A CIRCLE integral integrates the reflectance into a right circular cone centered on a specified direction, having a specified half angle and polarization sensitivity. The polarization sensitivity applies to the center of the aperture. The polarization sensitivity at other points in the aperture is rotated in a manner appropriate for a paraxial optical element. The dialog box that opens when the user selects a CIRCLE integral is shown below:
All of the angles must be specified in radians. By default, the variable “deg” is defined to enable one to convert a value in degrees to one in radians. Thus, “45*deg” is p/4 radians.
Notice that, by default, the variable incidentpol is used as the incident polarization. Any other Stokes vector may be substituted for incidentpol. The polarization sensitivity should be set to a four-element Stokes vector.
The following shows the integration area for a CIRCLE integral with a center polar angle of 45°, an azimuthal angle of 90°, and a half-angle of 25°:
The plane of incidence is the horizontal diameter across the circle.
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Latest MIST Version: 4.10 (October 2017)