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Old 12-09-2014, 01:28 PM #1
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Default Noob safety question

I've ordered these googles:

Portable Protection Goggles Laser Safety Glasses Green Blue With Velvet Box HC | eBay

..but I don't understand what this line means:

Attenuation: (10-6 < N% < 10-4).

I was hoping someone could help by explaining this.

OD5 and OD6 I think are powers of ten, so factor of 100,000-1,000,000 less light passes through the goggles over the wavelengths it's designed to attenuate?

I assume said goggles are useless at blocking any IR the laser emits, but at the powers of laser I own and lack of IR collimation I should be OK.



Last edited by tttonyyy; 12-23-2014 at 01:08 PM. Reason: More to the point
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Old 12-24-2014, 06:40 AM #2
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Default Re: Noob safety question

something tells me that tony does not like to do any homework==
for starters THIS is his first everpost --not what I call a nice introduction- but I digress.
this Greedbay seller has++
Negative 109 reps THIS last 30 days ALONE
and 311 negs for the last12 months
 
WHY would you send him any money?
 
Is THAT all you value your eyes at less than 2 PBS.
 
and they do NOT bolock ANY IR--

They look liked the kind that are sent free when buying a cheap China laser=only slightly better than nothing.

Higher OD means more protection BUT what wavelengths are they claiming??
I think they are for green and blue lasers... and even then you surely would never want to take a direct it to the eyes==IF you were extremely unlucky and the beam hit straight into your eye-- our own lens will magnify the power AS MUCH AS 100,000 TIMES.

PLEASE check this out before doing any lasing outdoor at night--


laserpointersafety.com

and when you can--do us the courtesy of an 'intro thread' on yourself in the WELCOME section.

Hak
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Old 12-24-2014, 09:38 PM #3
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Default Re: Noob safety question

He does have a few negs granted, but to put it into perspective he appears to shift about 6000 items a month and it's hard to keep everyone happy.

Are these glasses inadequate for 100mW blue/green? If they are OD5 for 190nm-540nm then 100mW reduces to 1uW which sounds pretty harmless. I guess they can be tested with the lasers themselves and a cheap camera, comparing the spot vs a 1mW red.

laserpointersafety.com details a nice way to check for IR using a CD as a diffraction grating, I quite like that
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Last edited by tttonyyy; 12-24-2014 at 09:39 PM. Reason: Typo, I blame my fingers.
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Old 12-25-2014, 12:05 AM #4
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Default Re: Noob safety question

no they will offer SOME protection- Many must buy cheap at first-then save up for better (like Eagles)and 'retire' the cheapies as 'guest goggles'

here is a super member to do biz with Kot-username Blord-- he is much closer to you and has an awesome rep here.. hardly anyone ever wants to sell their Blord laser--


back to eye safety

IF you can avoid with glasses or just EXTRA care these thre times=you should be fine
WEAR eye protecrion
when
measuring the beams
metering the power
and taking pics
THOSE are times when MOST accidental injuries occur.

We had a member get serious retina damage when his laser hit his car mirror while trying to take a pic at night while sitting in his car..
also if the laser hits the center of you eye it will be MANY times stronger just like the sun and a mag glass-- but quicker!!!
anyhoo
you have already paid -too many come here asking that instead of saking where to shop==

+6 for adding your home town

CHEERZ mate!!
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Old 12-29-2014, 05:03 AM #5
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Default Re: Noob safety question

bump update with info..

The OD (optical density) of LSE (Laser Safety Eyeware)
The Math
Wavelength specific
Defined as the ability to reduce laser energy being used.
Goal is to reduce below MPE. (Max Exposure )
formula: OD = log 10(EI/Et)
where EI = incidemt beam irradiance (equals power as W/cm2) or mW/cm2)
and Et= transmitted beam irradiance (MPE limit in W/cm2)

This is the MPE of the laser radiation that will be allowed to pass thru safely.
EXAMPLE.. OD of 4.0 allows 1/10,000 ofthe laser slight energy to be trasnsmitted.

On the frames of the LSE you should see something like this 400-560nm ---OD 4.0

so that would cover blue and green lasers but NOT red or IR. IF there is NOTHING on the frames they are junk..
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Old 12-29-2014, 03:04 PM #6
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Default Re: Noob safety question

These glasses claim OD5+ for 190nm-540nm but there is nothing obvious written on the frame.

To be honest I'm increasingly coming around to your advice that it's silly little money to spend on eye safety, and properly certified protection would be a very wise investment.
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Old 12-29-2014, 10:12 PM #7
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Talking Re: Noob safety question

Quote:
Originally Posted by tttonyyy View Post
These glasses claim OD5+ for 190nm-540nm but there is nothing obvious written on the frame.

