Optical cable polling detection device and system and optical cable polling detection method

Abstract

The invention relates to an optical cable polling detection device and system and an optical cable polling detection method. The optical cable polling detection device comprises a first detection unit which outputs detection light to carry out polling detection on all fiber cores in a group of fiber cores when no abnormity is detected; when an abnormality is detected, only the fiber core which detects an abnormal signal is detected; the second detection unit is used for outputting detection light to carry out polling detection on all fiber cores in the other group of fiber cores when the abnormity is not detected; when the abnormal signal is detected, only the fiber core in which the abnormal signal is detected is detected; the first detection unit is respectively connected with all the core fibers through the optical change-over switches, and the second detection unit is respectively connected with all the core fibers through the optical change-over switches; and the control part is connected with the first detection unit and the second detection unit for control, and the control part is respectively connected with the light change-over switch and controls the on-off of the light change-over switch.

Description

Technical Field

[0001] This invention relates to the technical field of safety monitoring in mines, and particularly to an optical fiber polling detection device, an optical fiber polling detection system, and an optical fiber polling detection method for mine rescue. Background Technology

[0002] In the past, mine safety monitoring often involved laying a single fiber optic cable. This method was simple but generally suitable for short-distance mine tunnels. When dealing with complex mine structures where multiple cables were used, the possibility of missed detections increased because each cable's fiber core was polled and tested repeatedly. Summary of the Invention

[0003] This invention provides an optical cable polling detection device, optical cable polling detection system, and optical cable polling detection method for optical cable inspection in complex mine structures, which can reduce the possibility of missed detections in cases where there are branched deployments.

[0004] In a first aspect, embodiments of the present invention provide an optical cable polling detection device for grouping and polling all fiber cores of an optical cable deployed in a mine, comprising: a first detection unit, which outputs detection light to poll all fiber cores in one group when no abnormality is detected; and outputs detection light only to detect the fiber cores for which an abnormal signal is detected when an abnormality is detected; a second detection unit, which outputs detection light to poll all fiber cores in another group when no abnormality is detected; and outputs detection light only to detect the fiber cores for which an abnormal signal is detected when an abnormal signal is detected; and a plurality of optical switching switches, wherein the first detection unit is connected via the optical switching switch. A switching switch is connected to each of the fiber cores. The second detection unit is connected to each of the fiber cores via the optical switching switch. When one of the first detection unit and the second detection unit detects a fiber core with an abnormal signal, the optical switching switch connected to the fiber core with the abnormal signal is kept in an on state. The other of the first detection unit and the second detection unit polls and detects all fiber cores without detected abnormal signals. A control unit is connected to the first detection unit and the second detection unit for control. The control unit is also connected to the optical switching switch and controls the optical switching switch to turn on and off.

[0005] In the aforementioned optical fiber polling device, when an abnormal signal is detected in a fiber core, the control unit controls the other of the first detection unit and the second detection unit to reduce the polling period for fiber cores within a predetermined range near the fiber core where the abnormal signal was detected, and to increase the polling period for fiber cores outside the predetermined range.

[0006] In a second aspect, embodiments of the present invention provide an optical cable polling detection system, wherein the optical cable polling detection device described in any of the preceding claims detects the fiber cores included in an optical cable splitting structure; and the optical cable splitting structure includes an input optical cable; a junction box; and a plurality of output optical cables, the junction box including: a first explosion-proof gland, through which the input optical cable passes and is split into a plurality of fiber cores; a fiber-to-core converter, which regroups the split fiber cores; and a second explosion-proof gland, through which the plurality of output optical cables composed of the grouped fiber cores respectively pass and extend to the outside of the junction box.

[0007] In the aforementioned optical fiber polling detection system, the fiber cores are connected one-to-one through fusion splicing.

[0008] In the aforementioned optical fiber polling detection system, the fiber cores are connected one-to-one via adapters.

