|Spectral-Modulation-Based Polarization Calibration of
the AIMS Telescope
|526, Solar Polarization Workshop 8
|Hou, J. F.
|We describe a novel method for the polarization calibration of the
Accurate Infrared Magnetic field Measurements of the Sun (AIMS) telescope.
A pair of thick multi-order retarders are incorporated into the
polarization calibration unit (PCU).
The measured intensity spectrum is composed of quasi-cosinusoidal,
wave-number components carrying information about the instrumental
polarization of the telescope.
Fourier inversion of this “channeled” intensity spectrum determines the
instrumental polarization of the telescope.
No moving mechanisms or modulated optical components are used for the PCU,
and all the instrumental polarization parameters can be determined at once
from a single spectrum.
Effectiveness and limits of this method are discussed for the mid-infrared