公开(公告)号：JPH10318761A

公开(公告)日：1998-12-04

申请号：JP12434098

申请日：1998-05-07

Applicant: LITTON SYSTEMS INC

Inventor： AUERBACH DANIEL E ,  CORDOVA AMADO ,  GOLDNER ERIC L ,  HIGBEE JOHN E ,  STEELE JAMES R ,  WONG KA KHA

IPC: G01P9/00 ,  G01C19/72

Abstract: PROBLEM TO BE SOLVED: To avoid the influence of an intensity spike by dividing light energy output into a plurality of light beams and emitting them into a fiber, propagating them inversely within a coil, adding a periodical artificial phase difference, and recombining a single light output signal. SOLUTION: A light energy source 16 passes through an optical fiber 18, advances toward a coupler 20 and a polarizer 22, and emits a light energy with a predetermined wavelength and bandwidth. Then, a coupler 24 receives the output of the polarizer 22 and divides it into a pair of waves that are reversely propagated in the coil 26 of the optical fiber. A phase modulator 28 is located in an optical path between the coupler 24 and the optical fiber sensor coil 26 and gives a periodical, artificial phase difference between light waves that are reversely propagated in the coil 26. Modulated, reverse propagation waves are coupled so that they interfere each other by the coupler 24. Before the application to a photodetector 32, a light signal is operated, the intensity of the light signal is periodically attenuated, and an intensity spike is eliminated before converting to the information of electrical regions from light.

公开(公告)号：CA2235896A1

公开(公告)日：1998-11-12

申请号：CA2235896

申请日：1998-04-27

Applicant: LITTON SYSTEMS INC

Inventor： CORDOVA AMADO ,  STEELE JAMES R ,  GOLDNER ERIC L ,  HIGBEE JOHN E ,  AUERBACH DANIEL E ,  WONG KA KHA

IPC: G01P9/00 ,  G01C19/72

Abstract: An interferometric rotation rate sensor is arranged to overcome effects of the unavoidable generation of intensity spikes in the modulated optical output. An electrooptical device is located within the optical path of the sensor for receiving the optical output signal from the sensor coil and transforming it prior to application to the photodetector. The electrooptical device is driven by a periodic electrical signal with a period equal to the loop transit time of light traveling through the sensor coil. By synchronizing the periods of attenuation with the predictable presence of spikes in the optical output, valid optical signal information is preserved while gyro electronics are sheltered from the results of optical intensity spiking.