Fire Detection Systems

Abstract

To provide a fire probe system for suppressing the misrecognition of a fire caused by sunlight.SOLUTION: A fire probe system comprises: a plurality of probe devices 10 for probing a fire source position; and a general controller 20 for identify a fire source position from results of probe by the plurality of probe devices. Each of the plurality of probe devices includes: an infrared camera 12 for capturing an inside image of a range in charge so as to acquire detection information including temperature information and fire source position information; and an individual controller 11 for executing an identification process of identifying the fire source position on the basis of the detection information acquired by the infrared camera. A fire monitoring range is covered by the ranges in charge by at least two probe devices among the plurality of probe devices. When the position data of a fire source corresponding to the same position is acquired from the at least two probe devices among the plurality of probe devices, the general controller identifies the position data of the fire source corresponding to the same position as a fire source position in the fire monitoring range.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present disclosure relates to a fire detection system for locating a fire source within a fire monitoring area. [Background technology]

[0002] There is a system in which a fire detection device is arranged for each compartment in a large space and a fire source position is calculated (for example, see Patent Document 1). The fire detection system in Patent Document 1 has a configuration in which multiple detection devices are arranged within a fire monitoring range and the fire source position data identified by the detection device located closest to the same fire source position is adopted.

[0003] By being provided with such a configuration, the fire exploration system according to Patent Document 1 can suppress deterioration in the calculation accuracy of the fire source position and suppress an increase in the time required to calculate the fire source position. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] JP 2020-119014 A Summary of the Invention [Problem to be solved by the invention]

[0005] Domed baseball stadiums are an example of large spaces where fire monitoring is required. Some domed baseball stadiums use natural grass. In such cases, a roof that can be opened and closed to allow sunlight in to help the grass grow is sometimes used.

[0006] When fire monitoring is performed with the roof open, there is a risk that reflected sunlight may be mistaken for a fire. If a fire is mistakenly recognized, it may not only be an alarm to inform the fire, but also a water spraying action to extinguish the fire. Therefore, in order to improve the reliability of the fire detection system, it is important to suppress false recognition of fire caused by sunlight and to prevent unnecessary alarm or water spraying actions.

[0007] In addition, suppressing false positives of fires is a common issue not only in dome stadiums but also in various fire monitoring areas. Therefore, in fire monitoring areas affected by reflected sunlight, a fire detection system that suppresses false positives caused by sunlight is strongly desired.

[0008] The present disclosure has been made to solve the above-mentioned problems, and aims to provide a fire detection system that can suppress false recognition of fires caused by sunlight. [Means for solving the problem]

[0009] The fire detection system disclosed herein is a fire detection system including a plurality of detection devices installed to detect the location of a fire source within each of pre-assigned coverage areas within a fire monitoring range, and a central controller that identifies the location of a fire source within the fire monitoring range from the detection results of the plurality of detection devices, each of which has an infrared camera that captures an image of its coverage area to obtain detection information including temperature information and fire source location information corresponding to each of a plurality of pixels, and an individual controller that executes a determination process to determine the location of the fire source within its coverage area based on the detection information obtained by the infrared camera, and outputs location data of the identified fire source if the fire source location is identified by the determination process, and the fire monitoring range is covered by the coverage areas of at least two of the plurality of detection devices, and when the central controller obtains location data of a fire source corresponding to the same location from at least two of the plurality of detection devices, it determines the location data of the fire source corresponding to the same location as the fire source location within the fire monitoring range. Effect of the Invention

[0010] According to the present disclosure, a fire detection system capable of suppressing false recognition of fires caused by sunlight can be obtained. [Brief description of the drawings]

