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公开(公告)号：US11523737B2
公开(公告)日：2022-12-13
申请号：US16443665
申请日：2019-06-17
Applicant: ELBIT SYSTEMS LAND AND C4I LTD
Inventor： Ilya Leizerson , Barak Alfassi
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.
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公开(公告)号：US10321825B2
公开(公告)日：2019-06-18
申请号：US15578618
申请日：2016-05-30
Applicant: ELBIT SYSTEMS LAND AND C4I LTD
Inventor： Ilya Leizerson , Barak Alfassi
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.
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公开(公告)号：US11692810B2
公开(公告)日：2023-07-04
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
CPC classification number: G01B9/02094 , G01H9/008 , G01N21/1702 , G01N21/88 , G01N29/2418 , G01N2021/1706 , G01N2021/479 , G01N2201/0697 , G01N2201/06113 , G01N2291/0289
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.
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公开(公告)号：US11921254B2
公开(公告)日：2024-03-05
申请号：US17667869
申请日：2022-02-09
Inventor： Aner Lev , Shai Mordechai Butzin , Barak Alfassi , Alon Refael Heimer
CPC classification number: G01V8/26 , G01H9/002 , G01V1/34 , G01V11/00 , G01V2210/74
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.
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