WO2016044874A1 - Method for monitoring an arc process carried out by a burner, and device for carrying out said method - Google Patents

Method for monitoring an arc process carried out by a burner, and device for carrying out said method

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Publication number
WO2016044874A1
WO2016044874A1 PCT/AT2015/050236 AT2015050236W WO2016044874A1 WO 2016044874 A1 WO2016044874 A1 WO 2016044874A1 AT 2015050236 W AT2015050236 W AT 2015050236W WO 2016044874 A1 WO2016044874 A1 WO 2016044874A1
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WO
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Application
Patent type
Prior art keywords
images
exposure
arc
process
different
Prior art date
Application number
PCT/AT2015/050236
Other languages
German (de)
French (fr)
Inventor
Daniel ANGERMAYR
Günther REINTHALER
Original Assignee
Fronius International Gmbh
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date

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Classifications

    • BPERFORMING OPERATIONS; TRANSPORTING
    • B23MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23KSOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
    • B23K9/00Arc welding or cutting
    • B23K9/095Monitoring or automatic control of welding parameters
    • B23K9/0956Monitoring or automatic control of welding parameters using sensing means, e.g. optical
    • GPHYSICS
    • G06COMPUTING; CALCULATING; COUNTING
    • G06TIMAGE DATA PROCESSING OR GENERATION, IN GENERAL
    • G06T5/00Image enhancement or restoration, e.g. from bit-mapped to bit-mapped creating a similar image
    • G06T5/007Dynamic range modification
    • G06T5/008Local, e.g. shadow enhancement
    • GPHYSICS
    • G06COMPUTING; CALCULATING; COUNTING
    • G06TIMAGE DATA PROCESSING OR GENERATION, IN GENERAL
    • G06T5/00Image enhancement or restoration, e.g. from bit-mapped to bit-mapped creating a similar image
    • G06T5/50Image enhancement or restoration, e.g. from bit-mapped to bit-mapped creating a similar image by the use of more than one image, e.g. averaging, subtraction
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04NPICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N5/00Details of television systems
    • H04N5/222Studio circuitry; Studio devices; Studio equipment ; Cameras comprising an electronic image sensor, e.g. digital cameras, video cameras, TV cameras, video cameras, camcorders, webcams, camera modules for embedding in other devices, e.g. mobile phones, computers or vehicles
    • H04N5/225Television cameras ; Cameras comprising an electronic image sensor, e.g. digital cameras, video cameras, video cameras, camcorders, webcams, camera modules for embedding in other devices, e.g. mobile phones, computers or vehicles
    • H04N5/232Devices for controlling television cameras, e.g. remote control; Control of cameras comprising an electronic image sensor, e.g. digital cameras, video cameras, TV cameras, video cameras, camcorders, webcams, camera modules for embedding in, e.g. mobile phones, computers or vehicles
    • H04N5/23229Devices for controlling television cameras, e.g. remote control; Control of cameras comprising an electronic image sensor, e.g. digital cameras, video cameras, TV cameras, video cameras, camcorders, webcams, camera modules for embedding in, e.g. mobile phones, computers or vehicles comprising further processing of the captured image without influencing the image pickup process
    • H04N5/23232Devices for controlling television cameras, e.g. remote control; Control of cameras comprising an electronic image sensor, e.g. digital cameras, video cameras, TV cameras, video cameras, camcorders, webcams, camera modules for embedding in, e.g. mobile phones, computers or vehicles comprising further processing of the captured image without influencing the image pickup process by using more than one image in order to influence resolution, frame rate or aspect ratio
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04NPICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N5/00Details of television systems
    • H04N5/222Studio circuitry; Studio devices; Studio equipment ; Cameras comprising an electronic image sensor, e.g. digital cameras, video cameras, TV cameras, video cameras, camcorders, webcams, camera modules for embedding in other devices, e.g. mobile phones, computers or vehicles
    • H04N5/225Television cameras ; Cameras comprising an electronic image sensor, e.g. digital cameras, video cameras, video cameras, camcorders, webcams, camera modules for embedding in other devices, e.g. mobile phones, computers or vehicles
    • H04N5/235Circuitry or methods for compensating for variation in the brightness of the object, e.g. based on electric image signals provided by an electronic image sensor
    • H04N5/2355Circuitry or methods for compensating for variation in the brightness of the object, e.g. based on electric image signals provided by an electronic image sensor by increasing the dynamic range of the final image compared to the dynamic range of the electronic image sensor, e.g. by adding correct exposed portions of short and long exposed images
    • GPHYSICS
    • G06COMPUTING; CALCULATING; COUNTING
    • G06TIMAGE DATA PROCESSING OR GENERATION, IN GENERAL
    • G06T2207/00Indexing scheme for image analysis or image enhancement
    • G06T2207/10Image acquisition modality
    • G06T2207/10141Special mode during image acquisition
    • G06T2207/10144Varying exposure
    • GPHYSICS
    • G06COMPUTING; CALCULATING; COUNTING
    • G06TIMAGE DATA PROCESSING OR GENERATION, IN GENERAL
    • G06T2207/00Indexing scheme for image analysis or image enhancement
    • G06T2207/20Special algorithmic details
    • G06T2207/20172Image enhancement details
    • G06T2207/20208High dynamic range [HDR] image processing

