Strain measurement of superalloy and ceramic matrix composites by using FBG sensor
The strain characteristics of superalloy and ceramic matrix composites were measured by fiber Bragg grating(FBG)strain sensor,and the measurement results were compared with those measured by resistance strain gauge.FBG strain sensor and the resistance strain gauge were respec-tively pasted on the positive and negative sides of the superalloy and ceramic matrix composite speci-mens.The mechanical testing machine was used to apply given load to the two specimens,and the signals of FBG strain sensor and the resistance strain gauge were demodulated in real time by FBG in-terrogator and the strain recorder respectively.The results showed that FBG strain sensor and the re-sistance strain gauge were almost consistent within a certain range of strain.Therefore,FBG strain sensor could be used to measure the strain of materials by replacing the resistance strain gauge.
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