| 摘要 |
PURPOSE:To obtain a small-sized, high-sensitivity optical fiber gyroscope by using a polarization plane maintaining optical fiber for an optical fiber loop as a rotation detection part and using a normal single-mode optical fiber for other optical paths and optical parts. CONSTITUTION:Rays of light from a semiconductor laser 1 as a light source are passed through the single-mode optical fiber 2 and split into two by an optical fiber coupler 4a, and only one rays of light are incident on a polarizer 5. The rays light become linear beams of polarized light of single polarization, which is split into two by an optical fiber coupler 12 without changing in polarization state and those beams are made incident on the optical fiber loop 13 composed of the polarization maintaining optical fiber through connectors 14a and 14b coupled so that the optical axis of the polarization plane maintaining optical fiber constituting the optical fiber loop 13 is aligned with the optical wav of the beams of linear polarized light wave propagated in the optical fiber coupler 12. The rays of light being made incident on the optical fiber loop 13 clockwise and counterclockwise have a mutuallyh phase shift owing to the rotation of the system and are guided to a photodetector 8 through a polarizer 5, so that the intensity of the interference light is measured. |
