Newsgroups: sci.image.processing
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From: k9ape@eecs.nwu.edu (Sheldon L. Epstein)
Subject: Re: VIDEO CAMERA WITH VARIABLE NO. OF FRAMES PER SECOND
Message-ID: <D59BDK.577@eecs.nwu.edu>
Sender: usenet@eecs.nwu.edu
Organization: EECS Department, Northwestern University
References: <3jm6oq$2gr@dingo.cc.uq.oz.au>
Date: Sat, 11 Mar 1995 03:36:55 GMT
Lines: 47

In article <3jm6oq$2gr@dingo.cc.uq.oz.au>,
mosavian <mosavian@s1.elec.uq.oz.au> wrote:
>Hi,
>I am working on continuoous centrifugals used for the separation of
>sugar crystals from molasses. To  freez the paticles' motion in the basket
>and get a proper image from the them, I need a SPECIFIC VIDEO CAMERA 
>WITH VARIABLE NO. OF FRAMES PER SECOND to be able to get one frame 
>per each  basket rotation.
>
>So far I have been told that the only way is to use the film, which will be very
>expensive. 
>
>All the suggestion will be appreciated.
>
>Please contact me by  the following email address:
>	mosavian@elec.uq.oz.au
>
>Thanks,
>Hamed

Hello Hamed,

First, the good news.  There are video cameras  which
offer 'DONPISHA' asynchronous shuttering,  Two that we sell are
the SONY XC-77RR B&W camera and the C-TEC TKIF-66 Image Freezer
with its companion M-892 RGB Color Camera.

Next, the bad news,  These cameras only operate in the DONPISHA
mode at shutter speeds of 1/2000 or less, are limited to one NTSC
or PAL field every 1/30 or 1/25 second and operate in the field
mode.

Unless the centrifuge is turning slowly, these cameras won't produce
sharp images.  My suggestion is to use these cameras at higher shutter
speeds and not try to get one frame per revolution.  One camera,
a PULNIX TM-9700, is capable of delivering full NTSC frames at
shutter speeds of 1/16,000; however, performance is noisy at that
speed - partly due to light source flicker.

Please keep us posted on your results as there are a few of us
out here who are also searching for solutions.

			Shel Epstein, k9ape@eecs.nwu.edu
			Chief Engineer
			Epstein Associates
			POB 400
			Wilmette, IL 60091-0400
