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Add helix bundle illustration

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jaseg 2024-08-30 18:02:27 +02:00
parent c72e3df04c
commit 51bcb765e4
14 changed files with 42 additions and 21 deletions
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17
chapter-qkd/chapter.tex
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@ -683,7 +683,22 @@ common \qty{0.9}{\milli\meter} fiber pigtails.
\todo{cite bend radius spec. fs.com has some on their pigtails. thorlabs on their SM-28 fiber has no spec, but specs
loss at \qty{25}{\milli\meter} radius.}
While
\begin{figure}
\centering
\subcaptionbox[Helical transition of single fiber]{Single fiber}{\includegraphics[width=.45\textwidth]{\scaledgraphics{helix_transition.png}}}
\hfill
\subcaptionbox[Helical transition of fiber bundle]{Fiber bundle}{\includegraphics[width=.45\textwidth]{\scaledgraphics{helix_bundle.png}}}
\caption[Helically coiling fibers inside the axis tube]{
The necessary mesh spacing can be reduced by coiling the fibers inside of the axis tube. The coiled fibers enter
the inter-mesh space at an angle equal to the helix lead angle, which reduces the amount of space necessary to
complete the transition to horizontal along a circular arc. In this example, a \qty{6}{\milli\meter} outer
diameter tube with a \qty{0.5}{\milli\meter} wall thickness is shown with 6 fibers with \qty{0.9}{\milli\meter}
outer diameter coiled to a constant bend radius of \qty{9}{\milli\meter}. The lead angle of the resulting helix
is \qty{61.5}{\degree}, and past the tube exit, only \qty{5.16}{\milli\meter} of inter-mesh space are necessary.
\figureattrib{helix_transition.png}}
\end{figure}
Based on these specifications and adding some \qty{10}{\milli\meter},
\todoplaceholder{Finish this part.}