibitive cost of the components, piezo's etc.
Registered Member #49
Joined: Thu Feb 09 2006, 04:05AM
Location: Bigass Pile of Penguins
Posts: 362
I was working on a simple atomic force microscope at one time, but gave it up because my sensors had far too much drift to be useful.
Regardless, one of the lessons I learned was that the piezo motion base is by far the easiest part. I think it was Ben who clued me in to a guy who did it by taking the quarter-sized piezo from a radioshack beeper and dividing the material into fourths. Then by energizing the quarters, he could cause the disk to flex a bit, and the sample stage deflected as well. Simple. Good. Cheap.
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Microscopy
