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Old 01-12-2009, 03:03 PM #1
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Default Help with reading a Safety Goggles table... :-[

Hi2all *

I've found a local shop that sells Univet safety goggles but apparently, I'm too silly to figure out which goggles I need... *:-[

Ultimately, I'd like a pair of goggles that covers everything from 400-700nm. I have a 532nm 50mW LP, I've just ordered a 650nm 200mW LP and I imagine I'll eventually end up with a 405nm (violet) and/or 473nm (blue). Heck, it wouldn't hurt if I upped the range to include 808nm since you can never tell with the economic variety 532s...

Logical options [seem to] include:
313: 190-535nm, vlt 35% (for everything but the red & IR)
310: 190-532nm + 805-1100, vlt 30% (for everything but the red)
311: 190-375nm + 595-670, vlt 20% (for UV & red)

I omitted the likes of "304" which, for alignment* purposes, covers 400-780, because it only "formally" covers 190-375... *:-/

*Last but not least, could someone kindly explain the table-column "Alignment Laser Wavelength (T>10%)" because based on this col., most of their goggles covers the visible spectrum... . Of course I do assume "T" to represent transmission, and ">10%" not to be a particularly great figure... but what does it mean? That the laser point's "wash" is minimised but you have no protection from the actual beam or reflections of said beam...?


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Old 01-12-2009, 09:50 PM #2
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Default Re: Help with reading a Safety Goggles table... :-

Click on the filter code to see the attenuation graph. What they consider T>10% means that if the transmission is greater than 10% it is considered as visibly transmitted wavelength. The graph will demonstrate this. You will see the transmittance rise as the OD falls across the spectrum. The T>10% means these are the wavelengths not designed to be attenuated.
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Old 01-13-2009, 04:13 PM #3
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Default Re: Help with reading a Safety Goggles table... :-

Quote:
Originally Posted by FrothyChimp
Click on the filter code ... if the transmission is greater than 10% it is considered as visibly transmitted wavelength.
Hi & Thanks for the help! So why do they even bother indicating what wavelengths will not be attenuated?

So using 310 as an example, the graph shows that it is around OD 6 from 200-532 where transmission is effectively 0. Then we have the opposite in the 532-790 region, followed by OD 7+ for 800-1100nm.

Got it. Just ignore the silly L.A.T.* col. and stick to the specified "wavelengths per OD levels". I mean, what interest is it to comment on "visible" wavelengths when IR can be just as dangerous to the eyes...?

*Does "Laser Alignment" require being able to view the beam at >10% transmission...? Well, we can do that without any goggles... don't get it *:-/ looks like I need a few more [hundreds of] hours of flight-time in the forums & in Wikipedia...
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Old 01-21-2009, 04:24 PM #4
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Default Re: Help with reading a Safety Goggles table... :-

Thanks again FrothyChimp,

I just picked up two pairs of their "531" style goggles, the 311s (625-670) & 313s (190-543). they cost me 100 and 80 respectively, but that includes EU's hefty 20% sales tax.

I (of course) checked OEM Systems first but after factoring shipping, EU Customs (anywhere from 10-16%...) and the 20% sales tax on top of it all, even the Low OD "Hobby" versions would cost almost as much and the Univets are rated at 5 OD.

So thanks again fro helping me figure it all out - very nice of ya *8-)
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