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Old 09-07-2007, 01:52 PM #1
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Default Re: auto darkening welding helmet?

BAD IDEA !

Your pupils dialate, and you smoke your eye sockets that way ONLy use protective eyewear designed for lasers at the specific wavelength you are testing.


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Old 09-07-2007, 02:30 PM #2
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Default Re: auto darkening welding helmet?

I wouldn't trust electronics to switch on the blanking tint and lasers beams are a different
animal all together.

My $40 sport LASER safty shades(GRN blocking) are auto darking. (NOVA brand,NOIR make)

Because the brighter the LASER the dimmer the spot.
Example:
20mw goes through the lens and makes a dim green spot on white BUT, 40mW makes no spot!

Be safe and cool, GET REAL LASER GOGGLES or do complete scientific testing before risking you PEEPS.

Cheers
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Old 09-07-2007, 03:09 PM #3
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Default Re: auto darkening welding helmet?

Bigger than the pupil diliation issue is that a laser beam could go through the eye window and completely miss the photocell sensor on the mask that darkens the LCD panel sandwiched inside it.

I think some cheaper ones just power/activate the LCD shutter directly with a solar cell, and the light given off by the welding being done in front of it powers it directly.
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Old 09-07-2007, 10:27 PM #4
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Default Re: auto darkening welding helmet?

Are those welding helmets electronically operated?

I've seen some sunglasses that work passively, where a dye is tinted due to light so they get darker with increasing brightness.

In any case, i wouldn't trust them as laser shades at all. Even if they respond well to laser light, who says its fast enough?
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Old 09-07-2007, 10:46 PM #5
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Default Re: auto darkening welding helmet?

Quote:
Originally Posted by Benm
Are those welding helmets electronically operated?

I've seen some sunglasses that work passively, where a dye is tinted due to light so they get darker with increasing brightness.

In any case, i wouldn't trust them as laser shades at all. Even if they respond well to laser light, who says its fast enough?
I don't know about welding shields, but eyeglasses work through chemistry (silver chloride or similar in glass lenses, organics in plastic lenses I think), and they actually darken due to the UV light being absorbed from the sun. It's quite a slow process, so I don't imagine it's what's used in welding, but I could be wrong.

Either way, I agree that I don't see either technology working very well, especially since laser goggles are so relatively inexpensive and proven effective anyway.
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