WO2020212014A1 - Dispositif d'inspection en lumière transmise et procédé d'inspection en lumière transmise pour l'inspection de parois latérales de récipients - Google Patents

Dispositif d'inspection en lumière transmise et procédé d'inspection en lumière transmise pour l'inspection de parois latérales de récipients Download PDF

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Publication number
WO2020212014A1
WO2020212014A1 PCT/EP2020/056004 EP2020056004W WO2020212014A1 WO 2020212014 A1 WO2020212014 A1 WO 2020212014A1 EP 2020056004 W EP2020056004 W EP 2020056004W WO 2020212014 A1 WO2020212014 A1 WO 2020212014A1
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WO
WIPO (PCT)
Prior art keywords
analyzer
matrix
light
linear polarization
polarization directions
Prior art date
Application number
PCT/EP2020/056004
Other languages
German (de)
English (en)
Inventor
Rainer Kwirandt
Original Assignee
Krones Ag
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 Krones Ag filed Critical Krones Ag
Priority to CN202080028735.9A priority Critical patent/CN113711019A/zh
Publication of WO2020212014A1 publication Critical patent/WO2020212014A1/fr

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Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
    • G01N21/84—Systems specially adapted for particular applications
    • G01N21/88—Investigating the presence of flaws or contamination
    • G01N21/90—Investigating the presence of flaws or contamination in a container or its contents
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
    • G01N21/84—Systems specially adapted for particular applications
    • G01N21/88—Investigating the presence of flaws or contamination
    • G01N21/90—Investigating the presence of flaws or contamination in a container or its contents
    • G01N21/9018—Dirt detection in containers
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
    • G01N21/84—Systems specially adapted for particular applications
    • G01N21/88—Investigating the presence of flaws or contamination
    • G01N21/90—Investigating the presence of flaws or contamination in a container or its contents
    • G01N21/9036—Investigating the presence of flaws or contamination in a container or its contents using arrays of emitters or receivers
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
    • G01N21/84—Systems specially adapted for particular applications
    • G01N21/88—Investigating the presence of flaws or contamination
    • G01N21/8806—Specially adapted optical and illumination features
    • G01N2021/8845—Multiple wavelengths of illumination or detection
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
    • G01N21/84—Systems specially adapted for particular applications
    • G01N21/88—Investigating the presence of flaws or contamination
    • G01N21/8806—Specially adapted optical and illumination features
    • G01N2021/8848—Polarisation of light

