CN103606240B - Adopt the method that distributed optical fiber temperature transducer system carries out fire alarm - Google Patents

Abstract

The present invention relates to a kind of method adopting distributed optical fiber temperature transducer system to carry out fire alarm, utilize distributed optical fiber temperature transducer system that the temperature of each monitoring point is acquired, the temperature data group gathered is carried out differential temperature respectively and processes step, space rolling average step, deducting the end makes an uproar and processes step and make an uproar and process the differential temperature background data that obtains of step to deducting the end and carry out the step of space rolling average, final acquisition is with reference to differential temperature data set, and then by comparing with reference to the high alarm setting value of data in differential temperature data set with setting, so that it is determined that be enough warnings.For there is the in the case of of warning, it is also possible to utilize warning positioning step to carry out fire and the determination of point occurs.Method in the present invention when defining relatively low high alarm setting value, can reduce rate of false alarm, too increase the sensitivity of fire alarm under the environment having air speed influence, it addition, when there being fire alarm, can position fire scene accurately simultaneously.

Description

Adopt the method that distributed optical fiber temperature transducer system carries out fire alarm

Technical field

The present invention relates to a kind of method adopting distributed optical fiber temperature transducer system to carry out fire alarm.

Background technology

In Highway Tunnel Construction, particularly in long tunnel engineering, fire hazard monitoring is most important to the safety of the normal pass of highway, vehicle, and due to reasons such as vehicle traveling, air pressure in vcehicular tunnel, generally longitudinal wind speed is bigger, directly affect the monitoring to fire, increase the difficulty of fire alarm location.

Distributed optical fiber temperature transducer system (DTS) is based on the principle of optical time domain reflection (OTDR) technology of advanced person and the Raman Back Scattering temperature effects of optical fiber, with optical fiber for carrier, combined by main frame, sensing optic cable and other adnexaes, be a kind of new and high technology for monitor in real time temperature field that developed recently gets up in the world.In current Highway Tunnel Construction, more selection distributed optical fiber temperature transducer system (DTS) carries out fire hazard monitoring.

Distributed optical fiber temperature transducer system (DTS) judges fire alarm, is generally adopted temperature upper limit and reports to the police, and general temperature rise rate is reported to the police.In distributed optical fiber temperature transducer system (DTS), the temperature of monitoring is linear differential data, is discrete temperature point by continuous print signal value difference processing on optical cable, general 0.5 to 1 meter of monitoring point.So-called temperature upper limit is reported to the police, and namely the optical cable raw temperature data collected carrying out, whether maximum judges higher than the constant temperature higher limit of definition；And general temperature rise rate warning is on raw temperature data basis, calculates the temperature rise rate (i.e. the temperature value of change per second) of every, then this value judges whether to be higher than the temperature rise higher limit of definition.Under high wind speed fire condition, the scope acted on optical fiber due to the condition of a fire is bigger, it is generally 4～10 meters, and skewness, so that original temperature data acquisition and temperature rise rate value of calculation noise are relatively big, thus fire alarm cannot be judged rapidly, and positioning precision is poor, if what higher limit defined is relatively low, then rate of false alarm is higher.Therefore, existing distributed optical fiber temperature sensor (DTS) judges that fire alarm, simple employing temperature upper limit judge to report to the police, in a lot of actual environment situations, particularly high wind speed, owing to noise is bigger, often cannot send alarm in time, alarm-free situation even occurs.And the temperature data gathered is not carried out denoising by general temperature rise rate alarm method, and it is made directly space rolling average, is not suitable for the situation of the temperaturing lifting abnormality of long envelope scope under high wind speed.If reduction high alarm setting, rate of false alarm is then higher, increases high alarm setting, then report to the police and slowly even do not report to the police.

Summary of the invention

To be solved by this invention primarily technical problem is that provides a kind of method adopting distributed optical fiber temperature transducer system to carry out fire alarm for above-mentioned prior art, even if fire also can accurately be reported to the police by the method under having air speed influence.

The present invention to be solved technical problem is that further provides a kind of method adopting distributed optical fiber temperature transducer system to carry out fire alarm for above-mentioned prior art, and the method can more be accurately positioned fire scene when breaking out of fire is reported to the police.

