CH706948A2 - Device for optoelectronic analyzing and receiving of measuring material e.g. textile material such as yarn, has image processing unit providing light image data to separately analyze light image data in accordance to spectral region - Google Patents

Abstract

The device has a light source unit radiating a light from a predefined, non-identical spectral region in a measuring region as cyclic sequence of light pulse. A light sensing unit (31) detects the light emitted from the measuring region, and is formed as a single-image sensor unit, so that detected light image data (60) of an image processing unit (50) is provided. The image processing unit provides the light image data to separately analyze the light image data (65) in accordance to a spectral region. The spectral region is attached to light origin points (23, 25). An independent claim is also included for an optoelectronic analyzing method for a measured material.

Description

TECHNICAL FIELD

[0001] The present invention relates to a device and a method for the optoelectronic analysis of measuring materials, in particular of textile materials, according to the scope of the independent patent claims. The invention can be used, for example, in the field of textile material testing.

STATE OF THE ART

[0002] Optical measuring devices are used, among other things, for the detection of properties of a moving textile material. In the basic principle, the test specimen is illuminated by a light source, and a part of the light which has interacted with the test specimen is detected by means of a light detector. By means of an output signal of the light detector, properties such as diameter, hairiness or foreign material contamination of the test sample can be determined.

[0003] DE-19 818 069 A1, for example, discloses a device for the determination of visually apparent characteristics of yarns consisting of individual fibers. The yarn is detected by means of a detection system by means of an optical image, and the image information formed therefrom is then further processed. The optical detection system comprises a lamp and one or more cameras associated with this lamp. A further lamp with a further camera can also be provided. The respective lamp illuminates the yarn with backlight (also called transmitted light) or incident light to the respectively assigned camera, which records image information. Transmitted light measurements work with the shadow throw of the yarn, reflected light measurements with its light reflection. The image information is preferably digitally processed and divided into information representing the yarn body itself and those which represent the fibers protruding from the yarn body. As a result, the thickness as well as possible thickness fluctuations have only minimal influence in determining the hairiness of the yarn. By means of the method, thicknesses, thin spots and the CV value can be detected, and at the same time the hairiness of the yarn can also be determined over the number and length of the projecting fibers.

[0004] Further optically imaging devices and methods for determining the hairiness of yarns are known, for example, from the documents EP-1 621 872 A2, WO-2011/153 648 A1 and WO-2011/153 650 A1.

[0005] It has long been known to improve the optical detection of foreign substances in a textile test product by the simultaneous use of several different light wavelengths. For this purpose, either a broad-band light source can be used together with a plurality of wavelength-selective light detectors or a plurality of sequentially illuminating light sources together with a broad-band light detector. The impurity information is contained in one of the light signals or in a combination of the light signals. Examples of such methods and devices are WO-1995/029396 A1, WO-2004/044 579 A1 and WO-2006/089 438 A1.

[0006] WO 2011/026 249 A1 describes a device for scanning a moving yarn. At least two light sources, which are arranged at different locations and which emit light with different spectral properties, respectively illuminate a lighting area of ​​the yarn path. A light detector detects light from the various illumination areas. By means of a field diaphragm, only that region of the illuminated measuring field is selected for detection, which is illuminated by all light sources. As a result, the entire field of view of the detector is illuminated with all the light components involved.

SUMMARY OF THE INVENTION

SUMMARY OF THE INVENTION It is an object of the present invention to provide an improved device and method for destructive, non-contact and marking-free optical scanning of a stationary or moving textile material which comprises the analysis and / or monitoring of at least one quality-relevant property Such as hairiness, impurity pollution or spatial expansion. Advantageously, several properties are to be de fi ned. The efficiency of the data collection, the evaluation possibilities and / or the measurement sequence should be optimized. The device should be inexpensive to produce.

[0008] These and other objects are achieved by the device according to the invention and by the method according to the invention, as defined in the independent patent claims. Advantageous embodiments are specified in the dependent patent claims.

The invention is based on the idea of ​​simultaneously using different light wavelengths for scanning the material to be measured and, in the analysis, separating the images recorded with the different wavelengths from each other. For this purpose, the material to be measured is illuminated with light from non-identical spectral regions, which is detected with a single image sensor unit in a location-resolving manner as well as in a spectrally resolving manner, and during the analysis the detected light image data are separated according to the spectral regions. Thus, a single, commercially available light detector can be used, and nevertheless a large amount of non-redundant information is available for the analysis of the measured material.

