Material transmissive to visible light but blocks IR of zapp

N

N_Cook

Guest
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
 
On 24/05/2012 08:15, N_Cook wrote:
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?

--
Adrian C
 
Jeff Urban <jurb6006@gmail.com> wrote in message
news:01265ab8-01a5-4c2b-bfaf-1aeeed5f9eed@w19g2000yqb.googlegroups.com...
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
 
Tried some PTFE, and a wodge of those antistatic bags, pink and "smoked
glass" types - still searching for non-exotic material
 
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
 
"Adrian C" <email@here.invalid> wrote in message
news:a269b6Fg69U1@mid.individual.net...
On 24/05/2012 08:15, N_Cook wrote:
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?

--
Adrian C

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).

http://www.youtube.com/watch?v=dvCzbPVXZWk


Gareth.
 
Gareth Magennis <sound.service@btconnect.com> wrote in message
news:LoudnSa4cuIysyPSnZ2dnUVZ7oqdnZ2d@bt.com...
"Adrian C" <email@here.invalid> wrote in message
news:a269b6Fg69U1@mid.individual.net...
On 24/05/2012 08:15, N_Cook wrote:
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?

--
Adrian C



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).

http://www.youtube.com/watch?v=dvCzbPVXZWk


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.
 
That yellow plastic sheet that was used inside shop windows, that were fully
in the sun, were anti-UV I suppose
 
On 24/05/2012 08:15, N_Cook wrote:
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 ;-)

--
Adrian C
 
N_Cook wrote:
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
Short pass filters are harder to make than long pass. You might try
Edmund Optics.

Cheers

Phil Hobbs
--
Dr Philip C D Hobbs
Principal Consultant
ElectroOptical Innovations LLC
Optics, Electro-optics, Photonics, Analog Electronics

160 North State Road #203
Briarcliff Manor NY 10510
845-480-2058

hobbs at electrooptical dot net
http://electrooptical.net
 
On May 24, 3:54 pm, Phil Hobbs
<pcdhSpamMeSensel...@electrooptical.net> wrote:
N_Cook wrote:

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

Short pass filters are harder to make than long pass.  You might try
Edmund Optics.
Does a "Type A" filter signify anything useful? The price at American
Science and Surplus is right:

http://www.sciplus.com/category.cfm/subsection/21/category/191
 
On May 24, 3:54 pm, Phil Hobbs
<pcdhSpamMeSensel...@electrooptical.net> wrote:
N_Cook wrote:

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

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

Cheers

Phil Hobbs
--
Dr Philip C D Hobbs
Principal Consultant
ElectroOptical Innovations LLC
Optics, Electro-optics, Photonics, Analog Electronics

160 North State Road #203
Briarcliff Manor NY 10510
845-480-2058

hobbs at electrooptical dot nethttp://electrooptical.net
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.
2789 Northpoint Parkway
Santa Rosa, CA 95407-7350
707 545 6440
 
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.)
 
N_Cook <diverse@tcp.co.uk> wrote:
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.
 
On Thu, 24 May 2012 08:15:46 +0100, "N_Cook" <diverse@tcp.co.uk> wrote:

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/store/product.php?mode=add&productid=17646&cat=259&page=&is_featured_product

mind the wrap

?-)
 
gregz <zekor@comcast.net> wrote in message
news:1368110994359832007.770440zekor-comcast.net@news.eternal-september.org.
...
"N_Cook" <diverse@tcp.co.uk> wrote:
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
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
 
"N_Cook" <diverse@tcp.co.uk> wrote:
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
 

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