This invention address that the technical scheme that above-mentioned primary technical problem adopts is: a kind of method adopting distributed optical fiber temperature transducer system to carry out fire alarm, comprise the steps:

Step one, high alarm setting value T is set_u；

The temperature data group that the m+n+1 group that step 2, intercepting distributed optical fiber temperature transducer system gather is connected, in chronological sequence order is designated as T₁[1,2,3 ... p], T₂[1,2,3 ... p] ... T_m+n[1,2,3 ... p], T_m+n+1[1,2,3 ... p], wherein T_m+n+1[1,2,3 ... p] it is the temperature data group that in the temperature data group intercepted, the time is up-to-date, p is the optical cable of distributed optical fiber temperature transducer system total number of the actual monitoring point measuring temperature, T in spatial domain_a[b] represents the measurement temperature at b place, 1≤a≤m+n+1,1≤b≤p in a group temperature data group；N is time n group temperature data group the earliest in the temperature data group intercepted herein, and this n group temperature data group is called historical temperature data group, and m is then up-to-date temperature data group T_m+n+1[1,2,3 ... p] and historical temperature data group between minimum interval group number；

Step 3, according to up-to-date temperature data group T_m+n+1[1,2,3 ... p] Temperature numerical that records, calculate the differential temperature data of each monitoring point of optical cable, calculation is as follows:

Δ T is differential temperature data set herein, its data set being made up of p differential temperature numerical value；

Step 4, each differential temperature numerical value in Δ T is carried out the first space rolling average process, obtain differential temperature background data groupThe distance that wherein the first space rolling average processes is d₁, d₁For odd number, then:

$\stackrel{\‾}{\mathrm{\ΔT}\left[b\right]}=\stackrel{\‾}{\mathrm{\ΔT}\left[\frac{d_1+1}{2}\right]},$ Wherein $1\≤b\≤\frac{d_1-1}{2};$

$\stackrel{\‾}{\mathrm{\ΔT}\left[b\right]}=\frac{\mathrm{\ΔT}[b-\frac{d_1-1}{2}]+\mathrm{\ΔT}[b-\frac{d_1-1}{2}+1]+...\mathrm{\ΔT}\left[b\right]+\mathrm{\ΔT}[b+1]+...+\mathrm{\ΔT}[b+\frac{d_1-1}{2}]}{d_1},$ Wherein $\frac{d_1+1}{2}\≤b\≤p-\frac{d_1+1}{2};$

$\stackrel{\‾}{\mathrm{\ΔT}\left[b\right]}=\stackrel{\‾}{\mathrm{\ΔT}[p-\frac{d_1+1}{2}]},$ Wherein $p-\frac{d_1-1}{2}\≤b\≤p;$

Namely existTime, differential temperature background data groupIn each numerical value be: differential temperature value, Δ T [b] corresponding in differential temperature data set Δ T, front plus Δ T [b]Individual differential temperature numerical value, after adding Δ T [b]The meansigma methods of individual differential temperature numerical value, whereinRepresent differential temperature background data groupIn the differential temperature numerical value at b place, in this step calculating process, if the numerical value number before or after Δ T [b] is not enoughIndividual, namelyOrTime, thenNumerical value byOrReplace；

Step 5, for each monitoring point on optical cable, orderD be deduct the end make an uproar after differential temperature data set；

Step 6, to deduct the end make an uproar after differential temperature data set D in each numerical value carry out second space rolling average process, obtain final reference differential temperature data set Δ D, wherein second space rolling average process distance be d₂, d₂For odd number, then:

$\mathrm{\ΔD}\left[b\right]=\mathrm{\ΔD}\left[\frac{d_2+1}{2}\right],$ Wherein $1\≤b\≤\frac{d_2-1}{2};$

$\mathrm{\ΔD}\left[b\right]=\frac{D[b-\frac{d_2-1}{2}]+D[b-\frac{d_2-1}{2}+1]+...D\left[b\right]+D[b+1]+...+D[b+\frac{d_2-1}{2}]}{d_2},$ Wherein $\frac{d_2+1}{2}\≤b\≤p-\frac{d_2+1}{2};$

$\mathrm{\ΔD}\left[b\right]=\mathrm{\ΔD}[p-\frac{d_2+1}{2}],$ Wherein $p-\frac{d_2-1}{2}\≤b\≤p;$

