System for structural strain sensing by optical fiber sensor

A system for sensing strain of an optic fiber structure which uses a wavelength swept fiber laser as a light source and uses a fiber Bragg grating sensor as fiber optic sensor, the system comprising:

• a reference optic fiber Bragg grating sensor installed without subjecting to strain;
• a fiber Bragg grating sensor array established at the optic fiber structure and including at least one fiber Bragg grating sensor for sensing a strain of the optic fiber structure, wherein the optic fiber Bragg grating sensor is branched from the reference optic fiber Bragg grating sensor by a first coupler;
• a strain rate measuring coordinate signal-outputting means branched from an fiber Bragg grating sensor group comprising the reference optic fiber Bragg grating sensor and the optic fiber Bragg grating sensor array for outputting an optical signal having a certain wavelength;
• and
• an optical detector for detecting output signals of the optic fiber Bragg grating sensor group and the strain rate measuring coordinate signal-outputting means.