Abstract Details
| Name: Ramya M Anche Affiliation: Indian Institute of Astrophysics Conference ID: ASI2016_498 Title : Mueller Matrices of the Mirrors of the Thirty Meter Telescope (TMT) Authors and Co-Authors : Ramya.M.Anche, G.C.Anupama, K. Sankarasubramanian, Asoke Kumar Sen Indian Institute of Astrophysics, Bangalore, Isro Satellite Center, Bangalore,Assam University, Silchar Abstract Type : Poster Abstract Category : Instrumentation and Techniques Abstract : The estimation of the Mueller matrices for all the three mirrors of the Thirty Meter Telescope (TMT) are presented here. The shapes of the primary, secondary and Nasmyth (M3) mirrors are concave hyperboloid, convex hyperboloid and a plane mirror (elliptical shape) respectively. In the case of primary and secondary mirrors, we have observed that some of the Mueller matrix elements repeat themselves within the azimuth angle (in degrees) 0- 90, 90-180, 180-270, 270-360. In other words, we see four different sectors within the above azimuth angle range, which further shows us no Instrumental Polarization (IP) or cross talk for on-axis rays at the prime focus and cassegrain focus. But after M3, we have observed that the matrix elements are no longer repeating in the four sectors. This is due the Nasmyth (M3) mirror kept at an azimuth angle which is a function of the zenith angle of the telescope, the Instrument Elevation Angle (IEA) and Instrument Bearing Angle (IBA) of the instruments placed on the Nasmyth platform. This work is important in determining the polarization capabilities of the Thirty Meter Telescope. |