公开(公告)号：DE69406185T2

公开(公告)日：1998-02-12

申请号：DE69406185

申请日：1994-04-06

Applicant: LITTON SYSTEMS INC

Inventor： PATTERSON RALPH A ,  WILDE JOHN D

IPC: G01C19/72 ,  G02B6/00

公开(公告)号：CA2172730A1

公开(公告)日：1996-02-08

申请号：CA2172730

申请日：1995-07-26

Applicant: LITTON SYSTEMS INC

Inventor： PAVLATH GEORGE A ,  MICHAL RONALD J ,  PATTERSON RALPH A ,  HUANG SIDNEY XI-YI

IPC: G01C19/72 ,  G01R33/032

Abstract: A fiber optic sensing coil formed in a polarization-maintaining optical fiber has two optical fiber leads extending therefrom. A multifunction integrated optics chip linearly polarizes optical signals input to the sensing coil. Fiber optic leads formed of polarization-maintaining optical fiber extend from the multifunction integrated optics chip. The fiber optic multifunction integrated optics chip leads are arranged such that the linear polarization of optical signals output from the multifunction integrated optics chip is directed along one of the principal axes of birefringence of each of the fiber optic multifunction integrated optics chip leads. Splices are formed between corresponding the first sensing coil leads and the multifunction integrated optics chip leads. The sensing coil leads and the multifunction integrated optics chip leads are arranged such that their corresponding principal axes of birefringence are at angles of approximately 45~ relative to one another. The first splice is formed a distance from the multifunction integrated optics chip such that a selected phase change between polarization components occurs in optical waves that propagate the distance L1 in the first multifunction integrated optics chip lead.

公开(公告)号：CA2105616A1

公开(公告)日：1994-08-13

申请号：CA2105616

申请日：1993-09-07

Applicant: LITTON SYSTEMS INC

Inventor： HUANG SIDNEY X ,  MICHAL RONALD J ,  PATTERSON RALPH A ,  PAVLATH GEORGE A

IPC: G01C19/72 ,  G02B6/00

Abstract: Apparatus for suppressing the bias errors induced by the Faraday effect in the output of a sensor coil exposed to a magnetic field. Arrangements are formed at two leads of the sensor coil for compensating the bias shifts. One of such arrangements comprises at least one loop of optical fiber for compensating the effect induced by the magnetic field component oriented transverse to the axis of the sensor coil while the other comprises at least one loop oriented at a predetermined pitch angle for compensating the effect induced by a magnetic field component along the axis. In each case, a predetermined degree of twist of a preselected fiber twist mode is imposed upon the compensator loop for creating a counteracting, corrective Faraday effect. Cross-coupling does not occur between the two compensators as their twist rate perodicities are unequal.