[0010] In a first alternative, the light components with different spectral regions come simultaneously from a plurality of different light origins or solid angles. In this case, various information about site-related aspects is obtained. For example, a transmitted light measurement can be carried out with red light and an incident light measurement can be carried out simultaneously with green light without the need for two separate light detectors.

[0011] In a second alternative, the light components with different spectral regions essentially come from the same light source location, but are offset with respect to one another in time. In this case, information about time-related aspects of the measured material is obtained. For example, two images with red or green light can be recorded one after the other; From the displacement of the material to be measured and the time interval between the images, the speed of the material to be measured can be determined. The displacement is determined on the basis of spatially significant features of the material to be measured.

[0012] The two aforementioned alternatives can be combined with one another. Thus, in the case of a combination, the light components with different spectral regions come from a plurality of different light sources and are offset with respect to one another in time.

[0013] The device according to the invention is used for the optoelectronic analysis of measured material, in particular of textile materials, such as yarn. It comprises a predefined measuring range suitable for receiving the measured material. A light source unit of the device is designed to radiate light from at least two predefined, non-identical spectral regions into the measuring range. In addition, the device comprises light sensor means which are suitable for detecting light emerging from the measuring range. The light sensor means are designed as a single image sensor unit which is adapted to detect the light emerging from the measuring area in a location-resolving manner as well as spectrally resolvingly and to provide thus detected light image data to an image processing unit.

The device and the method can thus be used for analyzing yarn properties such as hairiness, diameter and / or rotation using a single light sensor. The present invention makes it possible to combine the functionality of several sensor modules, each comprising a light sensor and measuring textile properties, in a single module by operating different lighting units or light sources simultaneously with a single image sensor. The individual illuminations operate at different light wavelengths, ie light colors, and superimpose themselves on the image sensor (the light sensor means), which is also sensitive to the corresponding light wavelengths of the light sources. The image sensor is thus a color sensor, Which is able to distinguish the different light wavelengths from each other. In a subsequent data processing step (image processing), the images of the individual lighting units are separated from one another again. This is ideally done by converting the image data in a suitable color space, such as RGB, LAB, or in other color schemes.

[0015] The material to be measured is guided along a predefined guide path. For this purpose, a measuring good brake (for example, a yarn brake) and a conveying device are provided, for example, as known from the prior art, a measuring material supply region, a measured material discharge (for example with draw-off rollers). It is essential that the material to be measured be guided or placed in the measuring range. Advantageously, the measured material is continuously conveyed through the measuring range during the measuring process. This can also take place at comparatively high speeds, that is to say for example at 100 meters / minute to 1000 meters / minute, in particular at 800 meters / minute. In principle, however, it is also possible that the measurement is carried out on the stationary sample.

In this case, the material to be measured is preferably of an elongated, in particular a thread-like or band-shaped shape. Specifically, yarn, for example a spun yarn yarn or twisting yarn, or a textile belt or piece, can be used as measured material. The measured material which is conveyed into the measuring range according to the prior art and / or is held at least for a short time is irradiated by the light source unit with light. This structure is, so to speak, similar to a light barrier, which is arranged substantially perpendicular to the longitudinal axis of the textile, that is to say, for example, to the yarn longitudinal direction in the measuring region.

Depending on the relative arrangement of the material to be measured and the image sensor unit with respect to locations of light, ie, to locations from which the light is sent into the measuring range, the light falls, for example, as incident light onto the material to be measured and is, in particular, reflected or scattered into the image sensor unit. However, the light can also fall as a backlight or transmitted light onto the material to be measured, ie, radiate directly onto the image sensor, whereby the material to be measured is in the beam path and the light strikes the image sensor unit. As an example, light sources provided at different sources can be arranged with respect to the material to be measured and the light detector such that the light detector detects light transmitted by the textile material or reflected by the textile material.

In order, in particular, to maximize the light output and the detection signal, and thus to optimize the efficiency, the device can provide an illumination optics, which at least partly illuminate the light into the measuring range, and at least one light capturing the light out of the measuring range and at least partially leading to the image sensor unit Imaging optics.