Definitions

  • the invention relates to a transmitted light inspection device and a transmitted light inspection method for the side wall inspection of containers with the features of the preamble of claims 1 and 10, respectively.
  • Such transmitted light inspection devices and methods are usually used in beverage processing plants to detect transparent foreign bodies, such as film residues, in containers.
  • the containers could, for example, be bottles into which a drink is filled after the transmitted light inspection.
  • the transmitted light inspection device usually comprises a conveyor for transporting the containers and at least one inspection station attached to it in order to illuminate the containers with polarized light.
  • the containers are guided between a lighting device with a downstream polarizer and a camera system with an upstream analyzer and are thus illuminated with the polarized light and recorded with the camera system.
  • the transparent foreign bodies often have stress birefringence and / or molecule-induced birefringence, they can be better recognized when transilluminated with polarized light and are shown as darker areas in the camera image. They can then be identified in the camera image using image processing algorithms known per se.
  • linear polarization filters are therefore usually used.
  • DE 20 2013 100 834 U1 discloses a device for detecting soiling on containers in which the polarizer is designed for circular or elliptical polarization of the light emitted by the lighting device and detects the container with two cameras which are preceded by analyzers with different polarization directions in order to detect contamination behind labels particularly well.
  • the polarizer is designed for circular or elliptical polarization of the light emitted by the lighting device and detects the container with two cameras which are preceded by analyzers with different polarization directions in order to detect contamination behind labels particularly well.
  • the polarizer is designed for circular or elliptical polarization of the light emitted by the lighting device and detects the container with two cameras which are preceded by analyzers with different polarization directions in order to detect contamination behind labels particularly well.
  • the object of the present invention is therefore to provide a transmitted light inspection device and a transmitted light inspection method with which it is possible to detect transparent foreign bodies in containers even more reliably in a container processing system.
  • the invention provides a transmitted light inspection device with the features of claim 1.
  • Advantageous embodiments are mentioned in the subclaims.
  • the transparent foreign bodies can best be recognized if at least four different linear polarization directions are recorded with the at least one analyzer, for example 0 °, 45 °, 90 ° and 135 °. Because the camera system and the at least one analyzer are designed to detect the four different linear polarization directions simultaneously, it is possible to carry out the transmitted light inspection with little effort even with a high throughput of a container processing system. In addition, weakly polarizing foreign bodies can be detected particularly reliably.
  • the transmitted light inspection device can be arranged in a container processing system. In the same way, the transmitted light inspection device can be arranged in a system for producing the containers.
  • the transmitted light inspection device can be arranged downstream of a switch in order to sort out containers in which one or more transparent foreign bodies have been detected by the at least one inspection station.
  • the rejected containers can be cleaned or recycled.
  • the switch can be designed to feed containers without transparent foreign bodies to a container treatment machine, for example a filler.
  • the containers can in particular be glass bottles, but plastic bottles are also conceivable.
  • the containers can be provided to hold beverages, hygiene articles, pastes, chemical, biological and / or pharmaceutical products.
  • the containers can be provided for any flowable or fillable media.
  • the containers can be empty containers or containers filled with a product.
  • the transparent foreign bodies can, for example, include remnants of film, plastic parts and the like.
  • the conveyor can preferably be designed as a linear conveyor, the lighting device with the polarizer being arranged on one side and the camera system with the at least one analyzer being arranged on the opposite side. It is also conceivable that the transporter is designed as a carousel with which the containers are transported between the lighting device with the polarizer and the camera system with the at least one analyzer.
  • the lighting device can include the light source, a lens, a diffuser and / or a diaphragm.
  • the light source can comprise an incandescent lamp, a gas discharge lamp, a fluorescent tube and / or LEDs as the lighting means.
  • the light source is preferably formed by at least one circuit board with a matrix arrangement of LEDs.
  • the light source can emit a visible light spectrum and / or an infrared light spectrum.
  • the visible light spectrum can be in a wavelength range from 380 nm to 780 nm, preferably from 440 nm to 650 nm, and / or the infrared light spectrum can be in a wavelength range from 780 nm to 3 pm, preferably from 800 nm-1 pm. It is also conceivable that the visible light spectrum and / or the infrared light spectrum are each only a monochromatic light spectrum.
  • the polarizer can be arranged within the lighting device or in the area of a light exit of the lighting device.
  • the polarizer and / or the analyzer can be designed at least in sections in the manner of a disk or film.
  • the polarizer and / or the analyzer can be a polarizing film.
  • the polarizer and / or the analyzer can, independently of one another, include a circular polarizing filter. This allows foils to be recognized in all rotational positions. For practical reasons, it is possible to avoid using 4 lighting devices with differently aligned linear polarizers.
  • the lighting device is therefore preferably equipped with a circular polarizing filter as the polarizer, so that circular light is emitted in the direction of the container and the camera.
  • the camera system can include a camera and a lens.
  • the camera can comprise a line or matrix sensor, for example a CCD sensor or CMOS sensor.
  • the camera system can be connected to an image processing unit via a data line in order to receive camera images of the to evaluate illuminated containers with regard to the transparent foreign bodies.
  • the image processing unit is integrated into the camera system.
