The Experts below are selected from a list of 16899 Experts worldwide ranked by ideXlab platform

Ming Wang - One of the best experts on this subject based on the ideXlab platform.

  • fabry perot fiber sensor for simultaneous measurement of refractive index and temperature based on an in fiber ellipsoidal cavity
    IEEE Photonics Technology Letters, 2012
    Co-Authors: Tingting Wang, Ming Wang
    Abstract:

    A Fabry-Perot fiber sensor for the simultaneous measurement of refractive index (RI) and temperature based on an in-fiber ellipsoidal cavity is proposed. The sensor head consists of an ellipsoidal air-microcavity, which is formed by splicing together a single-mode fiber and a photonic crystal fiber with a Simple Arc-discharge technique. The external RI is determined through the analysis of the fast Fourier transform. The sensor is also capable of simultaneous measurement of temperature by tracking the wavelength shift. Easy fabrication, low-cost, and high-contrast make it appropriate for practical application.

  • micro fabry perot interferometer with high contrast based on an in fiber ellipsoidal cavity
    IEEE Photonics Technology Letters, 2012
    Co-Authors: Tingting Wang, Ming Wang, Haibin Ni
    Abstract:

    We present a high-contrast extrinsic Fabry-Perot interferometer (HCEFPI) with an in-fiber ellipsoidal cavity. The ellipsoidal air-microcavity is formed by splicing together a single-mode fiber and a photonic crystal fiber with the Simple Arc-discharge technique. The propagation loss in the cavity can be very low due to the confocal cavity and very short cavity. Experiments have shown that the HCEFPI has a fringe contrast of ~ 30 dB. Temperature insensitivity, high contrast, and high robustness make it appropriate for high-resolution and long-range sensing without temperature compensation.

Tingting Wang - One of the best experts on this subject based on the ideXlab platform.

  • fabry perot fiber sensor for simultaneous measurement of refractive index and temperature based on an in fiber ellipsoidal cavity
    IEEE Photonics Technology Letters, 2012
    Co-Authors: Tingting Wang, Ming Wang
    Abstract:

    A Fabry-Perot fiber sensor for the simultaneous measurement of refractive index (RI) and temperature based on an in-fiber ellipsoidal cavity is proposed. The sensor head consists of an ellipsoidal air-microcavity, which is formed by splicing together a single-mode fiber and a photonic crystal fiber with a Simple Arc-discharge technique. The external RI is determined through the analysis of the fast Fourier transform. The sensor is also capable of simultaneous measurement of temperature by tracking the wavelength shift. Easy fabrication, low-cost, and high-contrast make it appropriate for practical application.

  • micro fabry perot interferometer with high contrast based on an in fiber ellipsoidal cavity
    IEEE Photonics Technology Letters, 2012
    Co-Authors: Tingting Wang, Ming Wang, Haibin Ni
    Abstract:

    We present a high-contrast extrinsic Fabry-Perot interferometer (HCEFPI) with an in-fiber ellipsoidal cavity. The ellipsoidal air-microcavity is formed by splicing together a single-mode fiber and a photonic crystal fiber with the Simple Arc-discharge technique. The propagation loss in the cavity can be very low due to the confocal cavity and very short cavity. Experiments have shown that the HCEFPI has a fringe contrast of ~ 30 dB. Temperature insensitivity, high contrast, and high robustness make it appropriate for high-resolution and long-range sensing without temperature compensation.

Haibin Ni - One of the best experts on this subject based on the ideXlab platform.

  • micro fabry perot interferometer with high contrast based on an in fiber ellipsoidal cavity
    IEEE Photonics Technology Letters, 2012
    Co-Authors: Tingting Wang, Ming Wang, Haibin Ni
    Abstract:

    We present a high-contrast extrinsic Fabry-Perot interferometer (HCEFPI) with an in-fiber ellipsoidal cavity. The ellipsoidal air-microcavity is formed by splicing together a single-mode fiber and a photonic crystal fiber with the Simple Arc-discharge technique. The propagation loss in the cavity can be very low due to the confocal cavity and very short cavity. Experiments have shown that the HCEFPI has a fringe contrast of ~ 30 dB. Temperature insensitivity, high contrast, and high robustness make it appropriate for high-resolution and long-range sensing without temperature compensation.

S Mori - One of the best experts on this subject based on the ideXlab platform.

  • algebraic description of curve structure
    IEEE Transactions on Pattern Analysis and Machine Intelligence, 1992
    Co-Authors: Hirobumi Nishida, S Mori
    Abstract:

    The authors propose a compact and concise method of describing curves in terms of the quasi-topological features and the structure of each singular point. The quasi-topological features are the convexity, loop, and connectivity. The quasi-topological structure is analyzed in a hierArchical way, and algebraic structure is presented explicitly for each representation level. The lower-level representations are integrated into the higher-level one in a systematic way. When a curve has singular points (branch points), the curve is decomposed into components, where each is a Simple Arc or a Simple closed curve, by decomposing each singular point. The description scheme is applied to character recognition. >

Paul W. Cleary - One of the best experts on this subject based on the ideXlab platform.

  • Three-dimensional modelling of coupled flow dynamics, heat transfer and residual stress generation in Arc welding processes using the mesh-free SPH method
    Journal of Computational Science, 2016
    Co-Authors: R Das, Paul W. Cleary
    Abstract:

    In this paper, a novel mesh-free approach is applied for modelling thermo-mechanical responses in a three-dimensional Arc welding configuration using the Smoothed Particle Hydrodynamics (SPH) method. A fully coupled three-dimensional elastoplastic and heat transfer analysis is used to study the flow pattern of the filler material, and the resulting plastic strain development and temperature distributions for a Simple Arc welding configuration. The mesh-less and Lagrangian nature of SPH enables modelling of problems with large deformation and discontinuities, avoiding several disadvantages of the traditional mesh-based methods (e.g., FEM, FDM and FVM), and it is also able to implement coupled physics and complex constitutive behaviours due to the history tracking ability of the method. The plastic deformation and temperature distribution of the metal in the weld pool and the surrounding parent material are analysed during the cooling stage using SPH, and the resulting residual stresses are evaluated. This work establishes the capability of SPH as a three-dimensional modelling tool for gaining insights into the key physical processes of material deposition and its subsequent evolution during welding processes. Arc welding generates a non-uniform plastic strain distribution. The welding speed is found to be a crucial factor in controlling the plastic strain distribution and the quality of the welded joint, and there is a critical welding speed which produces the most uniform plastic strain distribution in the weld pool. The SPH method is able to predict the long term thermo-mechanical responses, namely heat transfer and residual stresses in the welded joint during the cooling stage. The SPH solutions demonstrate non-uniform cooling rates and temperature fields in a workpiece, as exhibited in practical welding processes. The solutions also show the existence of high temperature gradients around the boundary of the weld, which causes rapid microstructural and phase transformations. The SPH method also incorporated the evaluation of thermal residual stresses in the workpiece. In the early stages of welding, the residual stress varies rapidly with time and subsequently changes gradually. The residual stress variation over the welded joint depends on the local temperature gradients. The residual stress is very high at the interface between the filler and parent material and decreases rapidly further away from it. The typical thermo-mechanical behaviour found in the present study conforms to the observations of real life Arc welding processes.