Patent ID: 9062965
Filing Date: 2015-06-23
Classification: G01B,G01D

Abstract:
1. A multi-point measuring method of FBG sensor, having a first optical fiber, forming a diffraction grating on a first core and comprising a first delaying fiber having a first delay time, and a second optical fiber forming a diffraction grating on a second core and comprising a second delaying fiber having a second delay time, comprising the following steps of: modulating a light from a light source within a first light modulator; entering the light, which is modulated within said first light modulator, into said first optical fiber and said second optical fiber; modulating reflection lights from the diffraction grating of said first optical fiber and the diffraction grating of said second optical fiber within a second light modulator; conducting photoelectric conversion on the reflection lights, which are modulated within said second light modulator within a photoelectric converter element; and calculating a wavelength from the signal, which is obtained through the photoelectric conversion by said photoelectric converter element, and separating the signal from said first optical fiber from the signal from said second optical fiber, in a time-sequential manner, thereby to measure deformation of a target to be measured.