EP4305447A1 - Système optique pour obtenir des informations spatiales 3d - Google Patents

Système optique pour obtenir des informations spatiales 3d

Info

Publication number
EP4305447A1
EP4305447A1 EP22709973.6A EP22709973A EP4305447A1 EP 4305447 A1 EP4305447 A1 EP 4305447A1 EP 22709973 A EP22709973 A EP 22709973A EP 4305447 A1 EP4305447 A1 EP 4305447A1
Authority
EP
European Patent Office
Prior art keywords
light
polarization
modulator
unit
optical
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
EP22709973.6A
Other languages
German (de)
English (en)
Inventor
Julian Berlow
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Scoobe3d GmbH
Original Assignee
Scoobe3d GmbH
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Scoobe3d GmbH filed Critical Scoobe3d GmbH
Publication of EP4305447A1 publication Critical patent/EP4305447A1/fr
Pending legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
    • G01S17/00—Systems using the reflection or reradiation of electromagnetic waves other than radio waves, e.g. lidar systems
    • G01S17/86—Combinations of lidar systems with systems other than lidar, radar or sonar, e.g. with direction finders
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
    • G01S17/00—Systems using the reflection or reradiation of electromagnetic waves other than radio waves, e.g. lidar systems
    • G01S17/88—Lidar systems specially adapted for specific applications
    • G01S17/89—Lidar systems specially adapted for specific applications for mapping or imaging
    • G01S17/894—3D imaging with simultaneous measurement of time-of-flight at a 2D array of receiver pixels, e.g. time-of-flight cameras or flash lidar
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
    • G01S7/00—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00
    • G01S7/48—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00 of systems according to group G01S17/00
    • G01S7/4802—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00 of systems according to group G01S17/00 using analysis of echo signal for target characterisation; Target signature; Target cross-section
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
    • G01S7/00—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00
    • G01S7/48—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00 of systems according to group G01S17/00
    • G01S7/481—Constructional features, e.g. arrangements of optical elements
    • G01S7/4816—Constructional features, e.g. arrangements of optical elements of receivers alone
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
    • G01S7/00—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00
    • G01S7/48—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00 of systems according to group G01S17/00
    • G01S7/499—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00 of systems according to group G01S17/00 using polarisation effects