[0019] As afore-mentioned optical elements, all optical means suitable for imaging and / or manipulating the beam path of the corresponding light can be used in principle. It is to be noted here that such an optics is basically optional and, in the simplest case, consists, for example, of a diaphragm and / or of an optical lens or an arrangement of a plurality of such elements and is directed to the corresponding light source (s) Must be tuned.

Light transmission elements can be provided for guiding the light to the light sources from where the light falls on the material to be measured or for guiding the light from the measuring range to the image sensor means or the detector. These light-transmitting or light-conducting means can be, for example, plastic optical fibers or other means known to the person skilled in the art.

It is thus conceivable for the illumination optics to emit the light from different light sources in reflected light and / or as transmitted light into the measuring range by means of a light-conducting means, with exactly one spectral range being assigned to each light-origin location. The light can be directed from one light source in each case by means of light-conducting means to one or more different locations, these locations being the light-emitting sites from which the light falls onto the material to be measured. A light source can thus be provided for each light source location at another location. For this purpose, above-mentioned or implicitly mentioned light guiding or light transmission elements can be provided. However, it is also conceivable that the light can be transmitted from a single light source to a plurality of locations which become locations of light origin, . For this purpose, in particular additional or exclusively half-mirrors can be provided as beam splitters or other elements splitting or dividing the light path, and means known to one skilled in the art, for example prisms or double-breaking crystals. In order to allow light from predefined and non-identical spectral regions of different locations of light to fall into the measuring range, it can be particularly advantageous to provide a light filter system or light selection means in such a way that light is emitted at the end of different beam paths to different light source locations, ie at spatially different locations Different, preferably non-overlapping, spectral regions. In the simplest case, a passive and wavelength-selective light filter is used as light selection means in one of the different beam paths, which filter system selectively filters a spectral range from the incident light. A double-breaking crystal or a prism, that is to say a basically polychromatic light wavelength-dependent refractive element, can replace such a filter system.

The light source unit advantageously provides at least one of the light source locations such that the light emitted therefrom is provided as transmitted light (ie, in a backlight arrangement) and at least one other light source location is provided in such a way that the light emanating therefrom is provided as incident light is.

In addition or alternatively, the light source unit can comprise two, three, four or more individual light sources, each located at different light sources, which respectively emit the light from the different light source locations as reflected light and / or as transmitted light into the measuring range. These light sources can also be close to the light source locations, and their light can be guided to the light source locations by means of the above-mentioned light transmission elements.

The device according to the invention can, therefore, be arranged to separate the light from at least two of the different locations of light by means of light selection means (or light filter systems) and / or differently emitting light sources (ie spectrally differently radiating light sources) Over-intersecting or overlapping spectral regions.

It is conceivable that the light source unit of the device for optoelectronic analysis and / or monitoring is adapted to provide the light from different spectral regions in each case continuously or individually or as a function of the light emission from other light sources. A continuous illumination can be advantageous if a material to be measured is to be measured or checked over the entire length. If, on the other hand, only random sample-like measurements are necessary, the illumination can be pulsed, for example by means of a gradual or regular operation, for example in a stroboscope-like manner. The material to be measured can thus be stroboscopically or flash-like, advantageously diffusely illuminated, which may be expedient, If a momentary image of the measuring material located in the measuring area is desired, for example at high running speeds of the material to be measured through the measuring range. In this way, a strong evaluation of the measurement results can at least be partly prevented. It can be provided in this case that the detector detects in a location-resolving manner over the relevant length of the measuring range. It is conceivable that the respective measured material sections, which are illuminated in each case by a light cone which can be a light cone, overlap each other without gaps, or of individual and well-separated sections which have individual or several sections of measuring material arranged side by side. In this way, a strong evaluation of the measurement results can at least be partly prevented. It can be provided in this case that the detector detects in a location-resolving manner over the relevant length of the measuring range. It is conceivable that the respective measured material sections, which are illuminated in each case by a light cone which can be a light cone, overlap each other without gaps, or of individual and well-separated sections which have individual or several sections of measuring material arranged side by side. In this way, a strong evaluation of the measurement results can at least be partly prevented. It can be provided in this case that the detector detects in a location-resolving manner over the relevant length of the measuring range. It is conceivable that the respective measured material sections, which are illuminated in each case by a light cone which can be a light cone, overlap each other without gaps, or of individual and well-separated sections which have individual or several sections of measuring material arranged side by side.

