期刊
OPTICAL FIBER TECHNOLOGY
卷 17, 期 4, 页码 286-290出版社
ELSEVIER SCIENCE INC
DOI: 10.1016/j.yofte.2011.05.001
关键词
Optical fiber sensing; Linear edge; Dynamic-temperature compensating; Tilted fiber Bragg grating (TFBG)
资金
- National Natural Science Foundation of China [60736039, 60806030, 10904075]
- Tianjin Natural Science Fund projects [08JCYBJC14600, 20100703, 10SYSYJC27700]
In this paper, a system of linear edge filter demodulation based on weakly tilted fiber Bragg gratings in fiber sensor was proposed. The linear edge of the cladding-mode envelope and temperature characteristic between cladding modes and core mode of tilted fiber Bragg grating (TFBG) were experimentally investigated. The results show that falling edge (1505-1535 nm) and rising edge (1545-1565 nm) of the cladding-mode envelope is approximately linear and can be used as an edge filter. Moreover, the temperature characteristics of the core mode and cladding modes are similar to FBG's. It can dynamically compensate the temperature induced wavelength shift of the FBG and the effect of temperature on the demodulated sensing signals is minimized. The advantages of this simple system are an all-fiber design, quasi static and dynamic operation, high stability and lower cost. (C) 2011 Elsevier Inc. All rights reserved.
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