公开(公告)号：US20190339117A1

公开(公告)日：2019-11-07

申请号：US16338500

申请日：2017-10-02

Applicant: Elbit Systems Land and C4I Ltd. ,  Soreq Nuclear Research Center

Inventor： Dan NUSSINSON ,  Aner LEV ,  David KARL

IPC: G01H9/00

Abstract: Systems and methods are provided, which use at least two coherent light sources with known phase relations between them, which are configured to illuminate a target with at least two corresponding spots, an optical unit comprising a mask and configured to focus, onto a sensor, interfered scattered illumination from the spots of the target, passing through the mask, to yield a signal, at least one shifter configured to shift a frequency of at least one of the coherent light sources to provide a carrier frequency in the signal, and a processing unit configured to derive a vibration frequency of the target from the sensor signal with respect to the carrier frequency. The vibration frequency of the target is separated from the carrier frequency and speckle disturbances may be attenuated or avoided.

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.