On the use of Bowen compensators for polarimetry
| Autor: | M. Koschinsky, F. Kneer |
|---|---|
| Rok vydání: | 1996 |
| Předmět: |
Physics
010504 meteorology & atmospheric sciences business.industry Polarimetry General Physics and Astronomy Ellipse Polarization (waves) 01 natural sciences law.invention Crosstalk Telescope polarimeters polarimetric Phase change Optics law 0103 physical sciences business 010303 astronomy & astrophysics 0105 earth and related environmental sciences Polarization ellipse |
| Zdroj: | Astronomy and Astrophysics Supplement Series. 119:171-176 |
| ISSN: | 1286-4846 0365-0138 |
| Popis: | For high precision polarimetry it is very desirable to observe with a telescope that is free of instrumental polarization. Yet it is often inevitable to introduce optical devices which generate crosstalk between the Stokes Q,U components and the V component due to phase retardations upon reflection at mirror surfaces. We show that Bowen compensators are well suited to compensate for these phase changes. They consist of 2 rotatable phase retarder plates, and it can be shown that they act on polarized light either by a rotation of the axes of the polarization ellipse followed by a prescribed, desired phase change or by a phase change followed by rotation of the ellipse. We present applications of Bowen compensators in the Gregory Coudé Telescope at the Observatorio del Teide/Tenerife. peerReviewed |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|