A TECHNIQUE TO PACKAGE FIBER BRAGG GRATING SENSORS FOR STRAIN AND TEMPERATURE MEASUREMENTS
Keywords:Fiber Bragg gratings, packaging, strain and temperature measurement
This paper reports an effective method of packaging a fiber Bragg grating (FBG) for the simultaneous measurement of temperature and strain. The technique consists of embedding two fiber Bragg grating sensors inside a polymeric material with different geometrical characteristics. The mechanical and thermal characterizations of the optical transducer were performed. Then a matrix equation used measurements of the wavelength shifts from the two sensors and yielded information about the temperature and strain coefficients. The preliminary results demonstrate the feasibility of the encapsulation technique allowing measurements of temperature and strain in smart structures and harsh environments. The experimental procedure provides robustness to the sensor and the matrix equation approach has the potential to determine simultaneously the strain and temperature coefficients.
Journal of Lightwave Technology, vol. 22, no. 1, pp. 39–50, Jan. 2004.
 K. T. V. Grattan and T. Sun, “Fiber optic sensor technology: an overview,” Sensors and
Actuators A: Physical, vol. 82, no. 1–3, pp. 40–61, May 2000.
 C. K. Kirkendall and A. Dandridge, “Overview of high performance fibre-optic sensing,”
Journal of Physics D: Applied Physics, vol. 37, no. 18, pp. R197–R216, 2004.
 B. Lee, “Review of the present status of optical fiber sensors,” Optical Fiber Technology, vol.
9, no. 2, pp. 57–79, Apr. 2003.
 H. N. Li, D. S. Li, and G. B. Song, “Recent applications of fiber optic sensors to health
monitoring in civil engineering,” Engineering Structures, vol. 26, no. 11, pp. 1647–1657,
 B. Wang, J. G. Teng, L. D. Lorenzis, L.-M. Zhou, J. Ou, W. Jin, and K. T. Lau, “Strain
monitoring of RC members strengthened with smart NSM FRP bars,” Construction and
Building Materials, vol. 23, no. 4, pp. 1698–1711, 2009.
 L. Rippert, J. Papy, M. Wevers, S. V. Huffel, and K. U. Leuven, “Fibre optic sensor for
continuous health monitoring in CFRP composite materials,” Smart Structures and Materials,
vol. 4693, pp. 312–323, 2002.
 E. Mehrani, A. Ayoub, and A. Ayoub, “Evaluation of fiber optic sensors for remote health
monitoring of bridge structures,” Materials and Structures, vol. 42, no. 2, pp. 183–199, Apr.
 M. Majumder, T. K. Gangopadhyay, A. K. Chakraborty, K. Dasgupta, and D. K. Bhattacharya,
“Fibre Bragg gratings in structural health monitoring—Present status and applications,”
Sensors and Actuators A: Physical, vol. 147, no. 1, pp. 150–164, 2008.
 M. R. Mokhtar, T. Sun, and K. T. V. Grattan, “Bragg Grating Packages With Nonuniform
Dimensions for Strain and Temperature Sensing,” IEEE Sensors Journal, vol. 12, no. 1, pp.
139–144, Jan. 2012.
 A. Kerrouche, W. J. O. Boyle, K. T. V. Grattan, J. W. Schmidt, and B. Taljsten, “Strain
Measurement Using Embedded Fiber Bragg Grating Sensors Inside an Anchored Carbon Fiber
Polymer Reinforcement Prestressing Rod for Structural Monitoring,” IEEE Sensors Journal,
vol. 9, no. 11, pp. 1456–1461, Nov. 2009.
 H. Ling, K. Lau, L. Cheng, and K. Chow, “Embedded fibre Bragg grating sensors for nonuniform strain sensing in composite structures,” Measurement Science and Technology, vol.
16, pp. 2415–2424, 2005.
 Y. J. Rao, “Recent progress in applications of in-fibre Bragg grating sensors,” Opt. Lasers
Eng., vol. 31, pp. 297–324, 1999.
 A. Othonos, “Fiber Bragg gratings,” Review of Scientific Instruments, vol. 68, no. 12, p. 4309,
 A. D. Kersey, “Fiber optic sensors shine bright: industrial applications where FOS bring
differentiated performance/value,” vol. 8421, pp. 1–4, 2012.
 O. Frazão and J. L. Santos, “Simultaneous measurement of strain and temperature using a
Bragg grating structure written in germanosilicate fibres,” Journal of Optics A: Pure and
Applied Optics, vol. 6, no. 6, pp. 553–556, Jun. 2004.
 L. Kuo and Z. Zhen’an, “A high sensitive fiber Bragg grating strain sensor with automatic
temperature compensation,” Chinese Optics Letters, vol. 7, no. 3, pp. 191–193, 2009.
 X. Shu, Y. Liu, D. Zhao, B. Gwandu, F. Floreani, L. Zhang, and I. Bennion, “Dependence of
temperature and strain coefficients on fiber grating type and its application to simultaneous
temperature and strain measurement.,” Optics letters, vol. 27, no. 9, pp. 701–3, May 2002.