Dismiss Notice
Join Physics Forums Today!
The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

Reflection of a plane mirror at a focal point

  1. Apr 3, 2013 #1
    I am trying to interface a detector system to a FT-IR spectrometer. The spectrometer uses off-axis parabolic mirrors to focus light in the center of a sample compartment, where it diverges and again strikes an off axis parabolic mirror, focusing it on a detector. I would like to place a plane mirror at a 45° angle, at the focal point of the first mirror. My question is, what kind of beam divergence can I expect with this setup? The detector element itself will be housed in a dewar behind some windows and filters, approximately 6-8" from the mirror in the sample compartment. There is a compound parabolic concentrator, located about 3inches in front of the detector, with a .500" entrance aperture. Can I expect reasonable signal from this setup? This will be used in the IR, from about 20-700cm-1. Will atmospheric interference be significant? I have attached a quick sketch of the outline of the system.



    Attached Files:

  2. jcsd
Know someone interested in this topic? Share this thread via Reddit, Google+, Twitter, or Facebook

Can you offer guidance or do you also need help?
Draft saved Draft deleted

Similar Discussions: Reflection of a plane mirror at a focal point
  1. Mirror reflection (Replies: 3)