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Click Add.
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Click
 Study. |
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Click
 Done. |
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Browse to the model’s Application Libraries folder and double-click the file keck_telescope_parameters.txt. This text file contains the prescription for the telescope (including the segmented mirror geometry) as well as study parameters.
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Find the Mesh frame coordinates subsection. From the Geometry shape function list, choose Quartic Lagrange. The ray tracing algorithm used by the Geometrical Optics interface computes the refracted ray direction based on a discretized geometry via the underlying finite element mesh. A quartic geometry shape order will reduce the discretization error compared to the default, which uses linear and quadratic polynomials.
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In the Part Libraries window, select Ray Optics Module>3D>Mirrors>conic_polygonal_mirror_off_axis_3d in the tree.
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In the Select Part Variant dialog box, select Specify clear aperture diameter and off axis distance in the Select part variant list.
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Click OK.
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In the Model Builder window, under Component 1 (comp1)>Geometry 1 click Conic Polygonal Mirror Off Axis 3D 1 (pi1).
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Locate the Position and Orientation of Output section. Find the Rotation subsection. In the Rotation angle text field, type rho1.
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Click OK. This selection, and those that follow will be used later in the model setup.
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Click OK.
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Locate the Position and Orientation of Output section. Find the Rotation subsection. In the Rotation angle text field, type rho2.
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Locate the Position and Orientation of Output section. Find the Rotation subsection. In the Rotation angle text field, type rho3.
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Locate the Position and Orientation of Output section. Find the Rotation subsection. In the Rotation angle text field, type rho4.
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Locate the Position and Orientation of Output section. Find the Rotation subsection. In the Rotation angle text field, type rho5.
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Locate the Position and Orientation of Output section. Find the Rotation subsection. In the Rotation angle text field, type rho6.
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Click in the Graphics window and then press Ctrl+A to select all objects.
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In the Part Libraries window, select Ray Optics Module>3D>Mirrors>conic_mirror_on_axis_3d in the tree.
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In the Select Part Variant dialog box, select Specify clear aperture diameter in the Select part variant list.
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Click OK.
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In the Model Builder window, under Component 1 (comp1)>Geometry 1 click Conic Mirror On Axis 3D 1 (pi7).
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Locate the Position and Orientation of Output section. Find the Coordinate system to match subsection. From the Take work plane from list, choose Primary Mirror 1 (pi1).
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In the Part Libraries window, select Ray Optics Module>3D>Mirrors>elliptical_planar_mirror_3d in the tree.
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In the Select Part Variant dialog box, select Specify mirror angle and minor axis diameter in the Select part variant list.
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Click OK.
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In the Model Builder window, under Component 1 (comp1)>Geometry 1 click Elliptical Planar Mirror 3D 1 (pi8).
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Locate the Position and Orientation of Output section. Find the Coordinate system to match subsection. From the Take work plane from list, choose Primary Mirror 1 (pi1).
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Locate the Parameters section. Find the First parameter subsection. In the Minimum text field, type -d_img/2.
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In the z text field, type C_img*(s1^2 + s2^2)/(1 + sqrt(1 - C_img^2*(s1^2 + s2^2)))*1[m]. This is the equation of a sphere having a curvature C_img. This is the curvature defined in the Parameters node.
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Locate the Coordinate System section. From the Take work plane from list, choose Tertiary Mirror (pi8).
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Locate the Selections of Resulting Entities section. Select the Resulting objects selection check box.
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Click
 Clear Selection. Only mirrors are being used in this model. Clearing the domain selection allows the model to be run without adding materials. |
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Locate the Ray Release and Propagation section. In the Maximum number of secondary rays text field, type 0. Stray light is not being traced, so reflected rays will not be produced at the lens surfaces.
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Select the Use geometry normals for ray-boundary interactions check box. In this simulation, the geometry normals are used to apply the boundary conditions on all refracting surfaces. This is appropriate for the highest accuracy ray traces in single-physics simulations, where the geometry is not deformed.
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Locate the Boundary Selection section. From the Selection list, choose Mirrors. This is the cumulative selection defined above.
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Locate the Wall Condition section. From the Wall condition list, choose Disappear. Rays that hit any of these surfaces will be removed.
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Locate the Boundary Selection section. From the Selection list, choose Image Surface. The default wall condition Freeze will be applied to rays that reach the image surface.
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Right-click Ray Termination 1 and choose Build All. The default Physics-controlled mesh is sufficient for this simulation.
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In the Lengths text field, type 0 60. This path length is sufficient to ensure that all rays reach the image plane.
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In the Model Builder window, expand the Results>Ray Diagram>Ray Trajectories 1 node, then click Color Expression 1.
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In the Expression text field, type at('last',gop.rrel). This is the radial coordinate relative to the centroid at the image plane for each release feature.
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In the Spot Diagram toolbar, click
 More Plots and choose Spot Diagram. Make some adjustments to the default Spot Diagram in order to show the spot size and coordinates on the curved image surface. |
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In the Expression text field, type at(0,gop.rrel). This is the radial coordinate relative to the centroid at the entrance pupil for each ray release.
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field of view)
)
)
- 30°
