Measuring a fiber direction of a carbon fiber material and producing carbon fiber composite structure of an object in

description

The present invention relates to a concept for measuring a fiber direction of a carbon fiber material, such as for quality control and / or further processing and for manufacturing an object in carbon fiber composite construction.

In modern lightweight increasingly carbon fibers are used to increase the strength of so-called carbon fiber composites. In particular for safety-critical components of these composite materials, such as in aircraft, automobile, or the like, are the correct position and the correct curve, which is the direction of the carbon fibers, of crucial importance for the mechanical strength and resilience of the finished component. At any point, or at all relevant points of the workpiece, it is necessary to measure the fiber orientation or the angle at which the carbon fibers are with a certain accuracy. Typically when manufacturing a plurality of layers of carbon fiber fabrics are successively stacked and impregnated respectively with special plastics and cured. Each of these documents must be qualified in terms of Faserver run. Since the carbon fiber layers are not transparent to visible light, the test of the fiber direction must be carried out individually for each layer in each case after the application of this layer.

The fiber direction is previously measured in different ways or checked, namely a) visually by the manufacturing personnel, b) by applying markings by the manufacturing personnel, detection of markings by means of a camera system and further processing of the camera images through a corresponding software, and c) by taking of carbon fibers with a camera system whose pixel resolution must be high enough, however, that the individual carbon fibers are resolved pictorially, so that from the image data by means of special software, the direction of the carbon fibers can be determined at each location of the image.

The solutions a) and b) require the involvement of the production staff and therefore are difficult to reproduce and prone to error due to the known subjective effects. In addition, the solutions are time-consuming and therefore expensive. A completely automated test is not possible. The solution c) requires a relatively high pixel resolution of the camera used. In addition to the higher cost of a high resolution camera produced high pixel counts more image data, the result for the same frame rate to higher rer image transfer speed and more computing power for image analysis. Higher data rate and high processing power, in turn, lead to higher costs. The other way round considered this means that at a given cost, the test speed is limited. Ultimately, this means that for the examination of a particular area of ​​a carbon fiber composite component, the eligible costs determine the test speed. Another disadvantage is the fact that the fiber direction has to be calculated from the image data by software. The accuracy and reliability of results depends so much on the quality of the software. Especially when soaked with plastic fabric to detect the direction of the grain is also significantly cursory and less reliable than in ungetränktem, so-called "textile" fabric.

Accordingly, it would be desirable a concept for measuring the direction of the fibers of a carbon fiber material or a concept for the production of an object in carbon fiber composite construction, which overcomes the above disadvantages and enables cost-effective production of the same quality or accuracy.

The object of the present invention is to provide a concept for measuring a fiber direction of a carbon fiber material as well as a concept for the production of an object in carbon fiber composite construction with improved characteristics.

This object is solved by the subject matter of the appended independent claims.

The present invention utilizes the realization that it is possible to recognize the direction of the fibers ei-nes carbon fiber material of a object to be inspected based on the polarization direction of a light object to be tested, reflected from the. Applies, for example unpolarized light on carbon fibers or carbon fibers, so that's of the fibers in the fiber direction polarized reflected light. The wavelength of light is, for example, in a range of 400 to 1000 nanometers.

It is possible that the fiber direction of the carbon fiber material, such as a carbon fiber woven fabric or a carbon fiber composite material to measure pictorially by means of the polarization of light. According to an embodiment a polarization sensitive camera is used accordingly as a polarization sensor, the on-takes the object to be inspected, to obtain a spatially resolved detection of the polarization direction and thus a spatially resolved scanning direction of the fiber. Advantageously, it is not necessary for this that the resolution of the polarization-sensitive camera is sufficient to optically resolve the fibers. In other words, the spatial resolution of the polarization onssensitiven camera in the object plane of the lens of the camera can be lower than would be necessary to dissolve the structure of the fibers on the surface of the carbon fiber material, ie, the pixel repeat distance in the object plane of the objective lens may be larger as for example the fiber radius.

