公开(公告)号：AU2013285419A1

公开(公告)日：2015-01-22

申请号：AU2013285419

申请日：2013-07-04

Applicant: ABB RESEARCH LTD

Inventor： MULLER GEORG ,  FRANK ANDREAS ,  BOHNERT KLAUS ,  GU XUN

IPC: G01R15/24 ,  G01R19/32

Abstract: In a fiber-optic current sensor, a 22.5° Faraday rotator,which is part of the sensing fiber coil,determines the working point of the sensor. The coil is operated with substantially linearly polarized light or incoherent substantially left and right circularly polarized light waves. In one arrangement, a polarization beam splitter generates two optical signals that vary in anti-phase with changing current. A signal processor determines the current from the two anti-phase signals. Appropriately detuned and oriented fiber-optic half-wave or quarter-wave retarders before the fiber coil are used to reduce or cancel the adverse effects of temperature and bend-induced birefringence on the measurement signal. Moreover, the temperature may be derived from the difference in the bias of the anti-phase signals and may be used to cancel temperature effects in the signal processor.

公开(公告)号：DE112013006884T5

公开(公告)日：2015-12-17

申请号：DE112013006884

申请日：2013-03-28

Applicant: ABB RESEARCH LTD

Inventor： MÜLLER GEORG ,  BOHNERT KLAUS ,  FRANK ANDREAS ,  GU XUN

IPC: G01R15/24 ,  G01R33/032

Abstract: Ein faseroptischer Stromsensor verwendet eine stark doppelbrechende gesponnene Faser (17) als Messfaser (17). Das Licht wird durch einen Verzögerer (16) geleitet, der ein verstimmter Viertelwellen- oder Halbwellenverzögerer (16) ist. Es wird gezeigt, dass eine solche Verstimmung verwendet werden kann, um Temperaturabhängigkeiten des Messkopfes auszugleichen.