CN105354974A - Flame detection method based on three-wavelength infrared flame detector - Google Patents
Flame detection method based on three-wavelength infrared flame detector Download PDFInfo
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- 238000000034 method Methods 0.000 description 6
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- 238000005516 engineering process Methods 0.000 description 4
- 238000012913 prioritisation Methods 0.000 description 4
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- 206010020843 Hyperthermia Diseases 0.000 description 1
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- G—PHYSICS
- G08—SIGNALLING
- G08B—SIGNALLING OR CALLING SYSTEMS; ORDER TELEGRAPHS; ALARM SYSTEMS
- G08B17/00—Fire alarms; Alarms responsive to explosion
- G08B17/12—Actuation by presence of radiation or particles, e.g. of infrared radiation or of ions
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Abstract
The invention discloses a flame detection method based on a three-wavelength infrared flame detector. The three-wavelength infrared flame detector comprises a flame detection infrared sensing module, a first reference infrared sensing module, a second reference infrared sensing module and an alarm module. Each of the flame detection infrared sensing module, the first reference infrared sensing module and the second reference infrared sensing module includes an infrared sensor, a signal pre-processing circuit, an amplification circuit and a filter circuit, which are connected in sequence. The sense wavelengths of the three infrared sensors are 4.26+/-0.2 micrometers, 3.8+/-0.2 micrometers and 4.8+/-0.2 micrometers respectively. Output signals of the three sensing modules are obtained, the power of the output signals is calculated, and comparison is performed to determine whether a fire occurs. The three-wavelength infrared flame detector is simple in design, low in rate of false alarm and high in detection sensitivity, and is convenient to use.
Description
Technical field
The present invention relates to flame detecting field, particularly relate to a kind of flame detection method based on three-wavelength infrared flame detector.
Background technology
The existing fire detector of current China can be divided into smoke detector, heat detector, gas fire detector and flame detector according to information acquisition type.
The solid that smoke detector produces burning or pyrolysis or liquid particle very responsive, be commonly used to the various visible or sightless substance combustion product of detection and slow initial fire disaster on fire.Smoke detector is divided into photoelectric smoke detector, ionization smoke detector and infrared light beamforming smoke detector according to Cleaning Principle; Photoelectric detector utilize smoke particle to light refraction, penetrate loose, block or the principle that absorbs and designing, correspondingly have scatter-type and obscuration-type photoelectric detector, its inner optical system and infrared light sources of adopting is as sensitive detection parts; Ion-type detector utilizes smoke particle change the electric current principle of ionization chamber and design, and its inner radioactive source ionization chamber that adopts is as senser element; Infrared light beamforming smoke detector utilizes smoke particle scattering or absorbs the principle of infrared beam and design, and mainly comprises a light source, a set of light sighting means and a receiving trap.
Smoke detector can detect the gasoloid or smoke particle concentration that the substance combustion initial stage produces, and detection period early.Such detector is applicable to produce a large amount of smog and a small amount of heat, seldom or do not have the fire of Fire Radiation.But it is undesirable to the condition of a fire Effect on Detecting that smog is little, and response speed is also slower.
Heat fire detector is responsive especially the abnormal temperature to scene of fire, temperature rise rate and the temperature difference, correspondingly can be divided into constant temperature fire detector, temperature rise fire detector, differential fire detector.The core devices of heat fire detector is thermal sensing element, and its resistance correspondingly changes with the change of the temperature difference, thus temperature signal is transformed into electric signal, and carries out alert process.Heat detector be applicable to relative humidity often higher than 85%, be rich in dust and water smoke be detained, smokeless, have the place such as smog and steam.And the temperature variation of a scene of fire normally process slowly, therefore this fire detector response speed is the slowest, is difficult to realize Realtime Alerts.
Gas fire detector mainly detects the concentration of gas and dust in inflammable and explosive occasion, is a kind of instrument of monitoring of environmental gas concentration.The detector generally action warning when inflammable gas concentration reaches the 1/5-1/6 of concentration of lower explosive limit.Such detector is generally used in the place of distributing inflammable gas or flammable liquid steam, as colliery, refuelling station etc., mainly does prediction of reporting to the police, and reports to the police before not yet causing fire and blast.Because inflammable gas is to the long-term corrosion effect of detector, needs regularly to clean detector, make system sensitivity unaffected.And not causing the significant change of on-the-spot flammable explosive gas concentration due to the condition of a fire of some occasion, detector cannot be reported to the police, and limits its range of application.
