CN106768330A - A kind of flame detecting device based on spectrum - Google Patents
A kind of flame detecting device based on spectrum Download PDFInfo
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- CN106768330A CN106768330A CN201611169560.5A CN201611169560A CN106768330A CN 106768330 A CN106768330 A CN 106768330A CN 201611169560 A CN201611169560 A CN 201611169560A CN 106768330 A CN106768330 A CN 106768330A
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- 238000001228 spectrum Methods 0.000 title claims abstract description 50
- 230000005855 radiation Effects 0.000 claims abstract description 75
- 230000008859 change Effects 0.000 claims abstract description 56
- 238000012545 processing Methods 0.000 claims abstract description 9
- 230000000052 comparative effect Effects 0.000 claims description 5
- 238000001514 detection method Methods 0.000 abstract description 43
- 230000035945 sensitivity Effects 0.000 abstract description 12
- 230000004044 response Effects 0.000 abstract description 10
- 238000002485 combustion reaction Methods 0.000 description 18
- 238000004364 calculation method Methods 0.000 description 6
- 230000003595 spectral effect Effects 0.000 description 5
- 239000004215 Carbon black (E152) Substances 0.000 description 4
- 239000012141 concentrate Substances 0.000 description 4
- 239000000446 fuel Substances 0.000 description 4
- 229930195733 hydrocarbon Natural products 0.000 description 4
- 150000002430 hydrocarbons Chemical class 0.000 description 4
- 238000000034 method Methods 0.000 description 4
- 230000000694 effects Effects 0.000 description 3
- 230000002265 prevention Effects 0.000 description 3
- 238000010521 absorption reaction Methods 0.000 description 2
- 230000032683 aging Effects 0.000 description 2
- 238000013461 design Methods 0.000 description 2
- 238000007689 inspection Methods 0.000 description 2
- 230000003287 optical effect Effects 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 230000036632 reaction speed Effects 0.000 description 2
- 238000004611 spectroscopical analysis Methods 0.000 description 2
- 230000001629 suppression Effects 0.000 description 2
- 230000002889 sympathetic effect Effects 0.000 description 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- 241000736199 Paeonia Species 0.000 description 1
- 235000006484 Paeonia officinalis Nutrition 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000018109 developmental process Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000002708 enhancing effect Effects 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 239000007789 gas Substances 0.000 description 1
- 230000003760 hair shine Effects 0.000 description 1
- 229910052739 hydrogen Inorganic materials 0.000 description 1
- 239000001257 hydrogen Substances 0.000 description 1
- -1 hydrogen compound Chemical class 0.000 description 1
- 230000002452 interceptive effect Effects 0.000 description 1
- 230000007246 mechanism Effects 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
- 230000000149 penetrating effect Effects 0.000 description 1
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Classifications
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01J—MEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT, POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRARED, VISIBLE OR ULTRAVIOLET LIGHT; COLORIMETRY; RADIATION PYROMETRY
- G01J3/00—Spectrometry; Spectrophotometry; Monochromators; Measuring colours
- G01J3/28—Investigating the spectrum
Abstract
The present invention discloses a kind of flame detecting device based on spectrum, and the flame detecting device includes radiation sensitive unit and data processing unit.Radiation sensitive unit includes the radiation for sensing first wave length and exports the first radiation sensor of the first signal；Data processing unit includes control module, computing module and judge module, and wherein control module is used to control the radiation sensitive unit to be sensed to detect frequency；Computing module is used to calculate the amplitude change rate of the first signal；The amplitude change rate that judge module is based on the first signal judges whether flame.Flame detecting device based on spectrum of the invention, can be prevented effectively from the influence of interference signal, with high response speed, response sensitivity and detection accuracy rate, realize the quick and precisely detection to flame.
Description
Technical field
The present invention relates to fire defector technical field.More particularly, to a kind of flame detecting device based on spectrum.
