Absolute CTR structure factor and reflectivity - #87
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…factor scale BREAKING CHANGE: F2_hkl changes in both integration modes. Rocking scans gain the per-frame exposure/monitor normalization, the rocking integral in radian, and division by the out-of-plane acceptance; both modes divide the detector solid-angle correction back out of F2_hkl, which still scales the intensity. Rods integrated with an earlier version are on a different scale and must be re-integrated before being combined with new ones.
BREAKING CHANGE: intensities and F2_hkl change for scans that drive the detector arm, and only those. The per-pixel polarization array is built at the calibrated arm position, which understated the correction by 3 % at a scattering angle of 10 degrees, 10 % at 18 and 33 % at 30; both integration paths now apply a per-frame factor that moves it onto the arm position each frame was measured at. A fixed-arm scan is bit-identical. The reciprocal-space reconstruction applies the polarization per pixel and is unchanged.
BREAKING CHANGE: integration_corrections is now a group of typed datasets instead of a single json string. The json dataset is still read, but no longer written, so post-processing that parses it will not see new files.
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Adds absolute structure factor and reflectivity calculation
According to #15
Reflectivity should be 1 below critical angle if everything is set correctly.
This requires exact knowledge of the sample size, beam size/shape and total flux hitting the sample.
Fixes
The solid angle correction was incorrect before. I used the default pixel-based solid angle correction. This is correct for determination of scattering cross-sections of broad scattering features or to correct the image to a correct scale.
However, for CTRs with wide-open detector slits (not truncated signal)
Also addresses partially:
#79