CN104167073B - A kind of distributed fire protection warning and burning things which may cause a fire disaster localization method - Google Patents
A kind of distributed fire protection warning and burning things which may cause a fire disaster localization method Download PDFInfo
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Abstract
For the defect of existing fire prevention, the present invention provides a kind of distributed fire protection warning and burning things which may cause a fire disaster localization method.It is respectively provided with wireless fire fighting detector in each monitoring area, this wireless fire fighting detector includes wind direction and wind velocity sensor, Smoke Sensor, controller, sound and light alarm module, wireless communication module, for the Smoke Sensor of the fire decision threshold that surveyed smokescope value is preset beyond controller, controller generates warning message and is sent to alarm host machine.Alarm host machine, based on Gaussian plume model, is calculated each group of Smoke Sensor smokescope value sequence, it is determined that burning things which may cause a fire disaster position.Distributed fire protection warning that the present invention provides and burning things which may cause a fire disaster localization method, when carrying out large area fire-fighting monitoring, reduce monitoring cost, and realize accurately, report to the police rapidly, simultaneously can quick to fire location, be accurately positioned, it is simple to fire extinguishing and rescue work are carried out in time.
Description
Technical field
The present invention relates to fire protection warning and burning things which may cause a fire disaster positioning field, particularly relate to a kind of distributed fire protection warning and burning things which may cause a fire disaster localization method.
Background technology
Fire, as the origin of Development of Human Civilization, plays the effect that can not be substituted in human social development process.But when fire bring to human society bright with warm while, also bring many disasters.In particular with the development of modern society and making rapid progress of science and technology, disaster hidden-trouble also gets more and more, and the injury caused is the most increasing.The particularly frequent generation of fire disaster accident, to our society with great personnel and property loss.In China's early stage seventies, annual because the property loss that fire is caused is about 2.5 hundred million yuan.And after 2000, China is annual because the property loss that fire is caused is up to 20,000,000,000 yuan.The most effective monitoring fire becomes the field of society particularly scientific circles' primary study.
Fire protection alarm system miscellaneous also arises at the historic moment, and has been widely used for the every aspect of our life.But existing fire hazard monitoring system realize large area fire-fighting monitoring, report to the police time, lower deployment cost is high, and be difficult to accurate, report to the police rapidly.In addition, existing fire protection alarm system is often only capable of making alarm response with regard to fire, and position cannot be occurred to make burning things which may cause a fire disaster and be accurately positioned, thus makes troubles to the fire extinguishing in later stage and rescue work.
Summary of the invention
For the defect of existing fire prevention, the present invention provides a kind of distributed fire protection warning and burning things which may cause a fire disaster localization method.
This distributed fire protection warning and burning things which may cause a fire disaster localization method comprise the following steps, step 1) is respectively provided with wireless fire fighting detector in each monitoring area, this wireless fire fighting detector includes wind direction and wind velocity sensor, Smoke Sensor, controller, sound and light alarm module, wireless communication module, wherein wind direction and wind velocity sensor, Smoke Sensor, sound and light alarm module, wireless communication module is all connected with controller, wind direction and wind velocity sensor, Smoke Sensor detects the wind direction and wind velocity value at Smoke Sensor position and smokescope value respectively, Smoke Sensor for the fire decision threshold that surveyed smokescope value is preset beyond controller, controller generates warning message, warning message triggers sound and light alarm module and sends sound and light signal, warning message is sent to alarm host machine through radio network gateway by wireless communication module simultaneously.Step 2) alarm host machine will cause report to the police Smoke Sensor region and adjacent M Smoke Sensor region be set to burning things which may cause a fire disaster possibility distributed areas, smokescope value at its smoke detector place, wind direction and wind velocity value are sent the wireless fire fighting detector in possible for warning message broadcast to burning things which may cause a fire disaster distributed areas, the wireless fire fighting detector in the possible distributed areas of burning things which may cause a fire disaster to alarm host machine by radio network gateway by alarm host machine.Burning things which may cause a fire disaster may be carried out stress and strain model as an entirety in distributed areas by step 3) alarm host machine, it is divided into N number of grid altogether, the central point of n-th grid is arrived respectively as imagination fire location using first, when using the central point of first grid as imagination fire location, for M Smoke Sensor, according to the wind direction and wind velocity value at first grid element center point location coordinate, each Smoke Sensor position coordinates, each Smoke Sensor position, based on Gaussian plume model, it is calculated the smokescope value of each Smoke Sensor of first group；When continuing to calculate respectively using second to n-th grid element center point as imagination fire location, according to second to n-th grid element center point coordinates, the position coordinates of M Smoke Sensor, wind direction and wind velocity value, based on Gaussian plume model, it is calculated second respectively to the smokescope value of each Smoke Sensor of N group；The actual smokescope value that the common N group smokescope value of this M Smoke Sensor calculated and this M Smoke Sensor record being compared, one group of value of calculation that difference value is minimum, the grid of its correspondence is burning things which may cause a fire disaster position.
