Description

The Intensity Spread Function can be shown in four different angle spaces. Only the first option, Show in Angle Space, shows the intensity as Power/steradian.  In the other cases, the solid angle has been mapped to a different angle space, so the intensity is shown as power over a solid angle unit other than steradians, [sr].  In all four cases, the total integrated power is the same and is given by the summation of each pixel's intensity multiplied by its solid angle.

Navigation

 This feature can be accessed by right mouse clicking in the main spreadsheet function chart and selecting "Show in ... Space" from the list menu.

Show in Angle Space

The Angle Space conversion converts versus q_x and q_y, where q_x² + q_y² = q_R²  and a = q_x * sin( q_R) / q_R   and b = q_y * sin( q_R ) / q_R.

Show in Direction Cosine Space

The Direction Cosine Space plots the intensity versus the a and b direction cosines, where a² + b² + g² = 1.

Show in Direction Cosine Angle Space

The Direction Cosine Angle space versus F_x and  F_y  , where F_x =  arcsin( a )  and  F_y =  arcsin( b ).

Show in Direction Tangent Angle Space

The Direction Cosine Angle space versus F_x and  F_y  , where F_x = arctan( a )  and  F_y = arctan( b ).