Material transmissive to visible light but blocks IR of zappers ?

IR filter from a camera?

Sunglasses ?

More realistically, we have all seen those super insulated argon filled windows and doors.

Some of them are not totally dependent upon the gas fill for their insulative qualities. Some of them are also metal evaporated or metal sputterred on the glass. This makes them reflect IR, near and far actually as it is to be heat insulator.

These doors/windows are quite expensive, but maybe you could find one that is broken and just take the glass you need. Any of the pieces could be large enough. I have seen these and I get the impression that they are like crown glass, which is softer. This depositing of the metal might not work as well on flint type glass. That is just a guess. Hell it could be a film.

Tell you what else, I just remembered the name - REFRACTORY. This refers to a furnace. Companies that run or build refractories might have what you need. When they close the door to a furnace and kick it up to a million degrees, they do not need sunburnt eyelids from looking through the glass. Maybe some kilns have something that'll work also, who knows.

Well, I just threw a few ideas out there. Might work or not.

I just tried some mylar film , shiney side out but the IR passes and display not really visible in normal light

Tried some PTFE, and a wodge of those antistatic bags, pink and "smoked glass" types - still searching for non-exotic material

I would second that.

Here's a youtube video showing someone removing one from a camera. Not only would you get your filter, you would also get an infra-red camera! (Not one of those heat seeking ones, mind).

Gareth.

which

mica,

only

The only ones I've seen are no more than 10mm square over a CCD chip

I see the "father" of remote controls died this week.

That yellow plastic sheet that was used inside shop windows, that were fully in the sun, were anti-UV I suppose

Mount a permanently lit IR LED near the sensor. Strike it blind ;-)

Short pass filters are harder to make than long pass. You might try Edmund Optics.

Cheers

Phil Hobbs

der &

ch

a,

ble

Does a "Type A" filter signify anything useful? The price at American Science and Surplus is right:

der &

ch

a,

ble

I found these people EXPERTS, they used to make all kinds of optical band splitters for us.

Also, color correction filters for optic sensors

Optical Coating Lab, Inc.

Not in this case. It either converts daylight film for use with 3200K lighting, or vice-versa. (Such filters normally have a two-digit number starting with 8, followed by a letter.)

how about a "hot mirror" photographic filter?

they're for old digital cameras that are sensitive to IR.

they appear to be some sort of dichroic filter and their color changes depending on what angle you look at them. They look clear straight on.

Tiffen made them at some point.

encoder &

which

mica,

visible

I suppose you could try this:

mind the wrap

?-)

Water.

Greg

encoder &

which

mica,

visible

I tried that yesterday , using a large jam jar , IR passes but perhaps repeat with something square as the IR may have gone round the water