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Old 10-05-2011, 04:08 PM #1
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Default Homemade Safety Glasses (Violet, Blue & Green)) Don't SAFE yet

This is my first post of that kind, so I apologize in advance for the translation and any errors that I made...
A month ago I ordered some goggles to dino, but have not yet arrived, and since I can not still have the laser, I decided to make me some goggles with what I had on hand: cellophane paper, construction safety goggles, laser with different powers and wavelengths


celophane pages:


celophane color 1:


celophane color 2:


celophane color 3:


celophane color 4:


All celofan pages put together:


seen through the goggles:


The finished goggles:


Let's go with the test:

Test with green laser (532nm-200mW):


Test with violet laser (405nm-200mW):


Test with blue laser (445nm-1W):


All the stuff and laser detail:



I would like to know your opinion about what you think and if you think that has real value, I've used the few moments and seems to work well ...

Saludos a todos & Thank you very much!!!

P.D.(I am resizing the images of the types of celofan i've used)



Last edited by ic32k; 10-10-2011 at 07:08 PM.
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Old 10-07-2011, 09:10 PM #2
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Default Re: Homemade Safety Glasses (Violet, Blue & Green))

It looks all dark to me.

I mean, I can't see any images.
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Old 10-07-2011, 10:49 PM #3
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Default Re: Homemade Safety Glasses (Violet, Blue & Green))

i'm using my mobile, bad quality, sorry, i'll make better photos and edit the post...

In all the test i'm pointing to the cardboard directly though the glasses.

You think that the glasses can work properly?

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Old 10-08-2011, 08:30 AM #4
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Default Re: Homemade Safety Glasses (Violet, Blue & Green))

I think it's a VERY bad idea to use this as safety glasses. Even the $7 chinese stuff works better, and even those can't be trusted at all times.

I recommend getting laser safety glasses that are known to work or, even better, properly certified. You only have one set of eyes and damage is permanent, don't skip on safety.
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Old 10-08-2011, 08:44 AM #5
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Default Re: Homemade Safety Glasses (Violet, Blue & Green))

ye man these definetley could not be safe , the laser might burn through the cellophane paper?
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Old 10-08-2011, 01:22 PM #6
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Default Re: Homemade Safety Glasses (Violet, Blue & Green))

Not, the laser can't burn through the glasses, so I thought I could be safe!
anyway i'm awaiting a pair of googles of focalprice (the oranges (190-540nm) and blue (650nm) ones , can the blue protect against 660nm???)
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Old 10-08-2011, 02:10 PM #7
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Default Re: Homemade Safety Glasses (Violet, Blue & Green))

Even though it may block a similar amount of light, it is all concentrated in a thin layer, and likely to fail much sooner than thicker plastic.
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Old 10-08-2011, 05:55 PM #8
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Default Re: Homemade Safety Glasses (Violet, Blue & Green))

no... I have tried shining a 200mW red through sheet of color filter (blue), and it burned it in an instant ... don't rely on these to protect you!!!

it may serve as to look the dot through them but ... ah meh don't use them.

also I need a bigger monitor that first picture is sooooo BIG
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Old 10-08-2011, 06:51 PM #9
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Default Re: Homemade Safety Glasses (Violet, Blue & Green))

Changed the resolution of the photos, and showing all the colors...

I supose that it will be better than nothing... But I'll have to wait until the goggles come home whitout using the laser...

OK! Thank's guys, i'll discard the goggles. But i will compare to the purchased ones...
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Old 10-09-2011, 04:21 AM #10
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Default Re: Homemade Safety Glasses (Violet, Blue & Green))

If they do block the light it'd be better to use them rather than just look at the dot with your bare eye i'd think (pointed at a wall not into you're eye).
I wouldn't use them at all if you had anything reflective even in the same room as the laser you're using though until you got the proper goggles.
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Old 10-09-2011, 12:24 PM #11
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Default Re: Homemade Safety Glasses (Violet, Blue & Green))

I'd only used twice, for 20 seconds at maximum and never pointing directly to my eyes (too much fool) but the results are that when i don't use them my eyes and my head get hurt, even for shorter periods of time.
And the lasers can't burn through the goggles, but i measured the protection layer and it has only 0,253mm (i used a micrometer) against the 2,135mm that have the transparent ones (i still don't know how much has the purchased i'll know in a pair of days i hope). It's evident that the protection of this homemade googles may not be much but not nothing, and to make better ones i'll need other kind of materials....

Does anybody measured the power of a laser (with LPM) through goggles?? how much power is left in them???
Edit: One more cuestion: the protective glasses tipically named "Anti Green Laser (190-540nm)" will protect against blue ang violet ones too?

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Old 10-09-2011, 01:55 PM #12
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Default Re: Homemade Safety Glasses (Violet, Blue & Green))

OD (Optical Density ) on the left, rough calculation of percentage transmission on the right.

1 0.1
2 0.01
3 0.001
4 0.0001
5 0.00001
6 0.000001

A larger OD, is clearly, better protection.

Here is the rub, most people who would make home made safety goggles do not have the 4000$ worth of sensitive silicon based optical power meters to test them. They do not have pulsed lasers to test to see if the dye used to block the light in a plastic bleaches under high power. It is possible for a dye to bleach and then a few microseconds later, look like a dark dye again.

A goggle must not just test against a indirect beam, it must withstand a direct hit, and also a focused beam.