[0011] [Figure 1] 1 is an overall configuration diagram of a fire exploration system according to a first embodiment of the present disclosure. [Diagram 2] 2 is an explanatory diagram relating to an instantaneous vertical monitoring range and an instantaneous horizontal monitoring range of the infrared camera according to the first embodiment of the present disclosure. FIG. [Diagram 3] FIG. 1 is an explanatory diagram comparing a case in which a fire source is detected by two infrared cameras with a case in which reflected sunlight that is a source of a false alarm and is not a fire alarm by two infrared cameras in the first embodiment of the present disclosure. [Figure 4]FIG. 11 is a top view for explaining the arrangement and monitoring range of three infrared cameras in a fire exploration system according to a second embodiment of the present disclosure. [Diagram 5] This is a top view to explain the monitoring range in a fire detection system according to embodiment 2 of the present disclosure, in which a first infrared camera performs normal detection, a second infrared camera performs fixed-point detection, and a third infrared camera is put to sleep. [Figure 6] This is a top view for explaining the monitoring range in a fire detection system according to embodiment 2 of the present disclosure, in which a fixed-point detection is performed by a first infrared camera, a normal detection is performed by a second infrared camera, and a third infrared camera is put to sleep. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0012] A preferred embodiment of the fire detection system of the present disclosure will be described below with reference to the drawings. The fire detection system of the present disclosure has a technical feature of suppressing false recognition of fire caused by sunlight by determining that a fire has occurred when two or more detection devices identify the same fire source position.

[0013] Embodiment 1 1 is an overall configuration diagram of a fire exploration system according to a first embodiment of the present disclosure. The fire exploration system shown in FIG. 1 is configured to include a plurality of exploration devices 10(1) to 10(N) (N is an integer of 2 or more) and a general controller 20.

[0014] The N detection devices 10(1)-10(N) are arranged to detect the fire source position within the fire monitoring range assigned to each of them in advance. The general controller 20 has a function of identifying the fire source position within the fire monitoring range from the detection results of each of the detection devices 10(1)-10(N).

[0015] Each of the N probe devices 10(1) to 10(N) has the same configuration. Therefore, when describing the common configuration, they will be referred to as a probe device 10 below. The probe device 10 is configured to include an individual controller 11, an infrared camera 12, and a drive mechanism 13 for moving the imaging area of ​​the infrared camera 12 and changing the imaging position.

[0016] The fire exploration system according to the present disclosure has a technical feature of suppressing erroneous recognition of a fire caused by sunlight by determining that a fire has occurred when the same fire source location is identified by two or more exploration devices 10. Therefore, each location within the fire monitoring range is covered by the ranges covered by at least two of the multiple exploration devices 10(1) to 10(N).

[0017] The infrared camera 12 has a function of acquiring detection information including temperature information and fire source position information corresponding to each of a plurality of pixels by capturing an image within the assigned range. The individual controller 11 executes a process of identifying the fire source position within the assigned range based on the detection information acquired by the infrared camera 12. Furthermore, when the individual controller 11 is able to identify the fire source position by the identification process, it outputs the identified fire source position data to the general controller 20. The drive mechanism 13 will be described later.

[0018] The general controller 20 identifies the location of the fire source based on the location data received from each of the individual controllers 11 in each of the detection devices 10.

[0019] Next, a specific example of the viewing angle of infrared camera 12 and a monitoring area associated with movement of infrared camera 12 using drive mechanism 13 will be described with reference to Fig. 2. Fig. 2 is an explanatory diagram of an instantaneous monitoring range AV in the vertical direction and an instantaneous monitoring range AH ​​in the horizontal direction of infrared camera 12 according to embodiment 1 of the present disclosure.

[0020] Here, the instantaneous vertical monitoring range AV corresponds to the viewing range in the vertical direction, i.e., the vertical viewing angle, when the infrared camera 12 is fixed. The specific example in the upper part of Fig. 2 illustrates a case where the vertical viewing angle is 37.0 degrees.

[0021] The instantaneous horizontal monitoring range AH ​​corresponds to the horizontal viewing range, i.e., the horizontal viewing angle, when the infrared camera 12 is fixed. The specific example in the lower part of Fig. 2 illustrates a case where the horizontal viewing angle is 50.0 degrees.

[0022] By performing fire detection using the infrared camera 12, which has an instantaneous viewing angle of 50.0 degrees horizontally and 37.0 degrees vertically, and positioning it at a total of 12 positions, for example, using the pan head of the drive mechanism 13, it is possible to realize fire monitoring over a wide monitoring area with just one unit.