Abstract

The invention relates to a method and a device for monitoring an arc process carried out by a burner (1), in particular a welding process, wherein the burner (1) moves along a processing path (x), and images (Pi) of the surroundings of the arc (2) are captured with a refresh rate (fB), using a monitoring system (3) connected to the burner (1) and having at least one camera (4), and the images (Pi) are displayed on a display device (10), wherein, with the refresh rate (fB), at least two images (Pij) having a different exposure time (tBj) are captured after one another. In order to improve the quality of the captured images, despite the very bright arc (2), sections (P'ij) are cut out of each of the at least two images (tij) having a different exposure time (tBj), and combined with an assembled image (Ρ''i), and the assembled image (Ρ''i) is displayed.

Description

A method of monitoring an operation performed by a burner arc process and apparatus for carrying out Ver ¬ proceedings

The invention relates to a method for monitoring an operation performed by a burner arc process, particularly the welding process, the burner performs a movement along a processing path, and connected by means of the burner, at least one camera comprising Überwachungssys ¬ tems images of the surroundings of the arc with a refresh rate are recorded and the images on a

Display device are shown, successively, at least two images are captured with different exposure times with the refresh rate.

Furthermore, the invention relates to a device for carrying out above-mentioned method for monitoring a process performed with a movement along a machining path exporting burner arc process, in particular Schweißpro ¬ zesses, connected to a with the burner, at least one camera comprehensive monitoring system for producing images of the environment of the arc with a Bildwiederholfre acid sequence, a display device for displaying the images, and means for controlling the monitoring system for receiving at least two images with the refresh rate and different exposure times in a row.

Control systems of arc processes, in particular welding processes, using cameras are already well known. About recorded during the surveillance images, the operation, in particular the welding process, be observed and be influenced parameters. For example, WO 2012/119170 Al a method and a device for monitoring an electric arc process in which the burner performs an oscillating movement.

JP 2001 138049 A describes a method for monitoring a machining process, the machining area is taken with two cameras with different exposure times, and generates a synthetic image by means of image processing of these images and the display is presented.

In the observation of arc processes with a camera that resulting from the very high light intensity of the Lichtbo ¬ gene due to the high dynamic range of the monitored area is a fundamental problem. The dynamic range is the ratio of the largest to the smallest light intensity, ie the ratio of extremely high radiation intensity of the arc to the particularly low intensity around the light ¬ arc. With ordinary cameras, such a dynamic range can not be achieved. Special HDR (High Dynamic Range) cameras are also rarely able to present an arc process to ¬ satisfactorily and are also very expensive. The use of high-speed cameras with very high frame rate and low exposure time separates also made due to the size of such cameras and the cost.

Also covering the area of the arc would allow for ei ¬ ner reducing the dynamic range, however, is undesirable since this could not be observed relevant areas of the arc process. However, the entire context of the arc process is important for the observer, which in the case of a welding process from the end of

Welding wire across the arc, the molten pool, the seam welding ¬ and extends the area.

The object of the present invention is to provide a method and an apparatus for monitoring an operation performed by a burner arc process by which a better visual recognition of the monitored arc process can be achieved, despite the large differences in brightness in ¬ nerhalb of the observed area. On the ¬ wall and the size of such a device should

be minimal. Disadvantages of known methods and devices are to be avoided or at least reduced.

