I am looking for a material that blocks the visible spectrum but lets IR light through with little problem. Preferably a film or some kind of easily obtainable plastic. Thanks!
2007-04-20 10:37:49 · 7 answers · asked by Off the Grid 1 in Science & Mathematics ➔ Engineering
In the photography world, it's called an R72 or RM90 filter.
R72 lets through infrared rays over 720nm, while RM90 lets in infrared rays over 900nm. Expensive and I'm not sure what it's made of, but it's a lead...
http://www.adorama.com/HY77RM72.html?searchinfo=infrared%2077mm&item_no=4
Here is a recent sample I took with an R72 and a digital camera...
http://www.pbase.com/ken_fong/image/77220393
2007-04-20 10:49:53 · answer #1 · answered by Ken F 5 · 0⤊ 0⤋
Look into "metalized glass filters". I know they make a filter that blocks all visible light, and lets only UV pass through (a much simpler prospect), and they make visible nuetral filters, as well as a ton of color-specific filters... They may have a way to do what your looking for as well, however blocking otu high energy while letting weaker energy pass is alot more difficult.
2007-04-20 10:51:59 · answer #2 · answered by The Big Lebowski 3 · 0⤊ 0⤋
There are reddish filters that do that kind of blocking. Look on the front of your TV remote's IR emitter to see an example of blocking most visible but letting IR through.
Try Edmund Scientific at http://scientificsonline.com/category.asp_Q_c_E_424411
They are known for a great variety of optical gadgets like those at decent prices.
2007-04-20 11:55:35 · answer #3 · answered by Rich Z 7 · 0⤊ 0⤋
In the realm of photography, you can get IR film, and visible light blocking filters. Other than those applications, I am not readily knowledgable on finding a commercially available filter that will block visible spectrum and allow the IR in.
2007-04-20 10:51:29 · answer #4 · answered by jedi_six 3 · 0⤊ 0⤋
Off the Grid, the only thing I can find is an Infrared Filter. There are filters that you buy from Photography shops, and there are also filters that are "homemade." According to the link below, you can use an exposed camera film as a filter.
2007-04-20 10:48:35 · answer #5 · answered by Dowland 5 · 0⤊ 0⤋
Silicon will do such a thing. It is transparent to infrared light, but opaque to visible light.
2007-04-20 14:49:48 · answer #6 · answered by fletchermse 2 · 0⤊ 0⤋
I'm not sure about pure IR but I know the dark area on 35mm negatives filters vicible but allows near IR and maybe IR as well.
2007-04-20 10:47:43 · answer #7 · answered by Jake in Indiana 5 · 0⤊ 0⤋