Author Topic: Are the green glasses from Chinese kits safe?  (Read 2646 times)

Uglulyx

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Re: Are the green glasses from Chinese kits safe?
« Reply #30 on: December 16, 2016, 02:38:14 PM »
Anyone know if these glasses work for a violet laser?


https://www.amazon.ca/DEWALT-DW0714-Laser-Enhancement-Glasses

ThothLoki

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Re: Are the green glasses from Chinese kits safe?
« Reply #31 on: December 16, 2016, 02:45:11 PM »
I would not use those. Those ENHANCE laser visibility. You want to decrease visibility. The ones that I bought work very well and are very comfortable (link in earlier post).

Remember, you get what you pay for.
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Uglulyx

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Re: Are the green glasses from Chinese kits safe?
« Reply #32 on: December 16, 2016, 02:47:52 PM »
I believe you actually have the same laser as me. How did you find the wavelength for your module?

ThothLoki

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Re: Are the green glasses from Chinese kits safe?
« Reply #33 on: December 16, 2016, 04:33:15 PM »
If you have a blue or violet laser, it will be in the 400-450ish nm wavelength.

https://en.m.wikipedia.org/wiki/Blue_laser

The glasses I linked to, which are the same ones as Admin's glasses will block 190-550nm
These are also OD6 which will reduce the intensity by a factor of 1,000,000

Compared to the cheap ones I got with the engraver, I cannot see the beam with these.
Laser: A5 2000mw with L7 Board
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Uglulyx

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Re: Are the green glasses from Chinese kits safe?
« Reply #34 on: December 16, 2016, 04:47:41 PM »
Any idea if there's a Canadian source for those? Shipping across the border is murder.

Edit: Saw an earlier post jokingly mention using a welding mask... Would that actually work? Welding googles may actually be more accessible for me.
« Last Edit: December 16, 2016, 06:21:13 PM by Uglulyx »

ThothLoki

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Re: Are the green glasses from Chinese kits safe?
« Reply #35 on: December 16, 2016, 07:49:42 PM »
I have a welding mask but being that it is not made for laser, I don't trust it. The website I linked to earlier has an international site. I will try to find it. I believe the shipping rate is a flat $32usd.

I will edit this post with the link when I get to my computer.

***EDIT***
http://www.survivallaser.com/Safety_Goggles/cat556089_826120.aspx
Here you go!
« Last Edit: December 16, 2016, 07:56:19 PM by ThothLoki »
Laser: A5 2000mw with L7 Board
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ThothLoki

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Re: Are the green glasses from Chinese kits safe?
« Reply #36 on: December 16, 2016, 08:56:02 PM »
Worst case, do what I did when I had the cheap Chinese glasses. I took a cardboard box, cut a hole in it and mounted a computer fan. Put that over your engraver and look through the fan to monitor. Still use glasses.

Or better yet, add a webcam in the box to monitor on your computer.
Laser: A5 2000mw with L7 Board
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fvuichard

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Re: Are the green glasses from Chinese kits safe?
« Reply #37 on: March 16, 2017, 07:03:02 AM »
Hi everyone,

Being new to laser engraving, I read carefully a lot of your post.

Having received with my kit (eleksmaker A3, laser 1600mw, 445nm) a pair of green glasses for free, I also wondered what it was about the quality of this one.
Having a spectrophotometer at work, I was able to make a small test to see what wavelength was filtered by this glasses.

You can see the result in the attached image.

At 445 nm 99.6% of the light is filtered.

It will seem that these glasses work very well for lasers of 445nm.
« Last Edit: March 16, 2017, 07:07:40 AM by fvuichard »
Eleksmaker A3 1600mW - Arduino Mana SE

ThothLoki

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Re: Are the green glasses from Chinese kits safe?
« Reply #38 on: March 16, 2017, 07:22:02 AM »
Hi everyone,

Being new to laser engraving, I read carefully a lot of your post.

Having received with my kit (eleksmaker A3, laser 1600mw, 445nm) a pair of green glasses for free, I also wondered what it was about the quality of this one.
Having a spectrophotometer at work, I was able to make a small test to see what wavelength was filtered by this glasses.

You can see the result in the attached image.

At 445 nm 99.6% of the light is filtered.

It will seem that these glasses work very well for lasers of 445nm.

They do work.....just not well. I can tell you from experience that I can still see some of the laser beam. After checking on your project a few times, your eyes start to feel scratchy. I upgraded my glasses to OD6 rated glasses and the scratchy eye syndrome went away. Link to what I use now is in above in this thread.
Laser: A5 2000mw with L7 Board
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Administrator

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Re: Are the green glasses from Chinese kits safe?
« Reply #39 on: March 16, 2017, 08:09:15 AM »
>At 445 nm 99.6% of the light is filtered.
>It will seem that these glasses work very well for lasers of 445nm.

Thanks for verifying the Green glasses...!!!
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fvuichard

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Re: Are the green glasses from Chinese kits safe?
« Reply #40 on: March 16, 2017, 09:05:27 AM »
Indeed, the spectrophotometer does not have the power of a laser. :-\
Maybe the remaining 0.4% is enough to cause eye problems if you look directly at the point of contact of the laser.

But I think this is ok for the reflections of it.
« Last Edit: March 16, 2017, 09:06:07 AM by fvuichard »
Eleksmaker A3 1600mW - Arduino Mana SE

ThothLoki

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Re: Are the green glasses from Chinese kits safe?
« Reply #41 on: March 16, 2017, 09:13:22 AM »
fvuichard

Being that I do not have those fancy tools, could you tell me what OD rating those green glasses would be?
Laser: A5 2000mw with L7 Board
OS: Windows 10
Software: T2L
Image Resizer Applications: http://benboxlaser.us/index.php/topic,1434.msg20182.html#msg20182

ROSS

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Re: Are the green glasses from Chinese kits safe?
« Reply #42 on: March 16, 2017, 09:22:40 AM »
Once again.... I reiterate...Zax gave a good  couple of posts about glasses some time ago.  They are still on the forum.
.
Lasers are wonderful machines..not ONLY  can they cut a finger off BUT  they can also cauterise it at the same time.....

SAFETY -  IS NO ACCIDENT

fvuichard

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Re: Are the green glasses from Chinese kits safe?
« Reply #43 on: March 16, 2017, 12:35:17 PM »
I found this on google:

Optical Density (OD) is a measure of the attenuation of energy passing through a filter. The higher the OD value, the higher the attenuation and the greater the protection level. In other words, OD is a measure of the laser energy that will pass through a filter.
OD is the logarithmic reciprocal of transmittance, expressed by the following: D? = -log10 T ?, where T is transmittance.


So if T=0.4% OD= 2.4



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laser_cutter

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Re: Are the green glasses from Chinese kits safe?
« Reply #44 on: March 22, 2017, 10:07:55 PM »

I use regular sunglasses UNDERNEATH the green classes, allows me to see better with the laser is on.