Method for operating an extinguishing system

Abstract

A method for operating an extinguishing system comprises - an electronic controller (15) having a computer module (18) for data processing purposes and a storage apparatus (17), wherein the controller (15) comprises an image processing apparatus that receives and evaluates data from a camera (8), - at least one extinguishing agent sprayer (9) that is connected to the controller and that is connected to an extinguishing agent line in order to be supplied with extinguishing agent, and - at least one camera (8) connected to the controller. The image processing apparatus evaluates image regions that are indicative of a hotspot (6) with regard to isothermal regions (22), compares these regions (22) with stored models and, on the basis of the comparison, actuates the extinguishing agent sprayer (9) so as to dispense extinguishing agent or prevents the dispensing of extinguishing agent.

Description

[0001] Procedure for operating an extinguishing system

[0002] Description

[0003] The invention relates to a method for operating an extinguishing system with an electronic control system having a computer module for data processing and a memory device, wherein the control system comprises an image processing device which receives and evaluates data from the camera, at least one extinguishing agent dispenser connected to the control system, which is connected to an extinguishing agent line for supplying extinguishing agent, and at least one camera connected to the control system,

[0004] Typically, a fire in a warehouse, for example, is detected at a fire alarm temperature of 80°C. An extinguishing system is activated, spraying or flooding a large amount of extinguishing agent, such as water or firefighting foam, into the fire area, thereby extinguishing the fire. Sprinkler systems and significantly more powerful deluge systems or extinguishing monitors, also known as fire cannons or water cannons, are used as extinguishing systems. For the purposes of this application, all extinguishing systems are referred to individually and collectively as extinguishing agent throwers.

[0005] Due to the large amount of extinguishing agent that is released relatively quickly, relatively significant damage can occur, so that incorrect extinguishing must be avoided while ensuring the highest possible safety for reliable fire fighting.

[0006] Thermal disturbances that can lead to false extinguishing are caused, for example, by a hot exhaust or a hot wheel loader engine. During operation, these vehicles reach high temperatures above the fire alarm temperature relatively quickly.

[0007] WO 2011 / 103915 A1 discloses a thermal monitoring device for large warehouses, waste incineration plants, production facilities, and the like, using an extinguishing system to extinguish a fire. The extinguishing system consists of a combination of one or more infrared cameras and one or more controllable fire extinguishing cannons in the monitored space, with at least one infrared camera detecting a fire. The source of the fire is localized in its initial phase using intelligent evaluation software and, based on the temperature increase detected by the infrared camera during the initial phase, is automatically extinguished using at least one intelligently controlled fire extinguishing cannon.

[0008] Furthermore, EP 3 167 937 A1 discloses a method for eliminating thermal interference during infrared and video early fire detection in waste incineration plants, recycling plants, open-air storage facilities, and the like. This method uses a noise or vibration analysis of vehicles or other thermal interference sources, such as machine drive motors, located in the area to be detected in order to be able to distinguish between a fire and thermal interference based on the noise pattern (e.g., that of a wheel loader exhaust) in the case of an object whose temperature is above the fire alarm temperature. Furthermore, a distinction is made between daytime and nighttime operation by measuring the noise level. During nighttime operation, for example, there are no vehicles driving around and thus considerably fewer interference variables.Extinguishing systems are known, for example, from DE 10 2016 104 349 A1, DE 10 2011 053 373 A1, and DE 21 2010 000 060 U1 and are increasingly being used to protect waste bunkers and storage facilities, both outdoors and indoors. For fire detection and early fire detection, these predominantly automatic extinguishing systems comprise at least one camera, which is usually mounted on top, for example, on a ceiling or a mast, and is pivoted over the area to be monitored.If a fire source, a smoldering ember, or an area with an unusually high temperature for the material being monitored, indicating a fire incipient, possibly even deeper below the thermographically monitored surface (these higher-temperature locations are also referred to as hot spots), is detected, the control system directs an extinguishing agent dispenser toward this fire source and opens a valve so that the extinguishing agent flows out at a relatively high pressure and in a relatively large quantity. Due to inaccuracies in the detection of the fire source and in the targeting of the extinguishing agent dispenser, the extinguishing agent dispenser is often swiveled vertically and / or horizontally to extinguish the fire.