[0009] In the aforementioned optical fiber polling detection system, at least the output optical fiber is installed on the cave wall 10cm to 120cm above the ground in the mine.

[0010] In a third aspect, embodiments of the present invention provide an optical cable polling detection method, comprising: a grouping step, dividing all fiber cores in the mine into two groups; a judgment step, judging whether there are any fiber cores with detected abnormalities; a detection step under normal conditions, wherein a first detection unit polls and detects the first group of fiber cores, and a second detection unit polls and detects the second group of fiber cores; and a detection step under abnormal conditions, wherein when one of the first detection unit and the second detection unit detects a fiber core with an abnormal signal, the detection device that detected the abnormal signal stops polling and detects the fiber core with the abnormal signal, and the other of the first detection unit and the second detection unit polls and detects all fiber cores for which no abnormal signal has been detected.

[0011] The above-mentioned optical cable polling detection method also includes a polling period adjustment step. When there is a fiber core with an abnormal signal, the polling period of the other of the first detection unit and the second detection unit for detecting fiber cores within a predetermined range near the optical cable where the abnormal signal was detected is reduced, and the polling period for detecting fiber cores outside the predetermined range is increased.

[0012] The optical cable polling detection device, optical cable polling detection system, and optical cable polling detection method provided by the present invention can reduce the possibility of missed detection when the optical cable is arranged in a branched manner. Attached Figure Description

[0013] To more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings used in the embodiments of the present invention will be briefly introduced below. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0014] Figure 1 A schematic diagram of an optical cable polling detection device according to an embodiment of the present invention is shown; Figure 2 This is a schematic diagram illustrating the structure of an optical cable splitter according to an embodiment of the present invention; Figure 3 This is a schematic diagram of the junction box wiring according to an embodiment of the present invention; Figure 4 This is a schematic diagram illustrating the optical cable configuration position according to an embodiment of the present invention; Figure 5 This is a flowchart illustrating an example of optical fiber polling according to an embodiment of the present invention; Figure 6 This is another flowchart illustrating an embodiment of optical cable polling according to the present invention; Figure 7 This is a schematic diagram showing the arrangement of an optical cable polling detection system according to an embodiment of the present invention. Detailed Implementation

[0015] The features and exemplary embodiments of various aspects of the present invention will now be described in detail. To make the objectives, technical solutions, and advantages of the present invention clearer, the present invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only configured to explain the present invention and are not configured to limit the present invention. For those skilled in the art, the present invention can be practiced without some of these specific details. The following description of the embodiments is merely intended to provide a better understanding of the present invention by illustrating examples of the invention.

[0016] It should be noted that, in this document, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Unless otherwise specified, an element defined by the phrase "comprising..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0017] In mines, optical cables used include grating cables, interference cables, and Rayleigh scattering-based cables. Grating cables utilize the fact that external sound waves or vibrations cause minute deformations in the grating, resulting in changes in the frequency, phase, and amplitude of the reflected light. By demodulating the corresponding parameters and using a sound reconstruction algorithm, the sound information of the environment at each grating point can be obtained. Interferometric Fiber Optic Sensing (IFOS) is a high-sensitivity sensing technology based on the interference effect of light and the sensing characteristics of optical cables. It converts sound wave or vibration signals into measurable optical signals, which are then demodulated to reconstruct the original sound wave information. Rayleigh scattering-based cables use a single ordinary optical cable as both a "sensing medium" and a "transmission medium." By detecting the coherent changes in the backscattered Rayleigh light within the cable, distributed, blind-spot-free monitoring of acoustic / vibration signals along the entire cable length is achieved.

[0018] This invention proposes a technical field for mine safety monitoring, particularly relating to an optical cable polling detection device, an optical cable polling detection system, and an optical cable polling detection method for mine rescue, which can reduce the possibility of missed detection when optical cables are deployed in a branched manner.