Namely existTime, with reference to each numerical value in differential temperature data set Δ D be: deduct the end make an uproar after differential temperature data set D in corresponding deduct the end make an uproar after differential temperature numerical value D [b], front plus D [b]Individual deduct the end make an uproar after differential temperature numerical value, after adding D [b]Individual deduct the end make an uproar after the meansigma methods of differential temperature numerical value, wherein Δ D [b] represents the differential temperature numerical value at b place in the differential temperature data set D after deducting the end makes an uproar, 1≤b≤p, in this step calculating process, if the numerical value number deficiency before or after D [b]Individual, namelyOrTime, thenNumerical value byOrReplace；

Numerical value in step 7, the final reference differential temperature data set Δ D that step 6 is obtained and high alarm setting value T_uCarry out contrast to judge, if Δ D having a numerical value more than high alarm setting value T_u, then corresponding monitoring point is carried out fire alarm.

In described step 7, following several types can be divided into process respectively according to the temperature data acquisition interval difference of distributed optical fiber temperature transducer system:

When the temperature data acquisition interval of distributed optical fiber temperature transducer system is more than 8 seconds: the numerical value in the final reference differential temperature data set Δ D directly step 6 obtained and high alarm setting value T_uCarry out contrast to judge, if Δ D having a numerical value more than high alarm setting value T_u, then corresponding monitoring point is carried out fire alarm；

If the temperature data acquisition interval of distributed optical fiber temperature transducer system is 3～8 seconds: the mode according to step 2～step 6, Continuous plus two is with reference to differential temperature data set Δ D, 2/3rds weights are accounted for by new reference differential temperature data set Δ D, old reference differential temperature data set Δ D accounts for 1/3rd weights, it is weighted average, obtain Δ D1, by the numerical value in Δ D1 and high alarm setting value T_uCarry out contrast to judge, if the reference differential temperature data set after weighted average has a numerical value more than high alarm setting value T_u, then corresponding monitoring point is carried out fire alarm；

If the temperature data acquisition interval of distributed optical fiber temperature transducer system was less than 3 seconds: the mode according to step 2～step 6, Continuous plus three is with reference to differential temperature data set Δ D, and these three is averaged with reference to differential temperature data set, obtain Δ D2, then Δ D2 will have a numerical value more than high alarm setting value T_u, then corresponding monitoring point is carried out fire alarm.

This invention address that the technical scheme that above-mentioned further technical problem adopts is: in order to determine the position of alarm point more accurately, fire scene is accurately positioned, based on the above method, also includes:

If step 8 fire alarm, further determining that the particular location of point occurs actual fire, the defining method of actual fire generation point is:

If the fire Alarm Call Point sequence number that step 7 obtains is p, calculate this left side, control point with reference to the long-pending A of differential temperature data surface_L, calculate on the right of this control point with reference to the long-pending A of differential temperature data surface_R, wherein A_LIt is multiplied by corresponding sequence number number sum, A less than the reference differential temperature data of the correspondence numerical value more than zero in all monitoring points of p point sequence number for sequence number_RIt is multiplied by corresponding sequence number number sum more than the reference differential temperature data of the correspondence numerical value more than zero in all monitoring points of p point sequence number for sequence number, set correction factor μ, correction factor μ is one and depends on the actually used property parameters adopting distributed optical fiber temperature transducer system, and this property parameters can be calculated by fixed point experiment；Then the position of actual fire generation point is

P=p+(A_L-A_R)·μ。

Preferably, 7≤n≤48,1≤m≤9,511≤d₁≤ 1001,11≤d₂≤21。

Compared with prior art, it is an advantage of the current invention that: a kind of method adopting distributed optical fiber temperature transducer system to carry out fire alarm in the present invention, temperature data is carried out differential temperature process, again differential temperature data are carried out space rolling average, obtain differential temperature background data, on this basis, differential temperature data and differential temperature background data are carried out process obtain deduct the end make an uproar after differential temperature data, then through to deduct the end make an uproar after differential temperature data carry out space rolling average, thus finally giving differential temperature reference data, to gather temperature data carry out processed as above after, substantially increase the signal to noise ratio of temperature data.Contrast simple temperature upper limit to report to the police or temperature rise rate warning, can when defining relatively low high alarm setting value, reduce rate of false alarm, too increase the sensitivity of fire alarm under the environment having air speed influence simultaneously, be adapted under the environment of the high wind speed such as highway, tunnel and carry out fire alarm judgement.Method for calculating and locating when being additionally additionally included in fire alarm in the present invention, to fire scene so that the location of fire scene is more accurate.

