Fiber bragg grating temperature measurement automatic fire alarm system

Abstract

The utility model relates to a fiber bragg grating temperature measurement fire automatic alarm system, which relates to the field of fire detection technology, and comprises a fiber bragg grating fire detection link, a transmission optical cable, a signal processor and a fire alarm host, the fiber bragg grating fire detection link is formed by connecting a plurality of fiber bragg grating detectors with different reflection wavelengths in series through a multi-core optical cable, and the distance between any two fiber bragg grating detectors is the same; the transmission optical cable is connected in series between the fiber bragg grating fire detection link and the signal processor; the signal output end of the signal processor is in signal connection with the signal input end of the fire alarm host, and the fire alarm host receives a plurality of demodulation signals and outputs an alarm signal when the temperature rising speed of any fiber grating detector exceeds a set value. The method can quickly give an alarm in the early stage of a fire, and improves the reliability of tunnel fire monitoring.

Description

Technical Field

[0001] The present application relates to the field of fire detection technology, and in particular to an automatic fire alarm system using fiber grating temperature measurement. Background Art

[0002] In recent years, with the development of my country's transportation modernization, the total mileage of highway and urban traffic tunnels has been rapidly extended, and the record of extra-long highway tunnels has been constantly refreshed, which will bring great challenges to the fire safety of tunnels. The hazards caused by traffic tunnel fire accidents at home and abroad have caused all countries to attach great importance to the issue of tunnel fire safety. Most of the fires that occur in tunnels are open fires, which carry thick smoke and have a thermal radiation rate of several megawatts, and can form a fire within minutes. According to fire simulation test studies (including road vehicles and subway trains), a fire usually forms completely in 8-10 minutes. When there is a fuel leak and a pit / pool is formed, the fire can form within 1-3 minutes.

[0003] In the prior art, multiple temperature monitors are often installed on the top inner wall of the tunnel at set length intervals. The signal output ends of the multiple temperature monitors are connected to a signal processor, and the signal output end of the signal processor is connected to the signal of the sound and light alarm in the monitoring room. It is mainly a fixed temperature alarm. When the temperature monitor detects that the temperature reaches the set temperature, the signal processor controls the sound and light alarm to emit a warning sound and flash.

[0004] However, common temperature monitors cannot quickly sound an alarm in the early stages of a fire, and cannot quickly locate the fire site, and have low reliability, leaving room for improvement. Utility Model Content

[0005] In order to quickly give an alarm in the early stage of a fire and improve the reliability of tunnel fire monitoring, the present application provides a fiber grating temperature measurement fire automatic alarm system.

[0006] The present application provides a fiber Bragg grating temperature measurement fire automatic alarm system adopts the following technical solution:

[0007] A fiber Bragg grating temperature measurement fire automatic alarm system, comprising a fiber Bragg grating fire detection link, a transmission optical cable, a signal processor and a fire alarm host, wherein the fiber Bragg grating fire detection link is fixedly installed on the dome of a tunnel, and the fiber Bragg grating fire detection link is composed of a plurality of fiber Bragg grating detectors with different reflection wavelengths connected in series via a multi-core optical cable, and the distance between any two of the fiber Bragg grating detectors is the same;

[0008] The transmission optical cable is laid along the cable trench at the bottom of the tunnel side, and the transmission optical cable is connected in series between the fiber Bragg grating fire detection link and the signal processor, and the signal processor outputs demodulation signals corresponding to the plurality of fiber Bragg grating detectors;

[0009] The signal output terminal of the signal processor is signal-connected to the signal input terminal of the fire alarm host, and the fire alarm host receives a number of the demodulated signals and outputs an alarm signal when the temperature rise rate at any of the fiber grating detectors exceeds a set value;

[0010] A plurality of sound and light alarms are fixedly installed on the inner wall of the tunnel at set intervals, the plurality of sound and light alarms correspond one-to-one with the plurality of fiber grating detectors, and the signal input ends of the plurality of sound and light alarms are signal-connected with the signal output ends of the fire alarm host.