Background technology
During fire detector is fire automatic alarm system, scene is detected, the equipment for finding fire is used for
Fire alarm and startup fire braking measure.Fire detector is system " sense organ ", during its effect is monitoring environment
Either with or without the generation of fire, once have the condition of a fire, just by the feature physical quantity of fire, such as temperature, smog, gas and radiation light intensity
Etc. being converted into electric signal, and act send alarm signal to fire alarm control unit immediately.Main fire detection domestic and international at present
Device type has smoke detector, temperature sensing fire detector, gaseous type fire detector and spectrum fire detector.Sense pyrotechnics
Calamity detector, temperature sensing fire detector and gaseous type fire detector detect mechanism limitation due to it, to fire response time mistake
It is long, or even there is failing to report phenomenon because detection parameter can not reach detector.Because spectrum fire detector has response
Speed is fast, detecting distance is remote and the features such as good environmental adaptability, so typically all carrying out fire using spectrum fire detector at present
Calamity is detected.
Any fuel, all can the light wave such as outside radiating visible light and infrared ray to some extent in burning.Fuel is different,
The optical band for giving off is just different.Burning condition is different, and detectability of the Fire Radiation light wave on each wave band is also different.It is actual
In, hydrocarbon fire naked light produced when occurring, with its distinctive spectral characteristic.The energy of burning things which may cause a fire disaster release is most of
Energy concentrates on infrared band and the infrared energy of different wave length is different.The infrared portion 4.3-4.4 microns of song for nearby occurring
Line bossing is known as CO2The CO of sympathetic response2Atomic group luminescent spectrum, it is sent out than other atoms, molecule or group in flame
The wire or band spectrum for going out have definitely big radiation intensity.According to flame spectrometry result, flame spectrum is with centre wavelength
4.3-4.4 microns of crest is the most obvious, because of its energy magnitude highest, is conducive to improving detector sensitivity, and sunlight exists
This wave band has a stronger absworption peak, and common light can be neglected 4.3-4.4 micron wave strong points amount of radiation is also very faint
Slightly.So being typically chosen the 4.3-4.4 microns of antijamming capability for being conducive to strengthening detector as detection wave band, improve reliable
Property.
Existing flame detecting device, is mostly to be used as characteristic wavelength by sensing 4.3-4.4 micron wave length signals to carry out
Flame judge, and Various Complex signal present in actually detected environment, such as sunshine, arclight, infrared spotlight radiation and
Heat radiation etc. can equally contain this feature wavelength, cause the inaccurate and high rate of false alarm of detection.To solve the problem, develop
Double spectrum flame detecting devices, reference signal is used as by selecting another spectral signal, and binding characteristic wavelength signals are believed with reference
Number simultaneously carry out flame judgement.Due to spectrum, amplitude is not fixed value in itself, according to whether in the presence of multiple selected spectrum or each
Whether the amplitude of selected spectrum reaches threshold value can not effectively distinguish flame and interference signal, therefore its false alarm prevention effect and pay no attention to
Think.In, although double spectrum flame detectors combine two infra-red radiations of different wave length, but still can not very well solve height
The problem of the mutual restriction that sensitivity is required with false alarm prevention：It is too low that the sensitivity of detector is set, and failing to report phenomenon easily occurs；
And the sensitivity setting of detector is too high, the output amplitude ratio of its interference signal can also meet its two passages fire completely
Signal amplitude ratio, is easily caused wrong report, such as lightning, electric welding light, ambient light influence.So current double spectrum fire defectors
Either device sensitivity is low, or false alarm prevention performance is undesirable, it is impossible to fire automatic alarm system is met to fire detector
Requirement.Due in the detection range of flame detector through being commonly present possible false alarm source, such as strong vehicle lamp light source
Deng there is rate of false alarm very high in existing flame detector, and the development to fire-fighting work brings very big inconvenience.
Accordingly, it would be desirable to one kind can effectively reduce combustion flame detector rate of false alarm, improve the alarm degree of accuracy based on light
The flame detecting device of spectrum.
The content of the invention
In order to improve above mentioned problem, it is an object of the invention to provide a kind of flame detecting device, combustion can be effectively reduced
Make a fire flame detector rate of false alarm, improve the alarm degree of accuracy.
To achieve the goal, the present invention uses following technical proposals：
A kind of flame detecting device based on spectrum, the flame detecting device includes radiation sensitive unit and data processing list
Unit, wherein
Radiation sensitive unit, including sense the radiation of first wave length and export the first radiation sensor of the first signal, the
One signal is the characteristic wavelength signal of combustion flame.The radiation signal that first radiation sensor is used for sensed characteristic wavelength simultaneously should
Radiation signal is converted into electric signal output.The intensity of radiation signal and the linear positive correlation of the amplitude of electric signal, the i.e. width of electric signal
It is worth the intensity for reflecting correspondence radiation signal.
