Disclosed is a multispectral imager designed for analyzing a spectral domain of interest, comprising an image sensor (100) formed of an array of macropixels and comprising a first and a second photosensitive pixel (115) respectively dedicated to a first and a second spectral band, and a filtering structure (150) comprising a first and second interference filter (160) which are superimposed respectively on the first and second photosensitive pixel (115) and which are arranged to respectively transmit a first and second electromagnetic radiation belonging respectively to the first and second spectral bands, the multispectral imager in which a wavelength half of that of the second electromagnetic radiation is located in the spectral domain of interest, and a filtering layer (170) is superimposed on the second photosensitive pixel (160) and configured to block the passage of a third electromagnetic radiation of wavelength half that of the second electromagnetic radiation.
Disclosed is a multispectral imager designed for analysing a spectral domain of interest, comprising an image sensor (100) formed of an array of macropixels and comprising a first and a second photosensitive pixel (115) respectively dedicated to a first and a second spectral band, and a filtering structure (150) comprising a first and second interference filter (160) which are superimposed respectively on the first and second photosensitive pixel (115) and which are arranged to respectively transmit a first and second electromagnetic radiation belonging respectively to the first and second spectral bands, the multispectral imager in which a wavelength half of that of the second electromagnetic radiation is located in the spectral domain of interest, and a filtering layer (170) is superimposed on the second photosensitive pixel (160) and configured to block the passage of a third electromagnetic radiation of wavelength half that of the second electromagnetic radiation.
Disclosed is a multispectral imager designed for analysing a spectral domain of interest, comprising an image sensor (100) formed of an array of macropixels and comprising a first and a second photosensitive pixel (115) respectively dedicated to a first and a second spectral band, and a filtering structure (150) comprising a first and second interference filter (160) which are superimposed respectively on the first and second photosensitive pixel (115) and which are arranged to respectively transmit a first and second electromagnetic radiation belonging respectively to the first and second spectral bands, the multispectral imager in which a wavelength half of that of the second electromagnetic radiation is located in the spectral domain of interest, and a filtering layer (170) is superimposed on the second photosensitive pixel (160) and configured to block the passage of a third electromagnetic radiation of wavelength half that of the second electromagnetic radiation.
A hybrid multispectral imaging sensor, characterized in that it comprises a photosensitive backside-illumination detector (DET) that is made on a substrate (100) made of InP, and that is formed of a matrix of pixels (105, P1, P2, P3) that are themselves made in a structure based on InGaAs (103), and a filter module (MF) that is formed of a matrix of elementary filters (λ1, λ2, λ3) reproducing said matrix of pixels, and that is mounted into contact with said substrate (100), said substrate (100) made of InP having a thickness less than 50 μm, and preferably less than 30 μm.
H04N 25/75 - Circuitry for providing, modifying or processing image signals from the pixel array
H04N 25/60 - Noise processing, e.g. detecting, correcting, reducing or removing noise
H04N 23/11 - Cameras or camera modules comprising electronic image sensorsControl thereof for generating image signals from different wavelengths for generating image signals from visible and infrared light wavelengths
A method of limiting cross-talk in an imaging sensor, the sensor being in the form of a matrix of macropixels defining an image, each macropixel being formed by a matrix of individual pixels, each of which is dedicated to a distinct spectral band, all of the individual pixels dedicated to the same spectral band forming a sub-image, the image being topologically subdivided into at least one parcel, and the method including the following steps: measuring the spectral response of each individual pixel λ1, λ2, λ3, . . . , λ9; calculating the mean spectral response of each sub-image in a parcel; targeting to define the ideal response of each sub-image in the parcel; estimating a series of coefficients for minimizing cross-talk in the parcel; and applying the coefficients to the macropixels in order to correct the sub-images in the parcel. The method is remarkable in that the ideal response is a Gaussian function.