[0011] By adopting the above technical solution, in the actual monitoring process, several fiber grating detectors in the tunnel sense the temperature of various places in the tunnel in real time and transmit it to the signal processor through the transmission optical cable. The signal processor demodulates the wavelength of the reflected light of the fiber grating sensor and outputs a digital signal. After calculation by the fire alarm host, the temperature rise rate of various places in the tunnel can be calculated; when a fire occurs somewhere in the tunnel, the fire alarm host can quickly locate the position of the fiber grating detector with the fastest temperature rise, and the corresponding sound and light alarm will send out warning sounds and flashes, which is convenient for firefighters to quickly locate the fire site and implement subsequent fire extinguishing measures. Compared with the tunnel fire monitoring technology of fixed temperature alarm, judging the occurrence of fire by the temperature rise rate can timely prevent the fire from getting bigger and causing greater losses, which can effectively improve the accuracy and reliability of tunnel fire monitoring.

[0012] Preferably, a plurality of Z-shaped brackets are fixedly mounted on the dome of the tunnel, and the plurality of Z-shaped brackets are arranged at intervals of a set length;

[0013] Steel wire ropes are fixedly installed on a plurality of the Z-shaped brackets, optical cable hanging rings are fixedly connected to a plurality of the steel wire ropes, and the multi-core optical cable is fixedly installed on the steel wire ropes through the plurality of optical cable hanging rings.

[0014] By adopting the above technical solution, the steel wire rope for installing the multi-core optical cable can be pre-fixed on the dome inside the tunnel through the Z-shaped bracket. Subsequently, the multi-core optical cable can be fixed to the dome of the tunnel through the lifting ring on the steel wire rope, so that the multi-core optical cable can be stably fixed and the use of the Z-shaped bracket can be reduced.

[0015] Preferably, a plurality of fiber optic fusion packages are serially connected on the multi-core optical cable, and the fiber optic fusion packages lead out two single-mode optical fibers in the multi-core optical cable, and the two single-mode optical fibers are respectively connected to two adjacent fiber grating detectors.

[0016] By adopting the above technical solution, a single-mode optical fiber can be led out through the optical fiber fuse package to connect the optical fiber Bragg grating detector, which can effectively reduce the number of optical fiber fuse packages used.

[0017] Preferably, an optical fiber splicing box is arranged in series between the multi-core optical cable and the transmission optical cable.

[0018] By adopting the above technical solution, the optical fiber splicing box can provide conditions for optical cable splicing and branching and protect the joints.

[0019] Preferably, a plurality of manual alarm buttons are fixedly installed on the inner wall of the tunnel, and the plurality of manual alarm buttons are arranged in the tunnel at intervals of a set length, and the signal output ends of the plurality of manual alarm buttons are signal-connected to the signal output end of the fire alarm host.

[0020] By adopting the above technical solution, the manual alarm button can be convenient for patrol personnel to issue an alarm through the manual alarm button when they find a fire in the tunnel and the fire is relatively small.

[0021] Preferably, a plurality of cameras are fixedly installed on the inner wall of the tunnel at set intervals, the signal input ends of the plurality of fill lights and the plurality of cameras are signal-connected to the signal output end of the fire alarm host, and the plurality of cameras are data-connected to the display in the control room.

[0022] By adopting the above technical solution, when a fire occurs in the tunnel and relevant personnel locate the fire location through the fire alarm host, relevant personnel can collect video data of the fire location by controlling the camera near the fire location, which is convenient for relevant personnel to analyze the fire situation.

