An interrogation technique for fiber Bragg grating sensors based on optical time-domain reflectometry
Tóm tắt
A method for fiber Bragg grating (FBG) interrogation is proposed. The method rests on measuring the light intensity reflected from FBG sensors by means of a standard optical time-domain reflectometer. Multiple FBGs along the fiber optic line are interrogated through time division multiplexing. Specifications of FBGs enabling linear response of the sensors to strain and temperature are determined. The threshold sensitivity to strain is 0.8 · 10−4; the threshold sensitivity to temperature is 5°C.
Tài liệu tham khảo
B. Lee, “Review of the Present Status of Optical Fiber Sensors,” Opt. Fiber Technol. 9, 57 (2003).
Y. J. Rao, “Recent Progress in Applications of In-Fibre Bragg Grating Sensors,” Opt. and Lasers in Eng. 31, 297 (1999).
A. D. Kersey, M. A. Davis, H. J. Patrick, et al., “Fiber Grating Sensors,” Journ. Lightwave Technol. 15(8), 1442 (1997).
J. Ou, “Some Recent Advances of Intelligent Health Monitoring Systems for Civil Infrastructures in HIT,” Proc. SPIE 5851, 147 (2004).
O. I. Medvedkov, I. G. Korolev, and S. A. Vasilyev, Recording Fiber Bragg Gratings in a Scheme with Lloyd’s Interferometer, Preprint No. 6, SCFO (Prokhorov Inst. of General Physics, Moscow, 2004), p. 46.
S. A. Vasilyev, O. I. Medvedkov, I. G. Korolev, et al., “Refractive Index Fiber Gratings with Applications,” Kvantovaya Elektron. 35(12), 1085 (2005).
G. Meltz, W. W. Morey, and W. H. Glenn, “Formation of Bragg Gratings in Optical Fibers by a Transverse Holographic Method,” Opt. Lett. 14, 823 (1989).
S. R. Abdullina, S. A. Babin, A. A. Vlasov, and S. I. Kablukov, “Intracavity Doubling Generation Frequency in a Wide-Aperture Ar Laser,” Kvantovaya Elektron. 35, 857 (2005).