Data processing unit, including control module, computing module and judge module, wherein
Control module, for controlling radiation sensitive unit to be sensed to detect frequency, detects the determination Ying Yiman of frequency
For the purpose of sufficient detection demand, while matching with data processing speed and detection means reaction speed.
Computing module, the amplitude change rate for calculating the first signal, the amplitude change rate of signal is letter in the unit time
The variable quantity of number amplitude.When computing module is calculated, amplitude change rate can select the adjacent difference in magnitude for detecting twice and phase
The business of time interval that neighbour detects twice represents, also can select any difference in magnitude for detecting twice with accordingly detect twice when
Between the business that is spaced represent.There is more preferable real-time and response high by calculating the adjacent result of calculation for detecting acquisition twice
Speed, by calculating the non-conterminous result of calculation for detecting acquisition twice with the degree of accuracy higher.But if calculate select when
Between be spaced it is long, can extend obtain result of calculation time, and further influence detection means it is ageing.
Judge module, the amplitude change rate based on the first signal judges whether flame.During flame combustion, its radiant light
The amplitude of spectrum is in dynamic change.In particular, at the initial stage of flame combustion, the amplitude of its radiation spectrum is significantly increased, is based on
This feature, can be made whether the judgement that there is flame according to the amplitude change rate of flame combustion characteristic wavelength.Existing inspection
To determinand, whether radiation feature wavelength carries out flame judgement in survey method, and flame judgement is carried out using existing detection method
When, if in the presence of the interference signal same or like with sensing signal wavelength, the interference signal will be mistaken for flare up fire simultaneously
Further result in the wrong report of detection means.Detection means of the invention is using the amplitude change rate of flame combustion characteristic wavelength to combustion
Burn signal and interference signal makes a distinction, reach and be prevented effectively from interference signal, improve the purpose of judging nicety rate.
Preferably, judge module is based on the amplitude change rate of the first signal and the comparative result of first threshold, judges whether
There is flame.First threshold is the numerical definiteness to the first signal amplitude rate of change, and only the amplitude change rate of the first signal expires
Sufficient comparative result, flame judge module is just judged as flame.By setting first threshold, significantly more efficient a part can be excluded dry
The influence of signal is disturbed, judgment accuracy higher is reached.
Preferably, first wave length is 4.3-4.4 microns.Any fuel, all can to some extent to external radiation in burning
The light wave such as visible ray and infrared ray.Fuel is different, and the optical band for giving off is just different.Burning condition is different, Fire Radiation light wave
Detectability on each wave band is also different.In practice, produced naked light, peculiar with its when hydrocarbon fire occurs
Spectral characteristic.The energy major part energy of burning things which may cause a fire disaster release concentrates on the infrared energy of infrared band and different wave length not
Together.The infrared portion 4.3-4.4 microns of curved convex part for nearby occurring is known as CO2The CO of sympathetic response2Atomic group luminescent spectrum,
The wire or band spectrum that it is sent than other atoms, molecule or group in flame have definitely big radiation intensity.According to fire
Flame Spectroscopic analysis results, flame spectrum is the most obvious with centre wavelength 4.3-4.4 microns of crest, because of its energy magnitude highest,
Be conducive to improving detector sensitivity, and sunlight has a stronger absworption peak in this wave band, and common light is in 4.3-4.4
Micron wave strong point amount of radiation is also very faint can be ignored.So 4.3-4.4 microns of selection is conducive to enhancing as detecting band
The antijamming capability of detector, improves reliability.
Preferably, radiation sensitive unit further includes the second spoke for sensing the radiation of second wave length and exporting secondary signal
Sensor is penetrated, judge module is based on the amplitude change rate and secondary signal of the first signal, and second wave length is different from first wave length, sentences
It is disconnected to whether there is flame.In the present invention, secondary signal is combined as reference signal by with the amplitude change rate of the first signal
Flame is judged.When carrying out flame and judging, in order to exclude with amplitude change rate identical with selected characteristic wave spectrum
The influence of interference signal, it is reference signal further to choose secondary signal.Secondary signal is another feature wave spectrum of flame,
And there is amplitude change rate identical with the first signal and the interference signal possibility of secondary signal same spectra will drop significantly simultaneously
It is low.Preferably, when there is secondary signal, judge module judges there is flame.Therefore, the preferred flame detecting device can be big
It is big to reduce rate of false alarm.
