RE: ATM Looking for CCD-Shutters

[Andy Saulietis <iss@pvtnetworks.net>]

Peter W writes,

>Just out of curiosity, has anyone ever tried using an LCD shutter? Perhaps
>in combination with a mechanical shutter. The LCD remains 'closed' until the
>mechanical shutter is open negating vibration effects, then it 'closes'
>prior to the mechnical shutter closing.

We built several large (~8 x 10") liquid crytal shutters back in
the 80's for NASA, for a satellite tracking experiment. The shutters
don't actually become opaque, just scatter light. This has the effect
of working like a shutter if the field is mostly black, but all of the light
is diffused over the inside of the camera. When 'clear', the shutters still
scatter
some light & thus may add some background when in the open state.

It worked for our case, where we were interrupting the trailed image of
a moving object like a satellite. The 'open/close' times were about 10ms 
IIRC.

 
Andy Saulietis
ISS Enterprises
39 Silver Fox Trail
Mayhill NM 88339
505-687-3067 voice
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e-mail: iss@pvtnetworks.net