Advantageous implementations are subject of the dependent claims. Preferred exemplary embodiments of the present application will be explained in more detail below with reference to the figures, among which

Fig. 1 is a schematic block diagram of an apparatus for measuring a

The fiber direction of a carbon fiber material of an object to be tested according to an embodiment of the present invention;

Fig. 2 is a schematic drawing of a sensor acting as a polarization sensitive camera polarization according to an embodiment shows and

Fig. 3 shows a block diagram of a system for producing a carbon fiber composite structure in the object according to an embodiment.

Fig. 1 shows an apparatus for measuring a fiber direction of a carbon fiber material of an object to be tested according to an embodiment of the present invention. In the carbon fiber material may be a carbon fiber fabric, for example, as is symbolized in FIG. 1 by the crosshatching. However, there may also be a carbon fiber composite material. In Fig. 1 is in the object to be inspected 10 from the carbon fiber material, for example, a layer or a laminate of carbon fiber fabric, that is, for example, intended by surveying on one or more other carbon fiber layers to be applied to compose a carbon fiber composite to arise. For this purpose it is simply necessary to know the fiber directions of the carbon fiber material. The direction of the fibers can also be Benö-taken for other reasons. In Fig. 1 is an example in the dashed 12 magnification views of a front side 14 of the test object 10 and its carbon fiber material shown. Therein fiber bundles 16 are woven into a fabric 18 together. Alternatively, it may be the object already around a stack of the aforementioned carbon fiber layers - with or without a plastic matrix, namely a cured or uncured yet, act, ie a product or intermediate product of carbon fiber composite material.

The apparatus for measuring the fiber direction of the carbon fiber material 18 of the object to be inspected 10 of Fig. 1 is indicated generally at 20 and includes a light source 22, a polarization sensor 24 and, optionally, a computer 26 and optionally a monitor 28, the light source 22 is adapted to the object to be inspected 10 to illuminate. The polarization sensor 24 is adapted to detect a polarization direction of a light reflected from the object 10 to be tested, light, thus in particular of the light with which the object to be tested is illuminated by the light source 22 and is then reflected in the polarization sensor 24, wherein the polarization direction the fiber direction of the object 10 indicates on its front illuminated 14th

An established so the light source 22 is oriented so that it illuminates the check-de object 10th The light emitted from the light source 22 light 30 is for example unpolarized. It is, for example, a halogen lamp, Glühemissions lamp, LED or the like. It can also simultaneously several lamps of the same or different types from different directions the object 10 illuminate, or Mithil fe other devices such as mirrors, optical fibers or the like, an illumination be realized from several directions, ie, the light source can be more lamps and / or additional light guide means, such as a mirror, etc., have to realize an illumination of the object 10 from different directions and to thereby achieve a more complete illumination of the scanned by the polarization sensor 24 and the latter facing surface 14, thus avoiding shadowing, etc. The light spectrum the light 30, such as the average wavelength, for example, is in the range of 400 to 1000 nm. In particular, it may be the light source 22 be a broadband or narrowband light source. It is also possible to use a monochromatic light source 22. Preferably, a half-value width of the spectrum of the light source 22 is less than or equal to lOOnm in an area.

Once the light 30 incident on the object to be inspected 10, the favorable property of the carbon fiber material 18 has a positive effect, according to which the latter has a polarizing effect of the incident on the same light. Specifically, the light 30 is polarized after its reflection on the carbon fiber material of the object to be inspected 10 along a polarization direction which is along the fiber direction on the illuminated surface 14. In the enlarged section 12, showing a top view of a section of the surface 14 of the object 10 from the direction of polarization sensor 24, this is by way of example for two different positions A and B of the object to be tested illustrate light. The light reflected at the point A and incident on the polarization sensor 24 light 32 has a polarization direction of 34 A, which is parallel to the fiber direction of the fiber bundle 36A 16, which crosses the point A. At the point B, the fiber direction 36B, and thus the running parallel to the polarization direction 34B in another direction runs, namely perpendicular to ichtung 36A and 34 A, since the point B is illustrated with another fiber bundles 16th

In the polarization sensor 24, there may be one which only pointwise measures the fiber direction of the carbon fiber material 10 on the polarization direction of the reflected light at this point 32 or to a line or area sensor or a polarization sensitive camera. In the former case could, if desired, for the spatially resolved scanning the fiber direction, for example, a manipulator or a robot (not shown) may be used to by the scanned by the POLARIZA-tion sensor 24 point or place through from which reflected light is detected polarization sensor 24 to move laterally or to vary, and thus to obtain at different points A and B corresponding fiber direction measurements.

