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Material transmissive to visible light but blocks IR of zappers ?

N

N_Cook

Jan 1, 1970
0
Or at least translucent to visible. Hopelessly undiscriminating IR encoder &
decoder on a piece of kit but need to see the LED segment display , which
inconveniently has the IR Rx within it.
I've tried loads of normal materials like polythene,perspex, glass, mica,
silicone rubber.
I know black polythene will transmit the IR of PIR units and block visible
but there is more seperation of f there
 
A

Adrian C

Jan 1, 1970
0
Or at least translucent to visible. Hopelessly undiscriminating IR encoder&
decoder on a piece of kit but need to see the LED segment display , which
inconveniently has the IR Rx within it.
I've tried loads of normal materials like polythene,perspex, glass, mica,
silicone rubber.
I know black polythene will transmit the IR of PIR units and block visible
but there is more seperation of f there

IR filter from a camera?
 
N

N_Cook

Jan 1, 1970
0
Jeff Urban said:
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.

J


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

N_Cook

Jan 1, 1970
0
Tried some PTFE, and a wodge of those antistatic bags, pink and "smoked
glass" types - still searching for non-exotic material
 
N

N_Cook

Jan 1, 1970
0
Gareth Magennis said:
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.

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.
 
N

N_Cook

Jan 1, 1970
0
That yellow plastic sheet that was used inside shop windows, that were fully
in the sun, were anti-UV I suppose
 
A

Adrian C

Jan 1, 1970
0
Or at least translucent to visible. Hopelessly undiscriminating IR encoder&
decoder on a piece of kit but need to see the LED segment display , which
inconveniently has the IR Rx within it.
I've tried loads of normal materials like polythene,perspex, glass, mica,
silicone rubber.
I know black polythene will transmit the IR of PIR units and block visible
but there is more seperation of f there

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

William Sommerwerck

Jan 1, 1970
0
Does a "Type A" filter signify anything useful?

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.)
 
C

Cydrome Leader

Jan 1, 1970
0
N_Cook said:
Or at least translucent to visible. Hopelessly undiscriminating IR encoder &
decoder on a piece of kit but need to see the LED segment display , which
inconveniently has the IR Rx within it.
I've tried loads of normal materials like polythene,perspex, glass, mica,
silicone rubber.
I know black polythene will transmit the IR of PIR units and block visible
but there is more seperation of f there

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.
 
J

josephkk

Jan 1, 1970
0
Or at least translucent to visible. Hopelessly undiscriminating IR encoder &
decoder on a piece of kit but need to see the LED segment display , which
inconveniently has the IR Rx within it.
I've tried loads of normal materials like polythene,perspex, glass, mica,
silicone rubber.
I know black polythene will transmit the IR of PIR units and block visible
but there is more seperation of f there
I suppose you could try this:

http://apex-window-film-store.com/s...ctid=17646&cat=259&page=&is_featured_product=


mind the wrap

?-)
 
G

gregz

Jan 1, 1970
0
N_Cook said:
Or at least translucent to visible. Hopelessly undiscriminating IR encoder &
decoder on a piece of kit but need to see the LED segment display , which
inconveniently has the IR Rx within it.
I've tried loads of normal materials like polythene,perspex, glass, mica,
silicone rubber.
I know black polythene will transmit the IR of PIR units and block visible
but there is more seperation of f there

Water.

Greg
 
N

N_Cook

Jan 1, 1970
0
...
Water.

Greg

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
 
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