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公开(公告)号：US11099522B2
公开(公告)日：2021-08-24
申请号：US16499770
申请日：2018-03-30
申请人： CENTRE NATIONAL DE LA RECHERCHE SCIENTIFIQUE (CNRS) , ECOLE SUPÉRIEURE DE PHYSIQUE ET DE CHIMIE INDUSTRIELLES DE LA VILLE DE PARIS
摘要： According to one aspect, the invention concerns an optical imaging device (20) for an object (OBJ) by off-axis holography comprising a light source (21) adapted for emitting an illumination wave (EI) on the object, in transmission or reflection, and an assembly formed by one or more thick Bragg gratings (22) for receiving a wave (EO) coming from the object thus illuminated and for deflecting a first component (ER) of the wave coming from the object, called the reference wave, and to allow a second component (ES) of the wave coming from the object, called the signal wave, to pass without deflection in such a way that the deflected reference wave presents predetermined deflection angles with respect to the non-deflected signal wave defined in two perpendicular planes. The imaging device according to the first aspect further comprises a two-dimensional detection device (23) for acquiring an interferogram resulting from the interference between said deflected reference wave and said signal wave and a computing unit for determining, from said interferogram, an amplitude and phase distribution of the signal wave in the plane of the object (hologram).
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公开(公告)号：US20150292858A1
公开(公告)日：2015-10-15
申请号：US14442910
申请日：2013-11-15
发明人： Michael Atlan , Benjamin Samson
CPC分类号： G01B9/021 , G01N21/453 , G03H1/0005 , G03H1/0443 , G03H1/0866 , G03H2001/0033 , G03H2001/0456 , G03H2001/0463 , G03H2210/62 , G03H2227/03
摘要： The invention relates to a digital holography method for detecting the vibration amplitude of an object (15) having a vibration frequency ω, comprising: generating object illumination waves (Wt) and reference waves (WLO); acquiring interferograms between the reference wave (WLO) and a signal wave (W≯) by means of a bandwidth a s detector (19), the reference wave comprising two components ELO, ELO1 of frequencies ω1, ω2 that are respectively staggered in relation to the laser frequency ωL by a quantity δ1=γ1ω, and δ2=qω+γ2ωδ, where q is an integer and −0.5≦γ1, γ2≦0.5; and calculating the vibration amplitude of the object from the optical beats spectrum deduced from the complex amplitude of an interferogram.
摘要翻译： 本发明涉及一种用于检测具有振动频率ω的物体（15）的振幅的数字全息方法，包括：产生物体照射波（Wt）和参考波（WLO）; 通过作为检测器（19）的带宽，在参考波（WLO）和信号波（W≯）之间获取干涉图，该参考波包括频率ω1，ω2的两个分量EL0，ELO1，它们分别相对于 激光频率ωL乘以δ1=γ1ω，δ2=qω+γ2ωδ，其中q为整数，-0.5＆nlE;γ1，γ2＆nlE; 0.5; 并从干涉图的复振幅推导出的光拍频谱中计算物体的振幅。
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公开(公告)号：US11457806B2
公开(公告)日：2022-10-04
申请号：US16730555
申请日：2019-12-30
申请人： CENTRE NATIONAL DE LA RECHERCHE SCIENTIFIQUE (CNRS) , ECOLE SUPÉRIEURE DE PHYSIQUE ET DE CHIMIE INDUSTRIELLES DE LA VILLE DE PARIS , INSTITUT NATIONAL DE LA SANTE ET DE LA RECHERCHE MEDICALE (INSERM) , SORBONNE UNIVERSITE
发明人： Léo Puyo , Michael Atlan
摘要： According to a first aspect, the present disclosure relates to a digital holography device (100) for full-field blood flow imaging of ocular vessels of a field of view of a layer (11) of the eye (10). The device comprises an optical source (101) configured for the generation of an illuminating beam (Eobj) and a reference beam (ELO), and a detector (135) configured to acquire a plurality of interferograms (I(x,y,t)) wherein an interferogram is defined as the signal resulting from the interference between the said reference beam (ELO) and a part of said illuminating beam (Eobj) that is backscattered from said layer (11). The device further comprises a processing unit (150) configured for processing said plurality of interferograms, (I(x,y,t)), wherein said processing comprises: the calculation (202), for each interferogram, of a hologram (H(x,y,t)), resulting in a first plurality of holograms; the selection (203), in sequential time windows, (tw), of second pluralities of holograms; the calculation (204), for each said second plurality of holograms, of a Doppler power spectrum (S(x,y,f)); the calculation (205), based on said Doppler power spectrum, of at least a first Doppler image thus generating at least a first plurality of Doppler images; the processing of each first Doppler image, wherein said processing comprises the devignetting (206) of said first Doppler image, resulting in a devignetted first Doppler image; the normalization (207) of said devignetted first Doppler image based on a spatial average of an intensity of said first Doppler image, resulting in a normalized first Doppler image; and the subtraction (208), from said normalized first Doppler image, of said spatial average of said intensity of said first Doppler image, resulting in a corrected first Doppler image.
