INTELLIGENT WORK FORUMS
FOR ENGINEERING PROFESSIONALS

Log In

Come Join Us!

Are you an
Engineering professional?
Join Eng-Tips Forums!
  • Talk With Other Members
  • Be Notified Of Responses
    To Your Posts
  • Keyword Search
  • One-Click Access To Your
    Favorite Forums
  • Automated Signatures
    On Your Posts
  • Best Of All, It's Free!

*Eng-Tips's functionality depends on members receiving e-mail. By joining you are opting in to receive e-mail.

Posting Guidelines

Promoting, selling, recruiting, coursework and thesis posting is forbidden.

Jobs

Best material for IR transparency in the 7.5 - 13.5 micrometer range

Best material for IR transparency in the 7.5 - 13.5 micrometer range

Best material for IR transparency in the 7.5 - 13.5 micrometer range

(OP)
I want to build a camera gimbal dome to cover a flir Tau IR camera (7.5-13.5 micrometer band, or Long Wavelength IR) as well as a visible spectrum camera.

What would be a good polymer to use for such an application, taking factors such as impact resistance and manufacturing difficulty into account?

Thank you in advance.
Michael

------------------------------------------
Here's looking at you, looking at me, looking at you

RE: Best material for IR transparency in the 7.5 - 13.5 micrometer range

(OP)
Thank you IRstuff.

Am I correct in saying that perspex is out of the question, but polycarbonate might also work?

Michael

------------------------------------------
Here's looking at you, looking at me, looking at you

RE: Best material for IR transparency in the 7.5 - 13.5 micrometer range

IRstuff,

Your recommendations are for IR only, correct? They do not seem like good ones for visible spectrum transparency.

Michael,

In general, polycarbonate would be favored in these types of applications due to its high impact resistance, while acrylic (PMMA, Perspex) has poor impact resistance.

RE: Best material for IR transparency in the 7.5 - 13.5 micrometer range

Yeah, I had originally thought he was talking about the windows, but then decided he was actually talking about the gimbal housing itself, which does not need to be transparent.

So, Michael, perhaps you can clarify whether you intend to be able to see through the "dome."

If so, your cost probably grew by a couple orders of magnitude. Most polymers that are "transparent" in the LWIR are not particularly transparent in the visible. Zinc Selenide is pretty much the only crystalline material usable in the visible and LWIR, but there is some "color" to its visible transmissivity.

TTFN
FAQ731-376: Eng-Tips.com Forum Policies

Need help writing a question or understanding a reply? forum1529: Translation Assistance for Engineers

Of course I can. I can do anything. I can do absolutely anything. I'm an expert!

Red Flag This Post

Please let us know here why this post is inappropriate. Reasons such as off-topic, duplicates, flames, illegal, vulgar, or students posting their homework.

Red Flag Submitted

Thank you for helping keep Eng-Tips Forums free from inappropriate posts.
The Eng-Tips staff will check this out and take appropriate action.

Reply To This Thread

Posting in the Eng-Tips forums is a member-only feature.

Click Here to join Eng-Tips and talk with other members!


Resources


Close Box

Join Eng-Tips® Today!

Join your peers on the Internet's largest technical engineering professional community.
It's easy to join and it's free.

Here's Why Members Love Eng-Tips Forums:

Register now while it's still free!

Already a member? Close this window and log in.

Join Us             Close