In a preferred embodiment, the light source unit is designed to radiate light into at least two different temporal light emitting intervals into the measuring range, wherein exactly one spectral range is assigned to each light emitting interval. The light can, for example, be provided in such a way that the at least two light emitting intervals do not overlap. The light is preferably provided as a cyclic sequence of light pulses.

It is advantageous if each of the light sources emits light whose wavelength spectrum is essentially a cohesive, limited spectral range, the spectral ranges of the different light sources advantageously not overlapping substantially. However, it is also conceivable that only non-identical but partially overlapping spectral regions are used, in which case the light part data then separately provided in the image processing unit corresponding to the non-overlapping spectral regions, so that the data can be ensured due to light from different light sources Are clearly identifiable. In this case, the light from different light source locations could also be differently modulated in the intensity, In order subsequently to improve the assignment of the measurement signal to a light source location. The term light, unless explicitly stated otherwise, comprises electromagnetic radiation of any kind, in particular those from the visible and adjacent spectral regions, ie, ultraviolet and infrared.

An advantage of the infrared radiation is, for example, independence of the measured data from the measured material coloring, ie color differences in the measured material are filtered out. The light can fall as a backlight or transmitted light or reflected light onto the material to be measured and then, for example, as scattered light onto the sensor means.

In principle, it is conceivable for the light source unit to separate the light from the predefined and non-identical spectral regions, in each case with wavelengths, preferably from the range of approximately 100 nanometers to approximately 10,000 nanometers, in particular from the visible range of approximately 350 nanometers to approximately 650 nanometer, with essentially monochromatic light being particularly preferred.

Light emitting diodes (LEDs), for example, can be used as light sources. Thus, for example, a light emitting diode emitting a red light and emitting a green light may be present. The light sources can be accommodated in a common housing, which is preferably fully encapsulated and transparent to the light emitted. The housing can simultaneously act as a collimator lens for the light emitted. Advantageously, care is taken that no light which does not originate from the measuring range passes to the light detector. For example, care must be taken that no direct, ie, non-reflected or scattered light from a light source, which is intended to provide incident light, reaches the light sensor means.

The image sensor unit, which in this document is also referred to as a sensor means, a detector, a light detector or as an image sensor or similar, is preferably provided by a two-dimensional, optoelectronic image sensor with a multiplicity of imaging elements arranged in matrix form, which preferably comprises a CMOS or CCD -Sensor. Two-dimensional is to be understood in this case in such a way that the image sensor surface resolves, that is to say detects in a location-resolving manner, and provides the light image in light image data, which preferably comprise the light intensity detected at certain locations as a function of the wavelength of the lightwave. A high-speed camera can also serve as a matrix sensor (ie as a light detector). In principle, a linear or two-dimensional arrangement of a plurality of light-sensitive elements and the material to be measured can serve as an image sensor or light detector. The conversion of the captured light into frequency-resolved light data can be done as is known in the art. In this case, the light detector is sensitive to light and color, ie, spectrally resolving, the light is thus detected in a wavelength-dependent manner. In addition, the detector is adapted to the spectral regions; Corresponding image sensor means for the visible spectral range are, for example, known from semiconductor technology. In this case, the light detector is sensitive to light and color, ie, spectrally resolving, the light is thus detected in a wavelength-dependent manner. In addition, the detector is adapted to the spectral regions; Corresponding image sensor means for the visible spectral range are, for example, known from semiconductor technology. In this case, the light detector is sensitive to light and color, ie, spectrally resolving, the light is thus detected in a wavelength-dependent manner. In addition, the detector is adapted to the spectral regions; Corresponding image sensor means for the visible spectral range are, for example, known from semiconductor technology.

[0032] The detector unit is a significant cost factor. Thus, their multiple use, ie, their use for detecting light from a plurality of light sources or from different spectral regions and / or from different spatial directions or from different light sources, is advantageous. Thus, the present invention solves a further object, namely to provide a more cost-effective method for optical analysis and / or monitoring of stationary or moving textile material. In addition, the present invention is advantageous because less space is consumed by a single image sensor than by a plurality of image sensor units and thus a space saving is achieved.

The device according to the invention can also make further components and / or devices from a group comprising a conveyor device, a control device, an evaluation device, a user interface, preferably a data input device and / or an output device, a computer and a computer network, As well as other elements which appear to be useful or necessary to the person skilled in the art.

