The local state of polarization of a light wave field is determined by measuring the radiation transmitted by one or several polarizers with three different azimuth angles. A modified TV camera is used having its usually provided tri-color filters replaced by polarization filters whose azimuth angles...http://www.google.de/patents/US4516855?utm_source=gb-gplus-sharePatent US4516855 - Method and apparatus for determining the polarization state of a light wave field
