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Mil-Spec_PRF_31013_SPECS - Safety Goggles

Brett

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I obtained these goggles new...privately from a friend on another forum.  The price was nice, plus he sent a .pdf datasheet in advance for me to look over.  The datasheet claims the following:

The SPECS are for use by military personnel for eye protection against ballistic fragments and laser radiation at 694.3nm (ruby laser wavelength), at 1064nm (neodymium laser wavelength) and at 532nm (frequency doubled neodymium laser wavelength).

The datasheet then goes on to elaborate on the various methods of rigorous testing the military used to ensure compliance with these standards.

My friend who sold me these goggles noticed that (in spite of the fact that they aren't certified for that frequency) they seemed to block 808nm quite a bit.  He later performed a test wherein he claimed to have measured a 99.9% blockage of 808nm using his LPM.  Needless to say I will perform my own test for 808 before trusting those results.  In any case, these goggles block incredibly well at 532nm, yet enough of a spot is visible to allow focusing and other visual necessities.  I now feel a bit more secure when working with the cheaper non IR filtered DPSS lasers, yet I will always avoid direct goggled contact with the direct beam, since perforated goggles offer no protection.

Here are some pictures of the goggles:

 

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Brett

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Re: Mil-Spec_PRF_31013_SPECS   Laser Safety Goggl

Here you can see the peripheral vision protection...

 

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Brett

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Re: Mil-Spec_PRF_31013_SPECS   Laser Safety Goggl

Here's a bright ~50mw 532nm spot on white packing foam (no goggles):

 

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Brett

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Re: Mil-Spec_PRF_31013_SPECS   Laser Safety Goggl

Here's the same spot taken through the goggles:

 

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Brett

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Now, through the front of the goggles.  You can see that a large percentage of the 532nm has been absorbed (a small amount probably reflected) by the goggles.

*edit* I meant to mention as well, that if anyone is interested in trying to track down a pair of these goggles on the surplus market, I can email you a copy of the .pdf datasheet. Just PM me. -Brett

 

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I've had good experiences with the SPECs and also with the Gentex BLPS. The green lenses are great for red/IR and the brown ones are good for the entire visible spectrum. (Also the 'S' lenses on the Gentex glasses work great for blu-ray.) I think the thickness of the polycarbonate and the amount of dye used makes these a great budget alternative to commercial laser goggles. Mil-Spec equipment also has to meet ANSI/OSHA standards as they are used in a 'work' environment...

cheers,
kernelpanic
 

p.s.- those do appear to be the brown lenses you have. If so, they are rated (OD3 or 4 I think) for green...
 

Brett

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kernelpanic said:
I've had good experiences with the SPECs and also with the Gentex BLPS. The green lenses are great for red/IR and the brown ones are good for the entire visible spectrum. (Also the 'S' lenses on the Gentex glasses work great for blu-ray.) I think the thickness of the polycarbonate and the amount of dye used makes these a great budget alternative to commercial laser goggles. Mil-Spec equipment also has to meet ANSI/OSHA standards as they are used in a 'work' environment...

cheers,
kernelpanic
 

p.s.- those do appear to be the brown lenses you have. If so, they are rated (OD3 or 4 I think) for green...

Yes. They are indeed the brown lenses. Thank you for pointing out the OD rating...I am pretty sure I didn't see that in the .pdf docs.

-Brett
 




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