| 摘要 |
PURPOSE:To improve the linearity of the output, by inserting a phase modulator between an optical path and a light distributor, receiving the interference light of clockwise light and counterclockwise light, detecting the phase difference, and using the sine or cosine component as the gyroscope output in correspondence with the phase difference. CONSTITUTION:Light 12 from a light source 11 is distributed to clockwise light 14 and counterclockwise light 15 by a light distributor 13 and inputted to both ends of an optical path 16. Output light beams 17 and 18 are interfered by an light coupler 13. A phase modulator 22 is inserted between the light distributor coupler 13 and one end of the optical path 19. The interference light is detected by a light receiver 21 and supplied to synchronous detectors 24 and 27 having the same frequencies as the driving frequencies f0 and 2f0 of the modulator 22. The output voltage, which is outputted to a gyroscope output terminal 46 is compared with a reference voltage. When the phase difference is within the range of about + or -pi/4 with respect to + or -mx, the sine component outputted from a terminal 34 is guided to the terminal 46. When the phase difference is within the range of about + or -pi/4 with respect to + or -(2m+1)pi/2, the cosine component of a terminal 43 is guided to the terminal 46. The output has the excellent linearily over the entire range. |