The inventive object is achieved in terms of method, in that are cut out from each of the at least two images with different exposure time portions and combined into a composite image and the composite image is displayed on the display device. The present invention therefore combines at least two consecutively recorded images with different exposure times and displays the same on the display device on. Thus is able through the different exposure times both the areas with high light intensity and the Be ¬ rich are displayed optimally with low light intensity and the user, both places with high

Light intensity and areas with low light intensity to consider optimally and to draw conclusions from the images. A special HDR camera to deal with the large dynamic range or an expensive high-speed camera is not necessary. By combining a plurality of images with different exposure times relatively inexpensive cameras (e.g., cameras in CMOS technology) can be used with ge ¬ ringer size that can be attached to the burner, in particular the welding torch. An image is composed of several partial areas, which areas are formed from the images having different exposure times. For example, the region of the arc, the ¬ cherweise is übli in the middle of the entire image, formed from a ent ¬ speaking lying in the middle portion of the image having the lowest exposure time, whereas the more distant from the arc ranges from partial areas of the images with the higher shutter speeds are formed. Such a composite image provides the viewer both in the areas with high light intensity and in the preparation ¬ chen with low light intensity high contrast and optimal image quality, so from all of the assembled ¬ compound image areas conclusions about the arc process can be made.

Advantageously, the at least two images are captured with an exposure time which is less than the Bildwiederholperiodendauer defined by the image ¬ repetition frequency, preferably between 0.01 ms and 20 ms. The maximum Belich ¬-up time is defi ¬ ned by the used refresh rate. For example, the maximum exposure time in a conventional refresh rate of 50 Hz is equal to 20 ms. The sub-regions can be formed for example by circular surfaces or circular rings. Such a configuration of the partial areas ¬ is preferred, although other shapes, ¬ example, square regions, or other geometric shapes may be selected arbitrarily.

If the transitions between the portions of the at least two images are smoothed using different exposure times, results in smoother transitions between the sections and thus a more uniform overall appearance. In this case, different ¬ Liche smoothing methods can be used, which allow the transition between the partial regions of the images having different exposure times according to extend, and the impression of a single image and not the composition is brought several ¬ rer images.

While recording at least two images a Be ¬ lighting can be activated. Through such illumination, the image quality can be increased even further. In arc processes, in particular, the lighting has been shown with red light to be particularly suitable as an arc in this wavelength range radiates little power. The lighting can be permanently activated or driven in synchronization with the exposure time of the camera. As illumination entspre ¬ sponding light emitting diodes or arrays may be a plurality of light emitting diodes used that can be arranged because of the small size simply ne ¬ ben or near the camera to the burner.

During the recording of at least two images with different exposure time ¬ Licher various filters can be applied. Through such filters, in particular gray value filter, the quality of the images, in particular further increased those with short Be ¬ exposure time. Particularly useful are switchable filters that can be formed for example by corresponding liquid crystals.

An offset between the at least two series-aufgenom- menen images with different exposure time can be corrected on the display device when displaying the images. Specifically, during rapid movement of the burner along the machining path is such a correction of the offset between two successively recorded images can prove a high quality picture or prove to be necessary. The correction is performed in software by a corresponding image processing prior to display of images on the display device.

The refresh rate is preferably chosen between 10 Hz and 100 Hz. Such values have been mentioned as preferred ¬.

In addition to the frames or fields, certain process parameters can be displayed. Such process parameters may, further interesting information about the arc process to the user. For example, in a

Welding process, the welding current employed, the Drahtvorschubge ¬ speed and the like. displayed on the display device ¬ to.

The inclusion of at least two images with different Be ¬ exposure time can be synchronized with the arc process ¬ the order still to be able to achieve better results. A

Such synchronization of the recordings of the at least two images with different exposure times is particularly useful in processes, in which the arc is temporarily removed by a short circuit, such as a short-circuited ¬ welding process. Thus, the images can be recorded at a time when no or only a weak arc burns, whereby the image quality can be improved due to the lack, bright arc. For example, the voltage signal can be used in a welding process for triggering the image capture. In this way, a representation could be achieved, in which the arc is almost hidden by images are recorded only times at which no arc burns.

