Noun
The art or process of measuring the polarization of light.
Source: Webster's dictionaryOne parameterization of the elliptical figure specifies the orientation angle ψ, defined as the angle between the major axis of the ellipse and the x-axis M. A. Sletten and D. J. McLaughlin, "Radar polarimetry", in K. Chang (ed. Source: Internet
The same convention is also used, although with some few exceptions, by optical astronomers working in the field of polarimetry. Source: Internet