| 摘要 |
An object is to provide an inexpensive optical fiber sensing system capable of performing measurement at a higher accuracy by preventing influence of external disturbance other than a physical quantity of a measurement object, particularly, variation of polarization. An optical fiber sensing optical system according to the present invention is configured to include a light source (5) which outputs search light having continuous wavelength components, a reflecting unit (71, 72, 73) which selects a portion of wavelength components among the continuous wavelength components to generate detection light, a wavelength discriminating unit (3) which the detection light is incident on and which generates transmitted light of which intensity is changed according to a change in wavelength thereof, a first light distributing unit (1) which irreversibly transmits the search light to the reflecting unit and transmits the detection light to an optical system including the wavelength discriminating unit, a second light distributing unit (2) which further divides the detection light transmitted from the first light distributing unit to the optical system including the wavelength discriminating unit into light to the wavelength discriminating unit and compensating light, and a delay unit (4) which generates a time difference between time points of extraction of the compensating light and the transmitted light to an outside. |