Fig. 2 shows that there may be a polarization sensitive camera sensor 24 in the polarization. According to this embodiment 24 includes the polarization sensitive camera, a pixel array 38 and a lens 40 for imaging the object to be inspected 10 on the pixel array 38. As shown in the enlarged top view 42 onto the pixel array 38 in Fig. 2, the pixels can 44 of the pixel array 38 may be grouped, for example, in Superpi-xel 46, so that the super pixel 46 each pixel 44 of the pixel array 38 aufwei-sen, which are sensitive to different polarized light, so at least a first pixel for a first polarization direction and a second pixel for a second , to different polarization direction. FIG. 2 illustrates an example that every super pixel 46 includes, for example, four pixels 44, which are sensitive to polarization directions to one another by 45 ° - spaced angular differences from each other. Another number of pixels having different polarization sensitivity is of course also possible, also as a non äquiangulare distribution of the polarization directions of these pixels. It should be noted that it is not important whether, as shown in Fig. 2, the pixels are regularly arranged irregularly in rows and columns, in a different array or, and that, in turn, the arrangement of the pixels within the super pixel 46 is equal is, or whether the arrangement of the sensitive for the different polarization directions of the pixels within the super pixel 46 varies across the pixel array 38 away. Likewise, it is also possible that the super pixel 46 are not regularly arranged in row and column directions, but selbige may also be arranged differently regularly or irregularly.

The scanning by the polarization sensor 24 is not limited to a dot-wise or areal scan, as described above. Another possibility would be a line at a time or one-dimensional scanning of the grain of the

Carbon fiber material of the object to be inspected 10 illuminated on the front panel 14. Again, a relative movement between the object 10 and polarization sensor 24 could be used to get a two-dimensional scanning of the overall fiber direction.

The polarization sensor 24 could additionally have a filter system in order from the reflected light 32, the light of a particular wavelength, such as the light of a wavelength in the above-mentioned range between 400 to 1000 nm filter out. The Pi-xelarray 38 could for example comprise an array of light-sensitive areas, above which, in turn, an array of filter structures is such that each photosensitive region produces together with a pixel of a filter structure. The individual light-sensitive areas upstream filter structures may be, for example, grid structures. In particular, it would be possible that the filter structures have structural elements with dimensions that are within the sub-wavelength range, that is smaller than the wavelength of the light 30. The filter structures can have properties of a photonic crystal. The light-sensitive areas and filter structures may be integrated together in one chip. The photosensitive regions may for example be formed by a photodiode array, a CCD array or a CMOS pixel array. Such polarization sensor is described for example in DE 102,008,014,334th

The polarization sensor 24 could also consist of a commercially available CCD or CMOS image sensor, that is, a polarization-insensitive sensor, that is, single, line or image sensor, and, arranged between the sensor and the object 10 apparatus for continuous or stepwise rotation of the polarization direction of the light 32 exist, ie a polarizing filter, whose pass direction of polarization is varied with time. The apparatus for rotating the polarization direction of the light or polarization filters with varying transmission polarization direction makes it possible in succession, that is sequential in time, receiving a plurality of images and to offset each other in a suitable manner, in order in this way the local polarization angles at each point of the surface 14 to to gain.