[0023] (1) The camera head is fixed at -19.5 degrees from the horizontal and rotated horizontally to search for the fire source in four positions. (2) Next, fix the camera head elevation angle at -47.5° from the horizontal and rotate it horizontally to search for the fire source in four positions. (3) Next, fix the camera head elevation angle at -75.5° from the horizontal and rotate it horizontally to search for the fire source in four positions.

[0024] Next, a case where the location of a fire source is erroneously recognized by infrared camera 12 due to reflected sunlight will be described with reference to Fig. 3. Fig. 3 is an explanatory diagram comparing a case where fire source 1 is detected by two infrared cameras 12(1) and 12(2) with a case where reflected sunlight 2(1) and 2(2) that is a source of a false alarm and results in a non-fire alarm, in the first embodiment of the present disclosure.

[0025] More specifically, Fig. 3(A) illustrates a state in which one fire source 1 is detected by two infrared cameras 12(1) and 12(2). On the other hand, Fig. 3(B) illustrates a case in which the first infrared camera 12(1) detects reflected sunlight 2(1) as a cause of a false alarm, and the second infrared camera 12(2) detects reflected sunlight 2(2) as a cause of a false alarm. When reflected sunlight enters infrared camera 12, it may result in a detection result of about 500 degrees in some cases.

[0026] As shown in FIG. 3(A), when a fire source 1 occurs within the fire monitoring range, the first infrared camera 12(1) detects 4a (Xa, Ya) as position data for fire source position 4a, and the second infrared camera 12(2) detects 4b (Xb, Yb) as position data for fire source position 4b.

[0027] Here, the position data 4a (Xa, Ya) and the position data 4b (Xb, Yb) are the results of detecting a fire source 1 at the same position, and the position data 4a (Xa, Ya) and the position data 4b (Xb, Yb) are adjacent position data whose distance falls within a preset allowable range. In this disclosure, adjacent position data whose distance between two points falls within an allowable range is referred to as "same position" position data.

[0028] The allowable range of the distance between the two points is determined based on the accuracy of the detection of the fire source position. For example, if the detection accuracy is 2m, the allowable range is 5 times that, or 10m. Alternatively, it can be determined based on the accuracy of the water discharge action after the fire source is detected, or based on both the accuracy of the detection of the fire source position and the accuracy of the water discharge.

[0029] On the other hand, when there is an effect of reflected sunlight 2 within the fire monitoring range, it is considered that normally only one infrared camera 12 will detect the reflected light 2. Also, when two infrared cameras 12(1), 12(2) are both affected by reflected sunlight 2, as shown in Fig. 3(B), it is considered that the first infrared camera 12(1) will detect the reflected sunlight 2(1) reflected by the reflective material 3(1) as position data 5a(Xa, Ya), and the second infrared camera 12(2) will detect the reflected sunlight 2(2) reflected by the reflective material 3(2) as position data 5b(Xb, Yb).

[0030] In other words, it is rare for reflected sunlight 2 to be detected by two infrared cameras 12(1), 12(2). Even if it is detected by two infrared cameras 12(1), 12(2), the position data 5a (Xa, Ya) and position data 5b (Xb, Yb) will be detected as data outside the acceptable range, rather than nearby position data that falls within the acceptable range, due to the different reflective materials 3(1), 3(2).

[0031] Examples of reflective materials 3 include smartphones, metal handrails, and metal gates used at events.

[0032] Therefore, the overall controller 20 executes the process of identifying the fire source position in the following steps, thereby suppressing the erroneous recognition of a fire caused by sunlight and enabling the detection of the fire source 1 that should be detected with high accuracy.

[0033] Step S1: When the overall controller 20 acquires fire source position data from any one of the multiple detection devices 10, the overall controller 20 specifies the acquired fire source position data as a tentative fire source position. Note that, in order to simplify the explanation, the case where the fire source position data is acquired from the detection device 10(1) is explained as an example.

[0034] Step S2: The general controller 20 identifies other detection devices 10(2)-10(N) whose coverage area includes the tentative fire source location, from among the remaining detection devices 10(2)-10(N) other than the one detection device 10(1) that is the source of the fire source location data. Here, to simplify the explanation, a case where the fire source location data identified by the detection device 10(1) is included in the detection area of ​​the detection device 10(2) will be explained as an example. That is, the following explanation will be given assuming that the detection device 10(2) is identified as the other detection device.

