WO2020100139A1 - Module optique et procédé d'extension de champ de vision dans des systèmes d'imagerie hyperspectrale - Google Patents

Module optique et procédé d'extension de champ de vision dans des systèmes d'imagerie hyperspectrale Download PDF

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Publication number
WO2020100139A1
WO2020100139A1 PCT/IL2019/051237 IL2019051237W WO2020100139A1 WO 2020100139 A1 WO2020100139 A1 WO 2020100139A1 IL 2019051237 W IL2019051237 W IL 2019051237W WO 2020100139 A1 WO2020100139 A1 WO 2020100139A1
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WO
WIPO (PCT)
Prior art keywords
splitting
optical module
focal plane
reflective unit
fov
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PCT/IL2019/051237
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English (en)
Inventor
Erez YACOBY
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Israel Aerospace Industries Ltd.
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Publication of WO2020100139A1 publication Critical patent/WO2020100139A1/fr

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    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01J—MEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT, POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRARED, VISIBLE OR ULTRAVIOLET LIGHT; COLORIMETRY; RADIATION PYROMETRY
    • G01J3/00—Spectrometry; Spectrophotometry; Monochromators; Measuring colours
    • G01J3/02—Details
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01J—MEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT, POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRARED, VISIBLE OR ULTRAVIOLET LIGHT; COLORIMETRY; RADIATION PYROMETRY
    • G01J3/00—Spectrometry; Spectrophotometry; Monochromators; Measuring colours
    • G01J3/28—Investigating the spectrum
    • G01J3/2823—Imaging spectrometer
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01J—MEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT, POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRARED, VISIBLE OR ULTRAVIOLET LIGHT; COLORIMETRY; RADIATION PYROMETRY
    • G01J3/00—Spectrometry; Spectrophotometry; Monochromators; Measuring colours
    • G01J3/02—Details
    • G01J3/0205—Optical elements not provided otherwise, e.g. optical manifolds, diffusers, windows
    • G01J3/021—Optical elements not provided otherwise, e.g. optical manifolds, diffusers, windows using plane or convex mirrors, parallel phase plates, or particular reflectors
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01J—MEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT, POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRARED, VISIBLE OR ULTRAVIOLET LIGHT; COLORIMETRY; RADIATION PYROMETRY
    • G01J3/00—Spectrometry; Spectrophotometry; Monochromators; Measuring colours
    • G01J3/02—Details
    • G01J3/0294—Multi-channel spectroscopy
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01J—MEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT, POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRARED, VISIBLE OR ULTRAVIOLET LIGHT; COLORIMETRY; RADIATION PYROMETRY
    • G01J3/00—Spectrometry; Spectrophotometry; Monochromators; Measuring colours
    • G01J3/28—Investigating the spectrum
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01J—MEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT, POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRARED, VISIBLE OR ULTRAVIOLET LIGHT; COLORIMETRY; RADIATION PYROMETRY
    • G01J3/00—Spectrometry; Spectrophotometry; Monochromators; Measuring colours
    • G01J3/28—Investigating the spectrum
    • G01J3/30—Measuring the intensity of spectral lines directly on the spectrum itself
    • G01J3/36—Investigating two or more bands of a spectrum by separate detectors