The issue is one of a slippery slope. If LPF lets every person who posts about using theatrical gels, welding goggles, or other dyed plastics, as "My Great DYI Goggles that save Money" get away with it unchallenged, eventually some one WILL get hurt.

See, Goggles are intended by the Laser Safety industry to be a second line of defense. Your not supposed to depend on them, but instead use best practices to avoid being exposed in the first place.

I know for a fact of one person who assumed a low cost pair of goggles would be enough for her. After all, no one would publish a bad design on the internet... Right? No one would sell a unsafe pair of goggles on the internet for 35$ right? The Lawyers would eat them alive if there was a mistake, Right? So she started to buy a low cost goggle clone for use with a 100 watt average power Q switched pulsed YAG laser. She asked the vendor, a Asian outfit, if they were useful for 1064 nm. The vendor replied yes, our goggles are most fine for ANY laser. Care to guess how effective they were at 1064 nm? They were never tested at that wavelength, anyways. The unethical vendor wanted a sale, 35$ vs 400$ for a good pair for that situation. What is a eye worth?

If you do not know what 100 watt Average power at 1064 nM is.
For a beginner, that translates to "Big invisible IR laser that BLOWS holes in steel car doors, FAST". Even the scatter off the beam in dirty air can be a hazard with those. It was caught in time. I caught it.

Because of the high level of trust placed on Goggles, inferior or untested designs must DIE. They must be rejected by this community. There is a reason why there is a certification process for goggles.

It is not that you have done anything wrong by posting this, it is simply the fact that you have not been exposed to enough education and physics to understand why your design could fail at some level. Nor do you have the test equipment to test.

I did the same thing back in 1988, when I was a kid, and a safety expert saw what I was using and did some explaining.

A harsh way to look at things, yes, but experience has proven that this is the way it has to be.

Is some protection better then nothing, maybe. But today, the average beginner laser is 50 to 100 mW, or more and that is nothing to sneeze at.
Eye surgeons use around 300 mW of power for many treatments. Granted, their tools focus that power to a very small spot on the back of the eye, but it should wake you up as to why you should not trust home made Goggles.

Generally, OD3 are the minimum goggles used for partial protection against non-pulsed visible lasers of up to say a half a watt, under controlled conditions, while avoiding indirect viewing of the beam. Ie, alignment issues during a experiment. Anything else requires a careful analysis of what Goggle to choose, that is beyond the scope of this post.



MODS, STICKY PLEASE. I'm getting tired of retyping this five times a year!

Steve

Last edited by LSRFAQ; 10-09-2011 at 02:10 PM.
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Old 10-09-2011, 02:10 PM #13
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Default Re: Homemade Safety Glasses (Violet, Blue & Green))

I'm sorry if I offended anyone, and I ask the moderators if this is the case that deleted the post and forget everything.

This was a small project of mine and was only asking for help and advice, but if one is not professional should stay away from communities and risk going blind for not asking for advice ...
But as I had understood the only way to learn is to experiment and ask people who know how to do it, of course I know what I did not have any comparison with professionals and cerficate glasses...
Thank you for your words Steve, I will try to stay away, quietly and not bother anyone anymore ...
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Old 10-09-2011, 06:02 PM #14
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Default Re: Homemade Safety Glasses (Violet, Blue & Green))

WOA....

I dashed off to church and did not have time to finish writing...

This, is a cultural difference in language.

See that paragraph about... NOT YOUR FAULT, YOU DID NOT KNOW....

Hang around and lets discuss this, your not in ANY trouble. No one is banning you, no one has neg repped you, and no one has called you a jerk or worse. That, around here, means your doing fine.

Everybody said "your wrong", just nobody expanded on WHY. I started to expand one Why, and did not get finished, Mea Culpa. (Google it, its Latin)

You did not knowingly place anyone in danger, Google "MENS REA" (Legal Term) and see if you have that in your psyche. I don't think you do.

I think you should stay around and help me edit the "Sticky" for this.

Help me make it understandable from the point of some one who wants to make their own goggles.

The last young person who did this made a somewhat "Viral" youtube video, portrayed himself as a professional, and his Ego refused to let him retract it. You, on the other hand, just posted some results, got spooked by the response, and asked "Why?". That is a big difference, in attitude. Your attitude is the correct one! Welcome to science. You get critiqued, and sometimes harshly. Welcome to Ethics, which you clearly have!

You started to follow the approved method, by apologizing. Which you did in a very strong manner. A good thing.

Asking "Why?" is good. HANG AROUND!

Steve

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Old 10-09-2011, 06:33 PM #15
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Default Re: Homemade Safety Glasses (Violet, Blue & Green))

For better and "reasonably" safe protection DIY goggles I suggest to use photographic filters against appropriate wavelength (for example against 532nm laser a 25A filter). You can not be sure about the degree of OD but it is always better than these!
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Old 10-10-2011, 05:39 AM #16
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Default Re: Homemade Safety Glasses (Violet, Blue & Green))

Quote:
Originally Posted by Arayan View Post
For better and "reasonably" safe protection DIY goggles I suggest to use photographic filters against appropriate wavelength (for example against 532nm laser a 25A filter). You can not be sure about the degree of OD but it is always better than these!
I think what Steve is saying is these methods may work to a point, but you should try not to bring the ideas of making your own laser eye protection if there's no way you can be 100% sure it's safe to the masses, as it's inevitable someone not knowing what they're doing will try and get blinded.
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