[0035] Step S3: When the overall controller 20 acquires fire source position data corresponding to the same position as the tentative fire source position from the individual controller 11 corresponding to the detection device 10(2) identified as another detection device, it identifies the tentative fire source position as the fire source position within the fire monitoring range.

[0036] Step S4: On the other hand, if the overall controller 20 cannot acquire position data from the individual controller 11 corresponding to the detection device 10(2) identified as another detection device, or if the position data is acquired but is not the same position as the tentative fire source position, it determines that the detection device has been affected by a false alarm factor and does not identify the tentative fire source position as the fire source position within the fire monitoring range.

[0037] By executing a series of identification processes from step S1 to step S4, the general controller 20 can determine that a fire has occurred at the same fire source position when two or more detection devices 10 identify the same fire source position, and can suppress erroneous recognition of a fire caused by sunlight. As a result, unnecessary alarm operations or unnecessary water discharge operations can be suppressed, and the reliability of the fire detection system can be improved.

[0038] In the above-mentioned specific example, the method is described in which, after acquiring fire source position data from the detection device 10(1) as a tentative fire source position, the detection device 10(2) is identified as another detection device, and when fire source position data related to the same position as the tentative fire source position is acquired from the detection device 10(2), the tentative fire source position is identified as the fire source position within the fire monitoring range. However, the method of identifying the fire source position according to the present disclosure is not limited to this.

[0039] As another method, when fire source location data corresponding to the same fire source location is obtained from two or more detection devices within a certain period of time, the same fire source location can be identified as the fire source location within the fire monitoring range without identifying other detection devices 10(2).

[0040] Embodiment 2 In the second embodiment, a specific method for monitoring a fire on the ground of a dome baseball stadium using three infrared cameras 12(1) to 12(3) will be described in detail with reference to Figs. 4 to 6.

[0041] 4 is a top view illustrating the arrangement and monitoring range of three infrared cameras 12(1)-12(3) in a fire detection system according to embodiment 2 of the present disclosure. When a ground 100 of a dome baseball stadium is the target of fire monitoring, the three infrared cameras 12(1)-12(3) are arranged as follows, for example, as shown in FIG.

[0042] The first infrared camera 12(1) is installed on the third base side and performs fire detection over its coverage area Z(1) on the ground 100. The second infrared camera 12(2) is installed on the first base side and performs fire detection over its coverage area Z(2) on the ground 100. Furthermore, the third infrared camera 12(3) is installed on the center field side and performs fire detection over its coverage area Z(3) on the ground 100.

[0043] The three infrared cameras 12(1)-12(3) in each of the three detection devices 10(1)-10(3) are mounted on respective drive mechanisms 13 (not shown) and are positioned and controlled by respective individual controllers 11 so that the desired instantaneous horizontal monitoring range and desired instantaneous vertical monitoring range can be monitored.

[0044] For example, as described above in the first embodiment, each of the three infrared cameras 12(1) to 12(3) can cover its respective assigned ranges Z(1) to Z(3) by being moved to four positions at each of the three elevation and depression angles and being position-controlled to a total of 12 positions.

[0045] Here, the entire surface of the ground 100 is covered by the coverage areas Z1(1) to Z(3) of the three infrared cameras 12(1) to 12(3). The inside of the bench 101 on the first base side is covered by the coverage area Z(1) of the first infrared camera 12(1) and the coverage area Z(3) of the third infrared camera 12(3), and the inside of the bench 102 on the third base side is covered by the coverage area Z(2) of the second infrared camera 12(2) and the coverage area Z(3) of the third infrared camera 12(3).

[0046] In other words, if the entire surface of the ground 100, the area inside the bench 101 on the first base side, and the area inside the bench 101 on the third base side are set as the fire monitoring range, all positions within the fire monitoring range are covered by the areas covered by at least two of the three detection devices 10(1) to 10(3).

[0047] Each of the three detection devices 10(1) to 10(3) has the following three modes for detecting a fire. <Mode 1: Normal exploration> In the normal inspection in mode 1, fire inspection is performed in the assigned coverage area Z while controlling the positioning of the infrared camera 12 sequentially to desired positions.

