GASP-Galway astronomical Stokes polarimeter
GASP-Galway astronomical Stokes polarimeter
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GASP-戈尔韦天文斯托克斯旋光计
DOI：
10.1051/epjconf/20100505003
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发表时间：
2010
期刊：
影响因子：
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通讯作者：
Andrew Shearer
中科院分区：
文献类型：
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作者：
Gillian Kyne;B. Sheehan;Patrick P. Collins;M. Redfern;Andrew Shearer
高威天文斯托克斯偏振仪（GASP）是一种基于幅度偏振仪的超高速全斯托克斯天文成像偏振仪。它已被开发来解决非常快速的随机（~ms）变化的对象，如光学类星体，磁星和磁激变变量。偏振计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。全斯托克斯矢量的测定所需的时间仅受探测器效率和光子通量的限制。偏振计利用了一个修改后的菲涅耳菱形，作为一个高度消色差的四分之一波片和分束器（称为RBS）。我们介绍了DOAP的工作原理，一些旋光计的光学设计。定标是所有旋光仪的重要而困难的问题，特别是在天文旋光仪中。我们给出了一个适当的这种类型的旋光仪的校准技术的描述。
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 (~ms) variations in objects such as optical pulsars, magnetars and magnetic cataclysmic variables. The polarimeter has no moving parts or modulated components so the complete Stokes vector can be measured from just one exposure - making it unique to astronomy. The time required for the determination of the full Stokes vector is limited only by detector efficiency and photon fluxes. The polarimeter utilizes a modified Fresnel rhomb that acts as a highly achromatic quarter wave plate and a beamsplitter (referred to as an RBS). We present a description of how the DOAP works, some of the optical design for the polarimeter. 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.