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| − | <center>[[File:DC_stereo.png]]</center>
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| − | Using Mathematica, we can produce a 3D rendering of how the sectors for Level 1 would have to interact with a steady angle theta with respect to the beam line, as angle phi is rotated through 360 degrees.
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| − | <center>[[File:PhiCone.png]]</center>
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| − | Looking just at sector 1, we can see that the intersection of level 1 and the cone of constant angle theta forms a conic section.
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| − | <center>[[File:Projection_side_view.png]]</center>
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| − | <center>[[File:Projection_Rear_view.png]]</center>
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| − | Following the rules of conic sections we know that the eccentricity of the conic is given by:
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| − | <center><math>e=\frac{\sin \beta}{\sin\alpha}</math></center>
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| − | Where β is the angle of the plane, and α is the slant of the cone.
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| − | If the conic is an circle, e=0
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| − | If the conic is an parabola, e=1
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| − | If the conic is an ellipse, <math>e=\sqrt{1-\frac{b^2}{a^2}}</math>
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| − | <center>[[File:Conic_section.png]]</center>
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| − | For ellipses centered at (j,k):
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| − | <center><math>\frac{(x-j)^2}{a^2}+\frac{(y-k)^2}{b^2}=1</math></center>
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| − | where
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| − | a = major radius (= 1/2 length major axis)
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| − | b = minor radius (= 1/2 length minor axis)
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| − | For a parabola:
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| − | <center><math>4px = y^2</math></center>
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| − | where
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| − | p = distance from vertex to focus (or directrix)
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