| 摘要 |
<p>A ray of light from a light source (11) passes through a light branching device (25) having a branching ratio of 1:4 and further through a polarizer (13) and is incident into another light branching device (14). Two branched rays of light from the branching device (14) pass through phase modulators (15, 26) at both ends of an optical fiber coil (16) and are incident as right-turn light and left-turn light, respectively. The ray of light is phase-modulated by a modulating signal phi (2 tau fmt) in the phase modulator (15) and another ray of light is phase-modulated by a modulating signal phi (2 pi fmt - 2 pi tau fm) (where tau : propagation time of the optical fiber coil (16)) in the phase modulator (26). Both rays of light passing through the optical fiber coil (16) enter the light branching device (14) and interfere with each other, and the interference ray of light is supplied to an analyzer (21) through the branching device (25). The output of the analyzer (21) is subjected to synchronous detection by the modulating signal. Therefore, the angular velocity applied around the axis of the optical fiber coil (16) is detected. The frequency fm component is removed from the intensity-modulated component occuring in the phase modulators (15, 26), the error of a bias value of the optical interference angular velocity meter is eliminated, and zero-point stability of the bias can be improved. <IMAGE></p> |
