Date: Wed, 17 Mar 1999 13:54:47 -0500
From: Don Thomas <[EMAIL PROTECTED]>
The MotionScope system should work for the welding application that you
describe. The IR filter on the camera sensor cuts off at about 700nm so IR
should not be a factor. The key to acquiring a good image is sorting through
the issue of camera dynamic range (difference between image scene with and
without arc). It is a difficult application but I have found that providing
strong illumination to help offset the delta between the brilliance of the
arc and a black background, and a little experimentation with filters such
as the type used in welders goggles has provided images of the weld
droplets. I expect that the application can be dialed in with a little
experimentation.
A Redlake MotionScope camera system (as a stand alone device or the PCI
computer-based version) should be a good solution. I suggest that Franco
Micaroni Neto request that our local distributor demonstrate the product on
his application to see if the results are good for his research.
Regards,
Don
> -----Original Message-----
> 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
>