The at least two images with different exposure times, the portions of these images and or or assembled from the Teilbe ¬ rich images at best can be stored together with zessparametern product for future use. For example, the stored data can be processed for quality analysis or for documentation purposes by an electric arc process.

Alternatively, or in addition to storing the at least two images with different exposure times, the Teilbe ¬ rich these images and or or to ¬ from the partial areas sammengesetzten images can be transmitted in any case together with process parameters as well as to certain destination addresses. In this way, the data obtained during the arc process can at distant targets, for example to a welding center, transmitted and processed there.

The inventive object is also achieved by an above-mentioned device for monitoring an electric arc process, wherein the control means for cutting portions from the at least two images with different exposure time and to sum up the sections into a composite image, and the display device for displaying the composite image is trained. A derarti ¬ ge device is relatively simply with standard and

inexpensive cameras and a corresponding control device realized. Among the advantages achieved thereby is referred to the above description of the method. When Rea ¬ capitalization of the controller by a microcontroller the necessary actions with appropriate PROGRAMMING ¬ tion of the microcontroller are relatively easy to implement.

The monitoring system may include a lighting. As mentioned above, a light in the red wavelength range is suited to a particular. Red light emitting phosphor ¬ diodes are available with a relatively high light output with small size.

The lighting can be formed diode for example, by an array of light. Such an array of light emitting diodes may be, for example, in addition to or placed around the optics of the camera of the monitoring system. Before the at least one camera, a preferably switchable filter may be disposed. Here, various technologies, such as liquid crystals are used.

For documentation purposes or in subsequent analyzes a memory for storing the at least two images with different exposure times, the portions of these images and or or composed of the partial areas images may be possibly provided together with process parameters.

For forwarding the information to remote evaluation devices or the like. can be at most provided together with process parameters comprises means for transmitting the at least two images with different exposure times, the portions of these images and or or the composite part from the preparation ¬ chen images.

The invention will be explained in more detail with reference to the accompanying drawings. in which:

Figure 1 is a schematic diagrammatic sketch of a burner for performing ¬ guide an electric arc process with a device for monitoring the arc process.

Figure 2 is a schematic diagram of the in-housed Lichbogenprozess ¬ nen and displayed images according to a variant embodiment. and

Fig. 3 is a flow diagram illustrating a variant of the method according to the invention.

Fig. 1 shows a diagrammatic schematic sketch of a burner 1 for conducting an electric arc process, in particular a welding torch for carrying out a welding process, with a device for monitoring the arc process. Between the burner 1 and the workpiece to be machined (not shown), an arc is ignited and 2 using a supplied via a welding wire material, a gap between two workpieces bridged or coating the surface of the workpiece. To control the arc process, a detection system 3 may be disposed on the burner 1, which includes a camera 4 and at most a lighting. 5 Before Ka ¬ mera 4 different filter 6 can be arranged to increase the Qua ¬ formality of the captured images. The burner 1 is connected via a hose pack 7 to the power source. 8 A control means 9 of the monitoring system 3 serves to ent ¬ speaking control of the camera 4. According to the invention, the control means 9 is formed to cooperate with the camera 4 to ¬ least two images P ± j depending refresh rate f B with different exposure times t Bj receive in succession, and these at least two images P ± j with different exposure times t Bj to the display device 10 display.¬ advantageous way be enough, from the captured images P ± j

different exposure times t Bj portions P 'j ± ¬ cut out and combined into a composite image Ρ'Ί zusammenge-, as will be described in more detail using the following figures 3 and 4. FIG.

The control device 9 can with a memory 11 for storing the at least two images P ± j with different exposure times t Bj, the portions P '± j these images P ± j and or or from the partial regions P' composite ± j images Ρ ' Ί, at most be associated with process parameters of the electric arc process. Furthermore, a transfer device 12 may be provided, via which the relevant data, in particular the images P ± j with different exposure times t Bj, the portions P '± j these images P ± j from the Teilbe ¬ rich P' composed i j images Ρ'Ί, at best process parameters can be sent to specific destinations. The

Transmission device 12 can in particular be formed by an appropriate interface to the World Wide Web or an internal data ¬ bank. Additionally, an interface may also be provided 13 to the controller. 9 A derarti ¬ ge interface 13 an acoustic Einrich ¬ tung example, can be controlled.

