公开(公告)号：WO1992000501A1

公开(公告)日：1992-01-09

申请号：PCT/US1991004108

申请日：1991-06-11

Applicant: UNITED TECHNOLOGIES CORPORATION

Inventor： UNITED TECHNOLOGIES CORPORATION ,  FERRAR, Carl, M. ,  BAILEY, Timothy, J. ,  COURTNEY, Daniel, P.

IPC: G01C19/72

CPC classification number: G01C19/726

Abstract: In a fiber optic rotation sensor, two phase modulators are symmetrically offset with respect to the center of an optical fiber loop and alternately excited by a waveform whose frequency alters the differential phase between counter-propagating light waves in the loop to maintain a fixed intensity signal at a detector upon loop rotation. The difference between the waveform frequencies is proportional to the speed of sensor rotation while the mean value of the waveform frequencies equals the frequency value in the absence of sensor rotation. In the alternative, a single modulator is excited by a waveform whose polarity is reversed at intervals of time.