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Engineering
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(2006) Khawaja, Riffat HassanThesis
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(2006) Zhou, LingThesis
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(2006) Childs, Paul; Wong, Allan; Peng, Gang-DingJournal ArticleThe performance of a strain sensor system based on the use of carrier-modulated gratings and Fourier-domain decoding is analyzed. For three sensors, Young`s modulus is measured as 69.98 ± 0.27, 69.15 ± 0.81, and 70.65 ± 0.58 GPa. Crosstalk is shown to exist only when two sensors are designed with an overlap of the carrier band in the Fourier domain. Improving the data processing shows it is possible to limit this crosstalk to a value below that of the system error. © 2006 IEEE.
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(2006) Wang, Yi-Ping; Wang, D. N.; Jin, Wei; Rao, Yun-Jiang; Peng, Gang-DingJournal ArticleAn asymmetric long period fiber grating (LPFG) with a large attenuation of -47.39 dB and a low insertion loss of 0.34 dB is fabricated by use of focused CO2 laser beam to carve periodic grooves on one side of the optical fiber. Such periodic grooves and the stretch-induced periodic microbends can effectively enhance the refractive index modulation and increase the average strain sensitivity of the resonant wavelength of the LPFG to -102.89 nm/m epsilon. The resonant wavelength and the peak attenuation of the LPFG can be tuned by similar to 12 nm and similar to 20 dB, respectively, by the application of a stretching force. (c) 2006 American Institute of Physics.
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(2006) Peng, Gang-Ding; Whitbread, Trevor; Leung, Ian; Chen, Xiao-Bao; Zhu, Qing; Zhou, Shaoling; Meng, QConference PaperDistributed feedback fibre laser based hydrophone systems have great potential for high sensitivity underwater acoustic detection. Here we report on recent progress in our research and development of distributed feedback fibre laser hydrophone systems. We discuss the system configuration as well as sensor design, fabrication and packaging for high acoustic pressure sensitivity. In particular we report the significant performance improvement achieved in our experimental investigations.
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(2006) Leung, Ian; Peng, Gang-DingConference PaperIn the following paper is presented an investigation of a composite cavity fibre laser with active feedback cavity. By employing strong-reflection and active feedback cavity, an in-housee fabricated 12cm long composite cavity fibre laser was able to sustain single longitudinal mode operation at 60uW without mode hopping
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(2006) Wong, Allan; Childs, Paul; Peng, Gang-Ding; Gowripalan, NadarajahConference PaperFibre Bragg grating (FBG) sensors are used for the experimental investigation of two of the most important time-dependent properties of concrete: drying shrinkage and creep. A swept wavelenght system is used as the interrogation technique. The FBG sensors are embedded directly into structural grade concrete specimens. Standard mechanical method is used in parallel with embedded FBG sensors. Both mechanically and optically measured time-dependent strains are discussed. It is shown that the FBG sensors offer a better alternative to the conventional electrical and mechanical methods, in the measurement of long-term time-dependent strains.