[0009] DE 102 53 360 A1 discloses an early fire detection system comprising an infrared radiation detection device having a geometric resolution of no more than 1 cm x 1 cm, a pivoting device coupled to the infrared radiation detection device such that an area is scanned row by row and / or column by column by the infrared radiation detection device, a comparison device comparing an output signal of the infrared radiation detection device corresponding to the energy quantity of the detected infrared radiation with a predetermined threshold value and determining whether the output signal of the infrared radiation detection device exceeds the threshold value, an output device which, in response to a signal from the comparison device, outputs an exceedance of the threshold value and coordinates of a region of the scanned area from which infrared radiation is emitted,which led to the threshold value being exceeded, and a control device which carries out the control and coordination of the infrared radiation detection device, the pivoting device, the comparison device and the output device.

[0010] Furthermore, KR 10 1 297 121 B1 discloses a tunnel fire detection device using an infrared image with an infrared camera, an infrared image acquisition and pre-processing unit.

[0011] Furthermore, KR 10 0 690 661 B1 describes a fire extinguishing device and method in which a fire is detected using a heat sensor, wherein a shape and color pattern of a heat source is extracted using a camera when the fire is detected. The pattern is compared with a preset fire pattern, and the fire is automatically assessed according to the comparison result.

[0012] The invention is based on the object of creating a method of the type mentioned above with which interference in optical fire detection is reduced, in particular by distinguishing critical hotspots from non-critical hotspots.

[0013] For the purposes of the invention, a hotspot is defined as a hot spot above a critical temperature, for example, the fire pre-alarm temperature and / or the fire alarm temperature, which can be a fire source or another hot component in a monitored area. The critical temperature is predetermined and stored in the memory device.

[0014] According to the invention, this problem is solved by the image processing device evaluating image areas that indicate a hotspot with respect to isothermal areas, comparing these evaluated areas with stored patterns, and, depending on the comparison, controlling the extinguishing agent dispenser to discharge extinguishing agent or preventing the discharge of extinguishing agent. In areas equipped with extinguishing systems, such as storage, production, recycling, or disposal facilities, vehicles are frequently used that cause false alarms and, potentially, the associated incorrect extinguishing, which must be avoided, particularly due to hot exhaust mufflers.The mufflers and / or exhaust pipes and / or engine and / or transmission blocks of vehicles designed as wheel loaders, for example, are generally relatively open to the monitoring cameras, which can be designed as video cameras or infrared cameras, and, depending on the manufacturer and / or type, often have similar geometries and, during operation, often similar temperature profiles, which can be displayed and recognized as thermal images. The thermal images are relatively clearly and simply structured if an evaluation is carried out according to isotherms and temperature ranges are defined on the control system or the image processing device, which are displayed and / or evaluated in a color, a gray tone, a line and / or dot pattern or the like.

[0015] To prevent or reduce false extinguishing, images can be created as patterns, particularly of the vehicles deployed within the monitored area or their hot components, which may trigger an alarm due to a temperature above the stored threshold temperature for a fire alarm. Similar to actual image processing, temperature ranges can be defined that exhibit characteristic geometries and / or surfaces in an isothermal representation. These patterns can be generated, for example, using reference thermal images or calculating thermal conditions.

[0016] The image processing system is able to display the isothermal areas of the actual thermal images available in real time on a screen and compare them with the stored patterns. If the comparison indicates a known hot component, such as an exhaust muffler, gearbox, or engine block, the extinguishing agent dispenser will not be triggered to discharge extinguishing agent. This could, for example, result in an alarm being triggered on a screen to enable a human observer to visually inspect the area and, if necessary, to manually trigger the extinguishing agent dispenser to discharge extinguishing agent. If the comparison of the image with the isothermal areas and the stored patterns does not indicate a known and non-critical heat source, i.e. a hotspot, the extinguishing agent dispenser will be triggered to discharge extinguishing agent.The stored patterns represent known and non-critical heat sources.

[0017] When analyzing the isothermal regions, both temperature zones and / or temperature ranges as well as the areas of the respective temperature zones and / or temperature ranges are appropriately taken into account. This is done on the computer side to simplify the representation and analysis of the areas of interest, if necessary.

[0018] Furthermore, it is expedient to compare the actual areas with the patterns stored as geometric patterns and / or color gradient and / or temperature gradient patterns.