Definitions

  • the present invention relates to the field of hyperspectral imaging systems. More specifically, it relates to an optical module and method for extending field of view (FOV) in hyperspectral imaging systems.
  • FOV field of view
  • High performance imaging spectrometers image an entrance slit onto a 2D (two- dimensional) detector array where the length of the slit extends along a first of the dimensions of the 2D detector array and the dispersion created by a diffraction grating, a prism or any combination of the two, relatively displacing images of the slit in a second orthogonal dimension of the 2D detector array. Displacements of the slit images in the second dimension register the spectral content of light collected through the entrance slit.
  • a hyperspectral image of a scene is captured by incorporating fore- optics for imaging a slice of a scene onto the slit and translating the spectrometer in a so-called "push-broom" manner to capture contiguous images of the scene's spatial radiance distribution.
  • Each pixel of the scene is associated with a substantially contiguous spectrum spread over the second orthogonal dimension of the 2D detector array.
  • Performance objectives are set for imaging spectrometers such as increasing spectral range and spectral and spatial resolution, decreasing package size, and enlarging the field of view.
  • performance gains achieved for one objective are offset by performance losses encountered for other objectives.
  • To improve the spatial field coverage at a particular resolution multiple systems are incorporated, where the“linear fields of view” of the systems are aligned end to end. This solution is prohibitive for many applications due to the costs of the multiple detectors, coolers, spectrometers, or space, weight, or power constraints. Additionally or alternatively, hyperspectral sensors having a greater number of pixels may be developed.
  • the present invention meets the need to provide a hyperspectral imaging system having a large scan width.
  • the width of the commercially available matrix detector that can be used by conventional hyperspectral imaging systems is in the order of 1,000-2,000 pixels (number of effective pixels), such that the scan width and also the field of view (FOV) is limited.
  • FOV field of view
  • hyperspectral imaging systems have an entrance slit, a dispersive element (e.g. grating), and a hyperspectral sensor, which is placed downstream and in proximity to the dispersive element.
  • These hyperspectral imaging systems have typically two focal planes: the first focal plane being located at the entrance slit, and the second focal plane being located at the final imaging plane of the imager.
  • the sensor collects the intensity of detected signals for a specific wavelength band/range creating a special spectral signature (i.e. fingerprint) enabling identification of the materials that make up a scanned object.
  • the precision of these sensors is typically measured in spectral resolution, which is the width of each band of the spectrum that is captured.
  • the scanner detects a large number of narrow frequency bands, it is possible to identify objects even if they are only captured in a handful of pixels. However, spatial resolution is a factor in addition to spectral resolution. If the pixels are too large, then multiple objects are captured in the same pixel and become difficult to identify. If the pixels are too small, then the energy captured by each sensor cell is low, and the decreased signal-to-noise ratio reduces the reliability of measured features.
  • the present invention uses the two focal planes of the hyperspectral imaging systems (i.e. first and second focal plane) to extend the FOV of any hyperspectral imaging system by placing a splitting reflective unit at the first focal plane of the hyperspectral imaging system located at the region of the entrance slit.
  • the present invention thus provides an extension of the dimension of the entrance slit (e.g. doubled in size) being located at the first (intermediate) focal plane. More specifically, the present invention enables to increase the FOV at least by a factor of 2, and thereby enables launching into space one hyperspectral imaging system having a certain FOV being equivalent to two hyperspectral imaging systems in terms of covered swath.
  • the covered swath of one hyperspectral aircraft or spacecraft having an extended FOV is equivalent to the covered swath of two hyperspectral aircrafts or spacecrafts. Because a plurality of spaced-apart detectors are provided, the present invention enables to reduce significantly the involved expenses associated with the production of aircrafts as well as the involved expenses associated with launching of a plurality of aircrafts (e.g. satellites) into space.
  • a plurality of aircrafts e.g. satellites
  • an optical module to be used with a fore optic imager of a hyperspectral imaging system defining a certain field of view (FOV), and focusing at least one input beam onto an intermediate focal plane.
  • the optical module comprises a splitting reflective unit for receiving at least one focused input beam and splitting each focused input beam into a plurality of N spatially separated light beams, each light beam defining a respective optical path; a dispersion assembly being configured and operable to spectrally separate each of the plurality of N spatially separated light beams into components of different wavelength bands; the dispersion assembly comprising a plurality of N dispersion units, each dispersion unit being accommodated at the output of the splitting reflective unit in each respective optical path; an imaging assembly comprising a plurality of N spaced-apart detectors, each detector being accommodated at a respective imaging conjugated focal plane of the splitting reflective unit; each detector being aligned with the output of each respective dispersion unit in each respective optical path, wherein N is an integer having
  • the present invention enables to extend the FOV in a hyperspectral imaging system by splitting the entrance slit, being the image of the fore optics upstream, to the dispersive element.
  • the imaging assembly defines an extended FOV, as compared to the certain FOV of the hyperspectral imaging system.
  • This may be implemented by placing a splitting reflecting unit configured for extending the FOV at the entrance slit, at which the light beam is focused and narrow.
