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In this paper, various types of non-destructive inspection techniques have been discussed. We also experimentally investigate the usage of optical sensors as a non-destructive approach towards tube boiler inspection. The experiment has been carried out onto a carbon steel U-tube with sensors being installed at critical positions of the tubes. It was observed that different thicknesses along the curved...
A flexible, streamline and lightweight optical fibre connector-less interface composed of composite materials has been developed. Light is coupled in and out of the interface via a fibre launch system. A fibre Bragg grating (FBG) is embedded into the composite structure in order to investigate the optical performance of the interface. It is shown that an optical connection is maintained between the...
A review of photonic crystal fiber sensors with microbubble is presented. The work concentrate in three sensing fields: the first reports on temperature sensing; the second describes on strain sensing; the last part focuses on refractive index sensing and bio-sensing. The method of fabricating the microbubble is also briefly discussed.
We report our recent research on the polarization maintaining photonic crystal fiber (PMPCF) based inter-modal interferometer and its applications. The interferometer is constructed by a single mode fiber (SMF)-PMPCF-SMF structure, with a slight core-offset at one splice joint. The fabrication process only involves splicing and cleaving. It has the advantages of compact structure, low cost, easy fabrication,...
A low insertion loss and compact all-fiber short carbon nanotube based saturable absorber (SA) is presented. By connecting the SA in a linear cavity Erbium-doped Fiber Laser, passively Q-switched EDFL with high pulse-repetition-rate is achieved.
This paper establishes a Volterra predator-prey model with three biological populations, and specify the steady-state numbers of the three populations. Then, based on AHP, obtain the ratio of different species in the second population. When other species are not totally suppressed, with an improved predator-prey model we simulate the current situation to obtain predicted numbers of populations, and...
To the robust normalization and robust stabilization for the descriptor systems with uncertain parameters, the matrix inequations and Lyapunov ineqation are used to get, respectively, sufficient conditions for the normalization of closed-loop descriptor systems via proportional and derivative state feedback (PDSF) and proportional and derivative output feedback (PDOF), a sufficient condition for the...
A temperature insensitive refractive index sensor with a core-offset polarization-maintaining photonic crystal fiber interferometer (PMPCF) interferometer is demonstrated. The cladding modes can be effectively excited by core-offsetting one splice joint between the single mode fiber (SMF) and PMPCF in a SMF-PMPCF-SMF structure. When the cladding modes propagate to the other splice joint of the interferometer,...
An erbium-doped fiber ring laser is presented. It consists of an inverse-Gaussian apodized fiber Bragg grating acting as a dual-wavelength passband filter, and an unpumped erbium-doped fiber serving as a saturable absorber. The proposed fiber laser can produce two stable lasing lines in which each of them operates in single-longitudinal-mode (SLM). This dual-wavelength SLM laser can generate a microwave...
A method to estimate FBG sensor module performance is presented. Both temperature effect and stress effect on bare and packaged FBG sensors have been addressed theoretically and experimentally with good agreement.
This paper presents the design of a (n,k) Reed-Solomon decoder for both errors and erasures. The key-equation solver is based on Sarwate's reformulated inversionless Berlekamp-Massey algorithm. The decoder has been implemented on FPGA and the maximum clock frequency can be 150 MHz for a (255, 239) code on a Xilinx Virtex-II device
Embedded fiber Bragg gratings (FBGs) have been fabricated for use as pressure sensors to measure forces applied in the direction perpendicular to the fiber axis. The 1 cm length acrylate-coated FBGs were embedded into fiber-reinforced composites in two orientations in separate samples to test the properties of pressure sensor in each case. In samples where the FBG is embedded in parallel to the carbon...
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