A High-Efficiency and High-Accuracy Polarimeter for Solar Magnetic Field Measurements

摘要: Solar activity is dominated by the magnetic field. Nowadays, a polarimeter mandatory tool to measure solar fields, which are generally faint and correspond polarization of an order $10^{-2}$ – $10^{-4}$ . As such, measurements high efficiency with accuracy crucial investigate fields. Here we propose high-efficiency high-accuracy polarimeter, based on pair nematic liquid crystal variable retarders (LCVRs) Wollaston prism (WP). It uses dedicated Stokes modulation strategy achieve efficiency. A calibration unit (CU) developed response matrix, provides high-precision correct possible systematic errors. Compared other traditional polarimeters, scheme our flexible. In addition be able all three components ( $Q$ , $U$ , or $V$ ) simultaneously, it can also one two these alone, Dedicated alignment techniques optimized for measurement achieved. laboratory experimental test, two-image delivers overall $10^{-4}$ , about 10 times better, compared previous polarimeters that use four-image modulation. This work new option future synoptic observations.