Fig. 2 shows a schematic diagram of the electric arc process taken on ¬ and displayed images P ± j according to an embodiment of the invention. In this embodiment, the four images Pn to P 14 with different exposure time t B i to t B 4 further processed by certain parts of P 'n to P' 14 from the images Pn cut to P 14, and assembled to form a composite image Ρ'Ί become. For example, from the image Pn with the lowest exposure time t B i, the portion P 'L1 in the center of the image P' n cut, which is located in the center of the arc with a particularly high intensity radiation ¬. Due to the low exposure time t B i, however, this range for the user is displayed optimally. The immediate vicinity of the arc is n by a ent ¬ speaking portion P '12 of the image P' in the form of a quadra ¬ tables frame with a slightly higher exposure time t B 2 detected. Finally, it is cut out from the picture P 14 with the maximum exposure time t B 4, the portion P '14 remote from the arc farthest. In the illustrated embodiment, the portions in the form of squares or square rings or frames are formed. However, there are any variations of sections, for example, circular areas or circular rings possible.

The portions P 'n to P' 14 Ρ'Ί are summarized and displayed on the display device 10 now becomes a more composite ¬ th image. Thus, a single image representing sämtli ¬ surface areas of the arc process optimal, namely, the center of the arc by the partial area P results 'L1 of the image Pii with the lowest exposure to the outer Randbe ¬ rich, the through part P' 14 of the image P 14 with the maximum exposure time t B4 is formed. The transitions between the sections P 'L1 to P' 14 may also be smoothed accordingly so that a harmonious composite image Ρ'Ί re ¬ consulted.

Finally, Fig. 3 shows a flow diagram illustrating a variant of the method according to the invention. When monitoring of the electric arc process in accordance with step 100, a first image Pn is provided with a first exposure time t B i (step 101), then a second picture P 12 with an exposure ¬ time t B2 (step 102), then a third image P 13 with a Be ¬ exposure time t B3 (step 103), and finally a fourth image P 14 with an exposure time t B4 (step 104) was added. The recordings of the images P ± j with different exposure times t Bj are repeated with the selected refresh rate f B. It can thus the images P ± j are taken as shown with the broken line without interruption, so that substantially real-time processing can be realized. In accordance with step 105, the captured images Pn are further processed and to P 14 optionally stored, in particular from the images Pn to P 14 corresponding portions P 'n to P' 14 out ¬ cut. The type of sections can be freely selectable predefined or user. The further processing of the images Pn to P 14 may be immediately after the recording of each image P ± j, or even only after all the images Pn were added to P 14, take place. The further processing is preferably carried out gradually, so after an image P ± j has been recorded. In accordance with query 106, the selection is made whether a smoothing (step 107) is to be made or not. In case of performing a smoothing the transitions between the sections P are smoothed in accordance with 'L1 to P' 14 through P 14 of the images Pn with different exposure times t i to t B B. 4 According to step 108 the representation of the partial images formed by the in step 105, P 'ii to P' 14 composite overall image Ρ'Ί carried out on the display device ¬. With the selected refresh rate f B jumps back to the beginning of the process and with the recording of the next pictures P ± j with different exposure times t Bj started. After completion of the arc process, the method is ended in step 109th Accordingly, the partial images P '± j are renewed with the refresh rate f B, so resulting in a film for the observer in the overall image ¬ Ρ'Ί.

The inventive method and the Vorrich ¬ processing according to the invention enable an optimal representation of a Lichtbogenpro ¬ zesses despite the high light intensity of the arc.