[0023] In summary, the fiber Bragg grating temperature measurement fire automatic alarm system of the present application has at least one of the following beneficial technical effects:

[0024] 1. In the actual monitoring process, several fiber grating detectors in the tunnel sense the temperature of various places in the tunnel in real time and transmit it to the signal processor through the transmission optical cable. The signal processor demodulates the wavelength of the reflected light of the fiber grating sensor and outputs a digital signal. After calculation by the fire alarm host, the temperature rise rate of various places in the tunnel can be calculated; when a fire occurs somewhere in the tunnel, the fire alarm host can quickly locate the position of the fiber grating detector with the fastest temperature rise, and the corresponding sound and light alarm will send out warning sounds and flashes, so that firefighters can quickly locate the fire site and implement subsequent fire extinguishing measures; compared with the tunnel fire monitoring technology of fixed temperature alarm, judging the occurrence of fire by the temperature rise rate can timely prevent the fire from getting bigger and causing greater losses, which can effectively improve the accuracy and reliability of tunnel fire monitoring;

[0025] 2. The steel wire rope used to install the multi-core optical cable can be pre-fixed on the dome inside the tunnel through the Z-shaped bracket. Subsequently, the multi-core optical cable can be fixed to the dome of the tunnel through the lifting ring on the steel wire rope, so that the multi-core optical cable can be stably fixed and the use of the Z-shaped bracket can be reduced. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 It is a schematic diagram of an embodiment of the present application for illustrating the overall structure of an automatic fire alarm system.

[0027] Figure 2 It is a schematic diagram used to illustrate the installation position of the Z-shaped bracket in an embodiment of the present application.

[0028] Figure 3 It is a schematic diagram of an embodiment of the present application for demonstrating the installation position of a fiber Bragg grating fire detection link.

[0029] Explanation of the reference numerals in the accompanying drawings: 1. Fiber Bragg grating fire detection link; 11. Fiber Bragg grating detector; 12. Multi-core optical cable; 13. Fiber fuse package; 14. Single-mode optical fiber; 2. Transmission optical cable; 3. Signal processor; 4. Fire alarm host; 5. Tunnel; 51. Cable trench; 52. Z-shaped bracket; 53. Wire rope; 54. Optical cable lifting ring; 6. Sound and light alarm; 7. Fiber optic splicing box; 8. Manual alarm button; 9. Camera. DETAILED DESCRIPTION

[0030] The following is combined with Figure 1-3 This application is described in further detail.

[0031] Example

[0032] The present application embodiment discloses a fiber Bragg grating temperature measurement fire automatic alarm system. Figure 1-Figure 3 It mainly includes a fiber grating fire detection link 1, a transmission optical cable 2, a signal processor 3 and a fire alarm host 4. The fiber grating fire detection link 1 is fixedly installed on the dome of a tunnel 5. The fiber grating fire detection link 1 is composed of a number of fiber grating detectors 11 with different reflection wavelengths connected in series via a multi-core optical cable 12, and the distance between any two fiber grating detectors 11 is the same.

[0033] The transmission optical cable 2 is laid along the cable trench 51 at the bottom of the side of the tunnel 5 , and is connected in series between the fiber Bragg grating fire detection link 1 and the signal processor 3 , which outputs demodulation signals corresponding to a plurality of fiber Bragg grating detectors 11 .

[0034] The signal output terminal of the signal processor 3 is signal-connected to the signal input terminal of the fire alarm host 4. The fire alarm host 4 receives a number of demodulated signals and outputs an alarm signal when the temperature rise rate at any fiber grating detector 11 exceeds a set value.

[0035] A plurality of sound and light alarms 6 are fixedly installed on the inner wall of the tunnel 5 at set intervals, the plurality of sound and light alarms 6 correspond one to one with a plurality of fiber grating detectors 11, and the signal input ends of the plurality of sound and light alarms 6 are connected to the signal output ends of the fire alarm host 4.

[0036] In the actual monitoring process, a number of fiber grating detectors 11 in the tunnel 5 sense the temperature at various locations in the tunnel 5 in real time and transmit the temperature to the signal processor 3 through the transmission optical cable 2. The signal processor 3 demodulates the wavelength of the reflected light from the fiber grating sensor and outputs a digital signal. After calculation by the fire alarm host 4, the temperature rise rate at various locations in the tunnel 5 can be calculated. When a fire occurs somewhere in the tunnel 5, the position of the fiber grating detector 11 with the fastest temperature rise can be quickly located through the fire alarm host 4, and a warning sound and flash can be emitted through the corresponding sound and light alarm 6, so that firefighters can quickly locate the fire site and implement subsequent fire extinguishing measures.

