Abstract: A reflector device reflects luminous radiation of wavelength ?. The device is provided with a supporting base whereon are assembled a partially transparent mirror having a partially reflective front face and luminous radiation scattering and/or absorption structure to scatter and/or absorb luminous radiation liable to be transmitted by a rear face, opposite the front face.

Abstract: The present description concerns a method of acquisition of distances from a sensor to a scene, comprising a number N of consecutive capture sub-phases Ci, with N an integer greater than or equal to 2 and i an integer index ranging from 1 to N, each sub-phase Ci comprising: supplying a laser beam having an optical frequency (f) linearly varying over a frequency range of width Bi for a time period Ti; delivering, from the laser beam, a reference beam and a useful beam; and illuminating the scene with the useful beam and illuminating at least one pixel row with a superposition of the reference beam and of a reflected beam. An absolute value of a ratio Bi/Ti is different for each capture sub-phase Ci.

Abstract: The present description concerns an image sensor comprising a plurality of pixels (Pix), each comprising an elementary photodetector (211), wherein each pixel (Pix) comprises a circuit (201, 203) for detecting a beat frequency of a portion of a heterodyne beam received by the elementary photodetector (211) of the pixel, and wherein, in each pixel (Pix), the detection circuit (201, 203) comprises a frequency comparator (221) comprising a first input node (E1) receiving a first periodic AC signal (fpix) having a frequency equal to said beat frequency, a second input node (E2) receiving a second AC signal (framp) of variable frequency, and an output node (S) delivering an output signal switching from a first state to a second state when the frequency of the second signal (framp) exceeds the frequency of the first signal (fpix).

Abstract: The invention relates to a reduced-size FMCW lidar imager system. The imager system comprises an optical source 10 for a coherent, continuous and frequency-modulated primary signal Sp in order to illuminate the scene 2; an optical collection element 41 configured to collect a backscattered signal Sret,c; a photodetector 50 intended to receive a heterodyne signal Sh associated with the collected signal Sret,c; and a processing unit 60 configured to determine the distance zsc from the scene based on a beat frequency of the heterodyne signal sh. It is configured to fully direct the primary signal Sp to the scene 2. It additionally comprises a reflector 42 configured to reflect a portion Spr,nc, called uncollected signal Sret,nc, of the backscattered signal Sret, not collected by the optical collection element 41, in the direction of the scene 2.

Abstract: The invention relates to a FMCW lidar imager system with improved distance resolution. The imager system 1 comprises a reflector 42 configured to reflect, in the direction of the scene 2, a portion Sor,nc of the backscattered object signal Sor, which portion has not been collected by the collecting optical element 41. Thus, the collected portion Sor,c of the backscattered object signal Sor is formed from first light beams Sor,c(1) that have not been reflected by the reflector 42 and from light beams Sor,c(2) that have been reflected by the reflector 42. The heterodyne signal Sh therefore has a principal component Sh(1) associated with the light beams Sor,c(1), and a secondary component Sh(2) associated with the light beams Sor,c(2). The processing unit 60 is configured to determine the distance zsc of the scene 2 on the basis of a beat frequency fb(2) of the secondary component Sh(2) of the heterodyne signal Sh.

Abstract: A device for detecting (D) at least one predetermined particle (P) includes an interferometric element (EI) arranged so as to be illuminated by an incident radiation (Lin) and comprising at least one so-called thin layer (CM) disposed on top of a so-called substrate layer (Sub), the particle being attached to a surface (Sm) of the thin layer, the interferometric element (EI) forming a Fabry-Pérot cavity with or without attached particle P; a matrix sensor (Det) adapted to detect an image comprising a first portion (P1) deriving from the detection of the incident radiation transmitted (LTBG) by the interferometric element alone and a second portion (P2) deriving from the detection of the incident radiation transmitted (LTP) by the interferometric element and any particle (O, P) attached to a surface (Sm) of the thin layer; a processor (UT) linked to the sensor and configured: to calculate, as a function of wavelengths of the incident radiation ?i i?[1,m], the variation of intensity of at least one first pixel

Abstract: A coherent LIDAR imaging system includes a laser source; an optical splitter/recombiner designed to split the laser radiation into a reference beam and into an object beam and to superpose the reference beam on a reflected object beam reflected by the scene; and an optical imager creating an image of the scene on a detector. The detector includes an array of pixels designed for detecting the reflected object beam and the reference beam which together form a recombined beam having a beat frequency representative of a range of the illuminated scene. The optical splitter/recombiner is configured to form an intermediate image of the reference beam in an intermediate image plane perpendicular to the optical axis.

