Simultaneous Measurement of Bending-Curvature and Temperature Using Single Tilted Fiber Bragg Grating

In this paper, the mode coupling mechanism of tilted fiber Bragg gratings (TFBGs) is briefly introduced at first. And a general review on the fabrication, theoretical and experimental research development of TFBGs is presented from a worldwide perspective, followed by an introduction of our current research work on TFBGs at the Institute of Modern Optics, Nankai University (IMONK), including TFBG sensors for single-parameter measurements, temperature cross sensitivity of TFBG sensors, and TFBG-based interrogation technique. Finally, we would make a summary of the related key techniques and a remark on prospects of the research and applications of TFBGs.

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Tilted fiber Bragg gratings: Principle and sensing applications

Dong

et al. 2010

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Simultaneous measurement of temperature and bending-curvature using a single local micro-structured longperiod fiber grating

Cao¹,

Pei²,

Tong³

2014

Acta Phys. Sin.

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A local micro-structured long-period fiber grating (LMSLPFG) is proposed and investigated experimentally. The LMSLPFG is fabricated by using hydrofluoric acid (HF) to partially etch a standard long-period fiber grating (LPFG), thereby forming a local defect in the cladding. The theoretical analysis and experimental results show that partially etching will change the effective refractive index modulation in the cladding mode, which equivalently introduces a phase shift into the part of defect and manifests, in the spectrogram, as openning a transmission window between the stopbands, forming two transmission stopbands and one transmission passband. On this basis we study the temperatures and bending characteristics of the two stopbands and one passband. The results show that the temperature sensitivities of the two stopbands and one passband are all approximately 0.05 nm/℃; the bending sensitivity of the passband (2.61 nm/m-1) is less than those of two stopbands (4.71 nm/m-1). Thus by using the sensitive matrix, we can simultaneously measure the curvature and temperature, with only one grating used.

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Simultaneous Measurement of Bending-Curvature and Temperature Using Single Tilted Fiber Bragg Grating

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Tilted fiber Bragg gratings: Principle and sensing applications

Tilted fiber Bragg gratings: Principle and sensing applications

Simultaneous measurement of temperature and bending-curvature using a single local micro-structured longperiod fiber grating

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