Optical fiber sensing optical system and optical fiber sensing system

摘要

An object of the present invention is to provide an optical fiber sensing system which can measure highly accurately by preventing the influence of disturbance other than the physical quantity to be measured, in particular, fluctuation of polarized light, at low cost. An optical fiber sensing optical system according to the present invention comprises a light source (5) for outputting search light having a continuous wavelength component, a reflection means (71) for selecting a wavelength component of a part of the continuous wavelength component to generate detection light , 72, 73), the wavelength discriminating means (3) for receiving the detection light and generating transmitted light whose intensity varies according to the change in the wavelength, irreversibly transmitting the search light to the reflection means (1) for transmitting the detection light to an optical system including the wavelength discrimination means, and a detection means for detecting the detection light transmitted to the optical system including the wavelength discrimination means from the first light distribution means A second light distributing means (2) for splitting the light into the light to the wavelength discriminating means and the compensating light, a delay means (4) for generating a time difference between the time of taking out the compensating light and the transmitted light to the outside,