Flame detector mainly responds the light characteristic of fire, is a kind of Novel fire detector detecting spectral radiance in flame combustion process and flame flicking frequency.According to Planck blackbody radiation law, any temperature all can constantly peripherad space radiation electromagnetic wave higher than the object of absolute zero.The electromagnetic wave spread of blackbody radiation is zero to positive infinity in theory, and the neighbouring interval of most of energy centralization wavelength, size and the blackbody temperature of energy are directly proportional, and center electromagnetic wavelength and blackbody temperature are inversely proportional to.The inevitable rising along with local temperature of burning of any material. thus the electromagenetic wave radiation of some strength is produced at its surrounding space.The feature that the radiation spectrum produced in substance combustion process has it intrinsic, utilizes sensor to carry out measuring radiation signal, just can detect the generation of flame.The ultimate principle of Here it is flame detector.It has flame fast response time, reliability is high. the feature that detection range is far away, structure is explosion-proof, and have good immunization to wind, rain, high temperature, high humidity and the undesired signal such as surround lighting and artificial light source, can forecast that there is higher warning sensitivity and reliability fast, like clockwork to fire.
According to the light characteristic of flame, the flame detector used at present has three kinds: a kind of is ultraviolet detector to the shorter ultraviolet radiation sensitivity of flame medium wavelength; Another kind is to the radiosensitive infrared eye of the infrared light that flame medium wavelength is longer; Simultaneously the third detect the shorter ultraviolet of flame medium wavelength and the longer ultrared ultraviolet/infrared mix probe of wavelength.Wherein infrared flame detector is responsive to the infrared light radiation signal that Fire Radiation spectrum medium wavelength is longer, is applicable to the fire that detection hydro carbons organic compound causes; And ultraviolet flame detector is responsive to the ultraviolet radiation that Fire Radiation spectrum medium wavelength is shorter, be applicable to detection metallic fires, as magnesium, aluminium, although range of application relative narrower. and the superior performance of purplish red outer mix probe, be applicable to various detection, but because it adopts more sensor than similar flame detector usually, cost is too expensive, limits its use to a certain extent.
To send the electromagnetic wave of some strength during single band infrared flame detector hydrocarbons (such as methane, oils etc.) burning, electromagnetic wavelength is mainly distributed in infrared region.Its products of combustion CO2 is heated at 4.26um wave band place resoance radiation peak value, strengthens the infrared electromagnetic energy of this wave band.Single band infrared flame detector utilizes this flame spectrum feature to design just.It utilizes optical filter to gather the infrared radiation signal of the narrow wave band of 4.26um.Meanwhile, usually add flame flicking analysis, to distinguish flare up fire and undesired signal better, improve the antijamming capability of detector.
Single band infrared flame detector simplicity of design, with low cost.Also have certain rejection ability to the undesired signal such as solar radiation, UV radiation, but there is the shortcomings such as detection sensitivity is low, false alarm rate is high, main cause is as follows:
1. usually there is the interference source such as artificial heat, artificial light source in industrial environment, the electromagenetic wave radiation signal of these interference sources may cover the flame detecting wave band of single band infrared flame detector.Detector only detects the infrared radiation signal of the narrow wave band of 4.26um, cannot distinguish the difference of real flame signal and undesired signal, reduces warning accuracy rate.
2. the electromagnetic infrared wave of real flame radiation is easily by the gas in environment, the scattering of dust institute, reflection and absorption.Therefore, along with the increase of Fire Radiation electromagnetic transmission distance, its signal intensity acutely decays. and single band flame detector only compares collection signal amplitude and setting threshold value, and cannot detect remote flare up fire, detector sensitivity is restricted.
Just because of above-mentioned shortcoming, single band flame detector is only suitable for simple occasion and uses.
