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

How to obtain beam spread angle of a parabolic reflector?

  1. Oct 21, 2013 #1
    Hi i am new to the forum and hopefully i can get some help.

    I am trying to design a small parabolic light reflector that can be used with an LED array as being the source of light. The diameter of the LED array is 18.75mm. I am trying to obtain equations that would relate the diameter and height of the reflector with the beam spread angle. This way i can change the dimensions of the reflector to affect the angle i want to achieve. As an example i want to achieve a total of 70 degrees beam spread with the source being 18.75mm and placed on the focus point of the reflector. How can i find the diameter and height of the reflector with this information? any help is appreciated. thanks
     
  2. jcsd
  3. Oct 22, 2013 #2

    Andy Resnick

    User Avatar
    Science Advisor
    Education Advisor
    2016 Award

    Nonimaging optics is practically it's own branch of science, essentially disconnected from everything else.

    http://en.wikipedia.org/wiki/Nonimaging_optics

    This book (http://books.google.com/books?id=ykk1xQc25c0C&dq=Anidolic&source=gbs_navlinks_s) seems to be the primary resource in the field.

    You may find some useful information here:
    http://reflector-design.com/files/Computer_Aided_Optical_Design_Kusch_Oleg.pdf

    It sounds like what you are asking relates to the design of searchlights, so look around for work based on the Mangin-Chikolev equation. Good luck....
     
Know someone interested in this topic? Share this thread via Reddit, Google+, Twitter, or Facebook