[0019] Figure 1This diagram illustrates a structural schematic of an optical cable polling detection device according to an embodiment of the present invention. An optical cable polling detection device 1 performs grouped polling detection on all fiber cores deployed in a mine shaft, comprising: a first detection unit 12, which outputs detection light to poll all fiber cores S1~Sm in one group when no abnormal signal is detected; and only detects the fiber cores for which the abnormal signal is detected when an abnormal signal is detected; a second detection unit 13, which outputs detection light to poll all fiber cores Sm+1~Sn in another group when no abnormal signal is detected; and only detects the fiber cores for which the abnormal signal is detected when an abnormal signal is detected; and multiple optical switching switches K11~K1n, K21~K2n, wherein the first detection unit 12 is connected to all fiber cores S1~Sn via the optical switching switches K11~K1n respectively, and the second detection unit 13... The detection unit 13 is connected to all fiber cores S1 to Sn via optical switching switches K21 to K2n. When one of the first detection unit 12 and the second detection unit 13 detects a fiber core with an abnormal signal, the optical switching switch connected to the fiber core with the abnormal signal is kept on. The other of the first detection unit 12 and the second detection unit 13 polls all fiber cores without detecting an abnormal signal. The unit 13 is connected to the first detection unit 12 and the second detection unit 13 for control. The control unit 11 is also connected to the optical switching switches K11 to K1n and K21 to K2n respectively, and controls the optical switching switches K11 to K1n and K21 to K2n to turn on and off.

[0020] Specifically, when deploying optical cables in mines, given the complex conditions, the cables are split to save on cable usage. The optical cable connected to the upper-level monitoring device contains multiple fiber cores. In the mine, the fiber cores are split using junction boxes according to the branching patterns. Based on the number of branching paths, the fiber cores in the input multi-core optical cable are redistributed and combined into multiple output optical cables; the output optical cables continue the original laying method, extending along different branching tunnels.

[0021] Figure 2 This is a schematic diagram illustrating the structure of an optical cable splitter according to an embodiment of the present invention. Figure 3This is a schematic diagram illustrating the junction box branching structure according to an embodiment of the present invention. The optical cable branching structure includes an input optical cable S; a junction box 20; and output optical cables S1' and S2'. The junction box 20 includes: a first explosion-proof gland 21, through which the input optical cable S passes and is split into multiple fiber cores Sk; a fiber-to-core converter 22, which regroups the split fiber cores Sk; and a second explosion-proof gland 23, through which the grouped fiber cores Sk form the output optical cables S1' and S2', respectively, extending to the outside of the junction box 20. Through the junction box 20 described above, a bundle of optical cables can be branched and recombined into several bundles of output optical cables. This facilitates flexible deployment of optical cables in mines.

[0022] When the fiber core length is insufficient, the fiber cores can be connected one-to-one by fusion splicing. This connection method permanently fixes the two fiber cores together, resulting in extremely low loss and high stability. Alternatively, when the fiber core length is insufficient, the fiber cores can also be connected one-to-one using an adapter, which is a more flexible method.

[0023] Figure 4 This is a schematic diagram illustrating the optical cable configuration location according to an embodiment of the present invention. The placement of the optical cable in a mine needs to consider the following factors. First, the safety of the optical cable in the event of a mine disaster. Second, the independence of the optical cable, meaning it should not be affected by other equipment and devices in the mine when no disaster occurs. Based on these factors, the optical cable is placed in a location near a wall in the mine where a collapse would easily form a triangular stable structure. Additionally, considering the potential for ground subsidence during a mine collapse, placing the cable too close to the ground could cause it to break. Therefore, the optical cable S is generally selected 30 cm from the mine wall, 10-120 cm from the ground. This arrangement maximizes the safety of the optical cable and avoids interference.