As has been shown in Fig. 1, the device 20 can optionally include a computer 26 and a display device 28. The computer 26 may for example be provided to the pixel values ​​of the super pixel in the case of the configuration of the polarization sensor 24 as a surface sensor in suitable scalar values, namely one or more per superpixel, convert the light reflected, inter alia, a measure of the local polarization angle 32 are on the the super-pixel location associated with the surface 14 or the fiber direction at this location. On the display device then the ortsaufge- could sparked scan the fiber direction are displayed color-coded. The computer 26 or a running program it could also drive the aforementioned optionally present manipulator 48 for producing a relative movement between the object 10 and polarization sensor 24th

The computer 26 may act as a controller from the determined via the polarization sensor 24 fiber direction of the carbon fiber material of the object 10 and location information about the object 10, the orientation of the fiber direction of the object 10 with respect to the form or shape of the object 10 in particular also determined and depends on this orientation a manipulator controls that holds the object. In other words, the control may depend control of location information on a location of the object 10 relative to the polarization sensor 24 and the fiber direction of the object manipulator for holding and changing the position of the object, to control a manipulator for stringing-create the object and another object , so that in juxtaposed state having the direction of the fibers relative to the other a predetermined orientation and / or as a function of location information on a location of the object 10 to determine relative to the polarization sensor 24 and the fiber direction of the object orientation of the fiber direction relative to a shape of the object 10 , The juxtaposition could be done so that the side 14 rests against the other object in the butted state namely for example so that the direction of the grain to an excellent preferred direction of the respective side facing the other object, such as also a carbon fiber direction having a predetermined direction of relationship, such as cross- to runs. Of course, the said manipulator might also be the one that holds the object at the location defined by the location information at the moment of detection of the polarization direction and thus the direction of the fibers. In the following an example in the context of a manufacturing system will be described for this.

Fig. 3 shows a system for the production of an object 50 in carbon fiber composite structure according to an embodiment. The system, which is generally indicated by 52, Ver-turns and includes the device 20 of FIG. 1 and a manipulator or robot 54. accepts the device 20 as described, the measurement of a fiber direction of carbon fiber layers 56. The robot 54 is adapted , the carbon fiber layers 56 under adjustment of the carbon fiber directions thereof set apart as measured by the device 20 to the object to give in this way 50 to one another. Example wise can be a controller provided which controls the robot 54 and evaluates the direction of polarization of the reflected light via specific carbon fiber directions.

The controller 58 would be controlled, for example, the manipulator or robot 50 so that the device 20 can determine the direction of the fibers of the carbon fiber sheet 56, which means that the object is 10 lit and is in the sights of the polarization sensor 24th Under this knowledge of location of the object relative to the polarization sensor for detecting the direction of polarization and detected polarization direction control would then reach 58 knowledge of an orientation of the fiber direction relative to a form or shape of the object 10 and could drive the robot 54 for example, that the current carbon fiber layer 56 is 60 so placed on already superposed other carbon fiber layers that the fiber direction of the currently be launched carbon fiber sheet 56 having the fiber direction of the currently exposed carbon fiber layer a predetermined angle, which results for example in a particularly stable form of the object 50th The object 50 is, for example, as indicated in Fig. 3, to the hull of a ship or a part of an aircraft body or a part of a motor vehicle.

A in Fig. 3 by the dashed box 60, indicated and, if appropriate, also controlled by the controller 58 means 60 could be arranged to provide the carbon fiber layers with plastic, so that the carbon fiber layers, after curing of the plastic in the plastic material, the so-called matrix are embedded. Providing the carbon fiber layers with the plastics can be done individually of each laying on the respective situation, each individually after placing the respective carbon fiber layer or multiple carbon fiber layers together in one step after their superposition.

An advantage of the above embodiments, the immediate receipt of the infor-on over the fiber direction, without having to rely on a pattern recognition or the like. The measured polarization direction follows directly the fiber direction at the respective location of the object to be tested and the measurement can therefore be carried out quickly and reliably, and delays in particular the preparation in the case of FIG. 3 is not.