[0019] According to a further development, a noise and / or vibration analysis is carried out on the control system by recording at least one noise pattern or by measuring the noise level of vehicles or other thermal interference sources, such as machine drive motors, in the area to be detected. When measuring or recording noise patterns, volume thresholds, for example, are determined and used as threshold values ​​to decide whether fire extinguishing is triggered. Of course, a vibration analysis of the monitored room is also carried out using vibration sensors, and the respective actual data is compared with threshold values ​​and / or patterns on the control system in order to trigger the control of at least one extinguishing agent dispenser to discharge extinguishing agent if the threshold values ​​are exceeded or if there are deviations from the stored patterns.Vibration analysis uses analog and / or digital filters, directional microphones, external microphones for a 3-dimensional noise pattern, fire-specific noise filters and / or vibration sensors that are connected to the control system or implemented in the control system. When analog and / or digital filters are used in noise analysis, it can be determined which vehicle or type of vehicle, e.g. wheel loader, truck or similar, is in the area to be detected or whether it is a specific operating area of ​​a system to be monitored. This can also be used to filter out external noise. If at least one directional microphone is used in parallel with the infrared or video analysis, the disturbance can be spatially assigned to the currently detected object.When using multiple external microphones, a 3-dimensional noise pattern can also provide information about the devices being operated and include them in the analysis.

[0020] In one embodiment, the image processing device can be switched between a working mode and a standby mode. In standby mode, the controller triggers the extinguishing agent dispenser to discharge extinguishing agent independently of a comparison of the isotherms of hotspots evaluated by the image processing device in images from the camera configured as a thermal imaging camera or video camera with stored patterns. Switching from working mode to standby mode can be determined, for example, based on times and calendar dates. During working hours, thermal disturbances and the associated occurrence of images, particularly thermal images, which may indicate a warm component of a vehicle are possible.During rest periods, i.e. in particular at night, on weekends and holidays or the like, these thermal disturbances and the associated thermal images generally cannot occur, and at least one extinguishing agent dispenser is controlled to discharge extinguishing agent without further data comparison of actual images with patterns or sample images. According to a further development, the extinguishing agent dispenser is controlled to discharge extinguishing agent using an input device connected to the control system, independently of a comparison of the isotherms of hotspots in camera images evaluated by the image processing device with stored patterns. The input device can, for example, comprise a touchscreen, a joystick or the like and essentially enables override of the control system.This allows operating personnel to influence the discharge direction and / or discharge rate of an extinguishing agent dispenser, independent of data from the control system or the image processing system, in order to reliably extinguish a fire visually detected on a monitor or touchscreen. Likewise, the input device can be used to terminate or prevent an extinguishing process, in particular the discharge of extinguishing agent via the extinguishing agent dispenser, should a false alarm occur that is visually detected by the operating personnel.

[0021] To scan the space to be observed, the camera, for example an IR or video camera, is pivoted around a mounting axis in an oscillating or continuous rotation, and the data of the resulting thermal image is transmitted to the image processing unit. When the camera is pivoted, a distorted spherical image, a circular image, or a circular ring image is created, for example, which allows the hotspots to be identified by their color.

[0022] It is understood that the features mentioned above and those to be explained below can be used not only in the respective combinations specified, but also in other combinations. The scope of the invention is defined solely by the claims.

[0023] The invention is explained in more detail below using an exemplary embodiment with reference to the accompanying drawing.

[0024] It shows: Fig. 1 a schematic representation of a room to be monitored in which the method according to the invention can be applied and

[0025] Fig. 2 is a partial view of a hot component located in the monitored room, the detection of which should not cause the discharge of extinguishing agent.

[0026] The method is used, for example, in a room 1 of a processing plant, for example, for the processing of recycled material, or in a waste incineration plant, or in a storage area for combustible objects, such as a storage area for rubber tires, wood, plastics, or the like, or in a production facility. In the room to be monitored, material 2, such as recycled material, waste, or stored goods, is typically transported by a wheel loader 3.Such a wheel loader 3, which is listed as an example for any motor vehicle, comprises at least one heat-generating internal combustion engine and an exhaust 4 which is warm during operation and which usually has a characteristic muffler 5, whereby these heat-radiating components can represent the sources of fire as thermal disturbances, for example so-called hotspots 6, in an image 20 which is designed as a thermographic image or a thermally evaluated video image or which is computer-assisted and processed by means of an image processing device or, of course, the image data thereof.