G01J 3/26 - Generating the spectrumMonochromators using multiple reflection, e.g. Fabry-Perot interferometer, variable interference filter
H04N 5/359 - Noise processing, e.g. detecting, correcting, reducing or removing noise applied to excess charges produced by the exposure, e.g. smear, blooming, ghost image, crosstalk or leakage between pixels
H04N 9/73 - Colour balance circuits, e.g. white balance circuits or colour temperature control
H04N 17/00 - Diagnosis, testing or measuring for television systems or their details
Hybrid multispectral imaging sensor, characterized in that it comprises: a photosensitive detector (DET) that is sensitive to backside illumination, said detector being produced on an InP substrate (100) and formed from a matrix array of pixels (105, P1, P2, P3) themselves produced in a structure (103) based on InGaAs; and a filtering module (MS) formed from a matrix array of elementary filters (?1, ?2, ?3) replicating this matrix array of pixels and bonded in contact with said substrate (100), said InP substrate (100) having a thickness smaller than 50 µm, and preferably smaller than 30 µm.
Hybrid multispectral imaging sensor, characterized in that it comprises: a photosensitive detector (DET) that is sensitive to backside illumination, said detector being produced on an InP substrate (100) and formed from a matrix array of pixels (105, P1, P2, P3) themselves produced in a structure (103) based on InGaAs; and a filtering module (MS) formed from a matrix array of elementary filters (λ1, λ2, λ3) replicating this matrix array of pixels and bonded in contact with said substrate (100), said InP substrate (100) having a thickness smaller than 50 µm, and preferably smaller than 30 µm.
The invention relates to a multispectral imaging device including: a photosensitive detector DET made up of a matrix of pixels; an array of microlenses ML1, ML2, ML3 reproducing the matrix of pixels; and a filter module MF formed by a matrix of individual filters λ1, λ2, λ3 reproducing the matrix of pixels. The device is remarkable in that the array of microlenses is arranged directly in contact with the detector DET, and the filter module MF is made on a substrate SS that is put into contact with the array of microlenses.
A method for limiting crosstalk in a specific image sensor comprising a matrix of macropixels is described. Each macropixel is formed by a matrix of individual pixels each dedicated to a distinct spectral band. All of the individual pixels dedicated to the same spectral band form a sub-image of an image being topologically subdivided into at least one parcel. The method comprises the following steps: measuring the spectral response of each individual pixel; calculating the mean spectral response of each sub-image in a parcel; targeting to define the ideal response of each sub-image in the parcel; estimating a series of coefficients for minimizing crosstalk in this parcel; and applying these coefficients to the macropixels in order to correct the sub-images in the parcel.
The invention relates to a method for limiting crosstalk in an image sensor, said sensor being an array of macropixels defining an image, each macropixel being formed by a matrix of elementary pixels each dedicated to a distinct spectral band, all of the elementary pixels dedicated to the same spectral band forming a sub-image, this image being topologically broken down into at least one plot, the method comprising the following steps: measuring 700 the spectral response of each elementary pixel λ1, λ.2 , λ3,..., λ9, - calculating 701 the average spectral response of each sub-image in a plot, - targeting 702 to establish the ideal response of each sub-image in this plot, - calculating 703 a series of coefficients to minimise the crosstalk in this plot, - applying 704 said coefficients to the macropixels to correct the sub-images in the plot. The method is characterised in that the ideal response is a Gaussian function.
The invention relates to a multispectral imaging device including: a photosensitive detector DET formed from a matrix-array of pixels; an array of microlenses ML1, ML2, ML3 replicating this matrix-array of pixels; and a filtering module MF formed from a matrix-array of elementary filters λ1, λ2, λ3 replicating this matrix-array of pixels. The device is noteworthy in that the array of microlenses being arranged directly in contact with the detector DET, the filtering module MF is produced on a substrate SS that makes contact with the array of microlenses.
The invention relates to a multispectral imaging device including: a photosensitive detector DET formed from a matrix-array of pixels; an array of microlenses ML1, ML2, ML3 replicating this matrix-array of pixels; and a filtering module MF formed from a matrix-array of elementary filters ?1, ?2, ?3 replicating this matrix-array of pixels. The device is noteworthy in that the array of microlenses being arranged directly in contact with the detector DET, the filtering module MF is produced on a substrate SS that makes contact with the array of microlenses.