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公开(公告)号：US20200233378A1
公开(公告)日：2020-07-23
申请号：US16499770
申请日：2018-03-30
申请人： CENTRE NATIONAL DE LA RECHERCHE SCIENTIFIQUE (CNRS) , ECOLE SUPÉRIEURE DE PHYSIQUE ET DE CHIMIE INDUSTRIELLES DE LA VILLE DE PARIS
IPC分类号： G03H1/04
摘要： According to one aspect, the invention concerns an optical imaging device (20) for an object (OBJ) by off-axis holography comprising a light source (21) adapted for emitting an illumination wave (EI) on the object, in transmission or reflection, and an assembly formed by one or more thick Bragg gratings (22) for receiving a wave (EO) coming from the object thus illuminated and for deflecting a first component (ER) of the wave coming from the object, called the reference wave, and to allow a second component (ES) of the wave coming from the object, called the signal wave, to pass without deflection in such a way that the deflected reference wave presents predetermined deflection angles with respect to the non-deflected signal wave defined in two perpendicular planes. The imaging device according to the first aspect further comprises a two-dimensional detection device (23) for acquiring an interferogram resulting from the interference between said deflected reference wave and said signal wave and a computing unit for determining, from said interferogram, an amplitude and phase distribution of the signal wave in the plane of the object (hologram).
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公开(公告)号：US20210196120A1
公开(公告)日：2021-07-01
申请号：US16730555
申请日：2019-12-30
申请人： CENTRE NATIONAL DE LA RECHERCHE SCIENTIFIQUE (CNRS) , ECOLE SUPÉRIEURE DE PHYSIQUE ET DE CHIMIE INDUSTRIELLES DE LA VILLE DE PARIS , INSTITUT NATIONAL DE LA SANTE ET DE LA RECHERCHE MEDICALE (INSERM) , SORBONNE UNIVERSITE
发明人： Léo Puyo , Michael Atlan
摘要： According to a first aspect, the present disclosure relates to a digital holography device (100) for full-field blood flow imaging of ocular vessels of a field of view of a layer (11) of the eye (10). The device comprises an optical source (101) configured for the generation of an illuminating beam (Eobj) and a reference beam (ELO), and a detector (135) configured to acquire a plurality of interferograms (I(x,y,t)) wherein an interferogram is defined as the signal resulting from the interference between the said reference beam (ELO) and a part of said illuminating beam (Eobj) that is backscattered from said layer (11). The device further comprises a processing unit (150) configured for processing said plurality of interferograms, (I(x,y,t)), wherein said processing comprises: the calculation (202), for each interferogram, of a hologram (H(x,y,t)), resulting in a first plurality of holograms; the selection (203), in sequential time windows, (tw), of second pluralities of holograms; the calculation (204), for each said second plurality of holograms, of a Doppler power spectrum (S(x,y,f)); the calculation (205), based on said Doppler power spectrum, of at least a first Doppler image thus generating at least a first plurality of Doppler images; the processing of each first Doppler image, wherein said processing comprises the devignetting (206) of said first Doppler image, resulting in a devignetted first Doppler image; the normalization (207) of said devignetted first Doppler image based on a spatial average of an intensity of said first Doppler image, resulting in a normalized first Doppler image; and the subtraction (208), from said normalized first Doppler image, of said spatial average of said intensity of said first Doppler image, resulting in a corrected first Doppler image.
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公开(公告)号：US09733064B2
公开(公告)日：2017-08-15
申请号：US14442910
申请日：2013-11-15
发明人： Michael Atlan , Benjamin Samson
CPC分类号： G01B9/021 , G01N21/453 , G03H1/0005 , G03H1/0443 , G03H1/0866 , G03H2001/0033 , G03H2001/0456 , G03H2001/0463 , G03H2210/62 , G03H2227/03
摘要： The invention relates to a digital holography method for detecting the vibration amplitude of an object (15) having a vibration frequency ω, comprising: generating object illumination waves (Wt) and reference waves (WLO); acquiring interferograms between the reference wave (WLO) and a signal wave (Ws) by means of a bandwidth ω s detector (19), the reference wave comprising two components ELO1, ELO1 of frequencies ω1, ω2 that are respectively staggered in relation to the laser frequency ωL by a quantity δ1=γ1ωs and δ2=qω+γ2ωs, where q is an integer and −0.5≦γ1, γ2≦0.5; and calculating the vibration amplitude of the object from the optical beats spectrum deduced from the complex amplitude of an interferogram.
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