Definitions

  • the invention relates to an optical system for acquiring 3D spatial information within a spatial region, in particular for acquiring 3D information about an object, a corresponding image processing system and a corresponding optical method.
  • WO 2018/033446 A1 describes an optical device, preferably based on the time-of-flight principle, for obtaining 3D spatial information.
  • Light is influenced (or rotated) with regard to its polarization by means of an optical modulator, with the optical modulator being followed by a polarization filter which only allows the light influenced (rotated) by the modulator in certain cases.
  • a polarization filter which only allows the light influenced (rotated) by the modulator in certain cases.
  • an optical system for acquiring 3D spatial information within a spatial region, in particular for acquiring 3D information of an object, which in a comparatively simple manner enables precise acquisition of the 3D spatial information enabled. Furthermore, it is the object of the invention to propose a corresponding image processing system and a corresponding optical method. In particular, one should Inexpensive 3D imaging with a comparatively high level of accuracy (in particular in the millimeter or micrometer range) can be made possible.
  • an optical system for obtaining 3D spatial information within a spatial area comprising: a light receiving device with at least one light detector which is directed to the spatial area ( or the object) can be aligned or aligned, at least one optical modulator unit for (variably) rotating a polarization of a light passing through the modulator unit, and at least one polarization filter which is optically connected before or (preferably) after the modulator unit.
  • At least one color filter in particular a bandpass filter, is provided, which is optically connected before or (preferably) after the polarization filter. It has been shown that by using such a color filter, in particular a bandpass filter, the precision in obtaining the 3D information can be improved in a comparatively simple manner. In particular, such a color filter, in particular a bandpass filter, can reduce noise and thus increase accuracy by a comparatively significant amount.
  • the modulator unit comprises at least two (optically cascaded) optical modulators (each individually configured to rotate a polarization of a light passing through).
  • comparatively inexpensive modulators e.g. liquid crystal cells, in particular TN cells
  • This multiplicity of modulators in combination is particularly preferred used with the color, especially bandpass filter. Such a combination can easily reduce a possible unsharpness resulting from the plurality of modulators or a corresponding noise (of the specific modulator unit).
  • the system has at least one 3D information acquisition unit, in particular at least one RGB camera.
  • 3D information acquisition unit in particular in the form of an RGB camera
  • precise acquisition of 3D information under different conditions (or properties of objects to be acquired) can be achieved in a particularly simple manner.
  • the advantages of the 3D information acquisition unit complement each other synergistically with the advantages resulting from the arrangement of the optical modulator unit and polarization filter.
  • the system or the 3D information acquisition unit can have a fringe projection device and/or a laser scanning device and/or a laser triangulation device and/or a ToF (time of flight) camera for acquiring 3D information exhibit.
  • At least one position detection unit for detecting a position or orientation of the light receiving device, for example an RGB camera in relation to the spatial area to be detected or the object to be detected
  • at least one gyroscope and/or accelerometer intended.
  • the light detection unit can be or can be guided (e.g. automatically and/or by appropriate action by the operator of the system) at such an angle (e.g. around the object) that a comparatively good (in particular optimized) recording of the 3D information is made possible.
  • a control unit is particularly preferably provided which is configured to determine and/or to output when a position (of the light detection unit) that is advantageous for measuring the spatial area is present relative to the spatial area to be measured, and/or a display is provided which shows the operator if there is a position (of the light detection unit) that is advantageous for measuring the spatial area in relation to the spatial area to be measured.
  • the respective modulator unit comprises at least one modulator, preferably multiple modulators.
  • the (respective) modulator can preferably assume at least or exactly two states, preferably an inactive state in which the modulator does not (at least not significantly) rotate passing light and an active state in which the modulator can rotate the passing light by a certain angle (Possibly depending on the direction of polarization of the incident light).
  • the (respective) modulator in particular liquid crystal device
  • the (respective) modulator in particular liquid crystal device
  • the (respective) modulator can be arranged inside an objective.
  • the (respective) modulator unit can have a large number of modulators for pixel-by-pixel modulation of the polarization, e.g. B. a microsystem comprising a liquid crystal micro-array.
  • At least one light generating device is provided for sending light into the spatial area.
  • the light generating device can have at least one light emitter (eg an LED or several LEDs).
  • the light generating device comprises at least one LED, for example a white light LED.
  • the light generating device can comprise at least or precisely one IR light transmission device (in particular NIR light transmission device).
  • the light-generating device can have at least one light-transmitting device (in particular an RGB light-transmitting device, e.g. in the form of at least three LEDs in the colors R, G and B), which is used to emit at least two, preferably at least or exactly three ( or at least or exactly four) different colors is configured.
  • at least one light-transmitting device in particular an RGB light-transmitting device, e.g. in the form of at least three LEDs in the colors R, G and B
  • the light-generating device can have at least one light-transmitting device (in particular an RGB light-transmitting device, e.g. in the form of at least three LEDs in the colors R, G and B), which is used to emit at least two, preferably at least or exactly three ( or at least or exactly four) different colors is configured.
  • the light generating device preferably comprises at least one diffuser.
  • a combination of at least one LED and at least one diffuser ensures and/or the "unpolarized world assumption" that is advantageous for processing the acquired data can ensure sufficient brightness in a corresponding wave range, in particular to enable a comparatively short exposure time of a camera(s).