It is further preferred that being interfered to secondary signal to prevent from having faint interference signal, can be set
Two threshold values, when only meeting secondary signal intensity more than Second Threshold, judge module judges there is secondary signal, a stepping of going forward side by side
The judgement of row flame.
It is further preferred that computing module further calculates the amplitude change rate of secondary signal, judge module is based on first
The amplitude change rate of signal and the amplitude change rate of secondary signal judge whether flame.The first signal is obtained by calculating
The amplitude change rate of amplitude change rate and secondary signal, the only amplitude change rate of above-mentioned two signal meet requirement simultaneously, sentence
Disconnected module is just judged as flame.The preferred flame detecting device has more preferably accuracy in detection and rate of false alarm.
It is further preferred that second wave length is 3.8 microns.Hydrocarbon fire naked light produced when occurring, has
Its distinctive spectral characteristic.The energy major part energy of burning things which may cause a fire disaster release concentrates on the infrared energy of infrared band and different wave length
Amount is different.In addition to 4.3-4.4 microns of spectrum has good detectability, 3.8 microns of spectrum is equally with good
Detectability.
Preferably, radiation sensitive unit is further included to sense the radiation of the 3rd wavelength and exports the 3rd spoke of the 3rd signal
Sensor is penetrated, the amplitude change rate and the 3rd signal that judge module is based on the first signal judge whether flame.
It is further preferred that when there is three signals, judge module judges do not exist flame.During due to flame combustion not
In the presence of the UV signal of some particular range of wavelengths, can be by the 3rd radiation sensor to the UV signal of wavelength in the range of this
Detected to exclude the presence of flame.When being judged, the preferably judgement of the 3rd signal existence has height to judge module
Priority：If detecting in the presence of the 3rd signal, this detection terminates, and flame judge module judges do not exist flame；If visiting
Measure in the absence of the 3rd signal, then continue the calculating of the first signal amplitude rate of change and the judgement of flame.In this way it is possible to
Quickening judges speed, reduces calculating process, improves detector sensitivity.Further, in order to prevent from having faint interference
Signal is interfered to the 3rd signal, can set the 3rd threshold value, when only meeting the 3rd signal intensity more than three threshold values, is sentenced
Disconnected module judges the 3rd signal, and further carries out the judgement of flame.
It is further preferred that the 3rd wavelength is 254 nanometers.Absorption due to atmosphere to short wave ultraviolet, makes sun spoke
Penetrate and be irradiated to the ultraviolet of earth surface and there was only wavelength more than 0.29 micron of long wave ultraviolet, less than 0.29 micron of shortwave speed
Radiation long is seldom observed at the earth's surface.Therefore, using less than 0.29 micron of wave band as purple in flame detector design
Outside line detection zone, the ultraviolet radiation sensor being operated in the detection zone is not responding to solar radiation, so as to avoid daylight
Interference.In the UV signal of burning radiation, wavelength is that 254 nanometers of signal has more preferable detection feature.
Beneficial effects of the present invention are as follows：
Flame detecting device based on spectrum in the present invention, one radiation sensor of selection carries out the sense of characteristic wavelength to environment
Survey, the rate of change of the amplitude according to the signal characteristic wavelength judges whether flame.In addition, selecting another radiation sensor pair
Environment carries out the sensing of another reference wavelength, and the amplitude change rate of feature based wavelength and reference wavelength judges whether fire
Flame.Further, interference signal when selecting another radiation sensor to judge burning is excluded.Flame inspection of the invention
Surveying device can be prevented effectively from the influence of interference signal, with high response speed, response sensitivity and detection accuracy rate, can
Realize the effective detection to flame.
Flame detection device of the invention can be widely used for the combustion flame detection to environment to be measured, and be particularly suitable for
In the blast occurred to colliery and the quick detection of burning.