  • the splitting reflecting unit can be placed at the intermediate focal plane of the hyperspectral optics, such that each input beam is focused onto the splitting reflective unit.
  • the intermediate focal plane of the hyperspectral optics is located at the entrance slit location such that the entrance slit is then configured as a reflective slit instead of a transmissive slit.
  • the optical module may comprise an entrance slit accommodated at the intermediate focal plane.
  • the splitting reflective unit is then accommodated downstream to the entrance slit.
  • the splitting reflective unit comprises at least two reflective surfaces (e.g. a retro-reflector element or an angled prism) such that a focused input light beam impinging upon the reflective unit is redirected towards different spatial locations (at which the dispersive elements are placed) and imaged onto at least two focal planes, instead of one focal plane.
  • This splitting reflective unit spatially separates between two portions of the beam incident onto the two facets of the splitting reflective unit, to propagate towards two light sensitive surfaces/sensors. Both sensors are located at two conjugated focal planes of the splitting reflective unit.
  • the splitting reflective unit may comprise a plurality of tilted reflective surfaces having a certain angle between them, or an angled prism. As for dispersive elements, they are placed between the respective facets of the splitting reflective unit and the sensors.
  • the splitting reflecting unit may be a prism placed after (downstream) the entrance slit.
  • each detector is configured as a two dimensional pixel matrix, wherein each pixel is configured and operable to detect a light beam having a different wavelength bands.
  • a hyperspectral imaging system defining a certain field of view (FOV).
  • the hyperspectral imaging system comprises a fore optic imager configured and operable for collecting at least one input beam from a target object and focusing it onto an intermediate focal plane, and an optical module as defined above.
  • a method of extending the field of view FOV of a hyperspectral imaging system comprises receiving at least one focused beam and splitting each focused beam into a plurality of spatially separated light beams; reflecting each of the plurality of spatially separated light beams towards a plurality of dispersive elements; spectrally separating each of the plurality of spatially separated light beams into components of different wavelength bands; and imaging each of the plurality of beams onto a plurality of spaced apart detectors, defining together an extended FOV as compared to the FOV of the hyperspectral imaging system.
  • the method further comprises focusing at least one input beam indicative of a target object onto an intermediate focal plane.
  • Fig. 1 shows a typical conceptual hyperspectral satellite system for imaging the ground by using a push-broom scanner
  • Fig. 2 shows a block diagram illustrating a possible configuration of the optical module according to some embodiments of the present invention
  • Fig. 3 shows an example of a hyperspectral imaging system according to some embodiments of the present invention
  • Fig. 4 shows a block diagram illustrating another possible configuration of the optical module according to some embodiments of the present invention.
  • Fig. 5 shows a flow chart illustrating main steps for implementing a method of extending the field of view of a hyperspectral imaging system, according to some embodiments of the present invention.
  • Fig. 1 illustrating a typical conceptual hyperspectral satellite system for imaging the ground by using a push-broom scanner.
  • Typical push-broom hyperspectral imaging systems consist of a fore optic imager, a slit, a line spectrometer, and a two dimensional focal plane with a spatial and spectral direction.
  • the fore optic (i.e. collecting optics) image is typically a one dimensional pixel array (i.e. line-scan systems) collecting at least one input light beam being indicative of a one-dimensional scene/target object on a cross-track direction (e.g. along an x-axis).
  • the fore optics focus each input beam indicative of a scanned target object onto an intermediate focal plane at which the entrance slit is typically accommodated.
  • the fore optic imager scans the one-dimensional scene on the ground along an along-track direction (e.g. y-axis).
  • Each input light beam being indicative of the one-dimensional scene, is focused towards the entrance slit, being a one dimensional focal plane of the fore optics.
  • Each input light beam then propagates towards a line spectrometer (i.e. dispersing element) such as a prism or grating through a first optics, such that each spectral band is spatially separated and projected through a second optics towards a two-dimensional focal plane.
  • a line spectrometer i.e. dispersing element
  • the scene observed by the fore optic imager is imaged onto a slit aperture.
  • the scene which fills the slit aperture is re-imaged through the spectrometer with the wavelengths dispersed by a diffraction grating (or a prism) onto a 2D Focal Plane Array (FPA) detector such as a CCD (or a CMOS).
  • FPA Focal Plane Array
  • One axis of the FPA spatial; pixel-rows
  • the second axis corresponds to spectral wavelength.
  • a spectrogram being indicative of the signal of cross-track direction as a function of the spectral band (i.e. a wavelength intensity map of a scene) is collected. While the push-broom scanner advances along the along-track direction, spectrograms are continuously collected by the hyperspectral imaging system, creating a spectral identifiable signature. The spectrograms are combined to form a three-dimensional (x,y,k) hyperspectral data cube for processing and analysis, where x and y represent two spatial dimensions of the scene, and l represents the spectral dimension (comprising a range of wavelengths).
  • Each 2D image (frame capture), is digitized by the FPA into a 2D data-array corresponding to the field of view (FOV) imaged through the slit. While scanning a wide scene, multiple 2D image frame captures are taken while spatially stepping across the desired scene width, and these individual frames are stacked to produce a data file commonly called a hyperspectral data cube. Hyperspectral imaging sensors require a unique capability for maintaining precise spatial and spectral integrity over a wide FOV.
