Lens for linear aperture fluorescent tube
From: Doug Goncz (dgoncz_at_aol.com)
Date: 11/21/04
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Date: 21 Nov 2004 18:52:10 GMT
Given an emissive surface 5/8 inch diameter within a fluorescent tube and a
clear 5/16 inch window aperture the length of the tube, how might one explore
the characteristics of a beam output through a linear lens laminated to the
tube?
With ray tracing sofware, of course.
Any freebies available?
And are such packages capable of considering a tube of finite length 4 3/8
inches and the resultant combinations of rays normal to the axis with rays not
normal?
I certainly would *hate* to try setting this up in Mathcad, but I could. I am
pretty good with Mathcad. I'd really rather not, though, unless the discussion
here goes symbolic. Then I can just optimize an integral for intensity on the
center line normal to the axis and be done with it. Could that be done with
certain simplifying assumptions about the lens shape? Cylindrical, parabolic,
etc?
I guess in Mathcad I'd generate rays that pass through the aperture, refract
them in the lens, and plot them, then draw a contour plot for beam shape, and
animate using the lens curvature as a single parameter, leaving the inside the
5/16 inch negative curvature as a meniscus, or something like that.
Let's start with this: For polymethylmethacrylate, inside radius 5/16 inch,
what is the outside radius of a meniscus lens that will focus 5/8 inch BFL?
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