[0034] The present invention also includes a method for optoelectronic analysis and / or monitoring of measured material. The material to be measured is irradiated by light, which is composed of at least two light components which have predefined, non-identical spectral regions. At least a part of the light is detected by a single image sensor unit in a location-resolving manner as well as spectrally resolvingly. Thus, light image data are analyzed separately according to the spectral ranges.

The light image data or signal components are then evaluated, preferably linked together, in order to obtain information on parameters of the material to be measured, such as hairiness. The evaluation can take place analogously and / or digitally. Suitable methods and units for evaluating detector signals when using differently colored light sources are known per se from the prior art and need not be explained in detail here.

[0036] The at least two light components can originate from different light sources. Preferably, a first light component emits the measured material as transmitted light and a second light component as reflected light.

In this case, the light from non-identical spectral regions can each fall continuously or pulsed into the measuring region, and the pulsed light from the one spectral region can be provided simultaneously or time-delayed with the pulsed light from at least one other spectral region.

[0038] The at least two light components can be irradiated at different temporal light emitting intervals, which preferably do not overlap. In a preferred embodiment, the at least two light components are radiated as a cyclic sequence of light pulses.

Advantageously, in this method, the light image data separated by the spectral regions or by the locations of the light origin are linked with one another. For example, the diameter of yarn can be determined in a transmitted light measurement and the hairiness can be measured in a simultaneous transmitted light measurement with light from another spectral range, whereby the measurement data regarding the diameter are taken into account for the evaluation of the hairiness.

The method according to the invention and the device according to the invention can preferably be used for the analysis of measured material, in particular for determining a property from the group comprising a hairiness, a diameter, a throughput speed, a rotation, a contaminant contamination of a measuring device which is stationary in the measuring range or moved by the measuring range Measuring material, in particular of a yarn, can be used. It is advantageous to measure several properties at the same time, which then allows them to be interlinked.

BRIEF DESCRIPTION OF THE DRAWINGS FIG

Preferred embodiments of the invention are described in the following with reference to the drawings, which are given for illustrative purposes only and are not to be construed as limiting.

FIG. 1 shows a schematic, perspective view of a device with the device according to the invention.

FIG. 2 shows a block circuit diagram of the device according to FIG. 1.

FIG. 3 shows a schematic representation of the measuring range of the device according to the invention according to FIG. 1.

FIG. 4 shows a schematic representation of the measuring range of a further embodiment of the device according to the invention.

FIG. 5 shows two images simultaneously recorded in different spectral regions, namely (a) in transmitted light and (b) in incident light.

FIG. 6 shows two images recorded in different spectral regions at different times. DESCRIPTION OF PREFERRED EMBODIMENTS

[0042] For the analysis and / or monitoring of properties of textile materials, such as yarns, images of the measuring material located in a measuring area are produced by means of an optoelectronic device. In the following, embodiments which measure yarn are described. Instead of this yarn, it is also possible, in general, to measure another material to be measured with the modifications of the device or the method known to a person skilled in the art.

[0043] FIG. 1 shows a perspective view of a device 1 for the analysis of textile material 9. A yarn can be seen in FIG. 1 as the measured material 9. Furthermore, a housing 11 with different yarn guide elements 12.1-12.5 for guiding the yarn 9, with a sensor cover 16 for an optoelectronic yarn sensor device 3 and with a roller cover 17 for a yarn conveying device 4 can be seen. The optoelectronic yarn sensor device 3 measures at least one, preferably several, parameters of the yarn. For example, the length of fibers (flare) which protrude from the yarn 9 or the yarn diameter. The optoelectronic yarn sensor device 3 can now be designed as an apparatus 3 according to the invention for optoelectronic analysis of measured material 9. Thus the device 3 is set into one of the possible contexts.

As the block diagram in FIG. 2 schematically shows, the device 1 can have a star-shaped construction in functional terms. Its morter piece is then a central control device 2, which is connected to a plurality of other components and / or devices 53, 54, 55, controls the latter and evaluates signals from the optoelectronic yarn sensor device 3. The tasks of the control and signal evaluation are carried out by a processor 201, preferably a digital signal processor (DSP). The processor 201 is connected to the optoelectronic yarn sensor device 3, which determines at least one feature of the yarn 9 such as, for example, its hairiness. The processor 201 is connected to a conveyor 4 which moves the yarn 9 along its longitudinal direction through the optoelectronic yarn sensor device, Which is indicated by an arrow 90. A program stored in the processor 201 controls its switching on and off, the intensity (for example, switching on and off) of the illumination, the retrieving and evaluation of the recorded images, the yarn conveying speed and / or further parameters. In this way it controls the flow of the

