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  1. dsiap

    Suitable (cheap) mid IR polymer window

    Thanks for all the replies guys. "The way that most people measure transmissivity, scatter ought not substantially affect that" What method would that be? As I understand it, measurement of diffuse transmission in the IR spectrum is fairly problematic and the error is significant. I started...
  2. dsiap

    Suitable (cheap) mid IR polymer window

    Hi Dr DeArmitt, So I've worked with IR spectrometry before, and I am aware that both ptfe and polystyrene have almost 0 absorption in the range I'm interested in. Polyethylene in fact is something I want to stay away from as there is a strong C-H mode there. I see now I wasn't clear in my...
  3. dsiap

    Suitable (cheap) mid IR polymer window

    Yes we are trying to image. I'm currently gathering stuff and trying em... just figured I'd get a good handle on exactly what to gather.
  4. dsiap

    Suitable (cheap) mid IR polymer window

    So, to reiterate, the window is going to be mounted on a wind tunnel. We are still in the planning phase so actively heating whatever's inside the tunnel is not out of the question, but obviously not to combustion temperatures... It's unclear exactly what kind of temperature gradients we will...
  5. dsiap

    Suitable (cheap) mid IR polymer window

    For clarity, what I need is IR transparency in the 3-5 micron range (mid range), and some small level of rigidity. I know that I can use a crystal like say CaF2 for this but according to the FTIR it seems like both Polytetrafluoroethylene and polystyrene should work. However according to some...
  6. dsiap

    Suitable (cheap) mid IR polymer window

    Hi. I'm looking to make a window that is IR transparent in the 3-5 micron range. I found a paper online that said teflon/Polytetrafluoroethylene had near 100% transmissivity here, but another paper that said exactly the opposite for a thinner sample. It doesn't look like there's a ton of...

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