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    TWO-STAGE PHOTO-ACOUSTIC EXCITATION SENSING SYSTEMS AND METHODS
    2.
    发明申请
    TWO-STAGE PHOTO-ACOUSTIC EXCITATION SENSING SYSTEMS AND METHODS 有权

    公开(公告)号：US20210116358A1

    公开(公告)日：2021-04-22

    申请号：US17137393

    申请日：2020-12-30

    Applicant: Elbit Systems Land and C4I Ltd.

    Inventor： Ilya LEIZERSON ,  Adi Yosef Mordechai SUSSHOLZ ,  David STAVITSKY

    IPC: G01N21/17 ,  G01N29/24 ,  G01N21/55 ,  G06T7/00 ,  G06T7/246 ,  G06T7/521 ,  G06T7/13

    Abstract: A system and a method for sensing an object using two-stage photo-acoustic excitation are provided herein. The method may include: scanning the object at a first resolution by alternately and repeatedly photo-acoustically exciting and sensing each of multiple first regions on the object to yield multiple first outputs; determining, based on the multiple first outputs, at least one first region of the multiple first regions that includes at least one zone and a specific depth of the at least one zone below a surface of the object; scanning the first region that includes the at least one zone at a second resolution by alternately and repeatedly photo-acoustically exciting and sensing each of multiple second regions in the at least one first region thereof to yield multiple second outputs; and determining, based on at least one of the multiple second outputs, specified parameters of the at least one zone.

    PHOTOACOUSTIC EXCITATION SENSING ENHANCED BY CROSS-CORRELATED UNFOCUSED SPECKLE IMAGES
    3.
    发明申请
    PHOTOACOUSTIC EXCITATION SENSING ENHANCED BY CROSS-CORRELATED UNFOCUSED SPECKLE IMAGES 审中-公开

    公开(公告)号：US20200371018A1

    公开(公告)日：2020-11-26

    申请号：US16636963

    申请日：2018-08-06

    Applicant: Elbit Systems Land and C4I Ltd.

    Inventor： Ilya LEIZERSON ,  Barak ALFASSI ,  Alon HEIMER ,  Sharone ALONI ,  Adam WOLFF

    IPC: G01N21/17 ,  G01H9/00

    Abstract: A method and a system for photoacoustic inspection of a part are provided herein. The method may include the following steps: photo-acoustically exciting a predetermined position in a predetermined region on a part by pulsed laser illumination, to yield ultrasonic excitation of the part; coherently illuminating a predetermined location in the predetermined region on the part; detecting an illumination scattered from the predetermined location; determining, based on the scattered illumination, a plurality of sequence of two or more temporally-sequential de-focused speckle pattern images, wherein each of the sequences corresponds to one of the predetermined illuminated locations; and determining a set of translations, each determined based on the sequences, wherein each translation in the set is determined based on two temporally-sequential speckle patterns images in the respective sequence.

    OPTICAL DETECTION OF VIBRATIONS
    5.
    发明申请
    OPTICAL DETECTION OF VIBRATIONS 审中-公开

    公开(公告)号：US20190212187A1

    公开(公告)日：2019-07-11

    申请号：US16326951

    申请日：2017-08-28

    Applicant: Elbit Systems Land and C4I Ltd.

    Inventor： Ilya LEIZERSON ,  Dan NUSSINSON

    IPC: G01H9/00 ,  G01B9/02

    CPC classification number: G01H9/002 ,  G01B9/02084 ,  G01B9/02094

    Abstract: Systems and methods are provided for vibrations detection in a scene. Systems comprise at least one coherent light source configured to illuminate the scene, an optical unit configured to focus scattered light from the scene onto a pixelated detector, the detector configured to provide pixel intensity signals, and a processing unit configured to analyze the pixel intensity signals over the pixels of the detector to derive a vibration spectrum of elements in the scene that correspond to the pixels. The signal modulation at each pixel may be used to indicate the vibrations of the scene element(s) that corresponds to the pixel(s). Vibration information concerning the scene may be used to direct other methods of vibration measurements, such as speckle interferometry, according to derived vibration images of the scene.

    SYSTEM FOR OBJECT AUTHENTICITY DETECTION INCLUDING A REFERENCE IMAGE ACQUISITION MODULE AND A USER MODULE AND METHODS THEREFOR
    6.
    发明申请
    SYSTEM FOR OBJECT AUTHENTICITY DETECTION INCLUDING A REFERENCE IMAGE ACQUISITION MODULE AND A USER MODULE AND METHODS THEREFOR 审中-公开

    公开(公告)号：US20190026581A1

    公开(公告)日：2019-01-24

    申请号：US15763804

    申请日：2017-05-24

    Applicant: ELBIT SYSTEMS LAND AND C4I LTD.

    Inventor： Ilya LEIZERSON

    IPC: G06K9/20 ,  G02B27/10 ,  G06T7/00 ,  G01N21/47

    Abstract: A system for determining the authenticity of an object including a reference-image acquisition module for acquiring a reference-image. The reference-image acquisition module includes a light-source, an imager including an imaging-sensor, and a database coupled with the imager for storing the reference-image. The light-source directs circumferential-light toward an authentication-region on the object. The circumferential-light is at least one of collimated and telecentric. The circumferential-light impinges on the authentication-region from a plurality of different azimuthal directions and at a predetermined oblique angle relative to the normal of a plane defined by said object. A portion of the circumferential-light is reflected from the authentication-region toward a specular reflection region and another portion is scattered from the authentication-region. The imager is focused on the authentication-region and acquires a reference-image. The reference-image is a focused image of the scattered light. The reference-image includes image features related to surface features scattering phenomena of the authentication-region.

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