  • the linear polarization directions detected with the at least one analyzer and the camera system can include 0 °, 45 °, 90 ° and 135 °. In other words, the four different linear polarization directions can each be rotated by 45 ° with respect to one another.
  • the at least one analyzer can be at least one linear polarization filter. In other words, the at least one analyzer can be designed as at least one linear polarizer.
  • a mirror cabinet is connected upstream of the camera system in order to capture several container sides of a container next to one another as image sectors of a camera image.
  • the transmitted light inspection device can comprise a control device in order to control the lighting device and / or the camera system.
  • the control device can comprise an image processing unit in order to receive camera images from the camera system and to evaluate them for transparent foreign bodies.
  • the control device can be designed to control the transporter and / or to detect transport positions of the containers. It is conceivable that the control device comprises a digital processor (CPU), a memory unit, an interface unit, an input and / or an output unit.
  • CPU digital processor
  • the camera system can comprise an objective and a matrix sensor, the at least one analyzer being designed as an analyzer matrix which is arranged between the objective and light-sensitive sensor elements of the matrix sensor in order to simultaneously detect the at least four different linear polarization directions with the matrix sensor.
  • the camera system can be set up in a particularly simple manner, since the four different linear polarization directions are recorded with exactly one matrix sensor and not with several matrix sensors, "whereby the at least one analyzer is designed as an analyzer matrix that is arranged between the lens and light-sensitive sensor elements of the matrix sensor "can mean here that the analyzer matrix is arranged directly in front of a Bayer filter and / or the light-sensitive sensor elements of the matrix sensor.
  • the matrix sensor can comprise the analyzer designed as an analyzer matrix as an element integrated in front of the light-sensitive sensor elements Chamber system even more compact and simple It is conceivable that the analyzer designed as an analyzer matrix is arranged between a microlens array and light-sensitive sensor elements of the matrix sensor ivtypes possible without compromising the image quality to affect. However, it is also conceivable that the analyzer designed as an analyzer matrix is arranged directly in front of a microlens array of the matrix sensor.
  • the analyzer embodied as an analyzer matrix can comprise a plurality of polarizer elements arranged in a matrix, which are each assigned to one of the light-sensitive sensor elements and which are preferably aligned alternately in the at least four different linear polarization directions.
  • each light-sensitive sensor element of the matrix sensor is assigned a different polarizer element of the analyzer, so that a particularly high-resolution image of the container is possible, taking into account the polarization of each pixel.
  • Each light-sensitive sensor element can correspond to a pixel of a camera image output by the matrix sensor, in particular with a polarizer element of the analyzer being assigned to each light-sensitive sensor element.
  • the polarizer elements arranged in the matrix can each be designed as polarization filters, with the polarizer elements being arranged in the matrix rotated relative to one another in such a way that the four different linear polarization directions are detected.
  • the linear polarization directions are 0 °, 45 °, 90 ° and 135 °.
  • the polarizer elements arranged in the matrix can be grouped in such a way that in each case four adjacent polarizer elements are aligned in the at least four different linear polarization directions and form a group.
  • the different linear polarization directions are recorded alternately with the light-sensitive sensor elements of the matrix sensor, which results in a high spatial resolution in the camera image, taking the polarization into account.
  • the groups themselves are arranged in a matrix-like manner on the matrix sensor. This means that the different linear polarization directions are recorded alternately along both axes of the matrix sensor.
  • the matrix sensor can be an image sensor of the Sony IMX250MZR or IMX250MYR type, in particular wherein the analyzer designed as an analyzer matrix is arranged between a microlens array and a pixel array of the matrix sensor.
  • the analyzer designed as an analyzer matrix is arranged in a beam path of the camera system directly in front of the microlens array of a matrix sensor.
  • the camera system comprises at least four cameras each with an analyzer, a lens and a matrix sensor, the analyzers of the at least four cameras being aligned in the at least four different linear polarization directions in order to capture them in multiple camera images.
  • the analyzers each include a linear polarization filter.
  • the linear polarization filters can be rotated relative to one another in such a way that the linear polarization directions 0 °, 45 °, 90 ° and 135 ° can be detected.
  • the camera system comprises at least four cameras with an objective and with a matrix sensor, the at least one analyzer comprising two polarization dividers in order to divide two of the at least four different linear polarization directions between two of the at least four cameras .
  • the image fields can be superimposed by two cameras so that the image perspective in the corresponding camera images is similar or even exactly the same. In this way, the assignment of image areas on the container in the camera image can be supported during the evaluation.
  • a polarization splitter can be an optical element that allows a first linear polarization direction to pass through and reflects a second linear polarization direction that is rotated by 90 °.
  • the polarizer of the lighting device can preferably comprise a circular or elliptical polarization filter. Extensive investigations by the applicant have shown that this, in combination with the setting of the four different linear polarization directions, leads to particularly reliable detection of the transparent foreign bodies. In principle, however, a linear polarization filter is also conceivable as the polarizer of the lighting device.
  • the camera system is designed with filters for the separate detection of different light wavelengths, in particular with at least one Bayer filter or with at least one pixel-by-pixel color filter in order to also detect different light wavelengths of the polarized light in addition to the different linear polarization directions.