So above embodiments are based in other words that the carbon fibers have the characteristic incident, generally non-polarized light to partially reflect and to polarize parallel to the longitudinal fiber direction. This property of the polarizing behavior is used in the above embodiments, to determine the fiber-direction. For this purpose, a pictorial measuring the polarization is used. By means of a device which is suited to such a pictorial measurement that of the carbon fibers, such as a carbon fiber woven fabric, reflected light with respect to the direction of the polarization direction is analyzed. The result is then directly the direction of the carbon fibers at the appropriate place. The device may be suitable for pictorial, two-dimensional detection and analysis of polarized light, as described with respect to FIG. 2, the polarization sensitive camera and a "polarization camera "shows. According to some embodiments So the Prue-Fende object of carbon fibers is illuminated by a suitable light source, a polarization camera is directed at the object. The measured at each location of the object from the camera direction of polarization of the reflected light is directly the direction of the carbon fiber at this location at. The wavelength of the light may for example be in the range of 400 to 1000 nm. As has already been pointed out above, it is advantageously not necessary for the resolution of the camera is so high that the fibers in detail must be recognized in order to calculate the direction of the fibers via software. On the contrary, the fibers themselves polarize the light in fiber longitudinal direction and the camera only needs to be able to analyze the polarization spatially resolved. This means that in the case of FIG. 2, the pixel resolution of the camera can be significantly lower than in the case mentioned in the introductory part of this application process in accordance with c). This results due to the lower data rate and low computational complexity to lower system costs. Or, viewed differently, a larger area can be at the same cost in the case of the above embodiments in the same time be checked to carbon fibers, which leads to a higher number in the routine test and thus to lower unit costs. Another aspect is the fact that the recognition of the direction of the fibers takes place due to the laws of physics and not by calculation by means of software, whereby the detection of the direction of the fibers is much safer. This is especially true when soaked with plastic fabric, in which the previous method c) of the introductory works relatively poor and inaccurate.

In general, the above embodiments in the most diverse art showing off-chen are usable. One option would be a use in lightweight construction, where carbon fibers to so-called CFRP (carbon fiber reinforced plastics) are processed and the Qua-quality products must be ensured. Examples are just the aerospace industry, the automotive industry, wind turbines etc.

Although some aspects relating to an apparatus have been described, it is understood that these aspects also represent a description of the relevant proceedings-proceedings, so that a block or a component of a device to be understood as a corresponding method step or as a feature of a method step is , Similarly, aspects that have been described in connection with or as a method step also represent a description of a corresponding block or detail or feature of a corresponding apparatus. Some or all of the process steps can a hardware appliance (or using a hardware apparatus) such as a microprocessor, a programmable computer or an electronic circuit can be executed. Some Ausführungsbeispie-len some or several of the most important process steps can be carried out by such an apparatus.

Without having noted above, it could be that, for example, the computer 26 in Fig. 1 or any other processing device from the resulting polarization direction which indicates the direction of polarization in two dimensions in a projection along the direction along which the light reflected towards the polarization sensor 24 applies, ie for example in the plane parallel to the image plane of the camera, a three-dimensional fiber orientation or fiber direction in a Flächenparametrisie-tion of the surface 14 of the object 10 is determined by the detected polarization Rich-tung a place in a parameterization of the surface 14 of the object 10 and assigns the fiber direction is determined so that it lies in this point, tangentially to the surface 14 and in the plane which is spanned by the direction of the reflected light and the specific polarization direction. Of course, could be ensured even that the surface 14 - for example, at least at the current sampled site - is oriented in We-sentlichen perpendicular to the direction of the reflected light.

The above embodiments have focused so far on the measurement of fiber orientation and the use of knowledge gained thereby for purposes of handling orientation of the object relative to other objects. However, it is additionally or alternatively possible to use the knowledge of other purposes, such as for purposes of quality control. The polarizing effect of the carbon fibers to reflected light can be used to check the direction of the carbon fibers during the manufacturing of carbon-fiber-reinforced components and to compare with predetermined values. Not only intermediate products, such as the individual carbon fiber layers, but also to ferti-gen components can be carried out this test. It can be in particular checked whether the angle of the carbon fibers in the component or object have a specified value at any point of the component, or whether the mutual alignment of the fibers in a fabric having at each location a prescribed angle value.

Thus, in FIG. 1 for example, function of computer 26 as analysis means, such as by selecting the appropriate software running on it, and the device 20 could be a quality measuring device. The analyzer might consider whether the detected fiber direction met in a predetermined condition in order, if so, as to classify the object 10 of sufficient quality and, if not, to be classified as the object 10 of insufficient quality. Depending on the analyzing means may cause a manipulator for transporting the object 10 to a location A for reject objects or to a location B such as a mounting location.

