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Q: timing / triggering device needed ( No Answer,   2 Comments )
Subject: timing / triggering device needed
Category: Science > Instruments and Methods
Asked by: merigomish-ga
List Price: $25.00
Posted: 18 Mar 2006 16:34 PST
Expires: 17 Apr 2006 17:34 PDT
Question ID: 708930
hi there, i need an 'off the shelf'  device which can trigger up to 6
or 8 solenoids
with .01 second accuracy. the application is the timing of pneumatic
and mechanical actuators for a high speed video shot. since we'll be
shooting at 1200 frames per second 1 sec will be 40 seconds on screen,
hence the need for .01 sec accuracy.  devices to be triggered are low
power 110ac solenoids.
There is no answer at this time.

Subject: Re: timing / triggering device needed
From: thebestprofessor-ga on 20 Mar 2006 16:50 PST
Important question do you want to swich them independent from each
other or dependent.? An " off the shelf solution" is to buy an
interface for your computer and swich with the software that comes
with it. Under $100, your problem is solved. Please mail me for
further details.
Prof. Kees
Subject: Re: timing / triggering device needed
From: larryg999-ga on 22 Mar 2006 13:04 PST
1.  ?1200 frames/second? translates to .0008 seconds per frame, hence
the required accuracy would appear to be .0008 seconds or better.

2.  These solenoids are described as ?low power 110vac?.  Residential
power in the U.S. is a 60 Hz sinewave whose instantaneous amplitude
varies over e.g. a 10:1 range during each 10-frame interval (at 1200
frames/sec).  The solenoids would need to be powered (via trigger
switches) from a DC supply.

3.  Ideally, each of the 8 solenoids would be triggered independently,
so that each timing signal could be ?trimmed? independently +- a few
milliseconds, to compensate for solenoid-to-solenoid variability, to
achieve exact simultaneity.

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