To be honest I'm increasingly coming around to your advice that it's silly little money to spend on eye safety, and properly certified protection would be a very wise investment.
Welcome A Board!



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Old 12-29-2014, 11:08 PM #8
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Default Re: Noob safety question

Hmm, looks like he chose the wrong wavelengths to protect against pipe bomb blasts
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Old 12-30-2014, 12:23 AM #9
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Talking Re: Noob safety question

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Hmm, looks like he chose the wrong wavelengths to protect against pipe bomb blasts
It was that Heisenberg uncertainty that got him.

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Old 12-30-2014, 01:44 AM #10
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Default Re: Noob safety question

Quote:
Originally Posted by Teej View Post
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Looks like he was playing with the Navy's new laser!
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Old 12-30-2014, 11:41 AM #11
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Talking Re: Noob safety question

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Looks like he was playing with the Navy's new laser!
Just a pipe dream now.

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Old 12-31-2014, 02:56 PM #12
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Default Re: Noob safety question

Well I did some testing with the goggles above.

~100mW 630nm red goes straight through, no surprises there.

~100mW 532nm shone through the goggles does not produce a green spot on white paper held the other side - at least in the visible spectrum. IR goes through at a slightly defracted angle and does not appear to be attenuated at all).

~100mW 405nm produces a much reduced strength dot on white paper held the other side. This is less intense than a 0.5mW red spot.

When worn 532nm and 405nm beams are hidden but beam spots on light materials are visible as a dim point of light.

So these goggles are probably OK for low powered 532/405nm so long as no significant IR component is present. If there is IR, you could easily stare into the beam of IR without being any the wiser that it's there.
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445nm 1W pointer and 3W+ Nichia NDB7875 with G9 Lens
532nm 5mW, 100mW x2, "True 300mw Output" (from China, actually about 80mW)
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Old 01-03-2015, 07:48 PM #13
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Default Re: Noob safety question

This is copypsta from a thread at the show forum...

Laws/regs etc DO vary from state to state... and most agree that Arizona is the 'worst'

NY and Tx as also more strict or want more $$--here we are supposed to get a two year permit for EACH projector at $400 EACH!!

back to eye wear--
Karl does shows for a living and here is what happened to him involving eyewear--

Originally Posted by hakzaw1

karl 'laserwiz' got into a bad deal in Arizona over eye ware- So IMO--for all on show crew at least have them on you--




from Karl--
LOL... yeah thats putting it lightly...


Yep, that $1200 rave gig resulted in a $2000 violation letter from them and almost not being allowed to do the second day of a gig I had already been paid in full for!

Word to the wise- AZ Radiation not only expects you to have safety eyewear, but they expect to also have some form of documentation that they have been tested to ensure that they perform properly ( i think every 6 months, I'll have to check what their current requirement is)...

And if thats not bad enough, depending on who they would send out to do the light show inspection, sometimes the laser operator would have the additional pleasure of having to argue/ explain/ justify why they were not wearing their laser safety eyewear while adjusting the size of a test pattern on the wall...... yeah you read that right... "shakes head"

That was what prompted AZ's inspector to look at my safety eyewear, which I almost didnt even bring with me that day-

The actual fineable violation I got that day was relating to the fact that the O.D. that was printed on the safety glasses was worn off and therefore unreadable from rubbing on the inside of its protective case for several years in a road case drawer.. The real issue was that I didnt actually need to even have them with me, based on the actual wording of the law and the fact that there was no "service or maintenance procedures being performed". They never did change the wording of the law, so I wouldn't advise fighting them on that issue. The next person may not get out of the fine.....

That being said, a pair of these low O.D. glasses will allow you to shut up an inspector AND still see what you are doing at reasonably safe alignment power levels: http://www.kenteklaserstore.com/kxl-...alignment.aspx

(((((( ^^ not a fun weekend for Karl for sure--

You may be asking what does this have to do with pointers???

The rules/laws/regs etc do NOT say 'except handhelds' there is no 'loophole' for pointers- they are covered afaik the same as a projector.

btw if you don't care to look at Karl's eyewear link I will tell you that those are $325 EACH .

............. ouch!!

btw this : 'reasonably safe alignment power levels'
refers to the way a LSO does this-- the 'house lights' are on at FULL brightness (which lessens to size of your iris-letting LESS light in) AND the projectors are 'dialed' down to the lowest possible output to do the 'work' --less mW = less danger .....BUT you are STILL expected to wear LSEs.
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Last edited by hakzaw1; 01-03-2015 at 07:54 PM.
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