[0037] Compared with the Tunnel 5 fire monitoring technology with fixed temperature alarm, judging the occurrence of fire by the temperature rise rate can timely prevent the fire from growing and causing greater losses, and can effectively improve the accuracy and reliability of Tunnel 5 fire monitoring.

[0038] Reference Figure 2 and Figure 3 A plurality of Z-shaped brackets 52 are fixedly installed on the dome of the tunnel 5, and the plurality of Z-shaped brackets 52 are arranged at intervals of a set length; steel wire ropes 53 are fixedly installed on the plurality of Z-shaped brackets 52, and optical cable rings 54 are fixedly connected to the plurality of steel wire ropes 53, and the multi-core optical cable 12 is fixedly installed on the steel wire ropes 53 through the plurality of optical cable rings 54.

[0039] The steel wire rope 53 for installing the multi-core optical cable 12 can be pre-fixed on the dome inside the tunnel 5 through the Z-shaped bracket 52. Subsequently, the multi-core optical cable 12 can be fixed to the dome of the tunnel 5 through the lifting ring on the steel wire rope 53, so that the multi-core optical cable 12 can be stably fixed and the usage of the Z-shaped bracket 52 can be reduced.

[0040] A plurality of fiber fusion packages are connected in series on the multi-core optical cable 12. Referring to the figure, the fiber fusion package leads out two single-mode optical fibers 14 in the multi-core optical cable 12, and the two single-mode optical fibers 14 are connected to two adjacent fiber grating detectors 11 respectively.

[0041] The single-mode optical fiber 14 can be led out through the optical fiber fuse package 13 to connect to the optical fiber Bragg grating detector 11 , which can effectively reduce the number of optical fiber fuse packages 13 used.

[0042] Reference Figure 1An optical fiber splicing box 7 is provided in series between the multi-core optical cable 12 and the transmission optical cable 2. The optical fiber splicing box 7 can provide conditions for optical cable splicing and branching and protect the joint.

[0043] Reference Figure 1 and Figure 3 A plurality of manual alarm buttons 8 are fixedly installed on the inner wall of the tunnel 5 , and the plurality of manual alarm buttons 8 are arranged in the tunnel 5 at intervals of a set length, and the signal output ends of the plurality of manual alarm buttons 8 are connected to the signal output ends of the fire alarm host 4 .

[0044] The manual alarm button 8 can be used by the patrol personnel to issue an alarm through the manual alarm button 8 when they find a fire in the tunnel 5 and the fire is relatively small.

[0045] It should be noted that in the embodiments of the present application, Figure 3 A plurality of cameras 9 are fixedly installed on the inner wall of the tunnel 5 at set intervals by screws, the signal input ends of the plurality of cameras 9 are connected to the signal output ends of the fire alarm host 4, and the plurality of cameras 9 are connected to the display data in the control room.

[0046] When a fire occurs in the tunnel 5 and relevant personnel locate the fire location through the fire alarm host, the relevant personnel can collect video data of the fire location by controlling the camera 9 near the fire location, so as to facilitate the relevant personnel to analyze the fire situation.

[0047] The implementation principle of the fiber Bragg grating temperature measurement fire automatic alarm system of the present application embodiment is as follows: in the actual monitoring process, a number of fiber Bragg grating detectors 11 in the tunnel 5 sense the temperature of various places in the tunnel 5 in real time and transmit it to the signal processor 3 through the transmission optical cable 2. The signal processor 3 demodulates the wavelength of the reflected light of the fiber Bragg grating sensor and outputs a digital signal. After the fire alarm host 4 calculates it, the temperature rise rate of various places in the tunnel 5 can be calculated; when a fire occurs somewhere in the tunnel 5, the position of the fiber Bragg grating detector 11 with the fastest temperature rise can be quickly located through the fire alarm host 4, and the corresponding sound and light alarm 6 can emit a warning sound and flash, so that firefighters can quickly locate the fire site and implement subsequent fire extinguishing measures. Compared with the tunnel 5 fire monitoring technology with fixed temperature alarm, judging the occurrence of fire by the temperature rise rate can timely prevent the fire from becoming larger and causing greater losses, and can effectively improve the accuracy and reliability of tunnel 5 fire monitoring.

