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Old 07-25-2014, 10:21 PM #1
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Default Does shining laser at protective glasses damage them?

Hello,

I bought these glasses:
Laser Protection Goggles Safety Glasses for 808nm 830nm 850nm IR Infrared Laser | eBay

To protect my eyes from a 5W IR (808nm) laser diode.

Am I allowed to shine a dot through the glasses, to check (with a camera) if it gets filtered out?
Or will doing this, damage the glasses?

And a second question, do you think these glasses are legit? Will they actually protect my eyes?

Kind regards,


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Old 07-25-2014, 11:22 PM #2
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Default Re: Does shining laser at protective glasses damage them?

Quote:
Originally Posted by FalloutBe View Post
Hello,

I bought these glasses:
Laser Protection Goggles Safety Glasses for 808nm 830nm 850nm IR Infrared Laser | eBay

To protect my eyes from a 5W IR (808nm) laser diode.

Am I allowed to shine a dot through the glasses, to check (with a camera) if it gets filtered out?
Or will doing this, damage the glasses?

And a second question, do you think these glasses are legit? Will they actually protect my eyes?

Kind regards,
I don't know how good those glasses are. Looking at the picture and price I would expect them to be OK but there's no way to know unless someone has tested them. 5W is a bit much to be testing them with, I wouldn't be surprised if they are good to 10W but I also wouldn't be surprised if 5W would leave a burn mark on the glasses. Not much help I guess but that's all I can say.

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Old 07-26-2014, 03:01 AM #3
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Default Re: Does shining laser at protective glasses damage them?

Or keep the goggles moving around so you don't end up with a burn mark, unless the goggle is really not even in absorption there should be no difference
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Old 07-26-2014, 07:04 AM #4
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Default Re: Does shining laser at protective glasses damage them?

Good idea
Ok, I'll just have to wait until they arrive then, and do a quick test
Thanks for the replies!
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Old 07-26-2014, 08:33 AM #5
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Default Re: Does shining laser at protective glasses damage them?

what will be protecting your eyes while the glasses are in your hand or wherever while doing the test?
or are you going to be looking at a camera screen etc. while testing
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Old 07-26-2014, 08:49 AM #6
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Default Re: Does shining laser at protective glasses damage them?

Good point there didn't think about that yet.
That will be the only moment when I won't be wearing the glasses.
I'll have to think alot about the test setup for the glasses, because I can't risk any light reflecting off the surface of the glasses, into my eyes..

This is a 5W IR laser. I know this is not just 'serious', but SERIOUS. Apart from the moment when I'm testing the glasses, I'll always be wearing them when the laser is operative.

And for the testing part, yes I'll be looking at the camera screen from a safe position.
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Old 07-26-2014, 09:33 AM #7
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Default Re: Does shining laser at protective glasses damage them?

Quote:
Originally Posted by FalloutBe View Post
Good point there didn't think about that yet.
That will be the only moment when I won't be wearing the glasses.
I'll have to think alot about the test setup for the glasses, because I can't risk any light reflecting off the surface of the glasses, into my eyes..

This is a 5W IR laser. I know this is not just 'serious', but SERIOUS. Apart from the moment when I'm testing the glasses, I'll always be wearing them when the laser is operative.

And for the testing part, yes I'll be looking at the camera screen from a safe position.
you said something about using a camera in OP so maybe you could get a 2ft squared cardboard shroud and put a hole for the camera then just rely on the camera screen for whats going on
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Old 07-26-2014, 09:35 AM #8
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Default Re: Does shining laser at protective glasses damage them?

Good idea yes, I was also thinking about something like that
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Old 07-26-2014, 09:56 AM #9
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Default Re: Does shining laser at protective glasses damage them?

The cardboard shroud sounds like a good idea as long as you don't accidentally set it on fire, there's always something that can go wrong.

Alan
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Old 07-26-2014, 10:24 AM #10
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Default Re: Does shining laser at protective glasses damage them?

Quote:
Originally Posted by Pi R Squared View Post
The cardboard shroud sounds like a good idea as long as you don't accidentally set it on fire, there's always something that can go wrong.

Alan
Shall use this:


But you are correct; somehow, stuff always tends to go wrong.

Last edited by FalloutBe; 07-26-2014 at 10:26 AM.
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Old 07-26-2014, 04:57 PM #11
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Default Re: Does shining laser at protective glasses damage them?

Especially since you can't see the IR light... be extra careful
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Old 07-27-2014, 07:29 PM #12
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Default Re: Does shining laser at protective glasses damage them?

Those goggles are rated at OD5+ which means they should be able to take a second or so glance at 5W but any more time than that will start melting the glasses instantly. 5W is a serious amount of power. Do your test as planned with the cardboard shroud and make sure all reflective surfaces are gone from the room. All it would take is a beam reflecting off a couple of things for it to make its way around your shroud and in your eyes again.

Also.. Can a few of you read the final posts in this Another newcomer and try to knock some sense into this guy!! PLEASE!
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Old 07-28-2014, 08:51 PM #13
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Default Re: Does shining laser at protective glasses damage them?

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Originally Posted by FalloutBe View Post
Am I allowed to shine a dot through the glasses, to check (with a camera) if it gets filtered out?
Or will doing this, damage the glasses?
From specs: "Protection features: all-round reflection."

Be extremely careful as the light will be reflected who knows where.

You can take a measurement with a low (or reduced) power laser. Reflection/transmission does not depend at (low peak) power.
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Old 08-02-2014, 08:55 AM #14
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Default Re: Does shining laser at protective glasses damage them?

I just received the glasses, but don't have the laser diode yet.
I tested the glasses with my camera, and an IR LED, but unfortunately they seem to let through all of the IR light?!

The spot doesn't even look dimmer after passing through the glasses. Did I get scammed? These are 34$ glasses.
I tested the glasses in both directions, not sure if that matters.

The glasses seem to look like quality glasses, they have this coating on them which has a red-ish tint,
and when looking at them form an angle, they turn blue.

Last edited by FalloutBe; 08-02-2014 at 08:58 AM.
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Old 08-02-2014, 10:57 AM #15
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Default Re: Does shining laser at protective glasses damage them?

Quote:
Originally Posted by FalloutBe View Post
I just received the glasses, but don't have the laser diode yet.
I tested the glasses with my camera, and an IR LED, but unfortunately they seem to let through all of the IR light?!

The spot doesn't even look dimmer after passing through the glasses. Did I get scammed? These are 34$ glasses.
I tested the glasses in both directions, not sure if that matters.

The glasses seem to look like quality glasses, they have this coating on them which has a red-ish tint,
and when looking at them form an angle, they turn blue.
are you using a IR camera? or a camera modded that has the IR/UV filter removed? you may get weird results using a cam with IR/UV filter , especially with a low power LED compared to high powered diode<-- im not sure, but i would think outside the square before blaming the glasses, what wavelength are the glasses rated to cover and what is the peak wavelength of your led?
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Old 08-02-2014, 11:22 AM #16
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Default Re: Does shining laser at protective glasses damage them?

I'm using a regular camera which tends to pick up IR light. I don't know whether there is any filter built in. It's a Panasonic DMC TZ25 LUMIX.
The glasses are rated for 808, 830 and 850nm. (OD5+).

The diode is one from my TV remote controller.

Do you think the glasses will start blocking the light, only at higher intensities? Or should this be a linear characteristic (power vs blocking rate)

Last edited by FalloutBe; 08-02-2014 at 11:23 AM.
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