GASP -高威天文斯托克斯偏振计
GASP - Galway Astronomical Stokes Polarimeter
摘要：
戈尔韦天文斯托克斯偏振计（GASP）是一种基于幅度偏振计的超高速全斯托克斯天文成像偏振计。它已被开发来解决非常快速的随机，毫秒级的变化，如光学望远镜，RRAT和磁激变变量的对象。GASP没有移动部件或调制组件，因此只需一次曝光就可以测量完整的斯托克斯矢量-使其成为天文学的独特之处。此外，确定全斯托克斯矢量所需的时间仅受所用探测器的时间分辨率和入射光子通量的限制。GASP利用修改的菲涅耳菱形，其充当高度消色差的四分之一波片和分束器（称为RBS）。在这里，我们介绍了如何DOAP的工作原理，偏振计的一些光学设计，并给出一些初步的结果。校准是所有偏振计都要面对的一个重要而困难的问题，尤其是在天文偏振计中。本文介绍了适用于这类偏振计的定标技术，特别是Compain & Drevillon的本征值定标法
英文摘要：
The Galway Astronomical Stokes Polarimeter (GASP) is an ultra-high-speed, full Stokes, astronomical imaging polarimeter based upon a Division of Amplitude Polarimeter. It has been developed to resolve extremely rapid stochastic, millisecond variations in objects such as optical pulsars, RRATs and magnetic cataclysmic variables. GASP has no moving parts or modulated components, so the complete Stokes vector can be measured from just one exposure - making it unique to astronomy. Furthermore the time required for the determination of the full Stokes vector is limited only by the time resolution of the detectors used and the incident photon fluxes. GASP utilizes a modified Fresnel rhomb, which acts as a highly achromatic quarter wave plate and a beamsplitter (referred to as an RBS). Here we present a description of how the DOAP works, some of the optical designs for the polarimeter, and give some preliminary results. Calibration is an important, and difficult issue with all polarimeters, but particularly in astronomical polarimeters. We give a description of calibration techniques appropriate to this type of polarimeter, particularly the Eigenvalue Calibration Method of Compain & Drevillon
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