Accompanying drawing explanation

Fig. 1 is the flow chart of the method that employing distributed optical fiber temperature transducer system carries out fire alarm in the embodiment of the present invention.

Detailed description of the invention

Below in conjunction with accompanying drawing embodiment, the present invention is described in further detail.

As it is shown in figure 1, a kind of method adopting distributed optical fiber temperature transducer system to carry out fire alarm, comprise the steps:

Step one, high alarm setting value T is set_u；

The temperature data group that the m+n+1 group that step 2, intercepting distributed optical fiber temperature transducer system gather is connected, in chronological sequence order is designated as T₁[1,2,3 ... p], T₂[1,2,3 ... p] ... T_m+n[1,2,3 ... p], T_m+n+1[1,2,3 ... p], wherein T_m+n+1[1,2,3 ... p] it is the temperature data group that in the temperature data group intercepted, the time is up-to-date, p is the optical cable of distributed optical fiber temperature transducer system total number of the actual monitoring point measuring temperature, T in spatial domain_a[b] represents the measurement temperature at b place, 1≤a≤m+n+1+1,1≤b≤p, 7≤n≤48,1≤m≤9 in a group temperature data group；N is time n group temperature data group the earliest in the temperature data group intercepted herein, and this n group temperature data group is called historical temperature data group, and m is then up-to-date temperature data group T_m+n+1[1,2,3 ... p] and historical temperature data group between minimum interval group number；

Step 3, according to up-to-date temperature data group T_m+n+1[1,2,3 ... p] Temperature numerical that records, calculate the differential temperature data of each monitoring point of optical cable, calculation is as follows:

Δ T is differential temperature data set herein, its data set being made up of p differential temperature numerical value, and Δ T [b] represents the differential temperature numerical value at b place, 1≤b≤p in differential temperature background data group Δ T；

This step is that example makes an explanation with m=2, n=7, p=3, then namely m+n+1=10 intercepts 10 groups of continuous print temperature data groups, according to time order and function order respectively T₁[1,2,3], T₂[1,2,3] ... T₉[1,2,3], T₁₀[1,2,3], wherein T₁₀[1,2,3] is the temperature data group that in the temperature data group intercepted, the time is up-to-date.The temperature data group respectively T then adopted when calculating current differential temperature data set₁₀[1,2,3], T₇[1,2,3], T₆[1,2,3], T₅[1,2,3] ... T₂[1,2,3], T₁[1,2,3], its each array is respectively as follows:

T₁₀[1,2,3]=[25.1,25.8,26.71]；

T₇[1,2,3]=[23.33,22.3,28.2]；

T₆[1,2,3]=[21.44,23.15,26.88]；

T₅[1,2,3]=[27.03,24.7,29.0]；

T₄[1,2,3]=[20.5,28.12,28.65]；

T₃[1,2,3]=[24.9,21.6,27.34]；

T₂[1,2,3]=[22.8,22.8,29.22]；

T₁[1,2,3]=[20.3,23.0,27.89]；

Then the single-point temperature difference data of current 1st monitoring point are:

Δ T [1]=25.1-(23.33+21.44+27.03+20.5+24.9+22.8+20.3)/7=2.2；

The single-point temperature difference data of current 2nd, the 3rd monitoring point are calculated respectively in the same way, then Δ T [2]=2.13, Δ T [3]=-1.46, thus can obtain differential temperature data set Δ T=[2.2,2.13 ,-1.46]；

In actual application, when when the temperature data group first fit 10 groups gathered, this requires, method provided by the invention then immediately begins to be suitable for；

Step 4, each differential temperature numerical value in Δ T is carried out the first space rolling average process, obtain differential temperature background data groupThe distance that wherein the first space rolling average processes is 511≤d₁≤ 1001, with d₁=511, p=2000 is example, then:

$\stackrel{\‾}{\mathrm{\ΔT}\left[b\right]}=\stackrel{\‾}{\mathrm{\ΔT}\left[256\right]},$ Wherein 1≤b≤255；

$\stackrel{\‾}{\mathrm{\ΔT}\left[b\right]}=\frac{\mathrm{\ΔT}[b-255]+\mathrm{\ΔT}[b-254]+...\mathrm{\ΔT}\left[b\right]+\mathrm{\ΔT}[b+1]+\mathrm{\ΔT}[b+2]+...+\mathrm{\ΔT}[b+255]}{d_1}$ , 256≤b≤1744；

