| 摘要 |
The present invention addresses the problem of inexpensively providing an optical fiber sensing system capable of carrying out highly accurate measurement by preventing the influence of noise other than the physical quantity to be measured, especially polarization variation. An optical fiber sensing optical system according to the present invention is provided with a light source (5) for outputting probe light having continuous wavelength components, reflection means (71, 72, 73) for selecting a portion of the wavelength components of the continuous wavelength components and generating detection light, a wavelength discrimination means (3) that the detection light is irradiated onto and generates transmitted light having an intensity that varies according to the variation of the wavelength of the detection light, a first light distribution means (1) for irreversibly transmitting the probe light to the reflection means and transmitting the detection light to an optical system including the wavelength discrimination means, a second light distribution means (2) for further splitting the detection light transmitted from the first light distribution means to the optical system including the wavelength discrimination means into light to be transmitted to the wavelength discrimination means and compensation light, and a delay means (4) for generating a time difference between the times when the compensation light and transmitted light are emitted to the outside. |