Claims

claims:
1. A method for monitoring a with a burner carried out (1) arc process, particularly the welding process, wherein the burner (1) performs a motion along a machining path (x), and with the aid of the burner (1) ver ¬-bound, at least one camera (4) comprising
Monitoring system (3) images (P ±) around the arc (2) with a refresh rate (f B) are taken and the images (P ±) on a display device (10) are shown, wherein with the refresh rate (f B) in succession at least two images are captured (P ± j) with different exposure times (t Bj), characterized in that from each of the at least two images cut out (P ± j) with different exposure times (t Bj) subregions (P '± j), and is shows ¬ is a composite image are combined (Ρ'Ί), and at ¬ sammengesetzte image (Ρ'Ί) on the display device (10).
2. The method according to claim 1, characterized in that the at least two images (P ± j) with an exposure time (t B j) up ¬ taken which is smaller than the Bildwiederholperiodendauer defined by the Bildwiederholfre acid sequence (f B) (T B = l / f B), preferably between 0.01 ms and 20 ms.
3. The method of claim 1 or 2, characterized in that said partial areas (P '± j) are formed by circular surfaces or circular rings.
4. The method according to any one of claims 1 to 3, characterized in that the transitions between the sections (P '± j) of the smoothed at least two images (P ± j) with different exposure times (t Bj).
5. The method according to any one of claims 1 to 4, characterized in that during recording at least two images (P ± j) an illumination (5) is activated.
6. A method according to any one of claims 1 to 5, characterized in that (P ± j) with different exposure times (t Bj) different filters (6) are applied during the recording of said at least two images.
7. A method according to any one of claims 1 to 6, characterized in that an offset (Ad) between the at least two out ¬ behind the other captured images (P ± j) with different exposure times (t Bj) in displaying the pictures (P ± j) is corrected to the Ad ¬ feed mechanism (10).
8. A method according to any one of claims 1 to 7, characterized in that the refresh rate (f B) between 10 Hz and 100 Hz is selected.
9. The method according to any one of claims 1 to 8, characterized in that in addition to the images (P ± j) or fields (P'ij) Process parameters are displayed.
10. A method according to any one of claims 1 to 9, characterized in that the opening of at least two images (P ± j) with different exposure times (t Bj) is synchronized with the arc process.
11. A method according to any one of claims 1 to 10, characterized in that the at least two images (P ± j) with differing ¬ cher exposure time (t B j), the partial regions (P'ij) of these images (P ± j), and respectively . or which consist of the partial regions (P'ij) together amount ¬ translated images (Ρ'Ί) at best be stored together with process parameters.
12. The method according to any one of claims 1 to 11, characterized in that the at least two images (P ± j) with differing ¬ cher exposure time (t B j), the partial regions (P'ij) of these images (P ij) and or or consisting of the partial regions (P'ij) together amount ¬ translated images (Ρ'Ί) be at most transmitted together with process parameters.
performed 13. Apparatus for carrying out a method for monitoring one with a movement along a machining path (x) exporting burner (1)
Arc process, particularly the welding process, according to any one of claims 1 to 12, with the burner (1) composites ¬ NEN, at least one camera (4) comprehensive monitoring system (3) for producing images (P ±) around the arc (2 ) (with a refresh rate f B), a display device (10) for displaying the pictures (P ±), and means (9) for controlling the monitoring system (3) for receiving at least two images (P ± j) with the refresh rate (f B) and different exposure times (t Bj) one behind the other, as ¬ characterized by that the control device (9) for cutting out portions (P '± j) from the at least two images (Pi j) with different exposure times (t Bj) is formed and to ¬ summary of the partial areas (P '± j) into a composite image (Ρ'Ί), and the display device (10) for displaying the composite image (Ρ'Ί).
14. The apparatus according to claim 13, characterized in that the monitoring system (3) comprises an illumination (5).
15. The device according to claim 14, characterized in that the lighting (6) is formed by an array of light emitting diodes.
16. Device according to one of claims 13 to 15, characterized in that, before the at least one camera (4) is arranged in front ¬ preferably switchable filters (6).
17. Device according to one of claims 13 to 16, characterized in that a memory (11) for storing the at least two images (P ± j) with different exposure times (t Bj), the portions (P '± j) of these images ( P ± j) and or or (from the partial regions P '± j) composite images (Ρ'Ί) is at most provided together with process parameters.
18. A device according to any one of claims 13 to 17, characterized in that a device (12) for transmitting the at least two images (P ± j) with different exposure times
(Yr) of the partial regions (P '± j) of these images (P ± j) and respectively or consisting of the partial areas (P' ± j) composite images (Ρ'Ί) is at most provided together with process parameters.
PCT/AT2015/050236 2014-09-24 2015-09-24 Method for monitoring an arc process carried out by a burner, and device for carrying out said method WO2016044874A1 (en)

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EP3232656A1 (en) * 2016-04-04 2017-10-18 Illinois Tool Works Inc. Dynamic range enhancement systems and methods for use in welding applications
US9918018B2 (en) 2016-04-04 2018-03-13 Illinois Tool Works Inc. Dynamic range enhancement systems and methods for use in welding applications

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