Real-time measuring device and method of dynamic strain

摘要

An apparatus and method are disclosed for measuring the dynamic strain applied to an optical fiber grating using an Amplified Spontaneous Emission (ASE) profile of an Erbium-Doped Fiber Amplifier (EDFA). The dynamic strain measuring device according to the present invention comprises an EDFA for generating light having a unique ASE spectrum, a fiber Bragg grating connected to the EDFA and an optical fiber and reflecting light incident therefrom, It is connected by an optical fiber and includes a photodetector for detecting optical power of reflected light from the optical fiber grating. The optical fiber grating linearly changes the wavelength of the reflected light according to the applied strain. In addition, the ASE spectrum includes a linear section in which optical power decreases linearly with increasing wavelength, and the wavelength of the reflected light of the optical fiber grating preferably belongs to the linear section. As another embodiment of the present invention, a method for measuring dynamic strain is disclosed. The dynamic strain measurement method includes generating light having a unique ASE spectrum including a linear section in which optical power decreases linearly with increasing wavelength, and each of the plurality of wavelength sections in which the linear section of the ASE spectrum is divided. Reflecting light of the ASE spectrum by a plurality of optical fiber gratings reflecting light having a wavelength belonging to the optical signal; separating light reflected from the plurality of optical fiber gratings by wavelength; and optical power indicating respective wavelength changes from the distributor The method may include detecting the dynamic strain applied to the optical fiber gratings of the plurality of different positions.