Date: Fri, 27 Nov 1998 10:50:19 -0600
From: "EPIX, Inc." <[EMAIL PROTECTED]>
Tom,
>Hello Chuck,
>Thank you for your interest and response. I have replayed below.
>
>>If you are interested in capturing image sequences from your system,
>>a camera is required that will run at as high a frame rate as you need.
>
>Actually, I had the idea that if I could have a high intensity stroboscope
>which could produce short multiple pulses, I could actually get motion
>phenomena on one frame/picture. So, two pulses would be enough to determine
>size, speed and direction, more than two stroboscope pulse would also give
>path information. The problem is I am not sure how to get the whole thing
>to work (if it will work).
To get multiple short pulses, you will need multiple strobe lamps.
You have to find a strobe that will meet your timing requirements.
The multiple image that you describe is exactly what the gated intensifiers
produce when triggered multiple times per camera image.
>>We have used various Dalsa cameras, the latest is a 256 by 256
>>Motion Vision camera that operates at 955 frames per second.
>>This camera requires some type of flashed light to stop motion.
>>We have used a LED ring lamp successfully, but we are dealing
>>with objects moving at 60 miles an hour. Sounds like your system
>>is much faster.
>>
>I do not actually need a consecutive sequence of images, since the
>phenomena occurring in my device occur repeatedly. It is not like videoing
>a car crash or books falling. However, if HS video is reasonably priced an
>imaging sequence would be nice to have for reporting and playback.
If you do not need the image sequence, but can do with multiple exposures
per image, then a gated intensifier or multiple strobes into a slower CCD
camera is less costly.
>Actually, if I have calculated correctly 60 mph = 30 m/s. My max. is
>slightly less than this.
>
>I have up to 24 "wings" on my rotor which turns at a max. of 50 Hz
>resulting in a freq. of 1200 Hz. If I were to capture a sequence of images,
>I would need at least that speed.
What resolution image do you need to capture?
One can trade image size for frequency of frame rate.
Chuck Petersen
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