Traditional single infrared flame detector only gathers the sensing data of single passage, cannot distinguish real flame signal and undesired signal, is difficult to suppress the interference in environment, and therefore rate of false alarm is high.Bi wave band infra red flame detector adopts two infrared sensors to detect flare up fire and undesired signal, thus realizes the resolution to flame and interference: the infrared radiation (centre wavelength is generally 4.26um) sent in the 1st infrared sensor detecting hydrocarbon compounds combustion process; 2nd infrared sensor mainly detects non-fire infrared radiation (centre wavelength is generally 3.8um), as modulation artificial heat, sunshine, and artificial light source, arc welding etc.The detection signal of two-way sensor is after amplifying and processing, and input system processor carries out digital filtering process simultaneously, and adopts flame identification algorithm to carry out the logic analyses such as threshold value, flicker, correlative to the data after process, determines whether fire and occurs.
Bi wave band infra red flame detector overcomes the interference of background radiation to a certain extent, improves detection sensitivity, has detection performance more better than single band infrared flame detector.But still there is the shortcomings such as false alarm rate is high, detection range is short on the whole, main cause is as follows:
1. a small amount of CO2 gas existed in environment has very strong absorption to the resonance peak radiation signal that flame sends at 4.26um wave band, thus Fire Radiation signal energy is caused to fall sharply with the increase of propagation distance, when detection range is increased to a certain degree, Fire Radiation signal amplitude received by detector does not reach defined threshold, and flame detector cannot respond the carrying out of flare up fire effectively.
2.4.26um resonance peak radiation signal is the main target signal to flame detecting, but owing to causing the loss of signal when this signal is propagated in the environment, its detection amplitude and second channel 3.8um place is made to detect the ratio of amplitude close to 1:1, no longer the due ratio of common flame, even if make have flame to exist in environment, detector can not send alerting signal, and detector produces and fails to report.
3., although dual-band flame detectors adopts two breath technology to eliminate the interference of hyperthermia radiation source to detector to a certain extent, it is still helpless to the interference caused by some special background radiation source.Usual needs are compromised between false alarm rate and sensitivity, have impact on the overall performance of system.
Summary of the invention
Technical matters to be solved by this invention is for defect involved in background technology, provides a kind of flame detection method based on three-wavelength infrared flame detector.
The present invention is for solving the problems of the technologies described above by the following technical solutions:
Based on the flame detection method of three-wavelength infrared flame detector, described three-wavelength infrared flame detector comprises fire defector infrared induction module, first with reference to infrared induction module, second with reference to infrared induction module and alarm module;
Described fire defector infrared induction module, first all comprises with reference to infrared induction module infrared sensor, signal pre-processing circuit, amplifying circuit and the filtering circuit that order is successively connected with reference to infrared induction module, second, and fire defector infrared induction module, first is connected with control module with reference to the output terminal of the filtering circuit in infrared induction module is equal with reference to infrared induction module, second;
In described fire defector infrared induction module, infrared inductor is the infrared sensor of 4.26 ± 0.2 micron wave lengths;
In described first reference infrared induction module, infrared inductor is the infrared sensor of 3.8 ± 0.2 micron wave lengths;
In described first reference infrared induction module, infrared inductor is the infrared sensor of 4.8 ± 0.2 micron wave lengths;
Described alarm module is used for reporting to the police;
Described flame detection method comprises following steps:
Step 1), obtains the output signal of fire defector infrared induction module, the first reference infrared induction module, the second reference infrared induction module respectively;
Step 2), the calculating of the power that respectively output signal of fire defector infrared induction module, the first reference infrared induction module, the second reference infrared induction module is averaged;
Step 3), if the output signal average power of fire defector infrared induction module is greater than the output signal average power of the first reference infrared induction module of 2.5 times, and the output signal average power of fire defector infrared induction module is greater than the output signal average power of the second reference infrared induction module of 2.5 times, judge to there is flame, control alarm module and report to the police.
As the further prioritization scheme of a kind of flame detection method based on three-wavelength infrared flame detector of the present invention, described alarm module adopts acoustic-optic alarm.
As the further prioritization scheme of a kind of flame detection method based on three-wavelength infrared flame detector of the present invention, described amplifying circuit is second amplifying circuit, and wherein the voltage output end of higher level's amplifying circuit connects the voltage input end of subordinate's amplifying circuit.