[0048] The above are all preferred embodiments of the present application, and the protection scope of the present application is not limited thereto. Therefore, any equivalent changes made according to the structure, shape, and principle of the present application should be included in the protection scope of the present application.

Claims

1. A fiber Bragg grating temperature measurement fire automatic alarm system, characterized in that: The invention comprises a fiber Bragg grating fire detection link (1), a transmission optical cable (2), a signal processor (3) and a fire alarm host (4), wherein the fiber Bragg grating fire detection link (1) is fixedly installed on the dome of a tunnel (5), and the fiber Bragg grating fire detection link (1) is composed of a plurality of fiber Bragg grating detectors (11) with different reflection wavelengths connected in series via a multi-core optical cable (12), and the distance between any two of the fiber Bragg grating detectors (11) is the same; The transmission optical cable (2) is laid along a cable trench (51) at the bottom of the side of the tunnel (5), and the transmission optical cable (2) is connected in series between the fiber Bragg grating fire detection link (1) and a signal processor (3), and the signal processor (3) outputs demodulation signals corresponding to a plurality of the fiber Bragg grating detectors (11); The signal output end of the signal processor (3) is signal-connected to the signal input end of the fire alarm host (4); the fire alarm host (4) receives a number of the demodulated signals and outputs an alarm signal when the temperature rise rate at any of the fiber grating detectors (11) exceeds a set value; A plurality of sound and light alarms (6) are fixedly installed on the inner wall of the tunnel (5) at set intervals, the plurality of sound and light alarms (6) correspond to the plurality of fiber optic grating detectors (11) one by one, and the signal input ends of the plurality of sound and light alarms (6) are signal-connected to the signal output ends of the fire alarm host (4).

2. The fiber Bragg grating temperature measurement fire automatic alarm system according to claim 1, characterized in that: A plurality of Z-shaped brackets (52) are fixedly mounted on the dome of the tunnel (5), and the plurality of Z-shaped brackets (52) are arranged at intervals according to a set length; Steel wire ropes (53) are fixedly mounted on a plurality of the Z-shaped brackets (52), optical cable hanging rings (54) are fixedly connected to a plurality of the steel wire ropes (53), and the multi-core optical cable (12) is fixedly mounted on the steel wire ropes (53) via the plurality of optical cable hanging rings (54).

3. The fiber Bragg grating temperature measurement fire automatic alarm system according to claim 2 is characterized in that: A plurality of optical fiber fusion packages are connected in series on the multi-core optical cable (12), and the optical fiber fusion packages lead out two single-mode optical fibers (14) in the multi-core optical cable (12), and the two single-mode optical fibers (14) are respectively connected to two adjacent optical fiber grating detectors (11).

4. The fiber Bragg grating temperature measurement fire automatic alarm system according to claim 1, characterized in that: An optical fiber splicing box (7) is arranged in series between the multi-core optical cable (12) and the transmission optical cable (2).

5. The fiber Bragg grating temperature measurement fire automatic alarm system according to claim 1, characterized in that: A plurality of manual alarm buttons (8) are fixedly mounted on the inner wall of the tunnel (5), the plurality of manual alarm buttons (8) are arranged in the tunnel (5) at intervals of a set length, and the signal output ends of the plurality of manual alarm buttons (8) are signal-connected to the signal output end of the fire alarm host (4).

6. The fiber Bragg grating temperature measurement fire automatic alarm system according to claim 1, characterized in that: A plurality of cameras (9) are fixedly installed on the inner wall of the tunnel (5) at set intervals, the signal input ends of the plurality of cameras (9) are signal-connected to the signal output ends of the fire alarm host (4), and the plurality of cameras (9) are data-connected to the display in the control room.

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