FBG sensor for measuring maximum strain, manufacturing method and using method

A method of manufacturing an FBG sensor for measuring a maximum strain, the method comprising:

• forming an adhesive layer by coating adhesives on one surface of a first metal foil;
• bonding an optical fiber comprising the FBG sensor to the adhesives;
• and
• bonding a second metal foil to the one surface of the first metal foil.

A method of using an FBG sensor for measuring a maximum strain, the method comprising steps of:

• attaching the FBG sensor, fabricated by steps of forming an adhesive layer by coating adhesives on one surface of a first metal foil, bonding an optical fiber comprising the FBG sensor to the adhesives, bonding a second metal foil to the one surface of the first metal foil;
• and cutting the first and the second metal foils in a required form, to an object to be measured;
• inputting a specific input signal to the optical fiber while the object to be measured is deformed or after the object to be measured is deformed;
• measuring an output signal of the FBG sensor based on the input signal;
• measuring a residual strain of the object to be measured based on the output signal;
• and
• a maximum strain using the measured residual strain value and a sensitivity coefficient calculated through experiments.