$\stackrel{\‾}{\mathrm{\ΔT}\left[b\right]}=\stackrel{\‾}{\mathrm{\ΔT}\left[1744\right]},$ Wherein 1745≤b≤p；

Namely existTime, differential temperature background data groupIn each numerical value be: differential temperature value, Δ T [b] corresponding in differential temperature data set Δ T, front plus Δ T [b]Individual differential temperature numerical value, after adding Δ T [b]The meansigma methods of individual differential temperature numerical value, whereinRepresent differential temperature background data groupIn the differential temperature numerical value at b place, in this step calculating process, if the numerical value number before or after Δ T [b] is not enoughIndividual, namelyOrTime, thenNumerical value byOrReplace；

Step 5, for each monitoring point on optical cable, orderD be deduct the end make an uproar after differential temperature data set；

Step 6, to deduct the end make an uproar after differential temperature data set D in each numerical value carry out second space rolling average process, obtain final reference differential temperature data set Δ D, wherein second space rolling average process distance 11≤d₂≤ 21, with d₂=15, p=100 is example, then:

Δ D [b]=Δ D [8], wherein 1≤b≤7；

$\mathrm{\ΔD}\left[b\right]=\frac{D[b-7]+D[b-6]+...D\left[b\right]+D[b+1]+D[b+2]+...+D[6+7]}{d_2},$ 8≤b≤92；

Δ D [b]=Δ D [92], wherein 93≤b≤100；

Namely existTime, with reference to each numerical value in differential temperature data set Δ D be: deduct the end make an uproar after differential temperature data set D in corresponding deduct the end make an uproar after differential temperature numerical value D [b], front plus D [b]Individual deduct the end make an uproar after differential temperature numerical value, after adding D [b]Individual deduct the end make an uproar after the meansigma methods of differential temperature numerical value, wherein Δ D [b] represents the differential temperature numerical value at b place in the differential temperature data set D after deducting the end makes an uproar, 1≤b≤p, in this step calculating process, if the numerical value number deficiency before or after D [b]Individual, namelyOrTime, thenNumerical value byOrReplace；

Numerical value in step 7, the final reference differential temperature data set Δ D that step 6 is obtained and high alarm setting value T_uCarry out contrast to judge, if Δ D having a numerical value more than high alarm setting value T_u, then corresponding monitoring point is carried out fire alarm.

In described step 7, following several types can be divided into process respectively according to the temperature data acquisition interval difference of distributed optical fiber temperature transducer system:

When the temperature data acquisition interval of distributed optical fiber temperature transducer system is 10 seconds: the numerical value in the final reference differential temperature data set Δ D directly step 6 obtained and high alarm setting value T_uCarry out contrast to judge, if Δ D having a numerical value more than high alarm setting value T_u, then corresponding monitoring point is carried out fire alarm；

If the temperature data acquisition interval of distributed optical fiber temperature transducer system is 5 seconds: the mode according to step 2～step 6, Continuous plus two is with reference to differential temperature data set Δ D, 2/3rds weights are accounted for by new reference differential temperature data set Δ D, old reference differential temperature data set Δ D accounts for 1/3rd weights, it is weighted average, obtain Δ D1, by the numerical value in Δ D1 and high alarm setting value T_uCarry out contrast to judge, if the reference differential temperature data set after weighted average has a numerical value more than high alarm setting value T_u, then corresponding monitoring point is carried out fire alarm；

If the temperature data acquisition interval of distributed optical fiber temperature transducer system is 2.5 seconds: the mode according to step 2～step 6, Continuous plus three is with reference to differential temperature data set Δ D, and these three is averaged with reference to differential temperature data set, obtain Δ D2, then Δ D2 will have a numerical value more than high alarm setting value T_u, then corresponding monitoring point is carried out fire alarm.