  • Fig. 2 illustrating a block diagram being a possible configuration of the optical module according some embodiments of the present invention.
  • Optical module 100 is configured to be optically connected to a fore optic imager 302 of an hyperspectral imaging system defining a certain field of view (FOV) focusing at least one input beam onto an intermediate focal plane.
  • Fore optic imager 302 is configured as a typical fore optic imager of a hyperspectral imaging system, enabling to integrate the novel optical module 100 of the present invention into any commercially available hyperspectral imaging system.
  • Fore optic imager 302 is configured and operable for collecting at least one input beam from a target object and focusing it onto an intermediate focal plane.
  • the novel optical module 100 is accommodated at the intermediate focal plane in a path of the light focused by the fore optic imager 302. More specifically, the entrance of the novel optical module 100 is accommodated at the intermediate focal plane.
  • the entrance of the novel optical module 100 may be implemented by a splitting reflective unit or by an entrance slit as described below.
  • Optical module 100 comprises a splitting reflective unit 104 for receiving at least one focused input beam from the fore optic imager and splitting each focused input beam into a plurality of N spatially separated light beams.
  • a dispersion assembly comprises a plurality ofN dispersion units (106A and 106B), each dispersion unit being configured and operable to spectrally separate each of the plurality of N spatially separated light beams into components of different wavelength bands, and an imaging assembly comprising a plurality ofN spaced-apart detectors (102A and 102B).
  • N is equal to two.
  • the invention is not limited to any specific number of elements.
  • each dispersion unit comprises collimating optics accommodated downstream to the entrance slit plane and being configured to collimate the focused input beam towards the dispersion element.
  • Each dispersion unit also comprises focusing optics accommodated upstream to the detectors (placed at the focal plane) and being configured to focus the dispersed input beam onto the detectors.
  • the splitting reflective unit 104 may be a reflecting element (e.g. mirror) having a plurality of facets (i.e. reflective surfaces) such as several tilted mirrors having an angle between the facets, an angled prism, or a retro-reflector splitting each input beam into large number of beams.
  • Each focused input beam impinging upon the reflective unit 104 is redirected towards different spatial locations and imaged onto at least two spaced-apart focal planes.
  • the number of dispersion units and the number of spaced apart detectors correspond to the number of spatially separated light beams.
  • Each spatially separated light beam defines a respective optical path referred to in the present example as OPi and OP2.
  • Dispersion unit 106A is accommodated at the output of the splitting reflective unit 104 in the optical path OPi.
  • Dispersion unit 106B is accommodated at the output of the splitting reflective unit 104 in the optical path OP2.
  • Each detector 102A and 102B may be configured as a two dimensional pixel matrix, one dimension being the spatial dimension for receiving each spatially separated light beam for each spectral band, and the second dimension being the spectral dimension for receiving different spectral bands.
  • Each detector 102A and 102B is accommodated at a respective imaging conjugated focal plane of the splitting reflective unit 104. More specifically, detector 102A is aligned with the output of dispersion unit 106A in the optical path OPi. Detector 102B is aligned with the output of dispersion unit 106B in the optical path OP2.
  • Each detector 102A and 102B is configured for providing the intensity of the light collected on each pixel as a function of the wavelength band. In other words, each pixel is a spectral pixel configured to collect light of a different wavelength band.
  • the novel optical module of the present invention enables to provide an extended FOV without reducing the spatial resolution of the detectors.
  • the creation of a plurality of second focal planes, as well as the provision of a plurality of detectors provides an optical module with an extended FOV for the same spatial resolution. A larger object area can thus be scanned, for the same amount of time, with the same precision.
  • Using the optical module of the present invention in one hyperspectral system havingN spatially separated light beams is equivalent to using N hyperspectral systems in terms of spatial resolution and FOV.
  • the splitting reflective unit 104 is, in this embodiment, located at the intermediate focal plane, at which the entrance slit is typically accommodated. It should be noted that in some embodiments, the splitting reflective unit 104 may have the dimensions of the entrance slit typically used with such a fore optic imager of such a hyperspectral imaging system. In the optical setup, the splitting reflective unit 104 replaces the entrance slit at the intermediate focal plane, enabling collection and spatial separation of the focused input beam.
  • Fig. 3 illustrating an example of a hyperspectral imaging system 300 according to some embodiments of the present invention.
  • Hyperspectral imaging system 300 comprises a fore optic imager 302 configured and operable for collecting at least one input beam from a target object and focusing it onto an intermediate focal plane, and an optical module 200 having an entrance slit 108 being accommodated at the intermediate focal plane in a path of the light focused by the fore optic imager 302.
  • the fore optic imager 302 is configured as a typical fore optic imager of a hyperspectral imaging system.
  • the optical module 200 comprises, in addition to the above described elements in Fig. 2, an entrance slit 108 accommodated at the intermediate focal plane.
  • the splitting reflective unit 104 having two facets (e.g.
  • the fore optic imager 302 collects at least one input light beam being indicative of a one-dimensional scene on a cross-track direction (e.g. along an x-axis), and scans the one-dimensional scene on the ground along an along-track direction (e.g. y-axis).