By technique scheme, in described step 3) when using the central point of first grid as imagination fire location, for first Smoke Sensor, according to the wind direction and wind velocity value at first grid element center point location coordinate, first Smoke Sensor position coordinates, first Smoke Sensor position, based on Gaussian plume model, it is calculated the smokescope value of first Smoke Sensor；Same method is used to calculate second smokescope value to m-th Smoke Sensor respectively.
By technique scheme, described alarm host machine may wireless fire fighting detector in distributed areas by warning message broadcast to burning things which may cause a fire disaster based on the agreement that floods.
Distributed fire protection warning that the present invention provides and burning things which may cause a fire disaster localization method, when carrying out large area fire-fighting monitoring, reduce monitoring cost, and realize accurately, report to the police rapidly, simultaneously can quick to fire location, be accurately positioned, it is simple to fire extinguishing and rescue work are carried out in time.
Accompanying drawing explanation
Fig. 1 is the structural representation of the device of the distributed fire protection warning of the embodiment of the present invention and burning things which may cause a fire disaster localization method；
Fig. 2 is the structural representation of wireless fire fighting detector in Fig. 1；
Fig. 3 is the distributed fire protection warning of the embodiment of the present invention and burning things which may cause a fire disaster localization method flow chart；
Fig. 4 is embodiment of the present invention monitoring area schematic diagram；
Fig. 5 is the distributed fire protection warning of the embodiment of the present invention and burning things which may cause a fire disaster localization method stress and strain model schematic diagram.
Detailed description of the invention
In order to make the purpose of the present invention, technical scheme and advantage clearer, below in conjunction with drawings and Examples, the present invention is further elaborated.Should be appreciated that specific embodiment described herein, only in order to explain the present invention, is not intended to limit the present invention.
The device that a kind of distributed fire protection warning of the embodiment of the present invention and burning things which may cause a fire disaster localization method are applied as it is shown in figure 1, this device includes, in each monitoring area arrange wireless fire fighting detector, radio network gateway, alarm host machine.As in figure 2 it is shown, wireless fire fighting detector includes wind direction and wind velocity sensor, Smoke Sensor, controller, sound and light alarm module, wireless communication module.Wherein wind direction and wind velocity sensor, Smoke Sensor are for detecting the smokescope value at Smoke Sensor position and wind direction and wind velocity value, wind direction and wind velocity sensor, Smoke Sensor are all connected with controller, Smoke Sensor for the fire decision threshold that surveyed smokescope value is preset beyond controller, controller generates warning message, and by coupled wireless communication module, by warning message through radio network gateway, it is sent to alarm host machine.Alarm host machine, for the Smoke Sensor region reported to the police and adjacent M Smoke Sensor region thereof being caused to be set to the possible distributed areas of burning things which may cause a fire disaster, alarm host machine may wireless fire fighting detector in distributed areas by warning message broadcast to burning things which may cause a fire disaster based on the agreement that floods, wireless fire fighting detector in the possible distributed areas of burning things which may cause a fire disaster sends the smokescope value at its smoke detector place, wind direction and wind velocity value to alarm host machine by radio network gateway, burning things which may cause a fire disaster may be carried out stress and strain model as an entirety in distributed areas by alarm host machine, is divided into N number of grid altogether.The central point of n-th grid is arrived respectively as imagination fire location using first, when using the central point of first grid as imagination fire location, for M Smoke Sensor, according to the wind direction and wind velocity value at first grid element center point location coordinate, each Smoke Sensor position coordinates, each Smoke Sensor position, based on Gaussian plume model, it is calculated the smokescope value of each Smoke Sensor of first group；When continuing to calculate respectively using second to n-th grid element center point as imagination fire location, according to second to n-th grid element center point coordinates, the position coordinates of M Smoke Sensor, wind direction and wind velocity value, based on Gaussian plume model, it is calculated second respectively to the smokescope value of each Smoke Sensor of N group, the actual smokescope value that the common N group smokescope value of this M Smoke Sensor calculated and this M Smoke Sensor record is compared, one group of value of calculation that difference value is minimum, the grid of its correspondence is burning things which may cause a fire disaster position.
