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ABSTRACT: An accelerometer based on the strain and bend characteristics of long period fiber grating (LPFG), which fabricated in common communication optical single mode fiber by using CO2 laser pulses, is investigated in this article. The relationship between vibration of the uniform strength beam and the light intensity of LPFG is analyzed. Experimental results show that the acceleration measuring system has a sensitivity of ∼2.82 v/g. The error between theoretical and experimental value is about 0.82%. Such kind of accelerometers have many advantages as low cost, a high sensitivity, can withstand temperatures up to 800°C, and achieve temperature self-compensation. It would have great potential applications in measuring in real-time and high temperature place. © 2011 Wiley Periodicals, Inc. Microwave Opt Technol Lett 53:841–845, 2011; View this article online at wileyonlinelibrary.com. DOI 10.1002/mop.25875
Microwave and Optical Technology Letters 02/2011; 53(4):841 - 845. · 0.62 Impact Factor
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ABSTRACT: An all-fiber Fabry–Pérot accelerometer based on cantilever structure is constructed in this article.The Fabry–Pérot interferometer is formed by splicing the ends of two SMF-28e fibers to the cleaved end of a hollow-core photonic crystal fiber (HCPCF). We analyzed the relationship between the length of HCPCF cavity, light intensity, voltage of photoelectronic detector, and the deflection of the cantilever free end. Thus, the simple theoretical formula is achieved to calculate acceleration. Experimental results show that the resolution of the measuring system is about 8.42 × 10−7g and the sensitivity is 0.3386 v/g. In addition, Such kind of Fabry–Perot sensing structure is low sensitive to temperature and bending. It is anticipated that the Fabry–Pérot interferometer accelerometers have wide application prospects in the field of inertial navigation and vibration measurements. © 2010 Wiley Periodicals, Inc. Microwave Opt Technol Lett 52:2531–2535, 2010; View this article online at wileyonlinelibrary.com. DOI 10.1002/mop.25529
Microwave and Optical Technology Letters 08/2010; 52(11):2531 - 2535. · 0.62 Impact Factor
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ABSTRACT: A novel miniature fiber-optic Fabry-Perot (F-P) refractive-index (RI) sensor machined by 157 nm laser is proposed. The sensor head consists of a micro air F-P cavity near the tip of a single-mode fiber with a micro channel on the fiber tip used as both inlet and outlet for medium under test. Thin films are coated at reflective interfaces of the F-P cavity as mirrors to ensure high optical contrast, respectively. A RI resolution of 1130.887 nm/RI unit (RIU) is achieved by experiment. Such a sensor has a number of outstanding advantages when compared with other fiber-optic RI sensors, such as very small, rigid, high resolution, excellent linearity, wide measurement range, et al.
Journal of Lightwave Technology 01/2010; · 2.78 Impact Factor
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ABSTRACT: An ultra-long-period fiber grating with periodic groove structure (G-ULPFG) fabricated by using an edge-written method with high-frequency CO<sub>2</sub> laser pulses is proposed in this paper. The experimental results show that the different resonant peaks of the G-ULPFG have different temperature and refractive index sensitivities and, in particular, the refractive index sensitivity is much larger than that of conventional ULPFG due to the edge-groove structure. Such a kind of G-ULPFGs could be used as a highly sensitive optical refractometer with temperature self-compensation.
IEEE Sensors Journal 07/2009; · 1.52 Impact Factor
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ABSTRACT: Asymmetric transverse-load characteristics and the polarization dependence of long-period fiber gratings (LPFGs) written by high-frequency CO(2) laser pulses are investigated in detail. It is demonstrated that the resonant wavelength is dependent on the direction of the applied force and on the polarization state of the input light; however, the coupling strength is independent of these parameters. When a transverse load is applied along different orientations of the LPFG, the resonant wavelength may be shifted toward the longer wavelength, the shorter wavelength, or hardly shifted, whereas the absolute value of peak transmission attenuation is linearly decreased with an increase of the applied transverse load, with almost no sensitivity to the load direction. These unique transverse-load characteristics and the polarization dependence are due to the load-induced birefringence that leads to the rotation of optical principal axes in the LPFG.
Applied Optics 07/2007; 46(16):3079-86. · 1.41 Impact Factor
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ABSTRACT: We have demonstrated a novel technique for simultaneous measurement of static strain, temperature, vibration and transverse load for structural health monitoring using an integrated FBG/EFPI/LPFG sensor. Preliminary results show that this technique combines the advantages of the FBG, LPFG and low-coherence-interferometry, such as immune to EMI, high accuracy and resolution, small and compact sensor head, corrosion resistance etc. This sensor system is well-suited to health monitoring of large engineering structures, such as highways, bridges, buildings and aircrafts.
Optical Fiber Sensors Conference Technical Digest, 2002. Ofs 2002, 15th; 02/2002
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ABSTRACT: We propose a novel Fabry–Perot optical fiber tip sensor for high temperature measurement. The sensor consists of a short section of a special all-silica photonic crystal fiber spliced at one end to a silica single-mode fiber. Because of its all-silica structure, the sensor allows linear and stable measurements of temperature up to 1200 °C with a high sensitivity. The sensor is easy and inexpensive to fabricate and could find wide applications in mechanics, aeronautics, and metallurgy.
Optics Communications 283(19):3683-3685. · 1.49 Impact Factor
