Abstract Details
| Name: Shashikiran Ganesh Affiliation: Physical Research Laboratory Conference ID: ASI2015_584 Title : EMCCD based Imaging polarimeter for 1.2m Mt Abu telescope. Authors and Co-Authors : Shashikiran Ganesh (PRL), Ashish Mishra (PRL/IIST), S N Mathur(PRL), K S Baliyan( PRL), Sunil Chandra (PRL), Kumar Venkataramani (PRL), Navpreet Kaur (PRL) Abstract Type : Oral Abstract Category : Instrumentation and Techniques Abstract : A new imaging polarimeter has been designed and built at PRL for carrying out optical band imaging polarimetric observations at the 1.2m telescope of the Mount Abu Infrared Observatory. A half-wave plate rotating at known frequency is used as a modulator and a Foster prism is used as an analyser for measuring the polarization. A 1K x 1K EMCCD is used as detector. The second beam (partially polarized output from the foster prism) is used for auto-guiding. Modulation can be carried out in both rapid as well as slow modes. The rapid modulation technique is used for point source studies - e.g. monitoring of blazars for variability in polarization and intensity. Slow modulation technique (used with or without any on-chip-binning) is used for observing extended sources such as comets where spatial resolution is also important. The instrument has a 12 position filter wheel equipped with the Johnson/Cousins broad band and the Hale-Bopp (Comet filters) narrow band sets. The instrument has been tested in the lab (for 100% polarization using a glan prism) and also at the telescope. We shall describe the instrument and present some of the results obtained. |