Alarm host machine is when using the central point of first grid as imagination fire location, for first Smoke Sensor, according to the wind direction and wind velocity value at first grid element center point location coordinate, first Smoke Sensor position coordinates, first Smoke Sensor position, based on Gaussian plume model, it is calculated the smokescope value of first Smoke Sensor.Alarm host machine uses same method to calculate second smokescope value to m-th Smoke Sensor respectively.
In the present embodiment, as shown in Figure 4, for certain office space schematic diagram, totally 7 monitoring areas in this place, it is laid with 7 wireless fire fighting detector: D1 ~ D7 altogether.The most each wireless fire fighting detector position coordinates is known.
When having fire to occur in any region of 7 monitoring areas, such as D2 has fire to occur in region, wireless fire fighting detector D2 perception smokescope value exceeds fire decision threshold, and sends warning, but now wireless fire fighting detector D2 cannot determine burning things which may cause a fire disaster particular location.Alarm host machine is according to the position coordinates of wireless fire fighting detector D2, it is first determined burning things which may cause a fire disaster may distributed areas.
After receiving wireless fire fighting detector D2 institute alert, alarm host machine may distributed areas to burning things which may cause a fire disaster by warning message broadcast based on the agreement that floods.Then burning things which may cause a fire disaster may all wireless fire fighting detectors (D1 ~ D3) be after receiving warning message in distributed areas, and smokescope value at the smoke detector that will be collected, wind direction and wind velocity value, through wireless fire-fighting gateway, transmit to alarm host machine.As a example by wireless fire fighting detector D1, its smokescope value is Md1, wind direction and wind velocity value is respectively P d1 、Sd1.By that analogy, now actual smokescope array acquired in wireless fire fighting detector D1 ~ D3 is [Md1, Md2,Md3]。
Burning things which may cause a fire disaster may be carried out distributed areas stress and strain model, and the density degree of stress and strain model determines the precision of final burning things which may cause a fire disaster location algorithm.As it is shown in figure 5, in the present embodiment burning things which may cause a fire disaster may be divided into 18 grid: G1 ~ G18 in distributed areas.After completing stress and strain model, calculate and obtain grid element center position coordinates.As a example by grid G1, its grid element center position coordinates is (xg1, yg1)。
Determined grid element center point is respectively set as illusion burning things which may cause a fire disaster position, and according to the imaginary smokescope value of wireless fire fighting detector D1 ~ D3 position coordinate in the possible distributed areas of Gaussian plume model calculating burning things which may cause a fire disaster.As a example by grid G1, it is known that grid G1 center position coordinate (xg1, yg1), wireless fire fighting detector D1 position coordinates (xd1, yd1), wireless fire fighting detector D1 position wind direction and wind velocity value is respectively P d1 、Sd1.According to Gaussian plume model, can be calculated when fire location is grid G1 central point, imaginary smokescope value M of wireless fire fighting detector D1 positiong1,d1.Complete imaginary smokescope value M of detector D1 positiong1,d1After calculating, calculate illusion smokescope value M of wireless fire fighting detector D2, D3 respectivelyg2,d2、Mg3,d3, and thus form the imaginary smokescope value sequence [M of grid G1g1,d1, Mg2,d2,
Mg3,d3]。
According to the imaginary smokescope value sequence [M solving grid G1g1,d1, Mg2,d2, Mg3,d3] method, solve the imaginary smokescope value sequence of other grid element center (G2 ~ G18) respectively.By actual smokescope value array [M measured by each grid imagination smokescope value sequence and detector D1 ~ D3d1, Md2, Md3] compare, choose difference minimum one group, then the corresponding grid of this group is burning things which may cause a fire disaster position.
Described radio network gateway is connected by setting up with wireless fire fighting detector, obtains and comprises smokescope value, the warning message of wind direction and wind velocity value.Radio network gateway is connected with alarm host machine by RS485 data/address bus, and the warning message that wireless fire fighting detector is collected is forwarded to alarm host machine.