Determination of the characteristics of the yarn 9 in the device 1. The control device 2 can also communicate with a user interface 53, which can contain an input device 51 and an output device 52. Furthermore, the control device 2 can be connected to a computer 54 and / or a computer network 55 and can exchange data with it. Data can be exchanged using known standards such as Ethernet or USB. The optoelectronic yarn sensor device 3 includes a lighting unit or light source unit and an imaging unit. The illumination unit has at least one light source 22 and one illumination optical system 28. For example, a light-emitting diode (LED) can be used as light source 22. The light source 22 emits electromagnetic radiation in the visible, infrared and / or ultraviolet spectral range, Which is summarized in this book for the sake of simplicity under the term «light». The illumination system 28 collimates the light emitted by the light source 22 into an illumination region on the yarn 9. The imaging unit has an imaging optics 29 and an optoelectronic image sensor 31. The image sensor 31 is preferably a two-dimensional image sensor 31 with a multiplicity of matrix-shaped image elements (pixels) arranged in rows and columns. Such image sensors 31 are commercially available in the form of integrated optoelectronic components in various technologies, for example from digital cameras, and are widely used. Alternatively, as an image sensor 31, a likewise known one-dimensional line sensor having a plurality of pixels, Which are arranged on a straight line perpendicular to the yarn longitudinal direction. The imaging optical system 29 forms a yarn section on the image sensor 31.

[0045] The image sensor 31 can be integrated in the control device 2. This means that the image sensor 31 and the processor 201 are applied to one and the same circuit board 202. The evaluation of the signals of the image sensor 31 on the same printed circuit board 202 is thus performed on the same as the recording of the images of the yarn 9.

A first particularly preferred embodiment of the device 3 according to the invention is shown schematically in a plan view in FIG. The measured material 9, for example a yarn, passes through a measuring area 10 along a predefined path. In FIG. 3, this path is substantially perpendicular to the character sheet. The material to be measured 9 can have a circular, an oval, or any other cross-section.

The moving sample 9 is irradiated by a first light source 22, which is positioned essentially at a first light source location. In FIG. 3, light beam 26 is schematically represented by dashed lines. This light beam 26 can in general be optionally modified by a lighting optics-side illumination optics 28, and is thereby matched, in particular, to the measuring range 10, falls on the measured material 9, and irradiates a first illumination region 6 of the material to be measured 9. In this case, the first light source 22 can, for example, emit a red light Light-emitting diode. The light source 22 transmits, in reflected light or transmitted light, to the material to be measured 9, that is, it radiates essentially directly to an image sensor unit 31, (At least temporarily) a specimen shadowing characteristic of the specimen paramater, onto the image sensor unit 31, which then detects less light in a spatial resolution. It is therefore advantageous for the light beam 26 to pass through the measured material 9 at least temporarily and at least partially, so that the entire transmitted light is not constantly blocked.

A detector-side imaging optical system 29 directs the light from the measuring region 10 into a light beam 26 'and forms the measured material 9 onto the image sensor unit 31. There, the light is resolved by a wavelength-dependent, ie color-dependent, detection.

In the embodiment according to FIG. 3, the measured material 9 is also illuminated by a second light source, which is essentially located at a second light source location 25, which is different from the first light source location. The light emitted from the second light source location 25 can in this case also be optimized by means of an illumination optics 28 for the measurement purposes and then generates a second illumination region 7 which does not overlap with the first illumination region 6.

The light sources 22, 24 are preferably individually controllable by means of a light source control (not shown in FIGS. 3 and 4). Optionally, their intensity can be periodically modulated. The light sources 22, 24 and / or can be switched on and off one after the other, as is known from the prior art mentioned in particular. Light guides or light guide means may be provided between the light sources 22, 24.

The illumination regions 6, 7 can generally be entire longitudinal sections which extend over parts of one or over the complete width of the material 9 or even smaller regions of the material 9 to be measured.