Abstract: An optical scanner (100) which comprises: a mirror (200), pivotally mounted about a first pivot axis and is partially transparent from its front face (210) towards its rear face (220) to the light radiation; a light source (300) intended to emit an incident light radiation on the front face (210) of the mirror (200); the scanner is characterised in that the rear face (220) comprises a structuration formed by at least one facet essentially planar and inclined with respect to the front face (210) so that a light radiation, incident on the front face (210), and transmitted by the at least one facet (220i) undergoes a deflection with respect to the angle of incidence of said light radiation on the front face (210).

Abstract: A pixelated filter intended to rest on a support and including, in a stacking direction: first filter pixels each including a first interference filter covered with a first dielectric block; and second filter pixels each including a second dielectric block, having a thickness greater than or equal to the thickness of the first interference filter, covered with a second interference filter, having a thickness smaller than or equal to the thickness of the first dielectric block, wherein, for at least one of the second filter pixels, the second dielectric block of the second filter pixel is interposed between the first interference filters of two first filter pixels and the second interference filter of the second filter pixel is interposed between the first dielectric blocks of the first two filter pixels.

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 photodetector (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 computation unit (62) for determining the corrected spatial phase distribution, by taking into account a spatial distribution representing a spatial intensity distribution of the backscattered object signal, so that the reference signal has a corrected spatial intensity distribution in the reception plane optimizing a spatial distribution of a parameter of interest representing the heterodyne signal.

Abstract: A coherent lidar imaging system includes a laser source, a detection device, a first optical device, an optical imaging system, a second optical device, the photodetector component of a pixel being configured so as to generate a pixel detected signal, the pixel detected signal having an intensity, called pixel total intensity, the splitter having a variable first transmittance that is identical for all of the pixels and modulable, the second optical device furthermore comprising at least one intensity modulator designed to modulate an intensity of each pixel reference beam by applying a modulable pixel transmittance, the coherent lidar imaging system furthermore comprising a processing unit configured so as to apply a first transmittance value and, for each pixel, a pixel transmittance value, the values being determined via a control loop and using an optimization criterion, the optimization criterion comprising obtaining, for each pixel, a pixel total intensity less than a threshold intensity, and obtaining

Abstract: A detection device for a coherent lidar imaging system includes an integrated detector comprising a matrix array of pixels distributed over N columns and M rows and comprising an optical guide, called reference guide, configured so as to receive a laser beam, called reference beam, N optical guides, called column guides, coupled to the reference guide, each column guide being coupled to M optical guides, called row guides, the M row guides being configured so as to route part of the reference beam into each pixel of the column, called pixel reference beam, each pixel of the integrated detector comprising: a guided photodiode coupled to an optical detection guide, a diffraction grating, called pixel grating, configured so as to couple a portion of a beam illuminating the pixel into the guided photodiode, a coupler, called pixel coupler, configured so as to couple the pixel coupled beam and at least a fraction of the pixel reference beam into the detection guide, an electronic readout and preprocessing circuit.

Abstract: A detection device for a coherent imaging system includes a detector comprising a matrix array of pixels, each pixel comprising a photodetector component having a photosensitive surface, the detector being designed to be illuminated by a coherent beam, called the image beam consisting of grains of light called speckle grains, a matrix array of transmissive deflecting elements configured to be individually orientable by means of an electrical signal, so as to deflect a fraction of the image beam incident on the group, and thus modify the spatial distribution of the speckle grains in the plane of the photosensitive surface, each group of one or more pixels further comprising a feedback loop associated with the deflecting element and configured to actuate the deflecting element so as to optimize the signal-to-noise ratio from the light detected by the one or more photodetector components of the group of pixels, the feedback loop comprising a feedback circuit.