[0048] <Mode 2: Fixed point exploration> In the fixed-point detection of mode 2, the infrared camera 12 is stopped at a desired position, and fire detection is continuously performed in a part of the assigned coverage area Z. As an example, the first infrared camera 12(1) shown in Fig. 4 can perform fire detection in the first base bench 101 continuously without moving after being positioned so that the entire first base bench 101 is included in the viewing angle by the fixed-point detection.

[0049] Similarly, the second infrared camera 12(2) shown in FIG. 4 can be positioned by fixed-point detection so that the entire third base bench 102 is included within its viewing angle, and then can continuously perform fire detection inside the third base bench 102 without moving.

[0050] <Mode 3: Pause> In the pause mode 3, the detection device 10 is paused and the detection process using the infrared camera 12 is stopped. This allows the individual controller 11, the infrared camera 12, and the drive mechanism 13 to rest, thereby extending the device life and saving energy.

[0051] A specific example of a monitoring process combining these three modes will be described with reference to Figures 5 and 6. Figure 5 is a top view for explaining a monitoring range in a fire detection system according to a second embodiment of the present disclosure, in which a first infrared camera 12(1) performs normal detection, a second infrared camera 12(2) performs fixed-point detection, and a third infrared camera 12(3) is paused.

[0052] 5, the first infrared camera 12(1) performs normal inspection to sequentially monitor all of the assigned coverage area Z(1). When the general controller 20 acquires fire source position data from the individual controller 11 in the first inspection device 10(1), the general controller 20 determines whether the position data is within the ground 100 or within the first base bench 101 within the coverage area Z(1) assigned to the first infrared camera 12(1), and identifies it as a tentative fire source position.

[0053] Then, if the identified tentative fire source location is within the ground 100, the overall controller 20 identifies the second exploration device 10(2) or the third exploration device Z(3) as the other exploration device 10, since the ground 100 is included in both the coverage area Z(2) and the coverage area Z(3).

[0054] On the other hand, if the identified tentative fire source location is within the first base bench 101, the overall controller 20 identifies the third detection device Z(3) as another detection device 10, since the first base bench 101 is included only in the coverage area Z(3).

[0055] Furthermore, the general controller 20 outputs an exploration command to the individual controllers 11 in the other identified exploration devices 10 to execute a fire exploration at the tentative fire source position.

[0056] The individual controllers 11 in the other detection devices 10 that have received the detection command move the infrared cameras 12 to a position including the tentative fire source position and perform fire detection. When the infrared cameras 12 detect a fire source, the individual controllers 11 respond to the general controller 20 with the fire source position data.

[0057] If the overall controller 20 determines that the fire source location data received from another detection device 10 in response to the detection command corresponds to the same location as the tentative fire source location, it identifies the tentative fire source location as the fire source location within the fire monitoring range.

[0058] On the other hand, if the overall controller 20 cannot receive fire source position data from the other detection devices 10 in response to the detection command, it determines that the tentative fire source position is a false report. Also, even if the overall controller 20 can receive fire source position data from the other detection devices 10 in response to the detection command, it also determines that the tentative fire source position is a false report if it determines that the received fire source position data is not the same position as the tentative fire source position.

[0059] Also, in FIG. 5, when the overall controller 20 acquires fire source position data from the individual controller 11 in the second detection device 10(2) that is performing fixed-point detection, the overall controller 20 determines whether the position data is within the ground 100 or within the third base bench 102 in the area being detected, and identifies it as a tentative fire source position.

[0060] Then, if the identified tentative fire source location is within the ground 100, the overall controller 20 identifies the first exploration device 10(2) or the third exploration device Z(3) as the other exploration device 10, since the ground 100 is included in both the coverage area Z(1) and the coverage area Z(3).

[0061] On the other hand, if the identified tentative fire source location is within the third base bench 102, the overall controller 20 identifies the third detection device Z(3) as another detection device 10, since the third base bench 102 is included only in the coverage area Z(3).

[0062] Furthermore, the general controller 20 outputs an exploration command to the individual controllers 11 in the other identified exploration devices 10 to execute a fire exploration at the tentative fire source position.