Described radio network gateway, both can be with wireless fire fighting detector node Direct Communication in device, it is possible to set up communication by the wireless fire fighting detector node of multi-hop mode Yu far-end in communication distance allowed band.
Sound and light alarm module includes buzzer, LED alarm lamp.When sound and light alarm module is triggered by controller, buzzer is in excited state, sends lasting high-decibel audible alarm.LED alarm lamp is high frequency flicker state.If controller judges to occur without fire, then sound and light alarm module is in a dormant state, and buzzer does not all respond with LED alarm lamp.
Distributed fire protection warning that the present invention provides and burning things which may cause a fire disaster localization method, when carrying out large area fire-fighting monitoring, reduce monitoring cost, and realize accurately, report to the police rapidly, simultaneously can quick to fire location, be accurately positioned, it is simple to fire extinguishing and rescue work are carried out in time.
As shown in Figure 3, the distributed fire protection warning of the embodiment of the present invention and burning things which may cause a fire disaster localization method comprise the following steps, it is respectively provided with wireless fire fighting detector in each monitoring area, this wireless fire fighting detector includes wind direction and wind velocity sensor, Smoke Sensor, controller, sound and light alarm module, wireless communication module, wherein wind direction and wind velocity sensor, Smoke Sensor is all connected with controller, Smoke Sensor for the fire decision threshold that surveyed smokescope value is preset beyond controller, controller generates warning message, and by coupled wireless communication module, by warning message through radio network gateway, it is sent to alarm host machine；Alarm host machine is set to the possible distributed areas of burning things which may cause a fire disaster by causing the Smoke Sensor region reported to the police and adjacent M Smoke Sensor region thereof, smokescope value at its smoke detector place, wind direction and wind velocity value are sent the wireless fire fighting detector in possible for warning message broadcast to burning things which may cause a fire disaster distributed areas, the wireless fire fighting detector in the possible distributed areas of burning things which may cause a fire disaster to alarm host machine by radio network gateway based on the agreement that floods by alarm host machine；Burning things which may cause a fire disaster may be carried out stress and strain model as an entirety in distributed areas by alarm host machine, it is divided into N number of grid altogether, the central point of n-th grid is arrived respectively as imagination fire location using first, when using the central point of first grid as imagination fire location, for M Smoke Sensor, according to the wind direction and wind velocity value at first grid element center point location coordinate, each Smoke Sensor position coordinates, each Smoke Sensor position, based on Gaussian plume model, it is calculated the smokescope value of each Smoke Sensor of first group；When continuing to calculate respectively using second to n-th grid element center point as imagination fire location, according to second to n-th grid element center point coordinates, the position coordinates of M Smoke Sensor, wind direction and wind velocity value, based on Gaussian plume model, it is calculated second respectively to the smokescope value of each Smoke Sensor of N group；The actual smokescope value that the common N group smokescope value of this M Smoke Sensor calculated and this M Smoke Sensor record being compared, one group of value of calculation that difference value is minimum, the grid of its correspondence is burning things which may cause a fire disaster position.
In the present embodiment, as shown in Figure 4, for certain office space schematic diagram, totally 7 monitoring areas in this place, it is laid with 7 wireless fire fighting detector: D1 ~ D7 altogether.The most each wireless fire fighting detector position coordinates is known.
When having fire to occur in any region of 7 monitoring areas, such as D2 has fire to occur in region, wireless fire fighting detector D2 perception smokescope value exceeds fire decision threshold, and sends warning, but now wireless fire fighting detector D2 cannot determine burning things which may cause a fire disaster particular location.Alarm host machine is according to the position coordinates of wireless fire fighting detector D2, it is first determined burning things which may cause a fire disaster may distributed areas.
