公开(公告)号：NO983248D0

公开(公告)日：1998-07-14

申请号：NO983248

申请日：1998-07-14

Applicant: LITTON SYSTEMS INC

Inventor： FERSHT SAMUEL N

IPC: G01L1/24 ,  G01B9/02 ,  G01D5/353 ,  G01J9/02 ,  G01K11/12 ,  G01B ,  G01K ,  G01L

公开(公告)号：NO860782L

公开(公告)日：1986-03-03

申请号：NO860782

申请日：1986-03-03

Applicant: LITTON SYSTEMS INC

Inventor： FERSHT SAMUEL N ,  FERSHT RENA S

IPC: G01C19/64 ,  G01C19/70 ,  G01P9/00 ,  H01S3/083 ,  G01C

公开(公告)号：IT8547612D0

公开(公告)日：1985-01-29

申请号：IT4761285

申请日：1985-01-29

Applicant: LITTON SYSTEMS INC

Inventor： FERSHT RENA S ,  FERSHT SAMUEL N

IPC: G01P9/00 ,  G01C19/64 ,  G01C19/66 ,  G01C19/70 ,  H01S3/083 ,  G01P

公开(公告)号：EP0876582A4

公开(公告)日：2001-01-31

申请号：EP97949460

申请日：1997-11-14

Applicant: LITTON SYSTEMS INC

Inventor： FERSHT SAMUEL N ,  FREDERICK DONALD A

IPC: G01L1/24 ,  G01B9/02 ,  G01D5/353 ,  G01J9/02 ,  G01K11/12

CPC classification number: G01D5/35383

Abstract: The invention is a method and apparatus for determining the phase difference of light waves (31) after propagating through each of one or more two-path pairs, a two-path pair being two optical transmission paths connecting a common entry point (25) to a common exit point (29). Coherent light pulses (27) of predetermined duration are fed into the entry point (25) of each two-path pair in a group of two-path pairs at predetermined time intervals, the pulse duration being subdivided into a plurality of predetermined time segments. The phase difference for each two-path pair is determined from amplitude values of the electrical signal.

公开(公告)号：EP0190260A4

公开(公告)日：1987-01-10

申请号：EP85903922

申请日：1985-07-23

Applicant: LITTON SYSTEMS INC

Inventor： FERSHT RENA S ,  FERSHT SAMUEL N

IPC: G01C19/64 ,  G01C19/70 ,  G01P9/00 ,  H01S3/083

CPC classification number: G01C19/70

Abstract: Three sets of laser angular sensors (14, 15, 16) corresponding to three angularly disposed sensing planes (11, 12, 13) are mounted on a common instrument block (10) and each provided with mechanical dithering devices (14a, 15a, 16a) for inducing an oscillatory mechanical motion to substantially cancel lock-in. A compensating mass (21) is mounted on the same instrument block (10) and indicates a selective controllable mechanical dithering device (21a). Dithering the compensating mass at an appropriately selected amplitude, frequency, and phase automatically compensates for dither interaction (coning) between the three sensors (14, 15, 16).