  • filters for the separate detection of different light wavelengths in particular with at least one Bayer filter or with at least one pixel-by-pixel color filter in order to also detect different light wavelengths of the polarized light in addition to the different linear polarization directions.
  • This makes the recognition particularly reliable, since the polarizing effect of the transparent foreign bodies can also depend on the light wavelength.
  • This can improve recognition in colorless containers.
  • it can be a Sony IMX250MYR matrix sensor which, in addition to polarization, also enables color detection.
  • the invention provides a transmitted light inspection method for side wall inspection of containers with the features of claim 10 ready.
  • Advantageous embodiments of the invention are specified in the subclaims.
  • the transparent foreign bodies can best be recognized when the at least one analyzer is used for a few at least four different linear polarization directions can be recorded. Because the camera system with the at least one analyzer simultaneously detects the four different linear polarization directions, it is possible to reliably carry out the transmitted light inspection even with a high throughput of a container processing system with little effort. In addition, foreign bodies with weak polarity can be detected particularly reliably.
  • the transmitted light inspection method can include the features described above in relation to the transmitted light inspection device individually or in any combination, in particular according to one of claims 1 - 9. It is conceivable that the transmitted light inspection method with the transmitted light inspection device described above, in particular according to one of claims 1 - 9 is carried out.
  • the transmitted light inspection method can preferably be used for the inspection of empty bottles, in particular for the inspection of the bottom and / or side walls.
  • the through-light inspection method is used in full bottle inspection to detect floating plastic parts, in particular in side wall inspection.
  • the at least one analyzer can divide the four different linear polarization directions after an objective and in front of light-sensitive sensor elements of a matrix sensor in such a way that the four different linear polarization directions are recorded in a camera image of the matrix sensor.
  • the camera system can be constructed in a particularly simple manner, since the four different linear polarization directions are recorded with exactly one matrix sensor and not with several matrix sensors.
  • the four different linear polarization directions are recorded by at least four cameras each with an analyzer, an objective and each with a matrix sensor. This means that more cameras are necessary, but the detection of the containers is even more high-resolution locally.
  • the different linear polarization directions are recorded by at least four cameras, each with an objective and with a matrix sensor each, the at least one analyzer comprising two polarization splitters, with which two of the at least four different linear polarization directions are applied to two of the at least four cameras can be shared.
  • the image fields can be superimposed by two cameras so that the image perspective in the corresponding camera images is similar or even exactly the same. This allows the assignment of image areas on the container in the camera image to be supported during the evaluation.
  • FIG. 1 shows an exemplary embodiment according to the invention of a transmitted light inspection device in a side view
  • FIG. 2 shows a detailed illustration of the matrix sensor with an analyzer designed as an analyzer matrix in a front view
  • FIG. 3 shows a further exemplary embodiment according to the invention of a transmitted light inspection device with four cameras in front of each of which an analyzer is arranged, in a side view;
  • FIG. 4 shows a further exemplary embodiment according to the invention of a transmitted light inspection device with four cameras and two polarization splitters in a side view.
  • FIG. 1 an exemplary embodiment according to the invention of a transmitted light inspection device 1 is shown in a side view. You can see the conveyor 3 and the associated inspection station 4, 5 for illuminating the side wall 2a of the container 2 with the polarized light L.
  • the conveyor 3 is designed here, for example, as a linear conveyor, in order to transport the containers 2 between the lighting device 4 and the camera system 5.
  • the containers 2 can preferably be transported continuously and continuously captured by the camera system 5.
  • the lighting device 4 comprises a light source 4.1 for emitting a visible and / or infrared light spectrum.
  • the light source 4.1 is formed with a plurality of LEDs that emit white light, preferably in a wavelength range from 380 nm to 780 nm. LEDs that contain several chips for different colors are preferably used. This allows a matching of the light color to the color of the containers. It is also conceivable that the light source 4.1 is designed with a large number of LEDs which emit infrared light, preferably in a wavelength range from 780 nm to 3 miti.
  • the light source 4.1 is followed by the polarizer 4.2, which is designed for the circular polarization of the light spectrum emitted by the light source 4.1.
  • the unpolarized light from the light source 4.1 is circularly polarized by the polarizer 4.2 and thus emitted as polarized light L.
  • the camera system 5 comprises an objective 5.3, an analyzer 5.M and a matrix sensor 5.2, the analyzer 5.M being designed as an analyzer matrix which is positioned between the objective 5.3 and light-sensitive sensor elements (5.21) of the matrix sensor 5.2 is arranged.
  • the analyzer 5.M designed as an analyzer matrix is designed as an integrated element of the matrix sensor 5.2.
  • the matrix sensor 5.2 and the analyzer 5.M designed as an analyzer matrix can be the Sony image sensor of the type IMX250MZR (monochrome) or IMX250MYR (color). The more precise structure of the matrix sensor 5.2 and of the analyzer 5.M is explained in more detail below with reference to FIG.
  • the container 2 With the lens 5.3, the container 2 is imaged via the analyzer 5.M onto the matrix sensor 5.2 of the camera system 5. Consequently, with the camera system 5, the side wall 2a of the container 2 can be detected in four different directions of polarization simultaneously.
  • the camera system 5 is preceded by a mirror cabinet (not shown here). This makes it possible to display several container sides side by side as image sectors in the camera system 5. With the mirror cabinet and the lens 5.3, for example, at least two views of the container 2 can be mapped next to one another from different angles on the matrix sensor 5.2 and thus recorded in a camera image.
