Date: Wed, 17 Mar 1999 10:52:06 -0700
From: "Dennis L. Paisley" <[EMAIL PROTECTED]>
There are quite a few CCD-type cameras available that could work. I
suggest that you check the SPIE web page www.optics.org , Laser Focus
Buyers Guide, www.laserfocus.com/, or Photonics Spectra buyers guide,
www.photonicsspectra.com/. If you still cannot find a camera of interest
ask again for specific companies.
By far your best light source is a pulsed laser such as a metal vapor laser
(copper vapor) that can be repetitively pulsed. Without a monochromatic
light source the contrast will be very poor. Use a pulsed laser and a
camera with a bandpass filter matched to the laser. This method will
permit viewing the metal surface while welding. Over 15 years ago, I
designed a system like this using a moving film framing camera to record
welding.
Without knowing all the parameters of the welding it is difficult to give
exact solutions to your problem, but using this basic experimental method
should work quite well.
Dennis
>From: FRANCO <[EMAIL PROTECTED]>
>Subject: high speed imaging
>
>One of the objectives of our group is to develop ways to control the
>automated welding. Nowadays, we're trying to develop a system to control
>the welding quality by observing and analyzing the metal transfer that
>occurs during the welding ("GMAW of steel").
>To do that, we must get images from the arc welding. Some researchers has
>been obtaining images from the arc welding using different equipment's.
>But, it is not easy getting high quality images due to the arc high
>intensity of illumination and also the high droplet transfer frequency. The
>Drop frequency changes between 1000 and 3000/sec, that's why we need a
>camera that is capable of getting images with a frequency of 1000
>frames/sec or even higher. At the beginning we thought about getting a high
>monochromatic camera. And considering the arc high intensity of
>illumination, we would like to use a camera with high shutter speed (~0.1 ms).
>What would be the best camera in your opinion? What kind of illumination
>would be the best? We'd appreciate a lot if you could give us your opinion
>about this matter.
>
>Thank you for your help.
>
>Franco Micaroni Neto
>Mechanical engineering
Dennis Paisley
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Los Alamos National Laboratory
P.O. Box 1663
Los Alamos, NM 87545
tel: 505-667-7837 (DX-1), MST-CMS, TA-3, 1761 Rm.101,tel:505-665-4003 (MST-CMS)
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