Simultaneous measurement of strain and temperature using fiber Bragg grating sensors embedded in hybrid composite laminates

摘要

The use of fiber Bragg grating sensors embedded in hybrid composite laminates for simultaneous measurement of strain and temperature is proposed. The hybrid structure, formed by a pre-impregnated thermoset and thermoplastic composites, contains one single fiber Bragg grating embedded in each material, connected in series with each other. A different response is observed when the smart composite laminate is subjected to strain and to temperature. This is expected due to the distinct properties presented by each material. The rms deviation obtained for a temperature range between 20 and 60 deg C is +- 0.97 deg C and for a strain range from 0 to 1100 (mu)(epsilon) is +-13.04 (mu)(epsilon).