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How do thermal lenses work?


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#1 jcmurdoch

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Posted 29 April 2013 - 04:23 PM

I've heard a lot about thermal lenses in paintball masks and how they are better, but in all honesty I have no idea how they work, and why that makes them better.
If anybody knows, I would very much appreciate it

#2 andrewthewookie

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Posted 29 April 2013 - 04:30 PM

Thermal lenses are actually two separate lenses layered on top of each other, with a space of air in between them. This space of air acts as an insulator between them, so one single lens isn't experiencing a drastic temperature differential, like a single pane lens might between the outside and the hot air next to your face.

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#3 imnothim

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Posted 29 April 2013 - 06:58 PM

Ideally, and i don't know if this is true with paintball masks, the gap between lenses should either contain a vacuum or an inert gas (argon is used in windows for example.)

#4 Jawz

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Posted 29 April 2013 - 09:12 PM

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#5 SAHeatpb

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Posted 29 April 2013 - 09:27 PM

Because in the beginning Morgan Freeman narrated that there will be a lense that shall not fog up easily and then the thermal lens was born. Never question Morgan Freeman's work; he might be right behind you.

#6 The Inflicted

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Posted 07 May 2013 - 05:19 PM

Thermal lenses are actually two separate lenses layered on top of each other, with a space of air in between them. This space of air acts as an insulator between them, so one single lens isn't experiencing a drastic temperature differential, like a single pane lens might between the outside and the hot air next to your face.


It also helps that the inner lens is much thinner and made from a less dense plastic than the main lens, so it warms up to the temperature of your sweat and breath faster, inhibiting condensation.

#7 jcmurdoch

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Posted 08 May 2013 - 04:18 PM

Also, would somebody mind explaining why this makes them better than the antifog coatings that many entry level masks have

#8 The Inflicted

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Posted 14 May 2013 - 10:06 PM

It's simply more effective and lasts longer.

In terms of their ability to inhibit fogging, dual-paned thermal lenses never "wear out." (They eventually need to be replaced for other reasons)

Coated or treated lenses, on the other hand, work by having some kind of film or coating on the inside that is hydrophobic or that fills in all the pores in the outer layer of the plastic.
Over time, these treatments can either evaporate or be rubbed off from regular use.
If you're familiar with scuba masks, this is why a new layer of anti-fog treatment is applied every time you dive. It simply wears off.

#9 SAHeatpb

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Posted 15 May 2013 - 10:32 AM

I think my theory wins and any other is just blasphemy.

#10 BraiNfreeZe

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Posted 16 May 2013 - 07:34 PM

Because in the beginning Morgan Freeman narrated that there will be a lense that shall not fog up easily and then the thermal lens was born. Never question Morgan Freeman's work; he might be right behind you.


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