[0024] After the fiber optic cable is laid, ground personnel can monitor the underground situation through it. Ground-based detection devices use laser generators and other methods to emit light pulses to poll and detect the cable. Typically, a single detection device polls all fiber cores, but if an incident or other event is detected in a particular fiber core, the polling stops, while the core with the detected incident continues to be monitored to avoid missing distress calls or changes from underground personnel. However, this can lead to situations where other fiber cores cannot be detected.

[0025] This invention provides an optical cable polling detection device 1, which performs grouped polling detection on all fiber cores deployed in a mine tunnel. The device includes: a first detection unit 12, which outputs detection light to poll all fiber cores in one group when no abnormality is detected; and outputs detection light only on the fiber cores where the abnormal signal is detected when an abnormality is detected; a second detection unit 13, which outputs detection light to poll all fiber cores in another group when no abnormality is detected; and outputs detection light only on the fiber cores where the abnormal signal is detected when an abnormal signal is detected; and multiple optical switching switches K11~K1n, K21~K2n, where n is an integer greater than 1, and the first... A detection unit 12 is connected to all fiber cores via the optical switching switch, and a second detection unit 13 is connected to all fiber cores via the optical switching switch. When one of the first detection unit 12 and the second detection unit 13 detects a fiber core with an abnormal signal, the optical switching switch connected to the fiber core with the abnormal signal is kept in the conducting state. The other of the first detection unit 12 and the second detection unit 13 polls all optical cables that have not detected abnormal signals. A control unit 11 is connected to the first detection unit 12 and the second detection unit 13 for control, and the control unit 11 is also connected to the optical switching switch to control the optical switching switch to turn on and off.

[0026] Figure 1A schematic diagram of an optical fiber polling detection device according to an embodiment of the present invention is shown. The fiber cores are divided into two groups: one group consists of fiber cores S1~Sm, and the other group consists of fiber cores Sm+1~Sn, where n is an integer greater than 1, and m is an integer greater than or equal to 1 and less than or equal to n. A first detection unit 12 is connected to fiber cores S1~Sn via optical switching switches K11~K1n, and a second detection unit 13 is connected to fiber cores S1~Sn via optical switching switches K21~K2n. When no abnormality is detected in any fiber core, the first detection unit 12 only polls fiber cores S1~Sm, and the second detection unit 13 only polls fiber cores Sm+1~Sn. A control unit 11 is connected to the first detection unit 12, the second detection unit 13, and the optical switching switches K11~K1n and K21~K2n, and controls the on / off state of each optical switching switch. When an abnormality is detected in a fiber core, such as fiber core S1, the control unit 11 controls the optical switching switch K11 to remain on, causing the first detection unit 12 to stop polling and detecting fiber cores S1-Sm, and only detect the abnormal fiber core S1. This concentrates attention on the signals detected by the abnormal fiber core, avoiding the omission of distress signals, etc. At this time, for fiber cores S2-Sm, the control unit 11 controls the optical switching switches connected to fiber cores S1-Kn other than fiber core S1 to Sn to poll and detect fiber cores S2-Sn, instead of only polling and detecting fiber cores Sm+1-Sn. Similarly, when an anomaly is detected in, for example, fiber core Sm+1 in the second group of fiber cores, the control unit 11 controls the light switching switch K2m+1 to remain on, so that the second detection unit 13 only detects fiber core Sm+1, while the first detection unit polls and detects all fiber cores from S1 to Sn except for fiber core Sm+1. Furthermore, the control unit 11 also controls the detection cycle of the first and second detection units emitting detection light. With this setup, firstly, due to the grouping, the polling cycle for detecting each fiber core can be reduced, thus enabling better monitoring of the mine's conditions; secondly, when an anomaly is detected in a fiber core, not only can the detected anomaly be detected in real time, but other fiber cores can also be polled and detected, further reducing the possibility of missed detections.

