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Registered Member #846
Joined: Tue Jun 19 2007, 08:04PM
Location:
Posts: 40
Using a power supply and cap to manually fire a flash tube is straight forward (even though it took for ever for me to get to this point). ;) How is firing of a tube done at a high rate or just to pick a number, twice a second? Is it a different power supply capacitor combination tailored for rapid pulses all together? Using my 1.3kV poser supply it takes a and 1000v UL30 capacitor it takes somewhere around 4 to 8 seconds on average to charge the cap. Is the pulse width shortened enough to allow a threshold to be reached but not completely drain the cap? From my perspective currently it looks these two type of operating a mutually exclusive. Is my logic flawed??
Registered Member #56
Joined: Thu Feb 09 2006, 05:02AM
Location: Southern Califorina, USA
Posts: 2445
A flash tube will drain the cap completely, so if you want to increase the pulse rate you just need to get a more powerful supply. But keep in mind that the tube of a ssy-1 laser will only take about 10w of average power.
You could, in theory, use a big IGBT to disconnect the tube from the cap mid-pulse, but I can pretty much assure you that it won't be worth the effort.
Registered Member #30
Joined: Fri Feb 03 2006, 10:52AM
Location: Glasgow, Scotland
Posts: 6706
Most modern photo flashes do indeed use that big IGBT for exposure control. Big is a relative term, it comes in a SMT package for integration into small digicams and the like.
Registered Member #621
Joined: Sun Apr 01 2007, 12:37AM
Location:
Posts: 119
Will, when I went to Anderson Laser's for a visit, Dick Anderson showed me a Scientific Research Frequency Doubled YAG laser, it was about 36" long by 8 inches high by 18" wide and had two power supply towers that were taller than me and had 3 phase 480 volt power. It was water cooled too. This laser was fun, it ran at about 4 hertz, so we could draw paper by it and blow holes in it, and burn a name into a brick when he adjusted the q-switch. It has mechanical servos so that he could punch in the remote control and move all the optical parts. God I wish I had $30,000 plus for a fun laser LOL!!! YEAH RIGHT!!!!! But either way, the rod was only about 5 inches long, and the flahlamp was a helical maybe the same length.....so man oh man does it take alot of power to rapidly fire!! I just recently talked to him and he said it has a few big Maxwell caps.....and to charge and discharge those 4 times a second wow..... And I know there's much bigger/more powerful out there. It ran so efficient though, you'd never picture all that power it just effortlessly clicked away like a disco strobe!
All you heard was the water pumps and cooling fans and tick tick tick tick tick, then when we put a lense infront of it the clicks turned to SNAP SNAP SNAP!!! as blinding balls of green plasma formed and I could smell the ozone! (I dropped the glasses for a second or two and it looked like I was staring at a camera flash (but green)where the beam hit!! Lasers are some beautiful stuff!
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Pulsing a flash lamp
