Apparatus and method for scanning a structure

    公开(公告)号:US10697905B2

    公开(公告)日:2020-06-30

    申请号:US15558377

    申请日:2016-03-17

    摘要: A subsea apparatus and method for scanning a subsea structure to detect differences in density between different parts of the subsea structure is described. A source of gamma radiation and a plurality of detectors arranged to detect gamma radiation emitted by the source are provided. The subsea structure is positioned between the source and the detectors, and the detectors and the source rotated in a fixed relationship to each other about an axis of rotation located between the detectors and the source. The plurality of detectors are arranged in a linear array, the linear array being substantially parallel to the axis of rotation. A pixelated detector array and a source container are also disclosed.

    Oxidation catalyst for diesel engines

    公开(公告)号:US10562013B2

    公开(公告)日:2020-02-18

    申请号:US15505436

    申请日:2015-08-07

    摘要: This oxidation catalyst for diesel engines is divided into an upstream-side catalyst layer and a downstream-side inner catalyst layer in the flow direction of the exhaust gas, and a downstream-side outer catalyst layer is additionally formed so as to cover the surface of the downstream-side inner catalyst layer. The upstream-side catalyst layer and the downstream-side inner catalyst layer contain Pd, and the downstream-side outer catalyst layer contains Pt. The amounts of Pt and Pd contained in the upstream-side catalyst layer and the amounts of Pt and Pd contained in the downstream-side inner catalyst layer are constantly set to certain values, while the amount of Pt contained in the downstream-side outer catalyst layer is set to a value which enables the oxidation efficiency to be at a predetermined value or higher.

    Apparatus and method for scanning a structure, and collimator therefor

    公开(公告)号:US10451569B2

    公开(公告)日:2019-10-22

    申请号:US15301519

    申请日:2015-03-31

    IPC分类号: G01N23/00 G01N23/18

    摘要: An apparatus for scanning a structure to detect density differences between different structure parts, the apparatus includes a source of gamma radiation, a plurality of first detectors arranged to detect radiation emitted by the source along a plurality of respective first paths, a plurality of second detectors arranged to detect radiation emitted by the source along a plurality of respective second paths. Each first and second path is substantially aligned with a respective radius of a circle centered on the source, and an angular separation between at least two neighboring first paths is S. The first and second detectors and the source are arranged for rotation in a fixed relationship with respect to each other, about an axis of rotation located between the source and detectors, wherein the axis of rotation is substantially orthogonal to the circle. An asymmetric collimator block directs gamma radiation from the source to the detectors.