[0027] Optionally, for example, when the first detection unit 12 detects an abnormal signal from a certain fiber core, the control unit controls the second detection unit 13 to reduce the polling cycle of fiber cores within a predetermined range near the fiber core from which the abnormal signal was detected, and to increase the polling cycle of fiber cores outside the predetermined range. For example, when fiber cores are numbered sequentially according to their geographical adjacency, the predetermined range can be a predetermined number of fiber cores closest to the fiber core from which the abnormal signal was detected, such as two fiber cores. Furthermore, when the mine is divided into multiple geographical areas, the predetermined range can be, for example, the area where the fiber core from which the abnormal signal was detected is located, and the polling cycle of all fiber cores within that area can be reduced. Moreover, based on a mine map, the predetermined range can also be fiber cores within a certain distance from the fiber core from which the abnormal signal was detected, such as fiber cores within 100m of the fiber core from which the abnormal signal was detected. Here, the "predetermined range" is not limited and can be set according to the specific circumstances of the mine and the accident.

[0028] Another aspect of the present invention relates to a method for optical cable polling detection. Figure 5 This is a flowchart illustrating an example of optical fiber polling according to an embodiment of the present invention. The optical fiber polling detection method includes the following steps. In the grouping step S11, all fiber cores in the mine are divided into two groups. In the judgment step S12, it is determined whether any fiber cores with abnormalities are detected. When no fiber cores with abnormalities are detected, the process proceeds to the normal detection step S13, where the first detection unit polls the first group of fiber cores, and the second detection unit polls the second group of fiber cores. When a fiber core with an abnormality is detected in step S12, the process proceeds to the abnormal signal detection step S14, where, when one of the first detection unit and the second detection unit detects a fiber core with an abnormal signal, the detection device that detected the abnormal signal stops polling but maintains detection of the fiber core with the abnormal signal, while the other of the first and second detection units polls all fiber cores for which no abnormal signal is detected.

[0029] Optionally, when one of the first detection unit and the second detection unit detects an abnormal fiber core, the other of the first detection unit and the second detection unit reduces the polling period for fiber cores within a predetermined range near the fiber core where the abnormal signal was detected, and increases the polling period for fiber cores outside the predetermined range. Figure 6 This is a flowchart illustrating yet another example of optical fiber polling according to an embodiment of the present invention. Steps S11~S14 and Figure 5Steps S11 and S14 are the same. The difference lies in the fact that, in the case where an abnormal fiber core is detected, a polling period adjustment step S15 is also included. When an abnormal signal is detected in a fiber core, control is performed so that the other of the first detection unit 12 and the second detection unit 13 reduces the polling period for optical cables within a predetermined range near the fiber core where the abnormal signal is detected, and increases the polling period for optical cables outside the predetermined range. This is because, in the event of an accident such as a mine collapse, the possibility of a collapse in nearby mines is also high. Therefore, more dense detection of fiber cores within a certain range near the fiber core where the abnormal signal is detected can further reduce the possibility of missed detections.

[0030] For other details and effects of the polling method, please refer to the optical cable polling detection device mentioned above; detailed explanations are omitted here.

[0031] Another aspect of the present invention relates to an optical cable polling detection system, comprising the aforementioned optical cable splitter structure, disposed in the mine shaft; and the aforementioned optical cable polling detection device for detecting the optical cable. Figure 7 This is a schematic diagram illustrating the layout of an optical cable polling detection system according to an embodiment of the present invention. The optical cable polling detection system includes an optical cable polling detection device 1 located on the ground, capable of communicating with a host server 100 via wired or wireless means. The optical cable S enters the underground via a mine entrance and can be arranged as described above with the optical cable distribution structure. The ground-based optical cable polling detection device 1 polls and detects the fiber cores contained in the underground optical cable S. The ground-based optical cable polling detection device 1 and the underground optical cable distribution structure together constitute the optical cable polling detection system. A detailed description of the optical cable polling detection device is omitted here.