In order to determine the position of alarm point more accurately, fire scene being accurately positioned, the method also includes:

If step 8 fire alarm, further determining that the particular location of point occurs actual fire, the defining method of actual fire generation point is:

If the fire Alarm Call Point sequence number that step 7 obtains is p, sequence number here is control point and is arranged in the position of array, is typically in an optical cable, arranges a control point at interval of 1 meter, if one day long be the optical cable of 1000 meters, then have 1000 control points；Calculate this left side, control point with reference to the long-pending A of differential temperature data surface_L, calculate on the right of this control point with reference to the long-pending A of differential temperature data surface_R, wherein A_LIt is multiplied by corresponding sequence number number sum, A less than the reference differential temperature data of the correspondence numerical value more than zero in all monitoring points of p point sequence number for sequence number_RIt is multiplied by corresponding sequence number number sum more than the reference differential temperature data of the correspondence numerical value more than zero in all monitoring points of p point sequence number for sequence number, set correction factor μ, correction factor μ is one and depends on the actually used property parameters adopting distributed optical fiber temperature transducer system, and this property parameters can be calculated by fixed point experiment；Then the position of actual fire generation point is

P=p+(A_L-A_R)·μ。

Claims (4)

1. one kind adopts the method that distributed optical fiber temperature transducer system carries out fire alarm, it is characterised in that: comprise the steps:

Step one, high alarm setting value T is set_u；

The temperature data group that the m+n+1 group that step 2, intercepting distributed optical fiber temperature transducer system gather is connected, in chronological sequence order is designated as T₁[1,2,3 ... p], T₂[1,2,3 ... p] ... T_m+n[1,2,3 ... p], T_m+n+1[1,2,3 ... p], wherein T_m+n+1[1,2,3 ... p] it is the temperature data group that in the temperature data group intercepted, the time is up-to-date, p is the optical cable of distributed optical fiber temperature transducer system total number of the actual monitoring point measuring temperature, T in spatial domain_a[b] represents the measurement temperature at b place, 1≤a≤m+n+1,1≤b≤p in a group temperature data group；N is time n group temperature data group the earliest in the temperature data group intercepted herein, and this n group temperature data group is called historical temperature data group, and m is then up-to-date temperature data group T_m+n+1[1,2,3 ... p] and historical temperature data group between minimum interval group number；

Step 3, according to up-to-date temperature data group T_m+n+1[1,2,3 ... p] Temperature numerical that records, calculate the differential temperature data of each monitoring point of optical cable, calculation is as follows:

Δ T is differential temperature data set herein, its data set being made up of p differential temperature numerical value；

Step 4, each differential temperature numerical value in Δ T is carried out the first space rolling average process, obtain differential temperature background data groupThe distance that wherein the first space rolling average processes is d₁, d₁For odd number, then:

$\stackrel{\‾}{\mathrm{\Δ}T\[b\]}=\stackrel{\‾}{\mathrm{\Δ}T\[\frac{d_1+1}{2}\]},$ Wherein $1\≤b\≤\frac{d_1-1}{2};$

$\begin{array}{c}\stackrel{\‾}{\mathrm{\Δ}T\[b\]}=\frac{\mathrm{\Δ}T\[b-\frac{d_1-1}{2}\]+\mathrm{\Δ}T\[b-\frac{d_1-1}{2}+1\]+...\mathrm{\Δ}T\[b\]+\mathrm{\Δ}T\[b+1\]+...+\mathrm{\Δ}T\[b+\frac{d_1-1}{2}\]}{d_1},\\ \frac{d_1+1}{2}\≤b\≤p-\frac{d_1+1}{2};\end{array}$

$\stackrel{\‾}{\mathrm{\Δ}T\[b\]}=\stackrel{\‾}{\mathrm{\Δ}T\[p-\frac{d_1+1}{2}\]},$ Wherein $p-\frac{d_1-1}{2}\≤b\≤p;$

Namely existTime, differential temperature background data groupIn each numerical value be: differential temperature value, Δ T [b] corresponding in differential temperature data set Δ T, front plus Δ T [b]Individual differential temperature numerical value, after adding Δ T [b]The meansigma methods of individual differential temperature numerical value, whereinRepresent differential temperature background data groupIn the differential temperature numerical value at b place, in this step calculating process, if the numerical value number before or after Δ T [b] is not enoughIndividual, namelyOrTime, thenNumerical value byOrReplace；

Step 5, for each monitoring point on optical cable, orderD be deduct the end make an uproar after differential temperature data set；

Step 6, to deduct the end make an uproar after differential temperature data set D in each numerical value carry out second space rolling average process, obtain final reference differential temperature data set Δ D, wherein second space rolling average process distance be d₂, d₂For odd number, then:

$\mathrm{\Δ}D\[b\]=\mathrm{\Δ}D\[\frac{d_2+1}{2}\],$ Wherein $1\≤b\≤\frac{d_2-1}{2};$

$\begin{array}{c}\mathrm{\Δ}D\[b\]=\frac{D\[b-\frac{d_2-1}{2}\]+D\[b-\frac{d_2-1}{2}+1\]+...D\[b\]+D\[b+1\]+...+D\[b+\frac{d_2-1}{2}\]}{d_2},\\ \frac{d_2+1}{2}\≤b\≤p-\frac{d_2+1}{2};\end{array}$

$\mathrm{\Δ}D\[b\]=\mathrm{\Δ}D\[p-\frac{d_2+1}{2}\],$ Wherein $p-\frac{d_2-1}{2}\≤b\≤p;$

Namely existTime, with reference to each numerical value in differential temperature data set Δ D be: deduct the end make an uproar after differential temperature data set D in corresponding deduct the end make an uproar after differential temperature numerical value D [b], front plus D [b]Individual deduct the end make an uproar after differential temperature numerical value, after adding D [b]Individual deduct the end make an uproar after the meansigma methods of differential temperature numerical value, wherein Δ D [b] represents the differential temperature numerical value at b place in the differential temperature data set D after deducting the end makes an uproar, 1≤b≤p, in this step calculating process, if the numerical value number deficiency before or after D [b]Individual, namelyOrTime, thenNumerical value byOrReplace；

Numerical value in step 7, the final reference differential temperature data set Δ D that step 6 is obtained and high alarm setting value T_uCarry out contrast to judge, if Δ D having a numerical value more than high alarm setting value T_u, then corresponding monitoring point is carried out fire alarm.

2. method according to claim 1, it is characterised in that: in described step 7, it is divided into following several types to process respectively according to the temperature data acquisition interval difference of distributed optical fiber temperature transducer system:

When the temperature data acquisition interval of distributed optical fiber temperature transducer system is more than 8 seconds: the numerical value in the final reference differential temperature data set Δ D directly step 6 obtained and high alarm setting value T_uCarry out contrast to judge, if Δ D having a numerical value more than high alarm setting value T_u, then corresponding monitoring point is carried out fire alarm；

If the temperature data acquisition interval of distributed optical fiber temperature transducer system is 3～8 seconds: the mode according to step 2～step 6, Continuous plus two is with reference to differential temperature data set Δ D, 2/3rds weights are accounted for by new reference differential temperature data set Δ D, old reference differential temperature data set Δ D accounts for 1/3rd weights, it is weighted average, obtain Δ D1, by the numerical value in Δ D1 and high alarm setting value T_uCarry out contrast to judge, if the reference differential temperature data set after weighted average has a numerical value more than high alarm setting value T_u, then corresponding monitoring point is carried out fire alarm；

If the temperature data acquisition interval of distributed optical fiber temperature transducer system was less than 3 seconds: the mode according to step 2～step 6, Continuous plus three is with reference to differential temperature data set Δ D, and these three is averaged with reference to differential temperature data set, obtain Δ D2, if then Δ D2 having a numerical value more than high alarm setting value T_u, then corresponding monitoring point is carried out fire alarm.

3. method according to claim 1 and 2, it is characterised in that: also include:

If step 8 fire alarm, further determining that the particular location of point occurs actual fire, the defining method of actual fire generation point is:

If the fire Alarm Call Point sequence number that step 7 obtains is p, calculating sequence number is that the left side, control point that the fire Alarm Call Point of p is corresponding is with reference to the long-pending A of differential temperature data surface_L, calculate on the right of this control point with reference to the long-pending A of differential temperature data surface_R, wherein A_LIt is multiplied by corresponding sequence number number sum, A less than the reference differential temperature data of the correspondence numerical value more than zero in all monitoring points of p point sequence number for sequence number_RIt is multiplied by corresponding sequence number number sum more than the reference differential temperature data of the correspondence numerical value more than zero in all monitoring points of p point sequence number for sequence number, set correction factor μ, correction factor μ is one and depends on the actually used property parameters adopting distributed optical fiber temperature transducer system, and this property parameters is calculated by pinpointing experiment；Then the position of actual fire generation point is

P=p+ (A_L-A_R)·μ。

4. method according to claim 1 and 2, it is characterised in that: 7≤n≤48,1≤m≤9,511≤d₁≤ 1001,11≤d₂≤21。