[0027] In order to monitor the monitored room 1, which may also be a warehouse or an outdoor storage area, for the occurrence of a fire in the stored material 2 and, if necessary, to initiate automatic extinguishing of the fire, an extinguishing system is installed which essentially comprises a camera 8 designed as a thermal imaging camera 7, for example an infrared camera, and an extinguishing agent thrower 9, which can also be referred to as an extinguishing monitor or extinguishing thrower. The camera 7 and the extinguishing agent thrower 9 are fastened at specific positions in a defined orientation, in particular in the room 1 and / or relative to one another, such that, for example, a fastening axis 10 of the camera 8, which for example comprises a lens 12, is aligned parallel to a fastening axis 13 of the extinguishing agent thrower 9.The camera 7 can be pivoted, for example, by means of a motor 21, in particular a stepper motor, by up to 360° around the mounting axis 10, in particular in an oscillating manner. Furthermore, the camera 8 or its optical axis 14 assumes a defined position relative to the mounting axis 10. If the space 1 to be monitored has special conditions, the camera 7 can be pivoted such that the axis 14 forms a larger or smaller angle to the mounting axis 10. Even in this position, the camera 8 can be pivoted by means of at least one associated motor 21, which can be designed as a stepper motor.

[0028] The extinguishing agent thrower 9 can be pivoted about two axes, as indicated by the double arrows 11 assigned to the extinguishing agent thrower 9, namely about its mounting axis 13 and an axis oriented at an angle offset therefrom. The extinguishing agent thrower 9 is connected to pipes or hoses for the extinguishing agent. Furthermore, the extinguishing agent thrower 9 is coupled to an electronic controller 15, which in this case is designed as a tablet computer 16 and comprises at least one memory device 17 for readable storage of data, a computer module 18 for data processing, and a screen designed as a touchscreen 19. The touchscreen 19 serves both as an input unit and for displaying the images 20 recorded by the thermal imaging camera 7. The thermal imaging camera 7 is of course also connected to the tablet computer 16, which serves as the computer controller 15.

[0029] Of course, the attachment of the at least one camera 8 and the at least one extinguishing agent dispenser 9 to masts, room walls or ceilings, or similar, particularly stationary components, is possible. The memory device 17 of the electronic control unit 15, which also houses the image processing device, stores the basic geometric data of the room 1, which are measured on-site as actual data. This basic geometric data of the room 1 describes the floor area, i.e., the dimensions of the floor 3 and the height of the room 1. Furthermore, the coordinates to which the camera 7 and the extinguishing agent dispenser 8 are attached are stored. Furthermore, standard dispenser curves determined by the manufacturer can describe the throw distances of the extinguishing agent under a specific pressure and predefined extinguishing agent dispenser settings. T as well as various software and image processing facilities.

[0030] The software and image data processing devices ensure, on the one hand, the detection of a hotspot 6 that could develop into a fire. In order to avoid false extinguishing caused by known heat sources, for example the exhaust muffler 5 of the wheel loader 3 shown in the present example, image areas that indicate a hotspot 6 are evaluated on the image processing device with regard to isothermal areas 22 and these isothermal areas 22 or isothermal curves are compared with stored patterns. When evaluating the images of the isothermal areas 22, both temperature zones and / or temperature ranges as well as areas of the respective temperature zones and / or temperature ranges are taken into account. In the present case, for example, a first isothermal area 22.1 with an average temperature of approximately 450°C and a size of approximately 0.1 m 2, a second isothermal area 22.2 with an average temperature of about 350°C and a size of about 0.15 m 2 , a third isothermal area 22.3 with an average temperature of about 240°C and a size of about 0.25 m 2 , a fourth isotherm area 22.4 with an average temperature of about 170°C and a size of about 0.4 m 2 and a fifth isotherm area 22.5 with an average temperature of about 120°C and a size of about 0.5 m 2to be recognized. At a fire alarm temperature of 70°C or greater, each of these isothermal regions 22 of the exhaust muffler 5 of the wheel loader 3 would trigger an alarm and possibly a false extinguishing action triggered by the controller 15. Since a pattern with a corresponding temperature Z-area distribution is known on the image processing device in this case, the image processing device concludes that the exhaust muffler 5 is present and does not trigger the discharge of extinguishing agent. Of course, an alarm can be triggered, for example, in the form of a pre-alarm on the tablet computer 16, which can be evaluated by operating personnel and overridden if necessary. It is obvious to a person skilled in the art that in addition to the temperature Z-area distributions, characteristic geometric data can also be stored on the image processing device.If, in addition, corresponding data of various common exhaust mufflers of wheel loaders 3 or other motor vehicles or patterns of isothermal areas of engine blocks or the like not shown are stored and the image data recorded with the camera 8 are evaluated on the controller 15 with the image processing device according to the occurrence, a large number of incorrect deletions can be avoided.

