The Experts below are selected from a list of 15156 Experts worldwide ranked by ideXlab platform

Zeeshan Ahmed - One of the best experts on this subject based on the ideXlab platform.

  • ultra sensitive chip based photonic temperature sensor using ring resonator structures
    Optics Express, 2014
    Co-Authors: Mohammad Hafezi, Jingyun Fan, Jacob M Taylor, Gregory F Strouse, Zeeshan Ahmed
    Abstract:

    Resistance thermometry provides a time-tested method for taking temperature measurements. However, fundamental limits to resistance-based approaches has produced considerable interest in developing photonic temperature sensors to leverage advances in frequency metrology and to achieve greater mechanical and environmental stability. Here we show that silicon-based optical ring resonator devices can resolve temperature differences of 1 mK using the traditional wavelength scanning methodology. An even lower noise floor of 80 μK for measuring temperature difference is achieved in the side-of-fringe, Constant Power Mode measurement.

  • ultra sensitive chip based photonic temperature sensor using ring resonator structures
    arXiv: Optics, 2013
    Co-Authors: Mohammad Hafezi, Jingyun Fan, Jacob M Taylor, Gregory F Strouse, Zeeshan Ahmed
    Abstract:

    Resistance thermometry provides a time-tested method for taking temperature measurements. However, fundamental limits to resistance-based approaches has produced considerable interest in developing photonic temperature sensors to leverage advances in frequency metrology and to achieve greater mechanical and environmental stability. Here we show that silicon-based optical ring resonator devices can resolve temperature differences of 1 mK using the traditional wavelength scanning methodology. An even lower noise floor of 80 microkelvin for measuring temperature difference is achieved in the side-of-fringe, Constant Power Mode measurement.

Mohammad Hafezi - One of the best experts on this subject based on the ideXlab platform.

  • ultra sensitive chip based photonic temperature sensor using ring resonator structures
    Optics Express, 2014
    Co-Authors: Mohammad Hafezi, Jingyun Fan, Jacob M Taylor, Gregory F Strouse, Zeeshan Ahmed
    Abstract:

    Resistance thermometry provides a time-tested method for taking temperature measurements. However, fundamental limits to resistance-based approaches has produced considerable interest in developing photonic temperature sensors to leverage advances in frequency metrology and to achieve greater mechanical and environmental stability. Here we show that silicon-based optical ring resonator devices can resolve temperature differences of 1 mK using the traditional wavelength scanning methodology. An even lower noise floor of 80 μK for measuring temperature difference is achieved in the side-of-fringe, Constant Power Mode measurement.

  • ultra sensitive chip based photonic temperature sensor using ring resonator structures
    arXiv: Optics, 2013
    Co-Authors: Mohammad Hafezi, Jingyun Fan, Jacob M Taylor, Gregory F Strouse, Zeeshan Ahmed
    Abstract:

    Resistance thermometry provides a time-tested method for taking temperature measurements. However, fundamental limits to resistance-based approaches has produced considerable interest in developing photonic temperature sensors to leverage advances in frequency metrology and to achieve greater mechanical and environmental stability. Here we show that silicon-based optical ring resonator devices can resolve temperature differences of 1 mK using the traditional wavelength scanning methodology. An even lower noise floor of 80 microkelvin for measuring temperature difference is achieved in the side-of-fringe, Constant Power Mode measurement.

Jin Xuan - One of the best experts on this subject based on the ideXlab platform.

  • catalytic hydrogen oxygen reaction in anode and cathode for cold start of proton exchange membrane fuel cell
    International Journal of Hydrogen Energy, 2015
    Co-Authors: Yueqi Luo, Kui Jiao, Bin Jia, Qing Du, Yan Yin, Huizhi Wang, Jin Xuan
    Abstract:

    Abstract Fuel cell vehicles (FCVs) have shown the potential of commercialization in recent years. The concerns on the startup ability of proton exchange membrane (PEM) fuel cell stack from subfreezing temperature have risen. The hydrogen–oxygen catalytic reactions assisted cold start method is developed and analyzed in this study. It utilizes a small amount of hydrogen/air mixture to react at low temperature in the catalyst layers (CLs) through platinum catalyst. The interactions between this assisted method and various startup Modes are the major issue to be discussed. Anode catalytic reaction with air mole fraction higher than 16% is effective to assist a 30-cell stack starting from −25 °C within 13 s in maximum Power Mode. However, cathode catalytic reaction cannot sustain a successful startup. The anode humidification effect plays an important role to reduce the stack resistance, and to increase the inherent heat generation rate. In maximum Power Mode and high current density Constant Power Mode, anode catalytic reaction assisted cold start can be achieved within 10–20 s from −40 °C. Anode air mole fraction must be higher than 18% to ensure the successful cold start in these two Modes. For Constant Power Mode, the operating Power must be lower than 12 W per cell. In Constant current Mode, when the current density is low, there would be less demand for anode catalytic reaction to achieve successful startup from −40 °C, indicating that lower current density operations have better survivability in low temperature. Nevertheless, much longer start duration is required for lower operating current. Generally, high current density operating Mode with high air mole fraction is a more practical and energy efficient cold start strategy, as the startup time can be reduced significantly. Cold start from about −20 °C without ice accumulation is feasible using this method, which may have reduced concern about degradation. Increasing the volume of CL (porosity and thickness) also helps reduce the ice formation.

Jingyun Fan - One of the best experts on this subject based on the ideXlab platform.

  • ultra sensitive chip based photonic temperature sensor using ring resonator structures
    Optics Express, 2014
    Co-Authors: Mohammad Hafezi, Jingyun Fan, Jacob M Taylor, Gregory F Strouse, Zeeshan Ahmed
    Abstract:

    Resistance thermometry provides a time-tested method for taking temperature measurements. However, fundamental limits to resistance-based approaches has produced considerable interest in developing photonic temperature sensors to leverage advances in frequency metrology and to achieve greater mechanical and environmental stability. Here we show that silicon-based optical ring resonator devices can resolve temperature differences of 1 mK using the traditional wavelength scanning methodology. An even lower noise floor of 80 μK for measuring temperature difference is achieved in the side-of-fringe, Constant Power Mode measurement.

  • ultra sensitive chip based photonic temperature sensor using ring resonator structures
    arXiv: Optics, 2013
    Co-Authors: Mohammad Hafezi, Jingyun Fan, Jacob M Taylor, Gregory F Strouse, Zeeshan Ahmed
    Abstract:

    Resistance thermometry provides a time-tested method for taking temperature measurements. However, fundamental limits to resistance-based approaches has produced considerable interest in developing photonic temperature sensors to leverage advances in frequency metrology and to achieve greater mechanical and environmental stability. Here we show that silicon-based optical ring resonator devices can resolve temperature differences of 1 mK using the traditional wavelength scanning methodology. An even lower noise floor of 80 microkelvin for measuring temperature difference is achieved in the side-of-fringe, Constant Power Mode measurement.

Gregory F Strouse - One of the best experts on this subject based on the ideXlab platform.

  • ultra sensitive chip based photonic temperature sensor using ring resonator structures
    Optics Express, 2014
    Co-Authors: Mohammad Hafezi, Jingyun Fan, Jacob M Taylor, Gregory F Strouse, Zeeshan Ahmed
    Abstract:

    Resistance thermometry provides a time-tested method for taking temperature measurements. However, fundamental limits to resistance-based approaches has produced considerable interest in developing photonic temperature sensors to leverage advances in frequency metrology and to achieve greater mechanical and environmental stability. Here we show that silicon-based optical ring resonator devices can resolve temperature differences of 1 mK using the traditional wavelength scanning methodology. An even lower noise floor of 80 μK for measuring temperature difference is achieved in the side-of-fringe, Constant Power Mode measurement.

  • ultra sensitive chip based photonic temperature sensor using ring resonator structures
    arXiv: Optics, 2013
    Co-Authors: Mohammad Hafezi, Jingyun Fan, Jacob M Taylor, Gregory F Strouse, Zeeshan Ahmed
    Abstract:

    Resistance thermometry provides a time-tested method for taking temperature measurements. However, fundamental limits to resistance-based approaches has produced considerable interest in developing photonic temperature sensors to leverage advances in frequency metrology and to achieve greater mechanical and environmental stability. Here we show that silicon-based optical ring resonator devices can resolve temperature differences of 1 mK using the traditional wavelength scanning methodology. An even lower noise floor of 80 microkelvin for measuring temperature difference is achieved in the side-of-fringe, Constant Power Mode measurement.