  • control device 6 can be seen, with which the lighting device 4 and the camera system 5 can be controlled. It is conceivable that the control device 6 comprises an image processing device for evaluating the camera images from the camera system 5. In addition, it is also conceivable that the control device 6 controls the lighting device 4, for example based on the signal from a light barrier, in such a way that it emits a light pulse at the moment when the container 2 in front of the lighting device 4 is in a field of view of the camera system 5.
  • FIG. 2 shows a detailed representation of the matrix sensor 5.2 with an analyzer 5.M designed as an analyzer matrix in a front view. The matrix sensor 5.2 can be seen, which serves as an image sensor in the chamber system shown in FIG.
  • the matrix sensor 5.2 corresponds to the usual structure of CMOS or CCD image sensors, in which the light-sensitive sensor elements 5.21 are arranged in a matrix-like grid in order to record a camera image.
  • CMOS or CCD image sensors in which the light-sensitive sensor elements 5.21 are arranged in a matrix-like grid in order to record a camera image.
  • a hexagonal arrangement of the light-sensitive sensor elements 5.21 is also conceivable.
  • the light-sensitive sensor elements 5.21 are preceded by the analyzer 5.M, which is designed as an analyzer matrix and comprises a multiplicity of polarizer elements 5.M1-5M4 arranged in a matrix.
  • the matrix of the polarizer elements 5. Ml-5.M4 corresponds to the position of the light-sensitive sensor elements 5.21 of the matrix sensor 5.2.
  • the polarization elements 5. Ml-5.M4 are each assigned to one of the light-sensitive sensor elements 5.21 and, as can be seen in detail D, are alternately aligned in four different linear polarization directions.
  • the polarizing elements 5. Ml-5.M4 are arranged in the polarization directions 0 °, 40 °, 90 ° and 135 °. It is conceivable that the analyzer 5.M configured as an analyzer matrix is arranged between a microlens array and the light-sensitive sensor elements 5.21 of the matrix sensor 5.2.
  • Ml - 5.M4 arranged in the matrix are grouped in such a way that four adjacent polarizer elements 5.
  • Ml - 5.M4 are each aligned in the four different linear polarization directions and the groups G form a group G each also arranged like a matrix.
  • the matrix sensor 5.2 comprises a Bayer filter in order to separate colors in the camera image in addition to the polarization and thus to detect different light wavelengths separately.
  • the transparent foreign bodies F can be recognized even more reliably on the basis of the color information.
  • the transmitted light inspection device 1 shown in FIG. 1 can be constructed particularly simply with only one camera.
  • the containers 2 are transported with the conveyor 3 to the inspection stations 4, 5 attached thereto and are there with them polarized light L shines through.
  • the initially unpolarized light from the light source 4.1 is, for example, circularly polarized with the polarizer 4.2 and emitted as the polarized light L.
  • the polarization of the light during transillumination is influenced by the transparent foreign bodies F, for example rotated by stress birefringence.
  • the container 2 thus illuminated is captured with the camera system 5, which comprises the matrix sensor 5.2 and the analyzer 5.M designed as an analyzer matrix. As a result, 5 different linear polarization directions are recorded simultaneously in a camera image of the camera system.
  • the transparent foreign bodies F Depending on the arrangement and properties of the transparent foreign bodies F, they then appear darker or lighter than the remaining areas of the side wall 2a of the container 2 with a certain linear polarization direction in the camera image, so that they can be recognized with image processing methods that are customary per se.
  • FIG. 3 a further exemplary embodiment according to the invention of a transmitted light inspection device 1 with four cameras 5A-5D is shown in a side view, in front of each of which an analyzer 5.F1-5.F4 is arranged.
  • the exemplary embodiment shown in FIG. 3 differs from that in FIG. 1 only in the structure of the camera system 5.
  • the features of the lighting device 4 and the conveyor 3 of the exemplary embodiment in FIG. 1 therefore also apply accordingly to FIG. 3 and also below for Figure 4.
  • the lenses 5.3 of the cameras 5A-5D are each preceded by an analyzer 5.Fl-5.F4. These are, for example, linear polarization filters that are rotated in different rotational positions around the axis of the lens 5.3 such that they each allow a different linear polarization direction to pass through, for example the directions 0 °, 45 °, 90 ° and 135 °. As a result, one of the linear polarization directions can be recorded with one of the cameras 5A-5D. As a result, although the structure is more complex, it enables an even higher spatial resolution in the camera images.
  • FIG. 4 another exemplary embodiment according to the invention of a transmitted light inspection device 1 with four cameras 5A-5D and two polarization splitters 5.T1-5.T2 is shown in a side view.
  • the exemplary embodiment in FIG. 4 differs from that in FIG. 3 only in the type of analyzers 5.T1-5T2.
  • the four different linear polarization directions are not divided by polarization filters but by the polarization splitters 5.T1-5T2 shown on the four cameras 5A-5D, whereby the image fields of cameras 5A, 5B and 5C, 5D can be superimposed so that the image perspective in the corresponding camera images is similar or even exactly the same.
  • the assignment of image areas of the container 2 in the camera image can be supported during the evaluation.
  • the containers 2 are transported by the conveyor 3 to the inspection stations 4, 5 attached to them, where they are transilluminated with polarized light L.
  • the initially unpolarized light from the light source 4.1 is, for example, circularly polarized with the polarizer 4.2 and emitted as the polarized light L.
  • the polarization of the light during transillumination is influenced by the transparent foreign bodies F, for example rotated by stress birefringence or absorbed in a certain direction.
  • the container 2 thus illuminated is captured with the four cameras 5A-5D in the four different linear polarization directions.
  • the cameras 5 A-5 B are either preceded by the polarization filters 5.
  • the camera system 5 and the at least one analyzer 5.M, 5.F1-5.F4 or 5.T1-5.T2 are designed for the four different linear polarization directions simultaneously As can be seen, it is possible to carry out the transmitted light inspection of the side wall 2a of the container 2 with little effort even with a high throughput of a container processing system. In addition, weakly polarizing foreign bodies F can be identified particularly reliably.