[0063] The individual controllers 11 in the other detection devices 10 that have received the detection command move the infrared cameras 12 to a position including the tentative fire source position and perform fire detection. When the infrared cameras 12 detect a fire source, the individual controllers 11 respond to the general controller 20 with the fire source position data.

[0064] If the overall controller 20 determines that the fire source location data received from another detection device 10 in response to the detection command corresponds to the same location as the tentative fire source location, it identifies the tentative fire source location as the fire source location within the fire monitoring range.

[0065] On the other hand, if the overall controller 20 cannot receive fire source position data from the other detection devices 10 in response to the detection command, it determines that the tentative fire source position is a false report. Even if the overall controller 20 can receive fire source position data from the other detection devices 10 in response to the detection command, if it determines that the received fire source position data is not the same position as the tentative fire source position, it determines that the tentative fire source position is a false report.

[0066] FIG. 6 is a top view illustrating the monitoring range in a fire detection system according to embodiment 2 of the present disclosure, in which a fixed-point detection is performed by a first infrared camera 12(1), a normal detection is performed by a second infrared camera 12(2), and a third infrared camera 12(3) is paused.

[0067] In the previous FIG. 5, the first infrared camera 12(1) was used to perform normal inspection, and the second infrared camera 12(2) was used to perform fixed-point inspection of the bench 102 on the third base side. In contrast, in FIG. 6, the second infrared camera 12(2) is used to perform normal inspection, and the first infrared camera 12(1) is used to perform fixed-point inspection of the bench 101 on the first base side. This is different from the previous FIG.

[0068] In other words, the only difference is the role of the first infrared camera 12(1) and the role of the second infrared camera 12(2). Since the basic operation for identifying the location of the fire source is the same, a detailed explanation of the operation in FIG. 6 will be omitted.

[0069] The general controller 20 can operate the fire detection system by alternately executing the detection operation shown in Fig. 5 and the detection operation shown in Fig. 6 at regular intervals. By performing such an operation, it is possible to realize a fire detection system that can reduce energy consumption, extend the device lifespan with a reduced operating rate, and suppress erroneous recognition of fires caused by sunlight, compared to a case in which all three detection devices 10(1) to 10(3) always perform normal detection.

[0070] Similarly, the third infrared camera 12(3) may be used to perform normal detection, while the first infrared camera 12(1) and the second infrared camera 12(2) are kept idle. In this case, the basic operation of identifying the fire source position is the same, so a detailed description of the operation will be omitted. [Explanation of symbols]

[0071] 1 fire source, 2 reflected light, 3 reflective material, 4a, 4b, 5a, 5b position data, 10 detection device, 11 individual controller, 12 infrared camera, 13 drive mechanism, 20 overall controller.

Claims

1. A plurality of detection devices are installed to detect the location of a fire source within each assigned area of ​​the fire monitoring range; a general controller for identifying a fire source position within the fire monitoring range based on the detection results of the plurality of detection devices; A fire detection system comprising: Each of the plurality of exploration devices is an infrared camera that captures an image of the area covered by the infrared camera and obtains detection information including temperature information and fire source position information corresponding to each of the pixels; an individual controller that executes a process for identifying a fire source position within the coverage area based on the detection information acquired by the infrared camera, and outputs position data of the identified fire source when the fire source position is identified by the process; having The fire monitoring range is covered by areas covered by at least two of the plurality of detection devices; When the general controller acquires position data of a fire source corresponding to the same position from at least two of the plurality of detection devices, the general controller identifies the position data of the fire source corresponding to the same position as the fire source position within the fire monitoring range. Fire detection systems.

2. When the general controller acquires the fire source position data from any one of the plurality of detection devices, the general controller specifies the acquired fire source position data as a tentative fire source position, and specifies other detection devices whose coverage areas include the tentative fire source position from among the remaining detection devices other than the one detection device, and when the general controller acquires fire source position data corresponding to the same position as the tentative fire source position from an individual controller corresponding to the other detection devices, the general controller specifies the tentative fire source position as the fire source position within the fire monitoring range. The fire detection system of claim 1 .

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