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    Method for obtaining a reference target with low monostatic RCS in a determined direction
    14.
    发明专利
    Method for obtaining a reference target with low monostatic RCS in a determined direction 未知

    公开(公告)号：GB2531939B

    公开(公告)日：2017-03-29

    申请号：GB201518726

    申请日：2015-10-22

    Applicant: COMMISSARIAT À L'ÉNERGIE ATOMIQUE ET AUX ÉNERGIES ALTERNATIVES

    Inventor： OLIVIER VACUS ,  CAROL SAINT-FLOUR

    IPC: G01S7/41 ,  G01S7/40 ,  G01S13/02

    Abstract: The invention relates to a reference target, and a method of obtaining such a target, having a small monostatic radar cross section (RCS) at a frequency of interest and in a determined direction. The reference target, which may be a sphere (100), has rotational invariance of 2π/N, wherein N is an integer such that N≥3, relatively to a rotational symmetry axis (Oz). The target has over at least part of its surface a one-dimensional grating of grooves (110) for which the periodicity is substantially less than the wavelength. The depth of the grooves is selected in order to cancel out the backscatter coefficient of an incident wave along the axis (Oz). The grooves may be parallel to one another and form a predetermined angle, such as a right angle, with the rotational symmetry axis (fig. 1), or they may be arranged in a radial direction (fig. 3). The target may have symmetry of revolution around the rotational symmetry axis. The target may be made in a PEC (perfect electrical conductor), typically a metal material, and the grooves may be filled with a dielectric material.

    Method for obtaining a reference target with low monostatic RCS in a determined direction
    16.
    发明专利
    Method for obtaining a reference target with low monostatic RCS in a determined direction 未知

    公开(公告)号：GB2531939A

    公开(公告)日：2016-05-04

    申请号：GB201518726

    申请日：2015-10-22

    Applicant: COMMISSARIAT À L'ÉNERGIE ATOMIQUE ET AUX ÉNERGIES ALTERNATIVES

    Inventor： OLIVIER VACUS ,  CAROL SAINT-FLOUR

    IPC: G01S7/41 ,  G01S7/40 ,  G01S13/02

    Abstract: The invention relates to a reference target, and a method of obtaining such a target, having a small monostatic radar cross section (RCS) at a frequency of interest and in a determined direction. The reference target, which may be a sphere (100), has rotational invariance of 2π/N, wherein N is an integer such that N≥3, relatively to a rotational symmetry axis (Oz). The target has over at least part of its surface a one-dimensional grating of grooves (110) for which the periodicity is substantially less than the wavelength. The depth of the grooves is selected in order to cancel out the backscatter coefficient of an incident wave along the axis (Oz). The grooves may be parallel to one another and form a predetermined angle, such as a right angle, with the rotational symmetry axis (fig. 1), or they may be arranged in a radial direction (fig. 3). The target may have symmetry of revolution around the rotational symmetry axis. The target may be made in a PEC (perfect electrical conductor), typically a metal material, and the grooves may be filled with a dielectric material.

    HEAT STORAGE TANK WITH IMPROVED THERMAL STRATIFICATION
    17.
    发明专利
    HEAT STORAGE TANK WITH IMPROVED THERMAL STRATIFICATION 未知

    公开(公告)号：ZA201408153B

    公开(公告)日：2015-11-25

    申请号：ZA201408153

    申请日：2014-11-07

    Applicant: COMMISSARIAT À L'ÉNERGIE ATOMIQUE ET AUX ÉNERGIES ALTERNATIVES

    Inventor： FOURMIGUE JEAN-FRANÇOIS ,  COUTURIER RAPHAËL ,  BRUCH ARNAUD

    Abstract: Heat storage tank comprising an envelope (2) with a longitudinal axis (X) filled with a heat transfer liquid and solid heat storage elements, a first longitudinal end provided with first means (10) for collecting and supplying a liquid at a first temperature and a second longitudinal end provided with second means (12) for collecting and supplying a liquid at a second temperature, in which said solid heat storage elements are distributed across three beds (TH1, TH2 and TH3) superposed along the longitudinal axis (X), separated by a layer of liquid (L1, L2 and L3), the heat transfer liquid being capable of flowing from the first longitudinal end to the second longitudinal end.

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