The Experts below are selected from a list of 216 Experts worldwide ranked by ideXlab platform

L H Ford - One of the best experts on this subject based on the ideXlab platform.

  • vacuum fluctuations and brownian motion of a charged test particle near a Reflecting boundary
    Physical Review D, 2004
    Co-Authors: L H Ford
    Abstract:

    We study the Brownian motion of a charged test particle coupled to electromagnetic vacuum fluctuations near a perfectly Reflecting Plane boundary. The presence of the boundary modifies the quantum fluctuations of the electric field, which in turn modifies the motion of the test particle. We calculate the resulting mean squared fluctuations in the velocity and position of the test particle. In the case of directions transverse to the boundary, the results are negative. This can be interpreted as reducing the quantum uncertainty which would otherwise be present.

Mary Ann Weitnauer - One of the best experts on this subject based on the ideXlab platform.

  • robust uwb localization of a Reflecting Plane using multi path delay
    Vehicular Technology Conference, 2018
    Co-Authors: Seonwoo Lee, Mary Ann Weitnauer
    Abstract:

    In this paper we present an improved algorithm for localizing a single planar reflective surface using ultra wide band radios that measure excess delay of the first multipath component. These radios do not require time synchronization and cannot measure angle of arrival. Simulation results show that the proposed method outperforms the existing state of the art method. Experimental results confirm the practically of the proposed method.

  • VTC-Fall - Robust UWB Localization of a Reflecting Plane Using Multi-Path Delay
    2018 IEEE 88th Vehicular Technology Conference (VTC-Fall), 2018
    Co-Authors: Seonwoo Lee, Mary Ann Weitnauer
    Abstract:

    In this paper we present an improved algorithm for localizing a single planar reflective surface using ultra wide band radios that measure excess delay of the first multipath component. These radios do not require time synchronization and cannot measure angle of arrival. Simulation results show that the proposed method outperforms the existing state of the art method. Experimental results confirm the practically of the proposed method.

Trevor Rayment - One of the best experts on this subject based on the ideXlab platform.

R Pierri - One of the best experts on this subject based on the ideXlab platform.

  • On the effect of mirroring in inverse source
    Imaging and Applied Optics 2016, 2016
    Co-Authors: Maria Antonia Maisto, Raffaele Solimene, R Pierri
    Abstract:

    In this paper the inverse source problem in presence of a Reflecting Plane is dealt with for a two-dimensional configuration and bounded rectilinear strip sources. The case of orthogonal (to a perfect electric conductor Plane) source is considered. Analytical arguments are developed to estimate the singular value decomposition of the pertinent radiation operator. This allows to highlight the role played by the distance from the prefect electric conductor Plane on the so-called number of degrees of freedom of the radiated field as well as on theachievable resolution while reconstructing the unknown sources.

  • Inverse scattering in the presence of a Reflecting Plane
    Journal of Optics, 2015
    Co-Authors: Raffaele Solimene, Maria Antonia Maisto, R Pierri
    Abstract:

    The role played by a Reflecting Plane embedded in the host medium in inverse scattering problems is dealt with for a scalar two dimensional configuration. To accomplish such a task, analytical arguments are developed to estimate the singular value decomposition (SVD) of the relevant scattering operator. This allows us to gather quantitative measures of the information that can be conveyed back from data to the unknown, to determine the so-called number of degrees of freedom (NDF) and to estimate the achievable resolution. The analysis highlights that the presence of reflections or scattering positively impacts the inverse scattering problem.

  • inverse source in the presence of a Reflecting Plane for the strip case
    Journal of The Optical Society of America A-optics Image Science and Vision, 2014
    Co-Authors: Raffaele Solimene, Maria Antonia Maisto, R Pierri
    Abstract:

    In this paper the inverse source problem in the presence of a Reflecting Plane is dealt with for a two-dimensional configuration and bounded rectilinear strip sources. The cases of both orthogonal and parallel (to the Reflecting Plane) sources are considered. Analytical arguments are developed to estimate the singular value decomposition of the pertinent radiation operator. This allows highlighting of the role played by the Reflecting Plane in the so-called number of degrees of freedom of the radiated field as well as in the achievable resolution while reconstructing the unknown sources.

Jing Wenqian - One of the best experts on this subject based on the ideXlab platform.

  • Optimization of Equivalent Source Configuration for an Independent-Equivalent Source Method in Half-Space Sound Field
    Shock and Vibration, 2020
    Co-Authors: Jing Wenqian, Wu Huawei, Nie Jinquan
    Abstract:

    In the situation that vibrating objects are located above a Reflecting Plane, an independent-equivalent source method (I-ESM) regards the reflections due to the Plane as being radiated by equivalent sources placed under the Plane and then the half-space sound field is reconstructed by matching the measured pressure with the equivalent sources distributed within the vibrating object and those substituting for reflections. But, this method heavily depends on the equivalent source configuration and may obtain bad reconstruction results if the equivalent sources are arranged incorrectly. This paper deals with the optimization of the equivalent source configuration to ensure I-ESM always perform well. Through numerical simulations and experiments, the influence of equivalent source configurations on the reconstruction accuracy was studied and optimal configurations were acquired and confirmed.

  • Reconstruction of the sound field above a Reflecting Plane using the equivalent source method
    Journal of Sound and Vibration, 2017
    Co-Authors: Jing Wenqian, Yong-bin Zhang, Wang-lin Lin
    Abstract:

    Abstract In practical situations, vibrating objects are usually located above a Reflecting Plane instead of exposing to a free field. The conventional nearfield acoustic holography (NAH) sometimes fails to identify sound sources under such situations. This paper develops two kinds of equivalent source method (ESM)-based half-space NAH to reconstruct the sound field above a Reflecting Plane. In the first kind of method, the half-space Green's function is introduced into the ESM-based NAH, and the sound field is reconstructed based on the condition that the surface impedance of the Reflecting Plane is known a prior . The second kind of method regards the reflections as being radiated by equivalent sources placed under the Reflecting Plane, and the sound field is reconstructed by matching the pressure on the hologram surface with the equivalent sources distributed within the vibrating object and those substituting for reflections. Thus, this kind of method is independent of the surface impedance of the Reflecting Plane. Numerical simulations and experiments demonstrate the feasibility of these two kinds of methods for reconstructing the sound field above a Reflecting Plane.