Title:
【発明の名称】サニャック型光ファィバー干渉計
Document Type and Number:
Japanese Patent JP2554525
Kind Code:
B2
Abstract:
The optical fiber interferometer system is used either in a gyroscope or else for measuring electrical current by the Faraday effect. It includes an optical board (100) which is connected to the two ends of a monomode optical fiber (200) constituting an interferometer ring, said optical board including a photodetector (103) which is colinear with the light source which is coupled by both its front and its rear faces. The two counter-propagating beams travelling round the interferometer ring have their relative phase difference modulated by phase modulation and their light power modulated by amplitude modulation. An electronics board (300) generates these modulations and, from the photodetector signal (103), it extracts a component at the lower beat frequency between said two modulation frequencies, thereby making it possible to measure the relative phase difference between the two beams.
Inventors:
JANNPIEERU DEYUPURA
Application Number:
JP14274488A
Publication Date:
November 13, 1996
Filing Date:
June 09, 1988
Export Citation:
Assignee:
ALSTHOM ATLANTIQUE
International Classes:
G01C19/64; G01C19/72; G01R15/24; (IPC1-7): G01C19/72
Attorney, Agent or Firm:
Yoshio Kawaguchi (2 outside)