Laserscope Modification Just Finished!

[Banthai]

Originally Posted by mixedgas For the sake of his eyeballs, a brick is NOT enough termination. The scattering will still cause retinal burns, thats why it is CLASS FOUR.

Steve
Phredy1 said

If you hit him in the head hard enough with the brick it will be enough termination.

this thread is becoming class entertainment ...

i now look forward to reading this every day

I hope there i no limit on how many posts per thread ..... cos this has some milage left in it yet

all the best ... Karl

[Diachi]

Most of the threads on LPF can't even reach this level of entertainment.

[prodjallen]

You guys wanna see stupid an unsafe?, Doesn't matter that its not in the USA, either, the Russia incident wasn't in the USA either, when it comes to safety doesn't matter where your located... Look at this video, they have Q-Switched lasers in the audience, and you can tell its pulsed from the dots its creating when its doing a fan effect...

http://www.youtube.com/watch?v=rv2wXmHLc2M

-Allen

[Stoney3K]

You guys wanna see stupid an unsafe?, Doesn't matter that its not in the USA, either, the Russia incident wasn't in the USA either, when it comes to safety doesn't matter where your located... Look at this video, they have Q-Switched lasers in the audience, and you can tell its pulsed from the dots its creating when its doing a fan effect...

http://www.youtube.com/watch?v=rv2wXmHLc2M

-Allen

That show was done by one of the most renowned Dutch laser show companies, and they definitely haven't used Q-switch in an audience. Ever. There are people from that company on the PL boards, they may be able to comment on that, but I'm 99.9999% sure that that's done with DPSS.

The dotting you see is from fast blanking and scanning combined with a crappy phone cam refresh rate, or just an intentional pattern of fanning beams!

For the sake of his eyeballs, a brick is NOT enough termination. The scattering will still cause retinal burns, thats why it is CLASS FOUR.

At what power levels does scattering become dangerous, aside from specular reflection? Does that also depend on the terminating surface (e.g. a white piece of paper versus black Gaffer tape)? My guts tell me that crowd-scanning with anything class IV is no-go, since the scattering can be dangerous to the audience as well.

[mixedgas]

At what power levels does scattering become dangerous, aside from specular reflection? Does that also depend on the terminating surface (e.g. a white piece of paper versus black Gaffer tape)? My guts tell me that crowd-scanning with anything class IV is no-go, since the scattering can be dangerous to the audience as well.[/QUOTE]

500 mw is the line on from class IIIB to Class IV in the US. Things can get dicey below that if the scatter is close to the eye. Lucky for us, inverse square law comes into play with most solid scatterers. You can have both instant damage and long term exposure math, too.

It of course depends on power level and scattering material , but the rule is roughly 300 uWatts cm^2 for a 8 hour exposure day.

There is a chart for power entering the eye vs wavelength vs time, vs pulse duration vs cw. One of those things you have to measure instead of just a guideline.

It can be found at some page in this pdf here, as well as other places.

http://www.army.mil/usapa/med/DR_pub...f/tbmed524.pdf

Most nations have adapted a similar chart.

Steve

[aijii]

They use OPSL, and they are just scanned/blanked/hotspotted effects.

That show was done by one of the most renowned Dutch laser show companies, and they definitely haven't used Q-switch in an audience. Ever. There are people from that company on the PL boards, they may be able to comment on that, but I'm 99.9999% sure that that's done with DPSS.

The dotting you see is from fast blanking and scanning combined with a crappy phone cam refresh rate, or just an intentional pattern of fanning beams!



At what power levels does scattering become dangerous, aside from specular reflection? Does that also depend on the terminating surface (e.g. a white piece of paper versus black Gaffer tape)? My guts tell me that crowd-scanning with anything class IV is no-go, since the scattering can be dangerous to the audience as well.

[Phredy1]

You guys wanna see stupid an unsafe?, Doesn't matter that its not in the USA, either, the Russia incident wasn't in the USA either, when it comes to safety doesn't matter where your located... Look at this video, they have Q-Switched lasers in the audience, and you can tell its pulsed from the dots its creating when its doing a fan effect...

http://www.youtube.com/watch?v=rv2wXmHLc2M

-Allen

Again your arrogant attitude. You assumed you knew what you were talking about, when you didn't know shit.

Rather than ask about something, you talk like you know it all. Rather than ask if those might be dangerous lasers, you say they have. People here know what they have, and they were not Q-Switched lasers.

My advice: Be concerned about what Allen does right, and not what the rest of the world does wrong. Life will be much easier.

-Gene

[mixedgas]

At what power levels does scattering become dangerous, aside from specular reflection? Does that also depend on the terminating surface (e.g. a white piece of paper versus black Gaffer tape)? My guts tell me that crowd-scanning with anything class IV is no-go, since the scattering can be dangerous to the audience as well.

500 mw is the line on from class IIIB to Class IV in the US. Things can get dicey below that if the scatter is close to the eye. Lucky for us, inverse square law comes into play with most solid scatterers. You can have both instant damage and long term exposure math, too.

It of course depends on power level and scattering material , but the rule is roughly 300 uWatts cm^2 for a 8 hour exposure day per osha.

There is a chart for power entering the eye vs wavelength vs time, vs pulse duration vs cw. One of those things you have to measure instead of just a guideline.

It can be found at some page in this pdf here, as well as other places.

http://www.army.mil/usapa/med/DR_pub...f/tbmed524.pdf

Most nations have adapted a similar chart.

Steve[/QUOTE]

[prodjallen]

Looking at the scatter from the beams in the air on the right side, it looked like a q-switched laser because usually from a cw laser you cant get that bright of scatter (time: 1:27), unless there was some type of particles raining down from the stage or something in the beams, and then those dots looked like a "solid line" you would see from a pulsed laser when it hit the white cloth that goes top to bottom on the right side, because the dots are much brighter then the actual "line" itself, I guess I was wrong...

Thanks for that document steve, I like the detail...

-Allen

[prodjallen]

Btw, I'm going through my shop of electronics, if there is something specific anyone needs, this goes to the non-assholes , please let me know I have tons of stuff that im probably going to end up trashing, if your not local just pay for shipping on the small items, working junk ranging from transisters, caps, li-ion batteries, stepper motors, power supplies, computer PSU's (I have prob a good 20-30 of them ranging from 200w to 800w), heatsinks, project boxes, about 4 round key-switches (key locks in "on" position), 2 hene tubes from laserscopes 25mw (powersupply for it exploded like crazy for no apparent reason), and various other junks...

And I also wanted to ask about this: http://www.ace4parts.com/Products/Ke..._30-10076.aspx

Can I use a round key like that, that doesn't come out in "on" position only "off" for CDRH / FDA (product report) for my laserscope? because anyone can just jam a flat screwdriver in most normal keyswitches to turn them on, I also want to put one on the Q-Switch's power... What do you guys think?