Brief description of the drawings
Specific embodiment of the invention is described in further detail below in conjunction with the accompanying drawings.
Fig. 1 shows the structure chart of according to embodiments of the present invention 1 flame detecting device.
Fig. 2 shows the structure chart of according to embodiments of the present invention 2 flame detecting device.
Fig. 3 shows the structure chart of according to embodiments of the present invention 3 flame detecting device.
Specific embodiment
In order to illustrate more clearly of the present invention, the present invention is done further with reference to preferred embodiments and drawings
It is bright.Similar part is indicated with identical reference in accompanying drawing.It will be appreciated by those skilled in the art that institute is specific below
The content of description is illustrative and be not restrictive, and should not be limited the scope of the invention with this.
Embodiment 1
A kind of flame detecting device based on spectrum, the flame detecting device includes radiation sensitive unit and data processing list
Unit, wherein radiation sensitive unit include the first radiation sensor of the radiation for sensing first wave length and the first signal of output,
First signal is the characteristic wavelength signal of combustion flame.First radiation sensor is used for the radiation signal of sensed characteristic wavelength and incites somebody to action
The radiation signal is converted into electric signal output.The intensity of radiation signal and the linear positive correlation of the amplitude of electric signal, i.e. electric signal
Amplitude is used to reflect the intensity of correspondence radiation signal.Data processing unit, including control module, computing module and judge module,
Wherein control module is used to control radiation sensitive unit to be sensed to detect frequency, detects that the determination of frequency should be to meet detection
For the purpose of demand, while matching with data processing speed and detection means reaction speed.Computing module is used to calculate the first letter
Number amplitude change rate, the amplitude change rate of signal is the variable quantity of signal amplitude in the unit time.Computing module is calculated
When, amplitude change rate can be represented from the adjacent difference in magnitude for detecting twice with the business of the adjacent time interval for detecting twice,
Also any difference in magnitude for detecting twice is can select to be represented with the business of the time interval for accordingly detecting twice.By calculating adjacent two
The result of calculation that secondary detection is obtained has more preferable real-time and corresponding speed high, is obtained by calculating non-conterminous detection twice
Result of calculation have the degree of accuracy higher.But if it is long to calculate the time interval selected, acquisition result of calculation can be extended
Time, and further influence the ageing of detection means.The amplitude change rate that judge module is based on the first signal judges whether to deposit
In flame.During flame combustion, the amplitude of its radiation spectrum is in dynamic change.In particular, at the initial stage of flame combustion, its spoke
The amplitude for penetrating spectrum is significantly increased, and based on this feature, can be carried out according to the amplitude change rate to flame combustion characteristic wavelength
With the presence or absence of the judgement of flame.To determinand, whether radiation feature wavelength carries out flame judgement in existing detection method, uses
When existing detection method carries out flame and judges, if in the presence of with sensing signal wavelength identical interference signal, the interference signal will
Flare up fire can be mistaken for and the wrong report of detection means is further resulted in.Interference signal is generally fixed amplitude intensity or amplitude
The little signal of Strength Changes, detection means of the invention effectively can make a distinction to burning signal and interference signal, and reaching has
Effect avoids interference signal, improves the purpose of judging nicety rate.
It it is 4.3-4.4 microns from first wave length, for carbon in the flame detecting device based on spectrum of the present embodiment
The detection of hydrogen compound fire naked light produced when occurring.
When the flame detecting device based on spectrum of the present embodiment carries out flame and judges, judge module is based on the first signal
Amplitude change rate and the comparative result of first threshold, judge whether flame.First threshold is that the first signal amplitude is changed
The numerical definiteness of rate, the amplitude change rate of only the first signal meets comparative result, and flame judge module is just judged as flame.It is logical
Setting first threshold is crossed, the significantly more efficient influence for excluding a part of interference signal of energy reaches judgment accuracy higher.Enter one
Step, if the amplitude change rate of the first signal is more than the first threshold of setting, judge module is judged as flame.First threshold it is big
I needs to be adjusted according to actual detection.A kind of possible adjustment mode is：Increase corresponding threshold in order to reduce rate of false alarm
Value, or respective threshold is reduced to improve sensitivity, to obtain optimal result of detection.
