Create Calibration files

There are two calibration files that are needed including the instrumental position angle and efficiency calibration file. These are currently stored in polcal files in the data/ directory. The files currently have the format of wavelength, half wave plate efficiency, position angle, quarter wave plate efficiency.

Efficiency

Efficiency measurements are made by making observations with a lamp and can be done during the day. The block describing the red and blue efficiency observations are available in 2015-2-COM-001. These tests only need to be run when major changes are made to the wave plates.

Position Angle

Position angle zeropoints are measured by observing a known, non-variable polarized standard and correcting the observed position angle to the known value.