LIDAR imaging system including FMCW-type heterodyne detection of reference signal phase correction device

A technology of imaging system and reference signal, applied in the field of LIDAR imaging system

Pending Publication Date: 2022-07-01
COMMISSARIAT A LENERGIE ATOMIQUE ET AUX ENERGIES ALTERNATIVES
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Problems solved by technology

[0014] However, the spatial intensity distribution of the backscattered object signal may have laser granularity or speckle grains and thus a speckle pattern

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  • LIDAR imaging system including FMCW-type heterodyne detection of reference signal phase correction device
  • LIDAR imaging system including FMCW-type heterodyne detection of reference signal phase correction device
  • LIDAR imaging system including FMCW-type heterodyne detection of reference signal phase correction device

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Embodiment Construction

[0068] In the drawings and throughout the remainder of this specification, the same reference numbers refer to the same or similar elements. Also, various elements are not shown in order to improve the clarity of the drawings. Furthermore, the various embodiments and variations are not mutually exclusive, but may be combined. The terms "approximately", "approximately" and "about" refer to a difference of up to 10%, preferably a difference of up to 5%, unless otherwise stated. Also, the term "range from ... to ..." and equivalent terms are meant to include the limit unless otherwise stated.

[0069] The present invention relates to a LIDAR imaging system with frequency modulated continuous wave (FMCW) type heterodyne detection. It can be made in a free space optical configuration and / or a guided optical configuration.

[0070] This imaging system is called a "LIDAR" (Light Detection and Ranging) system because it is adapted to provide a map (or range image) of the distance t...

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Abstract

The invention relates to a LIDAR imaging system of the FMCW type comprising a light source (10), an optical projection device (20), an optical transmission device (30), an optical imaging device (40), and a matrix light detector (50). It further comprises a phase correction device (60) comprising a spatial phase modulator (61) for applying a corrected spatial phase distribution to the reference signal, and a calculation unit (62) for determining the corrected spatial phase distribution by taking into account a spatial distribution representative of a spatial intensity distribution of the backscatter object signal, the reference signal has a modified spatial intensity distribution in the reception plane, which optimizes the spatial distribution of the parameter of interest representative of the heterodyne signal.

Description

technical field [0001] The field of the invention is that of LIDAR imaging systems with frequency modulated continuous wave (FMCW) heterodyne detection. Background technique [0002] A LIDAR imaging system with FMCW type heterodyne detection enables obtaining a distance map of the illuminated scene. For this purpose, Aflatouni et al., entitled Nanophotonic coherent imager, Otp. Express 23(4), 5117-5125 (2015), describe an imaging system of this type, which is suitable for illuminating the entire scene at once and determining the Distance map of the lighting scene. [0003] Such imaging systems are based on the principle of heterodyne detection, ie using a heterodyne signal formed by the interaction between a reference signal and a signal backscattered by the scene. The two optical signals are coherent and originate from the same optical signal, called the primary signal, transmitted by the optical source. [0004] More specifically, such imaging systems include: [0005]...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01S17/894G01S7/491G01S7/4911
CPCG01S17/894G01S7/491G01S7/4911G01S17/34G01S17/36G01S7/4917G01S7/4914G01S7/4811G01S7/4814G01S7/4816G01S7/4818G01S7/497G01S7/4817
Inventor 阿妮斯·达米劳伦·弗雷
Owner COMMISSARIAT A LENERGIE ATOMIQUE ET AUX ENERGIES ALTERNATIVES
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