| 摘要 |
Light is supplied as clockwise and counterclockwise light beams to both ends of an optical fiber coil, the clockwise and counterclockwise light beams having propagated through the optical fiber coil interfere with each other, and the interference light is converted by a photodetector into an electrical signal. The both light beams are phase modulated by a phase modulator and the phase modulation frequency component is synchronously detected by a synchronous detector, from which a signal corresponding to an input angular rate is output. A reference signal generator generates a first reference signal and a second reference signal. A change-over switch responds to a diagnosis instruction signal to selectively either one of the first and second reference signals to the synchronous detector. The synchronously detected output obtained with the second reference signal is output as a self-diagnosis signal, and a diagnosis circuit makes a diagnosis by making a check to see if the level or frequency of the self-diagnosis signal is within a predetermined range. <IMAGE> |
