In this paper a novel fiber Bragg grating and extrinsic fiber Fabry-Perot interferometer (FBG/EFPI) sensor which can measure the strain and temperature simultaneously in the smart materials is designed and analyzed. The FBG and EFPI are encapsulated into a special stainless steel structure. The structure makes the FBG strain-sensitive. On the other hand, the EFPI is insensitive to the strain but sensitive to the temperature. The strain sensitivity and the temperature sensitivity are derived in details. Experiments show that the sensor has good performance and high accuracy (0.1°C for temperature and 1.3pm/με for strain). In conclusion, the FBG/EFPI sensor is applicable for simultaneous measurement of strain and temperature in smart materials and structure health monitoring.

Date Published: 1 November 2007
PDF: 6 pages
Proc. SPIE 6423, International Conference on Smart Materials and Nanotechnology in Engineering, 64233T (1 November 2007);

Published in SPIE Proceedings Vol. 6423:
International Conference on Smart Materials and Nanotechnology in Engineering
Shanyi Du; Jinsong Leng; Anand K. Asundi, Editor(s)