Sagnac-type fiber-optic gyroscope

US5118190A · kind A · utility

Assignee

• Messerschmitt Bolkow Blohm GmbH · DE

Inventors

• Peter Jurga · Munich, DE
• Hans Poisel · Leinburg, DE
• Gert Trommer · Munich, DE

Key dates

• Filing date: Aug 9, 1990
• Grant date: Jun 2, 1992
• Expiry date: Aug 9, 2010

Classification

• Technology area (CPC G): Physics
• CPC primary: G01C19/725
• WIPO field: Measurement
• WIPO sector: Instruments

Abstract

A Sagnac-type fiber-optic gyroscope having a light source, a fiber coil consisting of an optical fiber, a receiver arrangement which are all connected with gates of a directional coupler, in which the light fed into the fiber coil interferes with the light emerging from the fiber coil in a coupling area and the rate of rotation of the fiber-optic gyroscope is determined from the interference signals. In order to achieve a working point which is situated in or close to the quadrature point, the directional coupler is developed as a 4.times.4 coupler between the arms of which fixed phase relations are provided in the coupling area.