公开(公告)号：US11143678B2

公开(公告)日：2021-10-12

申请号：US16954451

申请日：2017-12-22

Applicant: ABB POWER GRIDS SWITZERLAND AG

Inventor： Klaus Bohnert ,  Andreas Frank ,  Georg Muller ,  Lin Yang

IPC: G01R15/24 ,  G01R33/032

Abstract: In order to carry out the polarimetric detection of a measurand, light of two polarization states is passed through a sensing element, where the two states suffer a differential phase shift depending on the value of the measurand. In order to compensate for only imperfections of the device, a method is proposed that is based on calibration values obtained in a low-value regime of the measurand only. Yet the method can still be used for accurately determining higher values of the measurand.