Lan Li, Xinyong Dong, Yangqing Qiu, Chunliu Zhao, Yiling Sun
An intensity-modulated, fiber Bragg grating (FBG) vibration sensor is proposed and experimentally demonstrated. An initially-uniform FBG is glued with a slanted direction onto the lateral surface of a simply-supported beam (SSB). A mass fixed in the middle of the beam transfers the vertical vibration to the deflection of the beam. Nouniform strain field generated by beam bending is applied along the FBG and makes it chirped. The sensing mechanism is based on the measurement of reflected optical power of a strain-chirped FBG. The optical power from the FBG is measured with a photodetector...
TC2 Symposium 2010
· TC2
· 2010
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Yanjun Zhang, Yuling Su, Bo Wei, Weihong Bi
This paper presents a new type of distributed Fiber Bragg grating (FBG) sensing system based on a tunable pulse laser. The system has 500 gratings with same centre wavelengths of 1550 nm and the spacing of every grating is 3m. All gratings have been packaged and 27m delay lines are inserted between every two adjacent gratings. The scanning periodic time of tunable pulsed laser is 0.25 s; the scanning range is 1545 ~ 1555 nm; the laser pulse line width is 0.18 nm. If the grating temperature was constant, only the 1550 nm light was reflected back. But with temperature change, the grating...
TC2 Symposium 2010
· TC2
· 2010
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Wenwen Qian, Chun-Liu Zhao, Xinyong Dong, Yanqing Qiu, Shangzhong Jin
A novel polarizer is designed by liquid filling in the partial air holes of hollow-core photonic bandgap fiber (PBGF) forming an asymmetric waveguide structure. Applied a full-vector finite-element (FEM) method, it is demonstrated that the proposed polarizer has a high polarization extinction ratio more than 35 dB.
TC2 Symposium 2010
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· 2010
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S. L. He, C. L. Zhao, X. Y. Dong, Z. X. Zhang, S. Z. Jin
A compact temperature sensor based on a fiber loop mirror (FLM) combined with a liquid-filled high-birefringent photonic crystal fiber (HiBi-PCF) is designed and numerically analyzed. A quite high temperature sensitivity of 1.87 nm/ºC can be achieved.
TC2 Symposium 2010
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· 2010
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Ruifeng Zhao, Li Pei, Zhuoxuan Li, Tigang Ning , Linyong Fan, Weiwei Jiang
A low cost, compact and lossless temperature sensor based on twin-core fiber(TCF) is demonstrated and manufactured by splicing two single mode fibers(SMF) to the ends of a piece of TCF. The extinction ratio of the comb transmission spectrum is bigger than 15dB. The operating temperature range from to is tested and the temperature sensitivity of below 90℃ and above 90℃ is obtained. Finite element method (FEM) is used to calculate the propagation constant of the two supermodes, which is consistent with the comb transmission spectrum of the experiment.
TC2 Symposium 2010
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· 2010
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Liyi Jiang, Huacai Chen, Bo Cai
In this paper, a portable near-infrared spectroscopy (NIR) analyzer was developed with the semiconductor refrigerating InGaAs array near-infrared spectrometer. A constant temperature transmission cell sample was designed, and the spectral analysis software was developed, and the calibrtion models were established for the analyzer. Take the 54 rice wine samples as the main detected objective, the calibration models of alcohol and non-sugar solids in the rice wine were built with the pretreatment of 2nd derivative and 1st derivative. The R2 is 99.94% for alcohol and 99.29% for non-sugar...
TC2 Symposium 2010
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· 2010
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Jianfeng Wang, Yongxing Jin, Zaixuan Zhang, Changyu Shen, Yanqing Qiu
Working principle, engineering application and development trends of distributed optical fiber temperature sensor (DTS) system is introduced briefly in his paper. Factors determining length of sensing optical fiber is researched in particularly. In distributed optical fiber temperature sensor system, length of sensing optical fiber is determined by power of laser pulse, loss coefficient and signal to noise ratio (SNR) of the system. Using optical switch can extend sensing length of the system. A driver interface based on MCU chip for a multi-mode prism 1×2 optical switch is designed. DTS...
TC2 Symposium 2010
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· 2010
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Guoqing Wu, Weihong Bi, Jiaming Lv, Guangwei Fu
Chemical oxygen demand (COD) is a synthetical indicator which represents the degree of organic pollution in water. The near-infrared (NIR) transmission and the UV absorbance method based on photoelectric detection technology and spectroscopy analysis have some advantages such as high precision, fast, non-contact, no secondary pollution etc compared to conventional wet chemical method. The NIR transmission spectra and UV absorbance spectra of standard solution configured with phthalate hydrogen potassium were collected respectively by MPA FT-IR spectrometer (Bruker Optics Inc.) made in...
TC2 Symposium 2010
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· 2010
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Gaohui Zhang, Guoqing Huang, Pinze Zhang, Pen Xu, Gen Li, Mingzhou Yu, Shunqi Zhang
In order to improve the burn-resistant property of titanium alloy, Ti-Mo burn-resistant alloyed layer was coated by permeating the Molybdenum(Mo) into the Ti6Al4V substrate with the double glow plasma surface alloying technology. The experiment was performed at the work temperature of 800° to keep warm for 2.5 hours under the air pressure of 30 Pa, where Molybdenum and Ti6Al4V was used as the source electrode and cathode respectively. The result of X-ray diffraction shows that the alloy phase of Ti and Mo has been formed on the surface of Ti6Al4V substrate. The hardness of the alloyed layer...
TC2 Symposium 2010
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· 2010
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Changyu Shen
Core/shell CdSe /ZnS quantum dots (QDs) were synthesized by thermal deposition using cadmium oxide and selenium as precursors in a hot lauric acid and hexadecylamine trioctylphosphine oxide hybrid. The CdSe/ZnS QDs exhibited high photoluminescence efficiency with a quantum yield more than 41%, and size-tunable emission wavelengths from 500 to 620 nm. White light-emitting diode with CIE coordinates of (0.319, 0.32) was fabricated by combining blue InGaN chip with CdSe /ZnS QDs.
TC2 Symposium 2010
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· 2010
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