By the judgement to characteristic wavelength amplitude change rate, flame can be judged response speed control in 1 second, or even
In 500 milliseconds.Flame detecting device based on spectrum of the invention, with high response speed, response sensitivity and accuracy rate.
Flame detecting device based on spectrum of the invention is connected with suppression combustion device, suppression combustion device, control fire can be early triggered
The scope and intensity of flame burning, reduce the harm and loss of combustion zone.
Test of the flame detection device of the embodiment to sunshine, car light, air-heater, infrared spotlight and arclight
Do not occur wrong report.
Embodiment 2
Fig. 2 shows a kind of flame detecting device based on spectrum according to embodiment 2, and the difference with embodiment 1 exists
In radiation sensitive unit further includes the second radiation sensor for sensing the radiation of second wave length and exporting secondary signal, sentences
Disconnected module is based on the amplitude change rate and secondary signal of the first signal, and second wave length is different from first wave length, judges whether
Flame.In the present invention, secondary signal is carried out by being combined with the amplitude change rate of the first signal as reference signal to flame
Judge.When carrying out flame and judging, in order to exclude the interference signal with amplitude change rate identical with selected characteristic wave spectrum
Influence, it is reference signal further to choose secondary signal.Secondary signal is another feature wave spectrum of flame, and is had simultaneously
The interference signal possibility of amplitude change rate identical with the first signal and secondary signal same spectra will be substantially reduced, therefore, this
The flame detecting device based on spectrum can substantially reduce rate of false alarm in invention.
In the present embodiment, second wave length is 3.8 microns.Hydrocarbon fire naked light produced when occurring, with it
Distinctive spectral characteristic.The energy major part energy of burning things which may cause a fire disaster release concentrates on the infrared energy of infrared band and different wave length
It is different.In addition to 4.3-4.4 microns of spectrum has good detectability, 3.8 microns of spectrum equally can with good
Detection property.
When the flame detecting device based on spectrum carries out flame and judges in the present embodiment, when there is secondary signal, judgement
Module judges there is flame.Further, secondary signal is interfered in order to prevent from having faint interference signal, Ke Yishe
Determine Second Threshold, when only meeting secondary signal intensity more than Second Threshold, judge module judges there is secondary signal, goes forward side by side one
Step carries out the judgement of flame.
Another preferred judgment mode of the present embodiment is：Computing module further calculates the amplitude change of secondary signal
Rate, the amplitude change rate of amplitude change rate and secondary signal that judge module is based on the first signal judges whether flame.It is logical
The amplitude change rate for calculating the amplitude change rate and secondary signal that obtain the first signal is crossed, the preferably amplitude of above-mentioned two signal becomes
Rate meets requirement simultaneously, and judge module is just judged as flame.The amplitude change rate of the first and second signals is all met when requiring,
Enough influences for excluding most interference signals so that the flame detecting device based on spectrum is to occurring in detection ring in the present invention
The blast and burning in border have high accuracy in detection and extremely low rate of false alarm.
Embodiment 3
Fig. 3 shows a kind of flame detecting device based on spectrum according to embodiment 3, and the difference with embodiment 1 exists
In radiation sensitive unit is further included to sense the radiation of the 3rd wavelength and exports the 3rd radiation sensor of the 3rd signal, is sentenced
The amplitude change rate and the 3rd signal that disconnected module is based on the first signal judge whether flame.
When the flame detecting device based on spectrum is judged in the present embodiment, when there is three signals, judge module
Judge do not exist flame.Do not exist UV signal during due to flame combustion, can be by the 3rd radiation sensor to UV signal
Detected and burn excluding environment to be measured.Judge module carries out the 3rd signal existence first when being judged
Judge：If detecting in the presence of the 3rd signal, this detection terminates, and flame judge module judges do not exist flame；If detecting
In the absence of the 3rd signal, then continue the calculating of the first signal amplitude rate of change and the judgement of flame.Preferentially the 3rd signal is carried out
Judge, judged after being excluded, can accelerate to judge speed, reduce calculating process, improve detector sensitivity.Enter one
Step ground, interferes to prevent from having faint interference signal to the 3rd signal, can set the 3rd threshold value, only meets the
When three signal intensities are more than three threshold values, judge module judges the 3rd signal, and further carries out the judgement of flame.