Abstract: An image sensor including a plurality of pixels, each including: a semiconductor photodetection region; a metal region arranged on a first surface of the semiconductor region; a band-pass or band elimination interference filter arranged on a second surface of the semiconductor region opposite to the first surface; and between the semiconductor region and the metal region, a portion of the absorbing layer made of a material different from that of the semiconductor region, the absorbing layer being capable of absorbing, in a single passage, more than 30% of an incident radiation at the central wavelength of the pass band or of the stop band of the interference filter.

Abstract: A device for detecting (D) at least one predetermined particle (P) includes an interferometric element (EI) arranged so as to be illuminated by an incident radiation (Lin) and comprising at least one so-called thin layer (CM) disposed on top of a so-called substrate layer (Sub), the particle being attached to a surface (Sm) of the thin layer, the interferometric element (EI) forming a Fabry-Pérot cavity with or without attached particle P; a matrix sensor (Det) adapted to detect an image comprising a first portion (P1) deriving from the detection of the incident radiation transmitted (LTBG) by the interferometric element alone and a second portion (P2) deriving from the detection of the incident radiation transmitted (LTP) by the interferometric element and any particle (O, P) attached to a surface (Sm) of the thin layer; a processor (UT) linked to the sensor and configured: to calculate, as a function of wavelengths of the incident radiation ?i i?[1,m], the variation of intensity of at least one first pixel

Abstract: An interference filter, including a first interface layer; a first dielectric portion of a first dielectric material, having a first thickness and resting on the first interface layer at a first location; a second dielectric portion of the first dielectric material, the second dielectric portion resting on the first interface layer at a second location, the second dielectric portion having a second thickness greater than the first thickness; a third dielectric portion of a second dielectric material having a refraction index smaller than the refraction index of the first material, the third dielectric portion having a third thickness and resting on the first dielectric portion, the sum of the first thickness and of the third thickness being equal to the second thickness; and a second interface layer resting on the second and third dielectric portions.

Abstract: A filtering device comprising first and second interference filters each comprising a Fabry-Perot cavity formed by semi-reflective layers between which a structured layer is arranged, wherein the structured layer belongs conjointly to the two filters, has a substantially constant thickness, is substantially planar and comprises two materials with different refractive indices arranged in each of the cavities, forming vertical structurings, the cavity of the second filter comprises a spacer arranged between one of the semi-reflective layers and the structured layer so that a distance between the semi-reflective layers of the cavity of the second filter is greater than a distance between the semi-reflective layers of the cavity of the first filter, and the filters comprise a second structured layer arranged in the cavities of the filters, and/or each filter comprises a second Fabry-Perot cavity comprising a third structured layer.

Abstract: A device for detecting electromagnetic radiation includes at least one thermal detector, placed on a substrate; an encapsulating structure forming a cavity housing the thermal detector, including at least one thin encapsulating layer; and at least one Fabry-Perot interference filter, formed by first and second semi-reflective mirrors that are separated from each other by a structured layer. A high-index layer of one of the semi-reflective mirrors is at least partially formed from the thin encapsulating layer.

Abstract: A reflector device reflects luminous radiation of wavelength ?. The device is provided with a supporting base whereon are assembled a partially transparent mirror having a partially reflective front face and luminous radiation scattering and/or absorption structure to scatter and/or absorb luminous radiation liable to be transmitted by a rear face, opposite the front face.

Abstract: An image sensor including a plurality of pixels, each including: a semiconductor photodetection region; a metal region arranged on a first surface of the semiconductor region; a band-pass or band elimination interference filter arranged on a second surface of the semiconductor region opposite to the first surface; and between the semiconductor region and the metal region, a portion of the absorbing layer made of a material different from that of the semiconductor region, the absorbing layer being capable of absorbing, in a single passage, more than 30% of an incident radiation at the central wavelength of the pass band or of the stop band of the interference filter.