  • Each input light beam being indicative of the one-dimensional scene is focused towards the novel optical module of the present invention, in this specific example towards the entrance slit 108.
  • the light beam focused by the fore optic imager 302 is transmitted through the entrance slit 108 and impinges upon the splitting reflective unit 104.
  • Each input light beam is then split into a plurality of spatially separated light beams and each spatially separated light beams then propagates, in a collimated manner using the collimating optics described above with respect to Fig. 2, towards a respective dispersion unit 106A and 106B (e.g. including a prism or grating), such that each spectral band is spatially separated, projected and focused using focusing optics described above with respect to Fig. 2, towards a one dimensional focal plane at which the detectors 102A and 102B are placed.
  • a respective dispersion unit 106A and 106B e.g. including a prism or grating
  • the dimension of the entrance slit is extended by a factor of N as compared with the dimension of an entrance slit typically used with such fore optic imagers of such hyperspectral imaging systems.
  • the slit width corresponds to the width of one pixel size of the detector
  • the slit length L is extended by a factor of N, since the number of detectors is extended by a factor of N.
  • the extension of the slit length enlarges the swath width of the hyperspectral imaging system and also the FOV of the hyperspectral imaging system. It should be noted that the FOV describes the opening angle of the fore optic imager that can be imaged by a certain detector width.
  • the imaging assembly has an extended FOV as compared to the certain FOV of a typical hyperspectral imaging system.
  • the opening angle and the fore optic imager's altitude above the ground determine the size of the imaged area (swath width).
  • the altitude of the aircraft, the viewing angle, and the FOV of the imager determines the available ground swath width.
  • the scene which fills the slit aperture being enlarged by a factor ofN is re imaged with the wavelengths dispersed by dispersion unitsl06A and 106B onto N 2D Focal Plane Array (FPA) detector such as a CCD.
  • FPA Focal Plane Array
  • Each pixel of the FPA images a respective spectral wavelength band.
  • the swath width of the hyperspectral imaging system corresponds to the multiplication of each detector width. More specifically, the swath width corresponds to the ground sample distance multiplied by a factor ofN multiplied by the number of pixels in each detector width.
  • N is equal to two (i.e.
  • the splitting unit 104 is configured for spatially separating each focused light beam into two components), the swath width of the hyperspectral imaging system, using the novel optical module of the present invention, corresponds to two detector widths being the ground sample distance multiplied by 2, multiplied by the number of pixels in each detector.
  • a first half of each beam is reflected by one facet of the splitting reflective unit 104, and a second half of each beam is reflected by the other facet of the splitting reflective unit 104. After being reflected, each half beam is directed towards the second focal plane of the hyperspectral imaging system 300 through each dispersion unit 106A and 106B respectively.
  • Two detectors 102A and 102B are positioned respectively in these focal planes.
  • Each detector is capable of covering half of the focal plane.
  • the spaced-apart detectors 102A and 102B form together a continuous focal plane imaging the entrance slit region (first focal plane).
  • the novel optical module 200 of the present invention provides an extension of the one dimensional entrance slit (e.g. a long and narrow slit) of a hyperspectral imaging system by at least a factor of 2, such that the field of view of the system is increased by at least a factor of 2.
  • Fig. 4 illustrating a block diagram being a possible configuration of the optical module according some embodiments of the present invention.
  • Optical module 400 comprises a splitting reflective unit 404 for receiving at least one focused input beam from the fore optic imager (not shown) and splitting each focused input beam into a plurality ofN spatially separated light beams (i.e. splitting the beam field).
  • a dispersion assembly comprises a plurality of N dispersion units (406A, 406B and 406C), each dispersion unit being configured and operable to spectrally separate each of the plurality of N spatially separated light beams into components of different wavelength bands, and an imaging assembly comprising a plurality ofN spaced- apart detectors (402A, 402B and 402C).
  • N is equal to three.
  • Each focused input beam impinging upon the reflective unit 404 is redirected towards different spatial locations and imaged onto at least three spaced-apart focal planes.
  • Each spatially separated light beam defines a respective optical path referred to in the present example as OPi, OP2 and OP3.
  • Dispersion unit 406A is accommodated at the output of the splitting reflective unit 404 in the optical path OPi.
  • Dispersion unit 406B is accommodated at the output of the splitting reflective unit 404 in the optical path OP2.
  • Dispersion unit 406C is accommodated at the output of the splitting reflective unit 404 in the optical path OP3.
  • Each detector 402A, 402B and 402C may be configured as a two dimensional pixel matrix.
  • Each detector 402A, 402B and 402C is accommodated at a respective imaging conjugated focal plane of the splitting reflective unit 404. More specifically, detector 402A is aligned with the output of dispersion unit 406A in the optical path OPi. Detector 402B is aligned with the output of dispersion unit 406B in the optical path OP2. Detector 402C is aligned with the output of dispersion unit 406C in the optical path OP3.
  • the splitting reflective unit 404 is, in this specific and non-limiting example, located at the intermediate focal plane, at which the entrance slit is typically accommodated.
  • Fig. 5 illustrating the main step of the method 500 of extending the field of view FOV of a hyperspectral imaging system according to some embodiments of the present invention.
  • the method comprises the following steps: in step 504 receiving a focused beam and splitting (i.e.
  • the method 500 may comprise the preliminary step 502 of focusing at least one input beam indicative of a target object onto an intermediate focal plane.

