Method for calibrating a THz measuring apparatus, THz measuring method and corresponding THz measuring apparatus

    公开(公告)号:US12216050B2

    公开(公告)日:2025-02-04

    申请号:US17602578

    申请日:2020-04-09

    Inventor: Roland Böhm

    Abstract: The invention relates to a method for calibrating a THz measuring apparatus (8), in particular a pipe, on a measurement object (10), comprising at least the following steps: providing a THz measuring apparatus (8) having a plurality of pivotable THz sensors (1), arranged in a circumferential direction around a measuring chamber (9), for outputting one THz transmitted beam (12) each along a sensor axis (B) (provision step); orienting the THz sensors (1) into a starting position in the measuring chamber (9) in which the measurement object (10) is received (orientation step in starting position); allocating the THz sensors (1) to at least one first and one second sensor group (group formation step); first calibration adjustment step, in which the second sensor group is adjusted as an adjustment group by means of the first sensor group as a starting group, and corresponding second calibration adjustment step, in which the first sensor group is adjusted as an adjustment group by means of the previously calibration-adjusted second sensor group as a starting group; wherein, in each of the calibration adjustment steps=by means of the THz sensors (S1, S3, S5, S7) of the starting group, spacing points on a surface (10a) of the measurement object (10) are determined, =sensor correction angles of the THz sensors (1; S2, S4, S6, S8) of the adjustment group are determined by means of the spacing points determined by the starting group, and =the THz sensors of the adjustment group are calibration-adjusted about the determined sensor correction angles (a).

    Antenna ice loading sensor and method

    公开(公告)号:US11892561B2

    公开(公告)日:2024-02-06

    申请号:US17633830

    申请日:2020-08-10

    CPC classification number: G01S7/4039 G01B15/025 H01Q13/20

    Abstract: Disclosed herein is a system and method for determining a thickness of ice on Radio Frequency (RF) systems The system includes a sensor unit for use in determining the thickness of ice on a surface of a RADAR system having a RADAR antenna, the sensor unit including a sensor unit antenna tunable to a harmonic of a RADAR antenna signal, the harmonic having a frequency within an ice absorption band, wherein the sensor unit antenna emits the harmonic at a first signal strength; and, a sensor unit receiver communicatively coupled to the sensor unit antenna and configured to detect a second signal strength of the harmonic received by the sensor unit antenna.

    Laminate state calculation method, laminated state calculation apparatus, and laminated state calculation program

    公开(公告)号:US11644429B2

    公开(公告)日:2023-05-09

    申请号:US17241536

    申请日:2021-04-27

    CPC classification number: G01N23/04 G01B15/02

    Abstract: A method for calculating a laminate state of a CFRP laminate according to an embodiment includes acquiring a plurality of images of a cross section of the CFRP laminate orthogonal to a lamination direction by imaging the CFRP laminate with X-rays at a plurality of different positions in the lamination direction, the CFRP laminate including first layers including carbon fibers oriented in a first direction orthogonal to the lamination direction and second layers including carbon fibers oriented in a second direction orthogonal to the lamination direction and different from the first direction, and calculating a parameter correlated with a quantity of voids formed in the first layers and the second layers from the plurality of acquired images, and distinguishing between the first layers and the second layers using the calculated parameter.

    METROLOGY METHOD AND SYSTEM
    8.
    发明申请

    公开(公告)号:US20230074398A1

    公开(公告)日:2023-03-09

    申请号:US17947208

    申请日:2022-09-19

    Applicant: NOVA LTD.

    Abstract: A metrology method for use in determining one or more parameters of a patterned structure, the method including providing raw measured TEM image data, TEMmeas, data indicative of a TEM measurement mode, and predetermined simulated TEM image data including data indicative of one or more simulated TEM images of a structure similar to the patterned structure under measurements and a simulated weight map including weights assigned to different regions in the simulated TEM image corresponding to different features of the patterned structure, performing a fitting procedure between the raw measured TEM image data and the predetermined simulated TEM image data and determining one or more parameters of the structure from the simulated TEM image data corresponding to a best fit condition.

    MEASUREMENT OF METAL OR ALLOY COATING

    公开(公告)号:US20230018020A1

    公开(公告)日:2023-01-19

    申请号:US17756917

    申请日:2020-11-18

    Abstract: A method for measuring average thickness of a metal or alloy coating on a metal or alloy substrate using an X-ray fluorescence (XRF) spectrometer is used when the coating has an uneven surface at different distances from a measurement window of the XRF spectrometer. The method includes measuring elemental composition of the coating or substrate using the XRF spectrometer and obtaining the average thickness of the coating using a calibration relationship between coating thickness and elemental composition of the coating or substrate. The metal or alloy coating may be a metal or alloy coating of a plurality of outer armor wires wrapped around a cable. The method may be used to analyze coating thickness changes over time or along the length of the cable, or to analyze a corrosive environment in order to choose optimal material for a metal or alloy coating.

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