  • the system can have a display, for example for displaying an app, which can be stored (stored) within the system, for example.
  • the display can be designed as a touch screen.
  • the modulator unit can comprise one or more, in particular at least or exactly three or at least or exactly four, preferably optically connected in series, liquid crystal device(s), preferably as TN effect-based device(s), as modulator(s).
  • a TN effect-based device is to be understood in particular as a device which is based on the twisted nematic effect (TN effect) (such as in particular a TN cell or Schadt-Halfrich cell).
  • TN effect twisted nematic effect
  • Such devices based on the TN effect (liquid crystals) are comparatively inexpensive.
  • a large number of polarization angles or directions of the light can be achieved in particular with a large number of such devices based on the TN effect (by utilizing the respective change or rotation of the polarization of the light passing through).
  • the modulator unit preferably has at least or exactly two or at least or exactly three or at least or exactly four modulators optically connected in series, in particular liquid crystal devices (TN cells). These are preferably configured and arranged in relation to one another such that the respective optically downstream modulator (in particular with regard to its transmission behavior and/or a transmitted intensity) is matched, in particular optimized, to at least one polarization direction emerging from the upstream modulator.
  • An input of the downstream modulator is particularly preferably optimized for the polarization directions (usually) emerging from the upstream modulator (in particular with regard to manufacture or configuration and positioning/orientation).
  • the system preferably comprises an evaluation unit, in particular comprising a (micro)processor and/or (micro)controller, for evaluating data recorded by the light detection unit.
  • the evaluation unit is configured in particular to determine (in particular to calculate) 3D spatial information about the 3D structure of the spatial region from the recorded data, in particular to determine (in particular to calculate) 3D information about an object (in particular on the surface of the same) and, if necessary, .
  • the system in particular the evaluation unit and/or the control unit explained below, can comprise at least one processor (CPU) and/or at least one (micro)controller and/or at least one (electronic) memory.
  • the color, in particular bandpass filter can be a single color, in particular bandpass filter and/or a multiple, preferably triple color, in particular bandpass filter, in particular for at least two colors (channels, preferably the colors (channels) red, green and blue) comprise/comprise or be formed from.
  • a single color filter in particular a bandpass filter, can be combined in particular with at least one IR illumination (illuminating unit), particularly preferably NIR illumination (ie illumination with light in the near infrared range).
  • IR illumination illumination unit
  • NIR illumination illumination with light in the near infrared range
  • a triple color filter in particular a bandpass filter, can be combined with multicolored lighting, in particular RGB lighting.
  • the (optional) light generating device preferably emits polarized light or light with a preferred polarization direction.
  • the light generating device can also be configured to emit unpolarized light or light without a preferred direction of polarization.
  • other light eg sunlight and/or room lighting
  • An (electronic) control device/control unit is preferably provided for controlling the optical modulator unit.
  • the system can be partially or fully implemented by a mobile terminal.
  • the system is preferably housed in a common assembly, for example defined by a housing.
  • the above evaluation unit can also be accommodated (partially or completely) in this assembly group.
  • the evaluation unit can be provided externally to the assembly and/or at least the light detection unit (for example by a server or other, in particular electronic, computing unit) that communicates with the other components of the system. This communication does not (but can) take place immediately. It would also be conceivable for corresponding data to be initially recorded by the system, then stored in a memory (in particular in the system) and evaluated by the evaluation unit at a later point in time.
  • the assembly and/or the housing can have a (maximum) diameter (defined in particular as the distance between two points of the pair of points that are the greatest distance from one another) of no more than 50 cm or no more than 30 cm or no more than 14 cm and/or at least 5 cm .
  • the assembly may weigh no more than 4.0 kg, or no more than 1.0 kg, or no more than 500 g, and/or at least 40 g.
  • the system can have several polarization filters (possibly as a polarization filter unit and/or assembly). If this is the case, they may have a different orientation.
  • the (respective) color filter in particular the bandpass filter, can be provided within a camera module.
  • the system can be expandable with external optics (e.g. a lens).
  • the system can have at least one additional device, in particular at least one plug-in module, such as at least one camera, at least one remote release and/or at least one power bank.
  • the system can be used to communicate with at least one other system and/or a (other) external device, in particular wirelessly, preferably via WLAN and/or Bluetooth, and/or wired, e.g. g. via USB/USB-C.
  • an image processing system for obtaining 3D spatial information which comprises an optical system of the above type.
  • the above-mentioned object is also achieved in particular by using an optical system of the type described above and/or below for obtaining 3D spatial information.
  • the system can preferably work according to the time-of-flight principle and/or have at least one TOF camera (possibly in addition to at least one RGB camera).
  • the invention is based on the evaluation of polarization information of the light reflected (or backscattered) from the surface of an object.
  • a number of (3D) images can be recorded using the optical device, with a different polarization state being able to be emphasized in each case.
  • This filtering of the polarization component can be adjusted quickly (in the range of microseconds, ie in particular 1 to 1000 microseconds or even nanoseconds, in particular 1 to 1000 ns), precisely, reliably and with little maintenance.
  • a central component can be seen in the optical modulator unit, which can enable this rapid adjustment.