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  • Health & Medical Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Chemical & Material Sciences (AREA)
  • Analytical Chemistry (AREA)
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  • Investigating Or Analysing Materials By Optical Means (AREA)

Abstract

L'invention concerne un dispositif d'inspection en lumière transmise (1) pour l'inspection de parois latérales de récipients (2), comportant un convoyeur (3) pour le transport des conteneurs (2) et présentant au moins un poste d'inspection (4, 5), qui est fixé au convoyeur (3), pour la transmission de lumière polarisée (L) à travers les conteneurs (2). L'au moins un poste d'inspection (4, 5) comprend un dispositif d'éclairage (4) comportant une source de lumière (4.1) et un polariseur en aval (4.2) et un système de caméra (5) comportant au moins un analyseur (5.M, 5.F1 -5.F4, 5.T1 -5.T2). Le système de caméra (5) et l'au moins un analyseur (5.M, 5.F1 -5.F4, 5.T1 -5.T2) sont conçus pour détecter simultanément au moins quatre directions de polarisation linéaire différentes.
PCT/EP2020/056004 2019-04-18 2020-03-06 Dispositif d'inspection en lumière transmise et procédé d'inspection en lumière transmise pour l'inspection de parois latérales de récipients WO2020212014A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202080028735.9A CN113711019A (zh) 2019-04-18 2020-03-06 用于容器的侧壁检查的透射光检查设备及透射光检查方法

Applications Claiming Priority (2)

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DE102019205653.9A DE102019205653A1 (de) 2019-04-18 2019-04-18 Durchlichtinspektionsvorrichtung und Durchlichtinspektionsverfahren zur Seitenwandinspektion von Behältern
DE102019205653.9 2019-04-18

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WO2020212014A1 true WO2020212014A1 (fr) 2020-10-22

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WO (1) WO2020212014A1 (fr)

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WO2023057726A1 (fr) 2021-10-08 2023-04-13 Tiama Dispositif et procede opto-informatique d'analyse en lumiere traversante d'un recipient en materiau transparent ou translucide a l'aide d'une camera numerique polarimetrique
WO2023144494A1 (fr) 2022-01-28 2023-08-03 Tiama Procedes et systemes opto-informatiques d'inspection en lumière traversante d'un récipient en verre
US20230288343A1 (en) * 2020-07-29 2023-09-14 Tiama Device and method for transmission inspection of containers having at least one light-emitting diode light source

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