公开(公告)号：US20240004043A1

公开(公告)日：2024-01-04

申请号：US18267762

申请日：2021-12-10

Applicant: THALES

Inventor： Patrick FENEYROU ,  Jérôme BOURDERIONNET ,  Daniel DOLFI

IPC: G01S7/4912 ,  G01S17/34 ,  G01S17/58 ,  G01S7/481

CPC classification number: G01S7/4917 ,  G01S17/34 ,  G01S17/58 ,  G01S7/4811

Abstract: A method for processing a signal from a coherent lidar comprising a periodically frequency-modulated coherent source (L), the method includes the following steps: A decomposing each modulation period indexed j into a plurality of intervals indexed i, and determining, for each interval Iij, an elementary power spectral density DSP(i,j) of the beat signal over the interval, B determining an average power spectral density over j DSP(i), C determining a lower frequency bound of the average power density DSP(i) and an upper frequency bound, D determining a distance dk(i) and a velocity of the fluid vk(i) from the lower and upper bounds.

公开(公告)号：US20160282150A1

公开(公告)日：2016-09-29

申请号：US15033424

申请日：2014-11-14

Applicant: THALES ,  CENTRE NATIONAL DE LA RECHERCHE SCIENTIFIQUE

Inventor： Umberto BORTOLOZZO ,  Jean-Pierre HUIGNARD ,  Stefania RESIDORI ,  Stéphanie MOLIN ,  Daniel DOLFI

IPC: G01D5/353 ,  G01H9/00 ,  G01B9/02

CPC classification number: G01D5/35306 ,  G01B9/02049 ,  G01H9/004

Abstract: An optical fiber sensor for locating an excitation in proximity to an optical fiber assembly comprises: a laser assembly configured to emit N laser beams indexed i with N>1, of respective emission wavelength λi, an optical fiber assembly comprising N successive sections indexed i, an optical system configured to: inject the laser beams, receive N signal beams indexed i respectively of wavelengths λi, generate N reference beams indexed i respectively of wavelengths λi, produce N interference areas indexed i, a holographic detector comprising: a liquid crystal light valve that it at least partially covers the interference areas, and is configured to produce N holograms indexed i from, respectively, N interference areas, at least one optical detector configured to detect N output optical signals indexed I, a processing unit adapted to identify the section of the fiber assembly situated in proximity to the excitation to be located.

Abstract translation: 一种用于定位靠近光纤组件的激励的光纤传感器包括：激光器组件，被配置为发射N个分别具有N≥1的发射波长λi的i个激光束，包括索引i的N个连续部分的光纤组件， 一种光学系统，被配置为：注入激光束，分别接收波长λi分别指定的N个信号光束，产生分别为波长λi的索引i的N个参考光束，产生N个被索引的干扰区域i，全息检测器，包括：液晶光阀 其至少部分地覆盖干扰区域，并且被配置为从N个干扰区域分别产生N个全息图，至少一个光学检测器被配置为检测N个被索引的输出光信号I，处理单元，其适于识别部分 位于靠近要定位的激发的纤维组件。

公开(公告)号：US20180003551A1

公开(公告)日：2018-01-04

申请号：US15541332

申请日：2016-01-08

Applicant: THALES ,  CENTRE NATIONAL DE LA RECHERCHE SCIENTIFIQUE ,  UNIVERSITE NICE SOPHIA-ANTIPOLIS

Inventor： Jean-Pierre HUIGNARD ,  Umberto BORTOLOZZO ,  Daniel DOLFI ,  Stéphanie MOLIN ,  Arnaud PEIGNE ,  Stefania RESIDORI

IPC: G01H9/00 ,  G01D5/26 ,  G01D5/353

CPC classification number: G01H9/004 ,  G01D5/268 ,  G01D5/35303 ,  G01D5/35316 ,  G01D5/35345 ,  G01D5/35361 ,  G01D5/35364

Abstract: A fiber optic sensor for detecting an excitation in proximity to a fiber optic assembly, the excitation inducing a modulation of the phase of an optical signal propagating in the fiber optic assembly, the sensor comprises: a laser assembly emitting at least one laser beam; a fiber optic assembly; an optical system configured to: inject at least one portion of the laser beam; generate at least one laser signal beam issued from the laser beam injected into and propagated in the fiber assembly; generate at least one reference beam from the laser beam or the signal beam; produce at least one interference zone corresponding to the interference between a portion of the reference beam and a portion of the interference signal beam corresponding to the interference between a portion of the reference beam and a portion of the signal beam; a digital holography assembly comprising: a liquid-crystal spatial light modulator; a video camera configured to receive the interference zone and to transcribe it electrically to the liquid-crystal spatial light modulator in order to create thereon a phase hologram corresponding thereto; at least one optical detector configured to detect an output optical signal beam.

公开(公告)号：US20210058033A1

公开(公告)日：2021-02-25

申请号：US16756799

申请日：2018-10-17

Applicant: THALES ,  CENTRE NATIONAL DE LA RECHERCHE SCIENTIFIQUE ,  UNIVERSITÉ DE PARIS 7

Inventor： Daniel DOLFI ,  Sylvain COMBRIE ,  Loic MORVAN ,  Remy BRAIVE ,  Isabelle ROBERT ,  Jean-Charles BEUGNOT ,  Sarah BENCHABANE ,  Vincent LAUDE

IPC: H03B17/00 ,  H01L41/113 ,  H01L41/047 ,  G02F1/21

Abstract: This oscillator comprises: a source generating an incident optical wave at a pulsation frequency ω; an optomechanical resonator, having optical resonances at the pulsation frequency ω and mechanical resonances at a frequency f1 and generating, from the incident optical wave, emergent optical waves at the pulsation frequencies ω and ω−2πf1, and an acoustic wave at frequency f1; and, a photodiode delivering a useful signal at frequency f1 from the emergent waves. This oscillator further comprises: an acoustic propagation means for propagating the acoustic wave over a distance in order to produce a delayed acoustic wave; a means for converting the delayed acoustic wave into a delay signal at the frequency f1; and, a control loop, processing the delay signal in order to obtain a control signal applied to the source.

公开(公告)号：US20180058956A1

公开(公告)日：2018-03-01

申请号：US15560474

申请日：2016-03-17

Applicant: THALES ,  CENTRE NATIONAL DE LA RECHERCHE SCIENTIFIQUE ,  UNIVERSITE NICE SOPHIA-ANTIPOLIS

Inventor： Stéphanie MOLIN ,  Martine DOISY ,  Arnaud PEIGNE ,  Stefania RESIDORI ,  Umberto BORTOLOZZO ,  Jean-Pierre HUIGNARD ,  Renaud BOUFFARON ,  Daniel DOLFI

IPC: G01L1/24 ,  G01D5/353

CPC classification number: G01L1/242 ,  G01D5/353 ,  G01D5/35306 ,  G01H9/004

Abstract: A distributed optical fiber sensor of dynamic stress state comprises: an optical assembly configured to generate a series of optical pulses; an optical fiber of optical length L; an optical system configured to: inject through the first end at least the series of optical pulses; receive at the level of the end at least one series of output optical pulses, arising from the input pulses after propagation and retro-propagation in the fiber; generate at least one continuous reference beam or reference optical pulses on the basis of the optical assembly or of output optical pulses; produce a series of interference zones corresponding to the interference between the reference beam or a reference pulse and a signal optical pulse arising from an output optical pulse; a holographic detector comprising: a liquid-crystal light valve, the valve disposed so that it at least partially covers the interference zones, and producing holograms on the basis of the interference zones; at least one optical detector configured to detect output optical signals diffracted by the holograms.