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.

公开(公告)号：US20220342110A1

公开(公告)日：2022-10-27

申请号：US17667869

申请日：2022-02-09

Applicant: ELBIT SYSTEMS LAND AND C4I LTD.

Inventor： Aner LEV ,  Shai Mordechai BUTZIN ,  Barak ALFASSI ,  Alon Refael HEIMER

IPC: G01V8/26 ,  G01V11/00 ,  G01V1/34 ,  G01H9/00

Abstract: An optical seismic surveying system including, a multibeam laser source including a plurality of laser-sources, a Diffractive-Optical-Element (DOE), an imager and a processor. The laser-sources direct respective laser-beams toward a single common focal point. The DOE is located at a single common focal point and configured to split each laser-beam into a plurality of laser-beams, toward an instantaneous area of interest. The laser-beams impinging on the instantaneous area of interest produce a laser spot assemblage including a plurality of laser spots. The imager acquires a plurality of defocused images of speckle patterns produced by diffused reflections of the laser spots. The speckle pattern correspond to a respective laser spot and thus to a respective sensing point in the instantaneous area of interest. The processor determines a relative displacement between corresponding speckle patterns in sequential pairs of images and determines a respective time-signal for each sensing point representing vibrations thereat.

公开(公告)号：US20180168453A1

公开(公告)日：2018-06-21

申请号：US15578618

申请日：2016-05-30

Applicant: ELBIT SYSTEMS LAND AND C4I LTD.

Inventor： Ilya LEIZERSON ,  Barak ALFASSI

IPC: A61B5/00 ,  A61B7/00 ,  G02B27/48 ,  G01H9/00 ,  G01N21/47

CPC classification number: A61B5/0066 ,  A61B5/0064 ,  A61B5/7207 ,  A61B5/7435 ,  A61B7/00 ,  A61B8/08 ,  A61B2576/00 ,  G01H9/00 ,  G01H9/002 ,  G01N21/4788 ,  G01N2021/479 ,  G02B27/48 ,  G06T7/20 ,  G06T7/248 ,  G06T2207/30048 ,  G06T2207/30076

Abstract: A system for simultaneously detecting audio-characteristics within a body over multiple body surface locations comprising a coherent light source directing at least one coherent light beam toward the body surface locations, an imager acquiring a plurality of defocused images, each is of reflections of the coherent light beam from the body surface locations. Each image includes at least one speckle pattern, each corresponding to a respective coherent light beam and further associated with a time-tag. A processor, coupled with the imager, determines in-image displacements over time of each of a plurality of regional speckle patterns according to said acquired images. Each one of the regional speckle patterns is at least a portion of a respective speckle pattern. Each regional speckle pattern is associated with a respective different body surface location. The processor determines the audio-characteristics according to the in-image displacements over time of the regional speckle patterns.