OCEAN CURRENT DETECTION DEVICE AND METHOD BASED ON DOUBLE-HELIX AND DOUBLE-CORE VIBRATION FIBER-OPTIC CABLE

    公开(公告)号:US20240353441A1

    公开(公告)日:2024-10-24

    申请号:US18349384

    申请日:2023-07-10

    IPC分类号: G01P5/26 G01P13/02

    CPC分类号: G01P5/26 G01P13/02

    摘要: An ocean current detection device and method based on double-helix and double-core vibration fiber-optic cable, comprises a double-core fiber-optic cable and a φ-OTDR system; the double-core fiber-optic cable comprises a first and a second optical fiber core, provided symmetrically in the double helix structure. The terminate ends of the first and the second optical fiber core are connected, and the start end of the first or the second optical fiber core is connected with the φ-OTDR system. When measuring the ocean current characteristics in the target sea area, the double-core fiber-optic cable is provided underwater to generate vortex-induced vibration. The φ-OTDR system is provided for emitting laser towards the cable, receiving returned double-core vibration signals, extracting vibration characteristics from the double-core vibration signals to determine ocean current characteristics, including ocean current flow velocity and direction, to improve the detection accuracy.

    FLUID FLOW SENSOR
    3.
    发明公开
    FLUID FLOW SENSOR 审中-公开

    公开(公告)号:US20240159602A1

    公开(公告)日:2024-05-16

    申请号:US18055548

    申请日:2022-11-15

    申请人: FLUSSO LIMITED

    摘要: A sensor for sensing direction of fluid-flow, the sensor comprising: a heating element; a first active temperature sensing element; and a processor; wherein the processor is configured to: receive a first signal corresponding to a first sensed temperature from the first active temperature sensing element; and determine a direction of fluid-flow based on a difference between the first sensed temperature and a threshold value. A method for sensing direction of fluid-flow and a method for manufacturing a sensor are also described.

    Ferromagnetic sensing
    8.
    发明授权

    公开(公告)号:US11550074B2

    公开(公告)日:2023-01-10

    申请号:US16941942

    申请日:2020-07-29

    申请人: Metrasens Limited

    摘要: An apparatus including two or more spaced apart ferromagnetic sensors arranged to detect and screen ferromagnetic objects, and, when a ferromagnetic object is detected, the screening is configured to be substantially independent of the sensor-object distance.

    METHOD AND SYSTEM FOR ESTIMATING AERODYNAMIC ANGLES OF A FLYING BODY

    公开(公告)号:US20230003758A1

    公开(公告)日:2023-01-05

    申请号:US17777082

    申请日:2021-01-11

    摘要: A computer implemented method for estimating angles of attack and/or an angle of sideslip of a flying body includes the steps of: providing data or measurements representative of a time derivative of a module of a speed of the flying body with respect to an air; providing data or measurements representative of corresponding projections of coordinate accelerations on a Cartesian reference frame fixed to the flying body; and calculating the angles of attack and/or the sideslip on a basis of an mathematical relationship of the angles of attack and the sideslip with the coordinate accelerations and the time derivative of the module of the speed of the flying body with respect to the air.