Hello,

I have a cylinder (drum of a copying machine) and on the outer surface of the
cylinder there are some sort of tracks on it. These tracks are of copper and
the width of one track is in micrometres.
There are approximately 7000 tracks on the cylinder.

Now what's my problem : I need to check these copper tracks, the copper
tracks may not have a break or if there is a scratch on the surface this has
to be notified.
To check this I wanted to use a camera with a lensing system and a computer
with Turbo pascal or Delphi.

My question is what kind of PC-card I can use and if there are procedures
in Turbo Pascal or Delphi to make a scan of the surface?

Thanks so far for reading.

What optical resolution do you need or want 1um?

What the height of the cylinder?

I would not use a camera with a CCD matrix. Try a CCD array or a diode array.
Hamamatsu Corp. has nice diode arrays with e.g. 1024 diodes and 25 um pitch.
So you can cover a length of 25 mm. You can add a few arrays to a linear sensor
with 100 mm e.g., but roughly each diode cost about 1 $. When you rotate the
cylinder and readout the diodes (16 bit resolution is possible!!!) you can
easily
detect any defects. However you need some opticle lenses (if necessary you can
magnify to 1um and some illumination which should be very stable and for
short readout cycles quite bright. Power Infrared LED's are quite goot for this.

Delphi is very nice and easy but maybe a little to slow in comparison to a DOS
based program

All you need inside your PC is a high speed AD-Converter. 12 or 16 Bit
resolution
100 KHz cost about 600$. Card can operate with DMA and some source code with
examples is shipped with the card. For full operation I would recommend:
- preamplifier (~400 $)
- trigger signal converter and voltage stabilizer (~400$)
- diode array(s) n * 1000 $
- lenses (~100 $)
- power IR-LED (~50 $)
- 1 steppermotor for cylinder rotation (50$)
- 1 steppermotor with X-Axis (for linear movement of sensor or cylinder),
   what will be easier? I guess to move sensor. (~500 $)
- steppermotor controller for 2 motors (~1500$)

with this and some software you can make an automated cylinder surface scanning
tool.
I use a very similar system for filmthickness measurement on round substrates as
CD's or
on squared one like flat panel substrates. I wrote the software to link all
components, to
evaluate and display the results. That was the hard way. There was no similar
system on
market and I sell now this stuff.
You can (or should) go the easy way, because I know there a many image
processing
solutions available.
If you are interested in more details on my way, let me know!

I did it!

Greetings

Armin Kuebelbeck

In article <55g9kk$...@turtle.stack.urc.tue.nl>
           richa...@stack.urc.tue.nl "Richard Niessen" writes:

[snip]

By PC-Card do you mean an expansion card for a desktop/tower PC
or a PCMCIA type card.

In either case, you would probably do best looking for a specialised
one relating to image analysis

--
News Reader Silverstone