and strain field is changed around the damage.FBG sensor is adapted to detection of this change
because it is high sensitivity to strain and easy to compose sensor net.A bolts damage detection method using FBG sensor is presented
which is displaced on the surface of structure.The normalized strain vector is called"pattern".It has no relation to intensity of load
but has correlation to load point
so the pattern can describe strain field.If a correlation coefficient which is calculated using health pattern and damage pattern is less than 1 greatly
the bolt which is near load point can be considered to be damaged.An experiment on wing segment of plane is conducted to verify this method.
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