Materials that allow IR or UV light to pass through?

  • #1
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2

Main Question or Discussion Point

Glass allows visible light to pass through I would like to find a list of materials that allows lights of different EM spectrum to pass through, not just the above, Searched throughout google, couldn't find any!.
 

Answers and Replies

  • #4
pbuk
Science Advisor
Gold Member
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To the moderators: could we leave this here as a demonstration/tutorial of "Google-fu?"
I am not a moderator, but as the link contains information specific to your browser, and the selection of search terms requires knowledge that germanium has some of the desired properties I think there is scope to improve the example.
 
  • #5
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Glass allows visible light to pass through I would like to find a list of materials that allows lights of different EM spectrum to pass through, not just the above, Searched throughout google, couldn't find any!.
Can't say about UV, but a wide variety of materials are used to make windows for electrical enclosure IR thermography.

Which one serves best in a particular application is a trade-off between the required range of wavelengths, cost, fragility, toxicity, and the material's propensity to haze over. Search for "IR window material" ... a fair amount of information is available from manufacturers and vendors of these products such as from IRISS and Cordex Instruments (PDF guidebook).
 
  • #6
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A quick search did not prove very fruitful. Glass is not transparent to IR, as you can see in the man's glasses in the picture above, as well as at 0:20 in this video. However, at 0:52 in the same video you can see that glass does reflect IR to some extent (when the hand is on the same side as the glass). As we've seen, the absorbance of light depends very much on the wavelength, so first you would need to figure out which wavelengths the opponent's IR LED would output. It may be hard to find a common material that absorbs through that entire IR spectrum, so don't forget there are many ways to skin a cat! Alternatives to making your bot out of an IR absorbent material:

  • Reflect the incoming IR at angles away from the opponent's detector
  • Make your bot out of material transparent to IR
  • Produce additional IR in order to interfere with the opponent's detector (TV remote would work)

Dron Study
 

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