[0031] In order to be able to account for temperature changes or temperature profile changes or area changes, which represent deviations of the corresponding actual data from the stored patterns and for different ambient temperatures, the ambient temperature is also measured, and a corresponding value is applied to the controller 15, which takes this ambient temperature into account when comparing the actual isothermal regions 22 with stored patterns, for example, using a factor assigned to the ambient temperature. The factor particularly takes into account the fact that the pattern was created or recorded with a camera based on, for example, an ambient temperature of 20°C, and the actual isothermal regions 22 can be, for example, colder and / or smaller at a relatively low ambient temperature, and, for example, warmer and / or larger at a relatively high ambient temperature.Further changes may result from changing distances, for example, between the exhaust muffler 5 or another heat source and the camera 8, or from lens-related distortion. These changes can be taken into account by the image processing system insofar as the percentage reference values ​​of the individual isothermal regions 22 remain the same and are therefore comparable with the stored patterns.

[0032] In order for operating personnel to be able to quickly and reliably identify the relevant heat sources, which represent hotspots 6, on the tablet computer 16, the thermal images evaluated by the image processing device are displayed on the screen with the color-graded isothermal areas 22.

[0033] Overall, the extinguishing of the hotspots 6, which represent sources of fire and are not marked as known by the image processing device, takes place automatically by the control system 15 directing the extinguishing agent dispenser 9 to the hotspot 6 and controlling it to discharge extinguishing agent.

[0034] In order for operating personnel to be able to override this automatic extinguishing, an alignment and control of the extinguishing agent dispensers 9 for extinguishing is provided by means of the touchscreen 19 and / or a joystick as an input device on a computer with an associated screen.

[0035] To achieve a relatively high level of safety, the controller 15 can be switched to at least one working mode and one idle mode with the image processing device. In the idle mode, the controller 15 controls the extinguishing agent dispenser 9 independently of a comparison of the isothermal regions 22 of hotspots 6 in images from the thermal imaging camera 7, which are evaluated by the image processing device, with the stored patterns for dispensing extinguishing agent, and different isothermal characteristics are evaluated in the various working modes. Thus, it is also possible for the idle mode to be defined as a special working mode and / or for such an idle mode to be activated, for example, during non-working hours, when there are usually no known heat sources in the room 1 to be monitored and a hotspot 6 is therefore very likely to be a source of fire.

[0036] At least the camera 8 is assigned a laser 23 aligned in the image recording direction, which can be designed for distance measurement and / or for emitting a pulsed laser beam.

[0037] The position of the hotspot 6 recorded by the camera 7 can be described with relatively little computational effort and the extinguishing agent dispenser 9 can be tracked relatively precisely, since in particular the fastening axes 10, 13 on both sides are aligned parallel to one another, so that deviations or errors of lesser significance arise from the different fastening points, as long as the distance between the extinguishing agent dispenser 9 and the camera 7 is relatively small, for example up to about 5 m, preferably up to about 2 m. However, the error is generally so small that the fire can be extinguished at this point with the extinguishing agent. The error corresponds at most to the distance between an axis 14 of the camera 7 and a quasi exit axis of the extinguishing agent dispenser 8. In terms of altitude, the camera 7 and the extinguishing agent dispenser 8 can be offset from one another, for example by about 1 m, so that the extinguishing agent dispenser 8, for example,The camera 7 is not destroyed with extinguishing agent. The height difference is relatively insignificant for the actual accuracy. For larger, significant height differences, the vertical angular offset of the extinguishing agent dispenser 8 can be calculated via the control system 15, or the extinguishing agent dispenser 8 can be swiveled vertically over a larger range.

[0038] Using the stored actual data and the coordinates of the mounting points of the camera 8 and the extinguishing agent thrower 9 as well as the distance data, which are determined, for example, by means of the laser 23, all points in the room 1 can be calculated on the control unit 15, for example by means of triangulation, and the extinguishing agent thrower 8 can be quickly aligned by appropriately controlling the motors 21 assigned to it, so that a fire can be extinguished.

[0039] In normal operation or control mode, the camera 7 continuously pivots to monitor the entire room 1, oscillating or rotating around the mounting axis 10, if necessary by up to 360°.

