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Description
The QCon Surface type is a straightforward implementation of the Forbes QCon type polynomial asphere with the sag equation shown below.
In the sag equation above:
C = base surface curvature (1/Radius)
k = conic constant
r2 = x2 + y2
U = r/rmax, with rmax being the maximum surface semi-aperture
Cm = Forbes QCon (strong type) coefficients
Qm = Orthogonal QCon polynomial terms
References:
“Shape specification for axially symmetric optical surfaces”, G.W. Forbes, OPTICS EXPRESS 5218, 16 Apr 2007, Vol. 15, No. 8
“Robust and fast computation for the polynomials of optics”, G.W. Forbes, OPTICS EXPRESS 13851, 7 June 2013, Vol. 18, No. 13
“Robust, efficient computational methods for axially symmetric optical aspheres”, G.W. Forbes, OPTICS EXPRESS 19700, 13 September 2010, Vol. 18, No. 19
Navigation
This feature can be accessed by selecting Qcon Surface (Conic surface deformed by Forbes Qcon polynomials) as the surface type on the Surface tab of a surface dialog box.
Controls
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Control
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Inputs / Description
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Defaults
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Logical Parent
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Name of Parent entity.
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Custom Element Name
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Name
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Name of surface supplied by user.
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Surf n
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Description
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Description of the surface.
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Traceable
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Surface can be raytraced.
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Checked
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Use for trimming only
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Never raytrace. Surface used for trimming only.
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Unchecked
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Type
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Surface type. Select Qcon Surface (Conic surface deformed by Forbes Qcon polynomials)
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Plane
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Surface Settings
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Rad
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Base surface radius of curvature (or base surface curvature, depending on preference settings)
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0
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Conic
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Conic constant.
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0
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Norm
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Normalization radius.
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1
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0, 1, 2, 3...
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Coefficients of the QCon polynomial terms. Note that a new coefficient row is not added until a number is entered in the previous row.
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0
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OK
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Accept settings and close dialog box.
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Cancel
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Discard settings and close dialog box.
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Apply
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Accept settings and keep dialog box open.
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Help
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Access this Help page.
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Related Topics
Surface types summary
Create a new surface
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