Phase modulated fiber-optic gyroscope for measuring the angular velocity of a moving object

摘要: In a phase-modulated fiber-optic gyroscope having as essential components cable sensor coil portion and provided with phase modulation device, light-emitting device that issues coherent light, beam splitter by which the light issuing from either directly or via an optical fiber is split into two beams are launched at opposite ends of cable, light-receiving have been transmitted through emerge thereof after they re-combined splitter, synchronous detector circuit receives output detects frequency component, improvement wherein further includes DC component output, reflected quantity setting unit presets level H in was edge faces lenses, other parts system did not pass coil, subtracting subtracts present D detector, division performing divides R outputs result division.