[0032] It should be clarified that the present invention is not limited to the specific configurations and processes described above and shown in the figures. For the sake of brevity, detailed descriptions of known methods are omitted here. In the above embodiments, several specific steps are described and shown as examples. However, the method process of the present invention is not limited to the specific steps described and shown. Those skilled in the art can make various changes, modifications, and additions, or change the order of steps, after understanding the spirit of the present invention.

[0033] The above description is merely a specific embodiment of the present invention. It should be understood that the scope of protection of the present invention is not limited thereto. Any person skilled in the art can easily conceive of various equivalent modifications or substitutions within the technical scope disclosed in the present invention, and such modifications or substitutions should all be covered within the scope of protection of the present invention.

Claims

1. An optical cable polling and testing device, comprising: grouping and polling all fiber cores of an optical cable that is split and arranged in a mine shaft, including: The first detection unit outputs detection light to poll and detect all the fiber cores in a group of fiber cores when no abnormality is detected. When an anomaly is detected, the output detection light is only used to detect the fiber core where the abnormal signal was detected; The second detection unit outputs detection light to poll all fiber cores in another group when no abnormality is detected; when an abnormal signal is detected, the output detection light only detects the fiber core to which the abnormal signal was detected. Multiple optical switching switches are provided. The first detection unit is connected to all fiber cores via the optical switching switches, and the second detection unit is connected to all fiber cores via the optical switching switches. When one of the first detection unit and the second detection unit detects a fiber core with an abnormal signal, the optical switching switch connected to the fiber core with the abnormal signal is kept in the conducting state. The other of the first detection unit and the second detection unit polls and detects all fiber cores without detected abnormal signals. as well as The control unit is connected to the first detection unit and the second detection unit for control, and is also connected to the optical switching switch to control the optical switching switch to open and close.

2. The optical cable polling detection device as described in claim 1, wherein, When an abnormal signal is detected in a fiber core, the control unit controls the other of the first detection unit and the second detection unit to reduce the polling period for fiber cores within a predetermined range near the fiber core where the abnormal signal was detected, and to increase the polling period for fiber cores outside the predetermined range.

3. An optical fiber polling detection system, in ， The optical cable polling detection device according to claim 1 or 2 is used to detect the fiber cores contained in the optical cable splitting structure. as well as The optical cable branching structure is installed in the mine shaft, including an input optical cable; Junction box; And multiple output optical cables, The junction box includes: The first explosion-proof gland, after the input optical cable passes through the first explosion-proof gland, is split into multiple fiber cores; The core-fiber converter regroups the split fiber cores; and The second explosion-proof gland, through which the multiple output optical cables composed of the grouped fiber cores pass and extend to the outside of the junction box.

4. The optical cable polling detection system as described in claim 3, wherein, The fiber cores are connected one-to-one by welding.

5. The optical cable polling detection system as described in claim 3, wherein, The fiber cores are connected one-to-one via adapters.

6. The optical cable polling detection system as described in claim 3, wherein, At least the output optical cable is installed on the cave wall 10cm to 120cm above the ground in the mine.

7. A method for optical cable polling detection, comprising: The grouping step divides all the fiber cores in the mine into two groups; The judgment step is to determine whether there is an abnormal fiber core detected; The normal testing procedure is as follows: the first testing unit performs polling testing on the first group of fiber cores, and the second testing unit performs polling testing on the second group of fiber cores. as well as In the abnormal detection step, when one of the first detection unit and the second detection unit detects a fiber core with an abnormal signal, the detection device that detected the abnormal signal stops polling detection but continues to detect the fiber core with the abnormal signal, while the other of the first detection unit and the second detection unit polls detection on all fiber cores for which no abnormal signal has been detected.

8. The optical cable polling detection method as described in claim 7, It also includes a polling cycle adjustment step, in which, when an abnormal signal is detected in a fiber core, the polling cycle of the other of the first detection unit and the second detection unit for detecting fiber cores within a predetermined range near the fiber core with the detected abnormal signal is reduced, and the polling cycle for detecting fiber cores outside the predetermined range is increased.

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