Optical fiber sensor using Brillouin scattering based on current modulation

摘要

It provides a distributed optical fiber sensor using the Brillouin scattering that can simplify the configuration and reduce the manufacturing cost. Using the current modulation-based Brillouin scattering according to one embodiment of the invention the distribution type optical fiber sensor, according to the time zone the first frequency and the waveform that generates a current modulation waveform that generates light having any one frequency of the second frequency generator; A light source that generates light having any one of the frequency of the first frequency and the second frequency modulation according to the current waveform of the waveform generator; If the incident light from the light source in a first frequency pump portion for generating a pump beam pulse; Including an optical fiber for the time delay to the delay path of the light incident from the light source, the probe portion consisting of a light having a second frequency to function as a probe light; And a probe portion and the pump portion is associated with the optical fiber for measurement is connected, the detector for detecting Brillouin scattered signal between the probe light and the pump pulse in the measuring optical fiber; characterized by including the. ;