[0040] Of course, additional detection devices 23, for example, for operating noises and / or vibrations, can be connected to the control system 15. These devices provide data to ensure reliable fire extinguishing and prevent false extinguishing. For example, if no known engine noises are present at the control system, then no known isothermal zones 22 can be present in the room 1 to be monitored.

[0041] Of course, in such a monitoring, corresponding acoustic data or the like are stored, for example, on the storage device 17 of the controller 15, which can be assigned, for example, to the wheel loader 3, or other known motor vehicles or operating equipment.

[0042] To further improve the detection accuracy of thermal interference sources and to reduce false extinction,

[0043] Controller 15 performs a noise and / or vibration analysis by recording and evaluating at least one noise pattern from vehicles located in the area to be detected or other thermal interference sources, such as drive motors of machines or the wheel loader 3. To determine at least one noise pattern or noise level in the room 1 to be monitored, at least one microphone 24 is provided, which is connected to controller 15. To detect vibrations, at least one vibration sensor 25 is attached in the room 1 to be monitored, which is connected to controller 15. The vibration sensor 25 can also be, for example, a special low-frequency microphone.

[0044] The controller 15 evaluates the recorded volume and vibration data, also by means of analogue and / or digital filters, and compares them with threshold or limit values ​​or patterns, in particular noise patterns, stored in the memory device 17 in order to trigger the at least one extinguishing agent dispenser to discharge extinguishing agent if the controller 15 indicates a fire source when the threshold values ​​are exceeded or if there are deviations from the stored patterns and a comparison with the patterns of the isothermal areas 22.

[0045] Reference symbol

Claims

Claims: Method for operating an extinguishing system with an electronic control unit (15) comprising a computer module (18) for data processing and a storage device (17), wherein the control unit (15) comprises an image processing unit that receives and evaluates data from a camera (8), at least one extinguishing agent dispenser (9) connected to the control unit, which is connected to an extinguishing agent line for supplying extinguishing agent, and at least one camera (8) connected to the control unit, characterized in that the image processing unit evaluates image areas that indicate a hotspot (6) with respect to isothermal areas (22), compares these areas (22) with stored patterns, and, depending on the comparison, controls the extinguishing agent dispenser (9) to discharge extinguishing agent or prevents the discharge of extinguishing agent.A method according to claim 1, characterized in that, during the image evaluation of the isothermal areas (22), both temperature zones and / or temperature ranges as well as areas of the respective temperature zones and / or temperature ranges are taken into account. A method according to claim 1, characterized in that the comparison of the actual areas (22) with the patterns stored as geometric patterns and / or color gradient and / or temperature gradient patterns is carried out. A method according to claim 1 or 2, characterized in that a measured ambient temperature value of the environment is received at the controller (15). in which the camera (8) is located, and depending on the ambient temperature value, the image processing device scales the isothermal areas (22). Method according to one of claims 1 to 3, characterized in that the patterns are created and stored based on actual isotherms. Method according to one of claims 1 to 5, characterized in that the thermal images evaluated by the image processing device with the color-graded isothermal areas (22) are displayed on a screen. Method according to one of claims 1 to 6, characterized in that a noise or...Vibration analysis is performed by capturing at least one noise pattern and / or measuring the noise level of vehicles or other thermal disturbance sources, such as machine drive motors, located in the area to be detected, wherein, when capturing noise patterns or measuring the noise level, the volume thresholds are determined and used as threshold values ​​to decide whether fire extinguishing is triggered. A method according to any one of claims 1 to 4, characterized in that the image processing device can be switched to at least one operating mode and a standby mode, wherein in the standby mode the controller (15) controls the extinguishing agent dispenser (9) independently of a comparison of the isotherms of hotspots (6) in images of the camera (8) evaluated by the image processing device with stored patterns to discharge extinguishing agent.Method according to one of claims 1 to 10, characterized in that the extinguishing agent launcher (9) can be controlled by an input device connected to the control unit (15), independently of a comparison of the isotherms of hotspots (6) evaluated at the image processing unit in the image processing unit. a thermal imaging camera (7) with stored patterns and / or noise or vibration analysis is used to dispense extinguishing agent. A method according to one of claims 1 to 9, characterized in that the camera (8) is pivoted oscillating or rotating about a mounting axis (10) and the data of the resulting thermal image are transmitted to the image processing device.

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