公开(公告)号：US20210055412A1

公开(公告)日：2021-02-25

申请号：US16992490

申请日：2020-08-13

Applicant: INSTITUT NATIONAL D'OPTIQUE

Inventor： Simon TURBIDE ,  Linda MARCHESE

IPC: G01S13/90

Abstract: A method and a system for detection and synthetic aperture (SA) imaging of a target are disclosed. The method may include illuminating a scene with a search signal transmitted from a moving platform, receiving a search return signal from a target present in the scene, and estimating, from the search return signal, the range and the angular location of the target. The method may also include generating an SA transmission signal and a local oscillator (LO) signal with a time delay therebetween based on the estimated range, and illuminating the scene with the SA transmission signal pointed along an imaging direction based on the estimated angular location of the target. The method may further include receiving an SA return signal from the target, mixing the SA return signal with the LO signal to generate SA signal data, and generating an SA image of the target from the SA signal data.

公开(公告)号：US20220390590A1

公开(公告)日：2022-12-08

申请号：US17776023

申请日：2020-11-12

Applicant: INSTITUT NATIONAL D'OPTIQUE

Inventor： Linda MARCHESE ,  Alain BERGERON ,  Marc TERROUX ,  Michel DOUCET ,  François BERTHIAUME ,  Martin BRIAND ,  Mélanie LECLERC ,  Fabien CLAVEAU

IPC: G01S13/88 ,  G01S13/89 ,  G01S7/03

Abstract: There is described a terahertz (THz) imaging device and method for imaging an object hidden underneath clothing. The THz imaging device is generally configured for illuminating a region of clothing with a THz illumination beam, collecting a return optical beam reflected from the region of clothing in response to the illumination, generating a THz image based on the collected return optical beam, and tracking a position and orientation of the THz imaging device as the THz image is generated. A plurality of complementary THz images are generated by repeating the steps of illuminating, collecting, generating and tracking for a plurality of points of view of the THz imaging device relative to the clothing. By registering these THz images to one another in a common coordinate system based on the tracked position and orientation, the THz imaging device can output a composite THz image representing the hidden object, if any.

公开(公告)号：US20170184865A1

公开(公告)日：2017-06-29

申请号：US15390081

申请日：2016-12-23

Applicant: INSTITUT NATIONAL D'OPTIQUE

Inventor： Michel DOUCET ,  Alain BERGERON ,  Linda MARCHESE

IPC: G02B27/09 ,  G02B26/08 ,  G02B27/00 ,  G02B5/09

CPC classification number: G02B27/0927 ,  G02B5/0221 ,  G02B5/09 ,  G02B26/0816 ,  G02B27/0012 ,  G02B27/0983 ,  G02B27/48

Abstract: A beam conditioning device includes a coherence-breaking module and a beam transforming module. The coherence-breaking module is configured to break a spatial coherence between beam components of the light beam and may include coherence-breaking mirrors having a structured pattern on their reflective surfaces. The beam transforming module may include a primary optical element and a secondary optical element and is configured to transform the spatial energy distribution and the footprint of the light beam. The beam conditioning device may be used to transform a Gaussian light beam into a flat-top light beam suitable for terahertz imaging applications, although other initial and/or final energy distributions may be considered.