OFFICE NATIONAL D'ETUDES ET DE RECHERCHES AEROSPATIALES (France)
SILIOS TECHNOLOGIES (France)
Inventor
Tisserand, Stéphane
Guerineau, Nicolas
Abstract
Two-wave interferometric device, making it possible to obtain an interference pattern of a light source (S), whose light passes through the device, comprising: - a dephasing layer (A) made of a first material (1), of optical index nA, comprising a first face (A1) and a second face (A2) opposite one another, said first face (A1) comprising at least one element or surface not parallel to said second face (A2); - a support layer (B) made of a second material (2), of optical index nB differing from the optical index nA, comprising a first face (B1) opposite and parallel to a second face (B2); - the second face (A2) of the dephasing layer (A) and the second face (B2) of the support layer (B) being joined, in such a way as to form a monolithic interferometric plate (LM).
The invention relates to an optical probe, comprising: a first cell (C1) which includes a first transmission module (LED1) and a first detection module (D1) capable of producing a first detection signal; a second cell (C2) which includes a second detection module (D2) capable of generating a first signal for monitoring the first transmission module (LED1); a control circuit for generating a first signal for the weighted measurement of the first detection signal using the first monitoring signal. Furthermore, the second cell (C2) includes a second transmission module (LED2); the second detection module (D2) is capable of generating a second detection signal; and the first detection module (D1) is capable of generating a second signal for monitoring the second transmission module (LED2).
G01N 21/27 - ColourSpectral properties, i.e. comparison of effect of material on the light at two or more different wavelengths or wavelength bands using photo-electric detection
G01N 21/85 - Investigating moving fluids or granular solids
15.
OPTICAL ABSORPTION PROBE PROVIDED WITH EMISSION SOURCE MONITORING
The invention relates to an optical probe for measuring absorption in order to generate an absorption value Am, said probe including an analysis cell CA, said analysis cell including an LED emission module F1, HD and a detection module H1, D1 capable of generating a detection signal. The optical probe further includes a monitoring cell CM capable of generating a monitoring signal MS. The monitoring cell is further arranged on the optical path between the emission module and the detection module.
The invention relates to a wavelength spectroscopy device comprising, on a substrate, a filtering cell CF consisting of two mirrors separated by a spacing membrane, this filtering cell being formed by a plurality of interference filters. In addition, this device includes an emission cell CE having a plurality of emission sources, each of these sources being associated with one of the interference filters.
The invention relates to a wavelength spectroscopy device that comprises, on a substrate SUB, a filtering module comprising two mirrors MIR1, MIR2 separated by a spacing membrane SP. The filtering module includes a plurality of interference filters FP1, FP2, FP3, the thickness of the spacing membrane SP being constant for a given filter and varying from one filter to the other.
The invention relates to a system for homogenising a laser pulse emitted by a laser source in order to illuminate a target homogeneously. According to the invention, the following elements are disposed between the laser source and the target, namely: a disperser including at least one multi-mode optical fibre intended to generate numerous spatio-temporal modes due to the optical fibre having a delay time Tr such that Tc ឬ Tr ឬ Δt, Tc and Δt representing respectively the temporal coherence and the duration of the laser pulse; and focusing means for imaging the output plane of the optical fibre on the target by superimposing the spatio-temporal modes in a homogeneous spot.
The invention relates to a system for homogenising a laser pulse emitted by a laser source in order to illuminate a target homogeneously. According to the invention, the following elements are disposed between the laser source and the target, namely: a phase plate formed by a plurality of subpupils capable of generating a plurality of delayed laser beams in the direction of the target, the path difference Δd between two adjacent delayed laser beams being greater than the temporal coherence Tc of the laser pulse; and focusing means for superimposing said delayed laser beams on the target in a homogeneous spot.
patents