The second light source 24 is placed with respect to the measuring material 9 and the image sensor unit 31 in such a way that the light incident in the light projection 27 is reflected into a light projection 27 ', which is then illuminated by the possible imaging system 29 in a light projection 27 " The image sensor unit 31 can be focused.For the focusing of each light projection 26 ', 27', a single imaging optics 29 can be provided in each case, if the circumstances so require, a combined imaging optics 29, for example space and cost-saving imaging optics 29. The second light source 24 radiates here (And not containing red), the detected light can then be transmitted to the light sources 22, 24 and thus to the light origin locations 23,25 can be assigned.

In a non-graphically illustrated embodiment, the illuminating regions 6 and 7 can also overlap or even be identical. If necessary, the light sources 23, 25 can also be offset in the vertical to the display plane, that is to say substantially along the measured object 9, or at the same level.

In further embodiments (not shown here) the light beam 27 can be irradiated in the cross-section more of the measured material 9 than in FIG. 3 or also irradiate the entire measured material 9 (referring to the cross-section) and possibly even more of the measuring area 10.

The light detected in the image sensor unit 31 is provided in the form of light image data 60, as known from the prior art, via transmission means or a data connection 51 to an image processing unit 50. These light image data 60 preferably comprise the light intensity intensity distribution of the light detected by the image sensor unit 31, which is dependent on the location and in particular the light wavelength. The image processing unit 50 is then configured to identify and separate light image data 65 from these light image data 60, the light image data 65 comprising those light image data 60 which are unambiguously assigned to a single one of the light source locations 23, 25 from which the data-producing light originates can. Thus, advantageously, there is one light source 23, 25, a light image data set 65, which can be evaluated in a subsequent analysis and / or as a function of one or more other light image data sets 65. The above-described assignment of the light image data to the respective light source location 23, 25 is central so that, for example, one knows whether the respective light has been emitted as incident light or transmitted light. Thus, independent optoelectronic measurements on the measured material 9 are possible with the same image sensor unit 31. This multiple use of the image sensor unit 31, that is to say the multi-colored illumination and use of the same image sensor, basically allows the efficiency of the detection device 3 to be analyzed and / or monitored in a cost-effective manner,

A further embodiment is shown in FIG. 4, which basically differs in the manner from the embodiment according to FIG. 3, in which the light reaches the light source locations 23, 25. According to FIG. 4, the light from a single light source 22 can be directed to the light sources 23, 25 via light guide means 28a. In this case, it is advantageous if the light source 22 emits polychromatic light. The light can then be manipulated via light selection means or light filter 21 on the way to the light origin locations 23, 25 in such a way that light is emitted from the different light sources 23, 25, which has different spectral compositions (colors). In this case, for example, only the light, which is directed to the second light source location 25, (As shown in FIG. 4) so ​​that the above-mentioned difference in light comes about. However, it is also conceivable that light selection means 21 are provided in all the light paths to the light sources. In the simplest case, the light selection means 21 can be a simple light filter (as known from the prior art), which filters out certain colors or spectral regions.

In principle, it is also conceivable to work with the polarization of light, ie to measure with polarized light or to filter and identify the light due to the polarization by means of polarization filters.

The light-conducting means 28a can be produced, for example, from a glass and / or plastic transparent to the light used. Your walls can be mirrored, or the guided light can be reflected on the walls by means of total reflection. Alternatively, the walls may be of a diffusing configuration, for example by roughening and / or coating.

It is possible and, under certain circumstances, even advantageous to provide instead a diffuse illumination of the material to be measured 9. The detected light can also be diffuse, which can be achieved, for example, by a scattering configuration of the walls of the light guide or by a diffusing screen in the beam path on the receiver side.

[0060] FIG. 5 shows two images, as can be taken simultaneously, for example, by the image sensor unit 31 of FIG. The image of FIG. 5 (a) was taken with the light emitted from the first light source 22, the image of FIG. 5 (b) with the light emitted from the second light source 24. As described above, both images are captured simultaneously by the same image sensor unit 31, but image processing by the image processing unit 50 is separated from each other due to their different spectral ranges. For the sake of clarity, the separated images are already shown in FIG.

5 (a) clearly shows the contours of the yarn 9 and of its protruding flare 91. On the basis of this image, for example, the yarn diameter, the yarn uniformity and / or the yarn hairiness can be determined ,

Although the contours of the yarn 9 can also be taken from the image of FIG. 5 (b) taken in the incident light, it is also possible to obtain a much lower contrast than in transmitted light. For this purpose, the reflected light image shows structures on the yarn surface, such as, for example, a shell particle 92, other foreign substances and yarn rotation, as well as op-tic properties of the yarn 9, such as the reflectivity in the relevant spectral range. Thus, different information about the yarn can be taken from the two images.

