Calibration of the EKPol K-corona imaging polarimeter

Luca Zangrilli; Silvano Fineschi; Gerardo Capobianco

doi:10.1117/12.827247

23 September 2009 Calibration of the EKPol K-corona imaging polarimeter

Luca Zangrilli, Silvano Fineschi, Gerardo Capobianco

Proceedings Volume 7438, Solar Physics and Space Weather Instrumentation III; 74380W (2009) https://doi.org/10.1117/12.827247
Event: SPIE Optical Engineering + Applications, 2009, San Diego, California, United States

Abstract

The Dual Rotating Retarder Polarimeter technique has been used for the calibration of the EKPol polarimeter, which is a K-corona imaging instrument based on a Liquid Crystal Variable Retarder (LCVR), and designed to measure the linear polarized radiation coming from the solar corona during total solar eclipses. We put a major emphasis on the EKPol properties at different wavelengths and temperature. In particular, the chromatic dependence of the LCVR rotation prevents from using large band observations, owing to the loss of contrast in the measured modulation curves. This study is also intended as a basis for the design of achromatic LCVRs.

Citation Download Citation

Luca Zangrilli, Silvano Fineschi, and Gerardo Capobianco "Calibration of the EKPol K-corona imaging polarimeter", Proc. SPIE 7438, Solar Physics and Space Weather Instrumentation III, 74380W (23 September 2009); https://doi.org/10.1117/12.827247

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