  • a similar effect could also be achieved with the mechanical movement (rotation) of a (commercially available) polarization filter.
  • a mechanical movement (rotation) is not comparable or insufficient in terms of speed, precision and reliability.
  • one idea is that light impinging on a filter is (before) rotated in its polarization with an optical modulator unit (instead of rotating a polarization filter). After the polarization has been filtered, such a rotation can optionally be rotated back again by a further optical modulator unit (comprising one or more modulator(s)).
  • an optical device can be provided that allows an increase in accuracy through fast, precise, reliable and low-maintenance filtering of the corresponding polarization component.
  • the filtering is achieved in particular by a combination of an optical modulator (or several optical modulators) and a polarization filter (or several polarization filters).
  • the device according to the invention creates a possibility of effectively influencing the contrast in a camera image during an image recording or between image recordings. This is particularly advantageous precisely in image processing, since the contrast can be optically adjusted in the event of a change in the corresponding examination object (eg by software command by a computing unit). This enables a comparatively high degree of flexibility and a comparatively stable application.
  • polarization information eg gray value images
  • polarization information is obtained in an advantageous manner as a function of the filtered polarization state.
  • rapid switching between the polarization states (angles of rotation) to be filtered is achieved.
  • This in turn enables the polarization information to be used effectively in the (industrial) application.
  • the polarization manipulator (between the polarization filter and the light receiving device) comprises at least one (additional/second) optical modulator unit.
  • This allows the polarization to be rotated back if necessary (at least partially, at any angle) after rotation and filtering, so that the effect of rotating a standard polarizing filter by 90 degrees can be approximated or (identically) simulated if necessary.
  • the overall influence of the optical modulation units may be limited to the fact that filtering is carried out according to the polarization and no (actually unnecessary and/or possibly even undesirable) permanent rotation of the polarization is brought about. This may be advantageous if the light detector has polarization-dependent sensitivity.
  • At least one (additional) camera preferably at least one time-of-flight camera (in particular a PMD camera, preferably comprising a PMD sensor, in particular PMD chip, where PMD stands for Photonic Mixing Device), can be provided, which may
  • Images delivered by a time of flight already contain distance information, which is why one can also speak of 3D images.
  • the use of a time-of-flight camera in the device according to the invention is particularly advantageous because in this way 3D images can be produced with an accuracy in the micrometer range (1 micrometer to 1000 micrometers) or even in the nanometer range (1 nanometer to 1000 nanometers) (e.g. 1 nanometer - 1,000 micrometers, preferably 1 nanometer - 500 micrometers, more preferably 1 nanometer - 200 micrometers, even more preferably 1 nanometer - 1000 nanometers).
  • a further polarization and filter unit (comprising at least one modulator unit and at least one polarization filter) (directly and/or at a small distance) is constructed in the reverse order, in particular with regard to the order of the components (i.e. in particular with regard to the order of the optical modulator and polarization filter). of, for example, less than 10 mm) arranged in front of the light generating device.
  • Such a further (second) polarization and filter unit can be arranged and configured such that the light first passes through the polarization filter and then through the optical modulator unit. In particular when optically active materials are illuminated and examined, the incident polarization is changed by the optically active material.
  • the use of the (additional) polarization and filter unit in front of the light generation unit is particularly advantageous since the entire polarization information can continue to be separated and processed here.
  • the light-generating device emits polarized light (or light with an, in particular clear, preferred direction of polarization). In a further preferred embodiment, the light-generating device emits unpolarized light (or light without a, in particular clear, preferred direction in the polarization). Especially when using unpolarized light, the desired information can be determined quickly and precisely.
  • the light generating unit comprises (at least one) laser. This is particularly advantageous in the case of larger distances, since lasers produce a strong light that can be easily collimated.
  • the light generating unit comprises at least one LED, possibly at least 10 LEDs, optionally at least 100 LEDs.
  • the light generating device in particular the LEDs are) operated in a pulsed and/or modulated manner (particularly preferably according to the PWM principle) (with a corresponding pulse generation and/or modulation device being provided can be). Pulsed operation of the LEDs allows them to (briefly) absorb a higher current, which means that greater light intensities are possible.
  • a comparatively large number of LEDs enables homogeneous illumination of the reflecting object, which means that larger objects can also be detected in their geometric shape. Furthermore, it is advantageous that pulsed operation of the LED lighting or the flashing of the LEDs reduces the influence of extraneous light that does not originate from the light generating device, and the quality of the image information is thus increased.
  • the respective optical modulator preferably comprises, in particular an electro-optically controlled, liquid crystal arrangement or consists of such. This has the advantage that the polarization can be rotated very quickly and reliably.
  • the respective optical modulator can comprise at least (or precisely) one electro-optical and/or at least (or precisely) one magneto-optical and/or at least (or precisely) one acousto-optical device.
  • the polarization manipulator (before the light enters) includes a quarter-wave plate. This allows circularly polarized light to be used (instead of linearly polarized light).
  • parallelization optics for parallelizing incoming light beams can be arranged in front of the polarization manipulator.
  • the respective optical modulator may (in an active state) have a slow axis which is preferably designed to be oriented or orientable perpendicular to the direction of light propagation and/or at a 45 degree angle to the transmission direction of the polarization filter.