The two images shown in FIG. 6 were recorded with light from different spectral regions, which was radiated from at least approximately identical light sources. However, they were recorded at different times, which differ by a time interval Δt. The transmitted light or the incident light method can be used, the former being preferred because of the better recognizability of the yarn contours (see FIG. 5). As described above, both images are captured simultaneously by the same image sensor unit, but image processing is separated from one another due to their different spectral ranges. For the sake of clarity, the separated images are already shown in FIG. Due to at least one spatially marked feature 93, for example, A thickening position, the mutual spatial displacement As of the two images is determined during the image processing. The yarn speed v can be calculated in a simple manner from the time interval At and the spatial displacement As: [0064] v = As / At.

[0065] The present invention is not limited to the preferred embodiments or embodiments described above. Rather, a number of variants are conceivable, which makes use of the illustrated solution also in fundamentally different designs. Any features and / or advantages resulting from the claims, the description or the drawings, including constructive details, spatial arrangements and process steps, can be essential to the invention both in themselves and in various combinations.

LIST OF REFERENCE NUMBERS

1 Machine 2 Control device 201 Processor 202 Circuit board 3 Device for optoelectronic analysis of measured material 5 Measured material 6,7 Illumination range 9 Yarn 10 Measuring range 11 Housing 12.1-12.5 Guide elements for the yarn 16 Sensor cover 17 Roller cover 20 Light source unit 21 Light selection means 22.24 Light source 23.25 Light source 26.26 "Light throw 27, 27 ', 27" light throw 28 illumination optics 28a light guide means 28b light filter means 29 imaging optics 30 light sensor means

Claims (10)

31 Image sensor unit 32 Image elements 50 Image processing unit 51 Input device 52 Output device 53 User interface 54 Computer / computer 55 Computer network 51 Data connection 60 Light image data 65 Light image data 90 Yarn movement 91 Hair 92 Peel particles 93 Spatially distinctive feature Patent claims

1. A device for optoelectronic analysis of measured material, in particular of textile materials, such as yarn, comprising a predefined measuring range suitable for receiving the measured product, a light source unit adapted to transmit light Characterized in that the light - sensor means (31) are designed as light - sensing means (31) which are suitable for detecting light emitted from the measuring region (10) A single image sensor unit configured to detect the light emerging from the measuring area (10) in a spatially resolved manner as well as in a spectrally resolving manner and to provide thus detected light image data (60) to an image processing unit (50)And the image processing unit is adapted to provide the light image data for further analysis in light image data separated by the spectral regions.

2. The device as claimed in claim 1, wherein the light source unit is adapted to irradiate light and at least two different light source locations into the measuring range , 25) is assigned exactly one spectral range.

3. The device according to claim 2, wherein the light source unit provides at least one of the light source locations with respect to the measuring range in such a way that the light emanating therefrom is provided as transmitted light, and at least one other of the light source locations (25; 23) in such a way that the light emitted therefrom is provided as an incident light.

4. The device as claimed in claim 1, wherein the light source unit is configured to radiate light into at least two different light emitting intervals into the measuring region, wherein a respective spectral range is assigned to the light emission interval.

5. The device (3) according to claim 4, wherein the light source unit (20) is arranged to provide the light as a cyclic sequence of light pulses.

6. The device according to claim 1, wherein the light source unit provides the light such that the predefined and non-identical spectral regions do not overlap.

7. Use of the device according to claim 1 for determining a property from the group comprising a hairiness, a diameter, a throughput speed, an impurity confinement of a measuring substance which is stationary in the measuring range (10) or moved through the measuring range (10) (9), in particular of yarn.

8. Method for the optoelectronic analysis of measured material, wherein the measured material is irradiated by light which is composed of at least two light components which have predefined, non-identical spectral regions, and at least some of the light is detected , Characterized in that the at least one part of the light is detected by a single image sensor unit (31) in a location-resolving manner as well as in a spectrally resolving manner, and thus detected light image data (60) are analyzed separately according to the spectral regions.

9. The method as claimed in claim 8, wherein the at least two light components originate from different light sources (23, 25) and one spectral range is assigned to each light source location (23, 25).

10. The method according to claim 8, wherein the at least two light components are emitted to different light emitting intervals.