After receiving wireless fire fighting detector D2 institute alert, alarm host machine may distributed areas to burning things which may cause a fire disaster by warning message broadcast based on the agreement that floods.Then burning things which may cause a fire disaster may all wireless fire fighting detectors (D1 ~ D3) be after receiving warning message in distributed areas, and smokescope value at the smoke detector that will be collected, wind direction and wind velocity value, through wireless fire-fighting gateway, transmit to alarm host machine.As a example by wireless fire fighting detector D1, its smokescope value is Md1, wind direction and wind velocity value is respectively P d1 、Sd1.By that analogy, now actual smokescope array acquired in wireless fire fighting detector D1 ~ D3 is [Md1, Md2,Md3]。
Burning things which may cause a fire disaster may be carried out distributed areas stress and strain model, and the density degree of stress and strain model determines the precision of final burning things which may cause a fire disaster location algorithm.As it is shown in figure 5, in the present embodiment burning things which may cause a fire disaster may be divided into 18 grid: G1 ~ G18 in distributed areas.After completing stress and strain model, calculate and obtain grid element center position coordinates.As a example by grid G1, its grid element center position coordinates is (xg1, yg1)。
Determined grid element center point is respectively set as illusion burning things which may cause a fire disaster position, and according to the imaginary smokescope value of wireless fire fighting detector D1 ~ D3 position coordinate in the possible distributed areas of Gaussian plume model calculating burning things which may cause a fire disaster.As a example by grid G1, it is known that grid G1 center position coordinate (xg1, yg1), wireless fire fighting detector D1 position coordinates (xd1, yd1), wireless fire fighting detector D1 position wind direction and wind velocity value is respectively P d1 、Sd1.According to Gaussian plume model, can be calculated when fire location is grid G1 central point, imaginary smokescope value M of wireless fire fighting detector D1 positiong1,d1.Complete imaginary smokescope value M of detector D1 positiong1,d1After calculating, calculate illusion smokescope value M of wireless fire fighting detector D2, D3 respectivelyg2,d2、Mg3,d3, and thus form the imaginary smokescope value sequence [M of grid G1g1,d1, Mg2,d2,
Mg3,d3]。
According to the imaginary smokescope value sequence [M solving grid G1g1,d1, Mg2,d2, Mg3,d3] method, solve the imaginary smokescope value sequence of other grid element center (G2 ~ G18) respectively.By actual smokescope value array [M measured by each grid imagination smokescope value sequence and detector D1 ~ D3d1, Md2, Md3] compare, choose difference minimum one group, then the corresponding grid of this group is burning things which may cause a fire disaster position.
Described radio network gateway is connected by setting up with wireless fire fighting detector, obtains and comprises smokescope value, the warning message of wind direction and wind velocity value.Radio network gateway is connected with alarm host machine by RS485 data/address bus, and the warning message that wireless fire fighting detector is collected is forwarded to alarm host machine.Described radio network gateway, both can be with wireless fire fighting detector node Direct Communication in device, it is possible to set up communication by the wireless fire fighting detector node of multi-hop mode Yu far-end in communication distance allowed band.
It should be appreciated that for those of ordinary skills, can be improved according to the above description or be converted, and all these modifications and variations all should be belonged to the protection domain of claims of the present invention.
Claims (3)
1. a distributed fire protection warning and burning things which may cause a fire disaster localization method, it is characterised in that the method comprises the following steps,
1) in each monitoring area, it is respectively provided with wireless fire fighting detector, this wireless fire fighting detector includes wind direction and wind velocity sensor, Smoke Sensor, controller, sound and light alarm module, wireless communication module, wherein wind direction and wind velocity sensor, Smoke Sensor, sound and light alarm module, wireless communication module is all connected with controller, wind direction and wind velocity sensor, Smoke Sensor detects the wind direction and wind velocity value at Smoke Sensor position and smokescope value respectively, Smoke Sensor for the fire decision threshold that surveyed smokescope value is preset beyond controller, controller generates warning message, warning message triggers sound and light alarm module and sends sound and light signal, warning message is sent to alarm host machine through radio network gateway by wireless communication module simultaneously；
2) alarm host machine will cause the Smoke Sensor region reported to the police and adjacent M Smoke Sensor region thereof to be set to the possible distributed areas of burning things which may cause a fire disaster, smokescope value at its smoke detector place, wind direction and wind velocity value are sent the wireless fire fighting detector in possible for warning message broadcast to burning things which may cause a fire disaster distributed areas, the wireless fire fighting detector in the possible distributed areas of burning things which may cause a fire disaster to alarm host machine by radio network gateway by alarm host machine；
3) burning things which may cause a fire disaster may be carried out stress and strain model as an entirety in distributed areas by alarm host machine, it is divided into N number of grid altogether, the central point of n-th grid is arrived respectively as imagination fire location using first, when using the central point of first grid as imagination fire location, for M Smoke Sensor, according to the wind direction and wind velocity value at first grid element center point location coordinate, each Smoke Sensor position coordinates, each Smoke Sensor position, based on Gaussian plume model, it is calculated the smokescope value of each Smoke Sensor of first group；When continuing to calculate respectively using second to n-th grid element center point as imagination fire location, according to second to n-th grid element center point coordinates, the position coordinates of M Smoke Sensor, wind direction and wind velocity value, based on Gaussian plume model, it is calculated second respectively to the smokescope value of each Smoke Sensor of N group；The actual smokescope value that the common N group smokescope value of this M Smoke Sensor calculated and this M Smoke Sensor record being compared, one group of value of calculation that difference value is minimum, the grid of its correspondence is burning things which may cause a fire disaster position.