  • the optical modulator (in the active state) can act like a half-wave plate.
  • the at least one optical modulator (in an active state) can have a slow axis, which is preferably designed in such a way that it is aligned or can be aligned in the longitudinal direction (i.e. in particular in the direction of propagation of the light passing through it), the optical Modulator possibly a (continuous) phase shift (and thus polarization rotation) allows.
  • the optical device can have a control device for (time-dependent) control of the respective modulator unit or the respective optical modulator.
  • the image recording can be made possible for a number of different polarization states (or polarization angles), with one image being able to be recorded for each polarization state.
  • This is advantageous in that (possibly one after the other) all the polarization information contained in the light can be recorded and, if necessary, individual images can be processed (separately from one another), so that the information can be used effectively.
  • redundancies can be generated in this way, which make it possible to obtain more precise and more reliable information from an algorithm that processes the images.
  • Fig. 1 an optical system according to the invention in a schematic
  • Fig. 2 shows a detail of the system according to the invention in a schematic
  • the optical system 9 shows an embodiment of the optical system 9 according to the invention.
  • This includes an RGB camera 10 (RGB camera module) and a polarization and filter unit 11.
  • the system 9 is configured to determine 3D information regarding an object 12 to be measured.
  • the object 12 is illuminated by sunlight 13 (a light-generating device would also be conceivable for reference number 13, in particular as a component of the system).
  • the polarization and filter unit 11 is shown in greater detail in FIG. Accordingly, the polarization and filter unit 11 comprises a plurality of modulators 14 (in this case four, which is optional, however) (which can in particular be in the form of liquid crystals), a polarization filter 15 and a color filter, in particular a bandpass filter 16.
  • polarized light basically contains 3D spatial information (cf. also WO 2018/033446 A1).
  • the system 9 can also have a gyroscope 18 and, as a light generation unit 19, specifically an LED light with a diffuser (not shown in the figures).
  • the object 12 can be irradiated with (at least essentially) unpolarized light from the light source (for example LED with diffuser).
  • the light source for example LED with diffuser.
  • the integrated LED-based light source and/or an external light source e.g. sun, room lighting and/or the like.
  • the light is now (in interaction with the object 12) partially polarized by reflection and/or scattering.
  • the strength (or extent) of the polarization depends on the angle of the beams to the scattering or reflecting surface. Specifically, it is assumed here that not only reflection but also scattering polarizes light beams. Polarization is generally present with scattering and/or diffuse reflection.
  • a first modulator 14 (far right in FIG. 2) can (if it is in an optically active state or is switched accordingly) rotate the polarization of all individual photons by a specific angle. When this modulator 14 is inactive, the polarization is not (or at least not substantially) changed.
  • An input of a second modulator 14 (half right in FIG. 2) can preferably be adapted, in particular optimized, to the polarization directions which usually emerge from the modulator 14 on the far right.
  • the second modulator (half right in FIG. 14) can also rotate the polarization if it is switched optically active. Again, no (or no significant) rotation occurs when the second modulator is not switched optically active.
  • a third (half-blink in FIG. 2) and fourth (far left in FIG. 2) modulators are preferably configured and constructed analogously to the first and second modulators, respectively.
  • the polarization filter 15 can now let through photons of a (specific) polarization direction.
  • the polarization and filter unit 11 according to FIGS. 1 and 2 can supply data of a quality comparable to that of a rotatable polarization filter.
  • the present solution is comparatively inexpensive, requires little maintenance and has a comparatively high level of repeatability.
  • the polarization directions (states) can possibly be determined somewhat less precisely (or noise can be comparatively high).
  • the color filter, in particular bandpass filter 16 noise can be suppressed by reducing a wavelength range that is passed through, and thus accuracy can be increased (the use of a triple color filter, in particular bandpass filter for the colors or Red, green and blue channels are used).
  • the photons hit the RGB camera 10 and can optionally be converted into an image there (or in an optionally external evaluation unit). Spatial information can be extracted with comparatively high accuracy from (successive) intensity comparisons.
  • a combination of LED and diffuser ensures a simple and effective "unpolarized world assumption" (unpolarized world assumption) and can ensure a comparatively high brightness in a corresponding wavelength range, in particular to ensure a short exposure time of the camera 10
  • the system 9 can also be used in a mobile (hand-held) manner.
  • the system can be designed as a mobile terminal, in particular comprising a processor, an electronic memory and a display.
  • a weight of the system can be less than 1 kg, possibly less than 500 g.
  • polarization can also occur with diffuse radiation and contain spatial information (even if the literature often only speaks of polarization through reflection).
  • the use of polarization by scattering has not been described in the present context.
  • liquid crystal instead of using a complex modulator (liquid crystal), a combination of several (simple) liquid crystal cells is particularly preferred and particularly economical.
  • the color filter in particular the bandpass filter, preferably reduces noise and can increase the accuracy, for example, by at least a factor of 2 or even at least a factor of 3.
  • the color, in particular bandpass, filter preferably has a transmission width of at most 200 nm, more preferably at most 120 nm, even more preferably at most 80 nm, even more preferably at most 60 nm, even more preferably at most 40 nm and/or at least 1 nm or at least 10 nm. Since scattering can occur in a comparatively deep area of material (compared to reflection), a respective color of the object to be measured (or a color of the same) can have a relevant effect on the measurement. For this reason in particular, a system with a single color, in particular bandpass filter and NIR lighting and/or a triple color, in particular bandpass filter and RGB lighting is particularly preferred.

