| 摘要 |
<p>Clockwise and counterclockwise light beams, which have a Sagnac phase difference caused by an angular rate in an optical fiber coil (15), are combined into interference light, which is converted by a photodetector (17) into an electrical signal (Vp). A sine component and a cosine component of the Sagnac phase difference DELTA PHI s in the output of the photodetector are detected by first and second synchronous detectors (18,25), respectively, and the sine component is used as the fiber optic gyro output and it is provided to a correcting signal generator (27) to produce a correcting signal (Vc). The detected cosine component is added by an adder (29) to the correcting signal, and the added output is compared by a differential amplifier (31) with a reference voltage (VR) and the resulting error signal (Ve) is produced. The error signal is applied to an integrating filter (33), the output of which is used to control the quantity of light to be emitted from a light source (11) or the gain of the photodetector output, forming a feedback loop so that the error signal is reduced to zero. <IMAGE></p> |