Distributed fire protection warning the most according to claim 1 and burning things which may cause a fire disaster localization method, it is characterized in that, in described step 3) when using the central point of first grid as imagination fire location, for first Smoke Sensor, according to the wind direction and wind velocity value at first grid element center point location coordinate, first Smoke Sensor position coordinates, first Smoke Sensor position, based on Gaussian plume model, it is calculated the smokescope value of first Smoke Sensor；Same method is used to calculate second smokescope value to m-th Smoke Sensor respectively.
Distributed fire protection warning the most according to claim 1 and burning things which may cause a fire disaster localization method, it is characterised in that described alarm host machine may wireless fire fighting detector in distributed areas by warning message broadcast to burning things which may cause a fire disaster based on the agreement that floods.
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| CN106156917A (en) * | 2015-04-07 | 2016-11-23 | 中国联合网络通信有限公司广州市分公司 | Management of fire safety information system based on grid-based management mode |
| CN105404266B (en) * | 2015-12-16 | 2019-05-07 | 北京煜邦电力技术股份有限公司 | A kind of method and device of monitoring area |
| CN109686042A (en) * | 2018-12-29 | 2019-04-26 | 南通中远船务有限公司 | A kind of visualization fire alarm and relief auxiliary system |
| CN112001828B (en) * | 2020-08-04 | 2023-10-17 | 北京金源智控科技股份有限公司 | GIS-based intelligent rural gridding fire control management method, system and electronic equipment |
| CN112426644A (en) * | 2020-11-24 | 2021-03-02 | 江苏赛愽智能制造研究院有限公司 | Forest fire prevention monitoring robot control system and operation method thereof |
| CN114360194B (en) * | 2022-01-18 | 2024-06-04 | 广东新成科技实业有限公司 | Multi-point monitoring visual array type fire alarm system |
| CN114627607B (en) * | 2022-01-30 | 2022-11-29 | 江苏蓝图消防装备有限公司 | Fire-fighting comprehensive information retrieval system based on industrial sensor network |
| CN116403381B (en) * | 2023-06-08 | 2023-09-01 | 光交澳(上海)智能科技有限公司 | Smoke monitoring method and device, and smoke alarm method and system |
| CN117975647A (en) * | 2024-01-30 | 2024-05-03 | 营口天成消防设备有限公司 | Fire alarm system and method for large-space multi-area |
| CN117991710B (en) * | 2024-04-07 | 2024-05-28 | 广州帝能云科技股份有限公司 | Intelligent air-borne method and system with smoke alarm |
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| KR20100009690A (en) * | 2008-07-21 | 2010-01-29 | 에스시스템(주) | The apparatus and method of fire sensing by fire logic program |
| CN201820329U (en) * | 2010-10-28 | 2011-05-04 | 重庆市科学技术研究院 | System for monitoring, preventing and controlling forest fire |
| CN203084868U (en) * | 2013-03-21 | 2013-07-24 | 东北林业大学 | Forest fire prevention monitoring device |
| CN203204769U (en) * | 2013-04-24 | 2013-09-18 | 无锡市崇安区科技创业服务中心 | Fire monitoring and alarm system based on Internet of Things |
| CN203276452U (en) * | 2013-05-09 | 2013-11-06 | 黎宁茹 | A fireproof online monitoring system |
| CN103514700A (en) * | 2013-09-29 | 2014-01-15 | 柳州市宏亿科技有限公司 | Method for designing forest fire prevention early warning system |
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