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Radar, Positioning & Navigation (AREA)
  • Remote Sensing (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • General Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Optical Radar Systems And Details Thereof (AREA)
  • Length Measuring Devices By Optical Means (AREA)
  • Mechanical Light Control Or Optical Switches (AREA)

Abstract

L'invention concerne un système optique pour obtenir des informations spatiales 3D dans une région spatiale, en particulier pour détecter des informations 3D concernant un objet, comprenant : - un dispositif de réception de lumière (110) comprenant au moins un détecteur de lumière qui peut être ou est orienté vers la région spatiale ; - une unité de modulateur optique (106) pour faire tourner une polarisation de lumière traversant l'unité de modulateur (106) ; et - au moins un filtre de polarisation (111) qui est situé optiquement en aval de l'unité de modulateur ; au moins un filtre passe-bande étant disposé optiquement en aval du filtre de polarisation et/ou l'unité de modulateur comprenant au moins deux modulateurs optiques.
EP22709973.6A 2021-03-11 2022-02-14 Système optique pour obtenir des informations spatiales 3d Pending EP4305447A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102021105888.0A DE102021105888A1 (de) 2021-03-11 2021-03-11 Optisches System zur Gewinnung von 3D-Rauminformationen
PCT/EP2022/053494 WO2022189094A1 (fr) 2021-03-11 2022-02-14 Système optique pour obtenir des informations spatiales 3d

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EP4305447A1 true EP4305447A1 (fr) 2024-01-17

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US (1) US20240125938A1 (fr)
EP (1) EP4305447A1 (fr)
CN (1) CN117178195A (fr)
DE (1) DE102021105888A1 (fr)
WO (1) WO2022189094A1 (fr)

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DE102021105888A1 (de) 2022-09-15
WO2022189094A1 (fr) 2022-09-15
CN117178195A (zh) 2023-12-05

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