Re: [CAD_CAM_EDM_DRO] Re: 3D Scanner/ Dizitizer

Graham
You can take a look to a zip file
I had upload it in the master5 yahoo group.
-laser probe project-
This is a test which is working as you describe
(wihout a filter,but..).
I am also coupling a basic piezo sensor (touch probe option)
instead of the laser,and I am trying to separate noise to
get a clean probing,because the device is very
very sensitive , in progress.... the last test was ok but
with more bad spikes (less than 1%) than the laser <0.001%.
hope this help.
thierry


-----Message d'origine-----
De : Graham Stabler <eexgs@...>
À : CAD_CAM_EDM_DRO@yahoogroups.com <CAD_CAM_EDM_DRO@yahoogroups.com>
Date : dimanche 18 avril 2004 19:29
Objet : [CAD_CAM_EDM_DRO] Re: 3D Scanner/ Dizitizer

>You could make something similar yourself although it would not be
>overly simple. If a decent lens or microscope objective is used to
>focus a laser beam to a point and then this point is imaged to a
>camera or photodiode then the maximum brightness is found when the
>beam is focussing onto the surface beneath, i.e. when the surface is
>at the lens focal length from the lens. You scan in Z to find this
>maximum and record the height, move over and repeat. There are
>probably other more complex ways of doing it using image correlation
>for example, I don't know just thing off the top of my head. A
>filter to remove the ambient light would also be helpful. It also
>won't work well on steep slopes.
>
>Graham
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