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  • Physics & Mathematics (AREA)
  • Spectroscopy & Molecular Physics (AREA)
  • General Physics & Mathematics (AREA)
  • Investigating Or Analysing Materials By Optical Means (AREA)
  • Spectrometry And Color Measurement (AREA)

Abstract

La présente invention concerne un module optique destiné à être utilisé avec un imageur optique avant d'un système d'imagerie hyperspectrale définissant un certain champ de vision (CDV), et focalisant au moins un faisceau d'entrée sur un plan focal intermédiaire. Le module optique comprend une unité réfléchissante de division pour recevoir au moins un faisceau d'entrée focalisé et diviser chaque faisceau d'entrée focalisé en une pluralité de N faisceaux de lumière spatialement séparés, chaque faisceau de lumière définissant un trajet optique respectif; un ensemble de dispersion qui est conçu et utilisable pour séparer au plan spectral chaque faisceau de la pluralité de N faisceaux de lumière spatialement séparés en composantes de différentes bandes de longueur d'onde; l'ensemble de dispersion comprenant une pluralité de N unités de dispersion, chaque unité de dispersion étant située à la sortie de l'unité réfléchissante de division dans chaque trajet optique respectif; un ensemble d'imagerie comprenant une pluralité de N détecteurs espacés, chaque détecteur étant situé au niveau d'un plan focal conjugué d'imagerie respectif de l'unité réfléchissante de division; chaque détecteur étant aligné sur la sortie de chaque unité de dispersion respective dans chaque trajet optique respectif, N étant un nombre entier ayant une valeur d'au moins deux.
PCT/IL2019/051237 2018-11-14 2019-11-13 Module optique et procédé d'extension de champ de vision dans des systèmes d'imagerie hyperspectrale WO2020100139A1 (fr)

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IL263035A IL263035B2 (en) 2018-11-14 2018-11-14 A method for increasing the field of view in a hyperspectral system

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Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5276321A (en) * 1991-04-15 1994-01-04 Geophysical & Environmental Research Corp. Airborne multiband imaging spectrometer
US20110109903A1 (en) * 2009-11-09 2011-05-12 National Tsing Hua University Imaging Spectrometer
US20110285995A1 (en) * 2008-11-04 2011-11-24 William Marsh Rice University Image mapping spectrometers
US20140111650A1 (en) * 2012-10-19 2014-04-24 Qualcomm Incorporated Multi-camera system using folded optics

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5276321A (en) * 1991-04-15 1994-01-04 Geophysical & Environmental Research Corp. Airborne multiband imaging spectrometer
US20110285995A1 (en) * 2008-11-04 2011-11-24 William Marsh Rice University Image mapping spectrometers
US20110109903A1 (en) * 2009-11-09 2011-05-12 National Tsing Hua University Imaging Spectrometer
US20140111650A1 (en) * 2012-10-19 2014-04-24 Qualcomm Incorporated Multi-camera system using folded optics

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