The verification whether the predetermined condition is satisfied, for example, provides a comparison of the fiber direction at a position of the surface 14 of the object to an adjacent position before, such as checking whether the angle between two directions is within a predetermined angular range. The evaluation can also statistically suc gene: a histogram of fiber directions of sampled positions of the surface of the object is created and statistically verified. For example, two modes are determined and checked whether the angular distance between the two modes is in a predetermined range.

Checking whether the predetermined condition is satisfied, but may also, additionally or alternatively involve a characteristic surface direction of the object 10, such as an edge, a main curvature or circumference of the surface 14. It could then be checked whether the fiber direction relative to the characteristic surface direction is in a predetermined angular range. The characteristic surface direction could be detected automatically by the analyzer via pattern recognition. The automatic detection could be carried out in particular by means of a polarization-independent recording of the object 10th In case of using a camera as part of the polarization sensor 24, this is easily possible.

Finally, it is to the above embodiments, pointed out that it could also be that the light source is not part of the device or system is, but is optionally part of the environment. In other words, the ambient light itself could be used. Could we described above, the evaluation of the polarizing effect but on a range of wavelengths, such as are in the preferred wavelength range indicated above, bounded by the reflected light from the object divided not only in the polarization sensor with respect to its polarization, but is also spectrally filtered. The passband of the spectral filter could be so in particular in the range between 400 and 1000 nm and have a half-width of less than or equal lOOnm.

Depending on certain implementation requirements, embodiments of the invention may be implemented in hardware or in software. This is especially true for the above-mentioned processing device, controllers, analyzers, etc.

Implementation can be performed using a digital storage medium such as a floppy disk, a DVD, a Blu-ray disc, a CD, a ROM, a PROM, an EPROM, an EEPROM or a flash memory, a hard disk or other magnetic or are performed the optical memory, are stored on the electro-nic readable control signals, which can cooperate in such a manner with a programmable computer system, or cooperating that the respective method is performed. Therefore may be computer readable storage medium the digital.

Some embodiments according to the invention therefore comprise a data carrier having electronically readable control signals, which are capable of cooperating with a programmable computer system in such a way that one of the methods described herein is performed.

Generally, embodiments of the present invention may be implemented as Computerpro-program product with a program code, the program code being operative to carry out one of the methods when the computer program product runs on a computer.

The program code may for example be vomit-chert on a machine readable carrier.

Other embodiments comprise the computer program for performing one of the methods described herein, wherein the computer program is stored on a machine readable carrier.

In other words, an embodiment of the method according to the invention is therefore a computer program having a program code for performing one of the methods described herein, when the computer program runs on a computer.

Another embodiment of the process of the invention thus relates to a data carrier (or a digital storage medium or a computer readable medium), is recorded on the process described, the computer program for performing one of the herein.

Another embodiment of the method according to the invention is thus a data stream or a sequence of signals which respectively represents, or to the process described, the computer program for performing one of the herein. The data stream or the sequence of signals may for example, or can be configured to provide a data communication connection, for example via the Internet, to be transferred.

A further embodiment comprises a processing device, such as a computer or a programmable logic device that is configured to the effect or adapted to perform one of the methods described herein.

A further embodiment comprises a computer on which the program is installed to Computerpro-a transit through one of the methods described herein.

Another embodiment according to the invention comprises an apparatus or a system or vehicle is adapted to transmit a computer program for performing at least one of the methods described herein to a receiver. The transfer can take place, for example, electronically or optically. The receiver can be for example a computer, a mobile device, a storage device or a similar device. The apparatus or system may comprise, for example a file server for transmitting the Compute ROGRAMME to the receiver.

In some exemplary embodiments, a programmable logic device (for example, a field programmable gate array, an FPGA) can be used to perform some or all functionalities of the described herein. In some embodiments, a field programmable gate array may cooperate with a microprocessor to a method described herein durchzu-lead. In general, the processes are carried out in some exemplary embodiments by any hardware device. This may be a general-purpose hardware such as a computer processor (CPU), or specific for the process of hardware, such as an ASIC.