The 3rd wavelength is 254 nanometers in the present embodiment.Absorption due to atmosphere to short wave ultraviolet, shines solar radiation
The ultraviolet for being mapped to earth surface only has long wave ultraviolet of the wavelength more than 0.29 micron, less than 0.29 micron of shortwave speed spoke long
Penetrate and seldom observe at the earth's surface.Therefore, using less than 0.29 micron of wave band as ultraviolet in flame detector design
Detection zone, the ultraviolet radiation sensor being operated in the detection zone is not responding to solar radiation, so as to avoid the dry of daylight
Disturb.In the UV signal of burning radiation, wavelength is that 254 nanometers of signal has more preferable detection feature.
Embodiment 2 can be used in combination with embodiment 3.
Tested by above-described embodiment, the flame detecting device based on spectrum is to interfering signal in the present invention
With extremely strong immunocompetence：
1st, the sunshine of direct projection or reflection；
2nd, power is 100 watts of Chinese herbaceous peony headlamp at 200 meters of distance；
3rd, riflery flame at 300 meters of distance；
4th, power is the heat radiation of 500 watts of air-heater at 400 meters of distance；
5th, power is 200 watts of infrared spotlight radiation at 500 meters of distance；
6th, current strength is the arclight of 200 peaces at 500 meters of distance.
Obviously, the above embodiment of the present invention is only intended to clearly illustrate example of the present invention, and is not right
The restriction of embodiments of the present invention, for those of ordinary skill in the field, may be used also on the basis of the above description
To make other changes in different forms, all of implementation method cannot be exhaustive here, it is every to belong to this hair
Obvious change that bright technical scheme is extended out changes row still in protection scope of the present invention.
Claims (10)
1. a kind of flame detecting device based on spectrum, it is characterised in that the flame detecting device includes
Radiation sensitive unit, including sense the radiation of first wave length and export the first radiation sensor of the first signal；
Data processing unit, including
Control module, for controlling the radiation sensitive unit to be sensed to detect frequency；
Computing module, the amplitude change rate for calculating the first signal；With
Judge module, the amplitude change rate based on the first signal judges whether flame.
2. flame detecting device according to claim 1, it is characterised in that the judge module is based on the width of the first signal
Value changes rate and the comparative result of first threshold, judge whether flame.
3. flame detecting device according to claim 1, it is characterised in that the first wave length is 4.3-4.4 microns.
4. flame detecting device according to claim 1, it is characterised in that the radiation sensitive unit further includes sense
Survey the radiation of second wave length and export the second radiation sensor of secondary signal, the judge module is based on first signal
Amplitude change rate and secondary signal, the second wave length are different from the first wave length, judge whether flame.
5. flame detecting device according to claim 4, it is characterised in that when there is secondary signal, the judgement mould
Block judges there is flame.
6. flame detecting device according to claim 4, it is characterised in that the computing module further calculates second to be believed
Number amplitude change rate, the judge module be based on first signal amplitude change rate and secondary signal amplitude change rate
Judge whether flame.
7. flame detecting device according to claim 4, it is characterised in that the second wave length is 3.8 microns.
8. flame detecting device according to claim 1, it is characterised in that the radiation sensitive unit further includes sense
Survey the radiation of the 3rd wavelength and export the 3rd radiation sensor of the 3rd signal, the judge module is based on first signal
Amplitude change rate and the 3rd signal judge whether flame.
9. flame detecting device according to claim 8, it is characterised in that when there is three signals, the judgement mould
Block judges do not exist flame.
10. flame detecting device according to claim 8, it is characterised in that the 3rd wavelength is 254 nanometers.
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
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| CN109682475A (en) * | 2018-12-29 | 2019-04-26 | 南京林业大学 | A kind of wooden dust flame detecting device and method based on potassium element |
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| CN114708559A (en) * | 2022-05-31 | 2022-07-05 | 杭州微影软件有限公司 | Image processing method and device, thermal imaging equipment and storage medium |
| CN114708559B (en) * | 2022-05-31 | 2022-11-04 | 杭州微影软件有限公司 | Image processing method and device, thermal imaging equipment and storage medium |
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| CN106768330B (en) | 2019-02-26 |
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