QKD meshes WIP
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3 changed files with 103 additions and 4 deletions
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@ -682,14 +682,16 @@ fiber optics.\todo{cite bend radius spec}
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To increase the difficulty of inserting a long and flexible tool through the axis shield, \todo{Axis shield might be a
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nice term. Unify terminology for axis/shaft, the shield, the names of the two meshes, and the tabs sticking up from the
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meshes. Also what do we call the space in between? Terminology for the sides with offset meshes?} the shape of the
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interface layer between the two meshes can be made more complex. By introducing small mesh \emph{tabs} that stick out
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into the inter-mesh space from both meshes, creating a labyrinth-like structure that requires structural support and
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cables to pass in a series of \qty{90}{\degree} bends.
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interface layer between the two meshes can be made more complex. Introducing small mesh \emph{tabs} that stick out
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into the inter-mesh space from both meshes creates a labyrinth-like structure between the axis opening and the IHSM's
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inside. Structural support and cables can easily pass this structure in a series of \qty{90}{\degree} bends, while
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inserting a probe avoiding both meshes would not be feasible as the probe would have to perform a series of sharp
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bends.
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\begin{figure}[h!]
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\centering
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\includegraphics[width=.7\textwidth]{\scaledgraphics{wikimedia_Four_Corners_Bank_Vault_cropped.jpg}}
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\caption[Photo of a bank vault door]{\draftgraphics Photo of a bank vault door at the Four Corners building in
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\caption[Photo of a bank vault door]{\camerareadygraphics Photo of a bank vault door at the Four Corners building in
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Bowling Green, Ohio, USA. The interface between the door and its frame is stepped all around to discourage would-be
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intruders from inserting any sort of tool through the small gap around the closed door. In this instance, because
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the door's sill is stepped, too, a small ramp has been placed over the sill so that people going in and out of the
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@ -707,6 +709,14 @@ electromagnetic probes. The one difference between these doors and what we can d
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limited to outwards-facing steps because they must be opened and closed. In IHSM labyrinth meshes, we can use both
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outwards-facing and inwards-facing steps.
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Concentric labyrinth meshes allow for a wide range of different configurations. The pitch from one mesh tab to the
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next is the sum of the required width of the inter-mesh space and the safety margin needed betwween any cables or the
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inter-mesh bracket and the tabs. This safety margin can be kept low for the primary mesh because this mesh has
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high-quality bearings on both ends, leading to good axis alignment. In contrast, for the secondary mesh considerable
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margins have to be included if the mesh is driven by a cooling fan motor, as the bearings in such fans are not very
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precise, leading to the chance of axis misalignment that causes several millimeter of deflection at the outer edge of
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the mesh.
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\subsection{Offset labyrinth meshes}
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\begin{figure}[h!]
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chapter-qkd/figures/mesh_ring_reduction.pdf
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chapter-qkd/figures/mesh_ring_reduction.pdf
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chapter-qkd/figures/mesh_ring_reduction.svg
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@ -0,0 +1,89 @@
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