The embodiments described above are merely an illustration of the principles of the present invention. It is understood that modifications and variations of the arrangements and the details described herein will be apparent to others skilled. Therefore, it is intended that the invention be limited only by the scope of the following claims and not by the specific details that were presented herein with reference to the description and explanation of the exemplary embodiments of the

Claims

Apparatus for measuring a direction of the fibers (36A, B) of a carbon fiber material (18) of an object to be tested (10), with

a polarization sensor (24) for detecting a polarization direction (34A, B) of a reflected light from the object to be tested (10) (32), wherein the polarization direction indicates the direction of the fibers.

The apparatus of claim 1, further comprising a light source (22) for illuminating the object to be tested (10).

Apparatus according to claim 2, wherein the light source is configured to illuminate the object to be tested 10 with light 30 which is in a range between 400 and 1000 nm.

Device according to one of claims 1 to 3, wherein the polarization sensor (24) a polarization sensitive camera for receiving the object to be tested (10) to obtain a spatially resolved detection of the polarization direction and thus a spatially resolved scanning the fiber direction,.

Apparatus according to claim 4, wherein the polarization sensitive camera has a pixel array (38) and a lens (40) for imaging the object to be checked (10) onto the pixel array (38), said pixels (44) of the pixel Arrays (38) in Super-pixel (46) are grouped so that each super pixel (46) pixels (44) of the pixel arrays (38), which are sensitive for different polarization directions.

Apparatus according to claim 5, wherein each pixel of the photosensitive area, and the photosensitive region upstream polarization filter structure, said filter structure comprises a grid or structure elements having dimensions in the sub-wavelength a.

Device according to one of claims 4 to 6, wherein the device is formed, the spatially resolved scanning direction of the fiber output color-coded.

Device according to one of claims 1 to 7, further comprising a spectral filter for spectrally filtering the light reflected from the object, the direction of polarization of the polarization sensor (24) is detected.

9. The device according to claim 8, wherein a pass band of the spectral filter lies in a range between 400 and 1000 nm.

10. The device according to one of the preceding claims, wherein the apparatus comprises a controller which is adapted to a function of location information on a location of the object (10) relative to the polarization sensor (24) and the fiber direction of the object a manipulator for holding and changing the position of the object to be controlled.

11. The device according to one of the preceding claims, wherein the apparatus comprises a controller (26) which is adapted to a function of location information on a location of the object (10) relative to the polarization sensor (24) and the fiber direction of the object a manipulator to control juxtaposition of object and another object, so that the juxtaposed state,

Fiber direction relative to the other having a predetermined orientation.

12. The device according to one of the preceding claims, wherein the apparatus comprises a controller (26) which depends on location information about a location of the object (10) relative to the polarization sensor (24) and the fiber direction of the

Object orientation of the fiber direction relative to a shape of the object (10) is determined.

13. The device according to one of the preceding claims, wherein the device comprises processing means which is adapted to the detected from the

Polarization direction to determine a three-dimensional direction of the fibers or a fiber direction in a Flächenparametrisierung a surface (14) of the object (10) so that the specific fiber direction is tangent to the surface (14) and in a plane that is detected by a direction of the reflected light and polarization direction is spanned

14. The device according to one of the preceding claims, wherein the apparatus comprises an analysis means (26) which is designed to check whether the fiber direction satisfies a predetermined condition, for evaluating a quality of the object.

15. System for the manufacture of an object in carbon fiber composite structure, with

a device (20) for measuring a fiber direction of a carbon fiber ply (56) according to one of the preceding claims 1 to 14; and

a manipulator (54) for stacking the carbon fiber layers to the fiber alignment directions of the carbon fiber layers according to the measurement by the device (20).

16. System according to claim 15, further comprising means (60) for providing the carbon fiber layers with plastic, so that the carbon fiber layers are embedded after curing of the plastic in the plastic.

17. A method for measuring a direction of the fibers (36A, B) of a carbon fiber material (18) of an object to be tested (10), with

Illuminating the object to be tested (10); and

Detecting a polarization direction (34 a, B) of a reflected light from the object to be tested (10) (32), wherein the polarization direction indicates the direction of the fibers.

18. Computer program having a program code for performing the method of claim 17 when the program runs on a computer