As the further prioritization scheme of a kind of flame detection method based on three-wavelength infrared flame detector of the present invention, described filtering circuit is multistage low-pass filter circuit.
As the further prioritization scheme of a kind of flame detection method based on three-wavelength infrared flame detector of the present invention, described filtering circuit is that the band of 2-30Hz leads to secondary filter circuit.
The present invention adopts above technical scheme compared with prior art, has following technique effect:
1. simplicity of design, easy to use;
2. rate of false alarm is low;
3. detection sensitivity is high, and detection range is long.
Embodiment
Below technical scheme of the present invention is described in further detail:
The invention discloses a kind of flame detection method based on three-wavelength infrared flame detector, described three-wavelength infrared flame detector comprises fire defector infrared induction module, first with reference to infrared induction module, second with reference to infrared induction module and alarm module;
Described fire defector infrared induction module, first all comprises with reference to infrared induction module infrared sensor, signal pre-processing circuit, amplifying circuit and the filtering circuit that order is successively connected with reference to infrared induction module, second, and fire defector infrared induction module, first is connected with control module with reference to the output terminal of the filtering circuit in infrared induction module is equal with reference to infrared induction module, second;
In described fire defector infrared induction module, infrared inductor is the infrared sensor of 4.26 ± 0.2 micron wave lengths;
In described first reference infrared induction module, infrared inductor is the infrared sensor of 3.8 ± 0.2 micron wave lengths;
In described first reference infrared induction module, infrared inductor is the infrared sensor of 4.8 ± 0.2 micron wave lengths;
Described alarm module is used for reporting to the police;
Described flame detection method comprises following steps:
Step 1), obtains the output signal of fire defector infrared induction module, the first reference infrared induction module, the second reference infrared induction module respectively;
Step 2), the calculating of the power that respectively output signal of fire defector infrared induction module, the first reference infrared induction module, the second reference infrared induction module is averaged;
Step 3), if the output signal average power of fire defector infrared induction module is greater than the output signal average power of the first reference infrared induction module of 2.5 times, and the output signal average power of fire defector infrared induction module is greater than the output signal average power of the second reference infrared induction module of 2.5 times, judge to there is flame, control alarm module and report to the police.
Described alarm module adopts acoustic-optic alarm.
Described amplifying circuit is second amplifying circuit, and wherein the voltage output end of higher level's amplifying circuit connects the voltage input end of subordinate's amplifying circuit.
Described filtering circuit is multistage low-pass filter circuit, and the band being preferably 2-30Hz leads to secondary filter circuit.
Those skilled in the art of the present technique are understandable that, unless otherwise defined, all terms used herein (comprising technical term and scientific terminology) have the meaning identical with the general understanding of the those of ordinary skill in field belonging to the present invention.Should also be understood that those terms defined in such as general dictionary should be understood to have the meaning consistent with the meaning in the context of prior art, unless and define as here, can not explain by idealized or too formal implication.
Above-described embodiment; object of the present invention, technical scheme and beneficial effect are further described; be understood that; the foregoing is only the specific embodiment of the present invention; be not limited to the present invention; within the spirit and principles in the present invention all, any amendment made, equivalent replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (5)
1., based on the flame detection method of three-wavelength infrared flame detector, described three-wavelength infrared flame detector comprises fire defector infrared induction module, first with reference to infrared induction module, second with reference to infrared induction module and alarm module;
Described fire defector infrared induction module, first all comprises with reference to infrared induction module infrared sensor, signal pre-processing circuit, amplifying circuit and the filtering circuit that order is successively connected with reference to infrared induction module, second, and fire defector infrared induction module, first is connected with control module with reference to the output terminal of the filtering circuit in infrared induction module is equal with reference to infrared induction module, second;
In described fire defector infrared induction module, infrared inductor is the infrared sensor of 4.26 ± 0.2 micron wave lengths;
In described first reference infrared induction module, infrared inductor is the infrared sensor of 3.8 ± 0.2 micron wave lengths;
In described first reference infrared induction module, infrared inductor is the infrared sensor of 4.8 ± 0.2 micron wave lengths;
Described alarm module is used for reporting to the police;
It is characterized in that, described flame detection method comprises following steps:
Step 1), obtains the output signal of fire defector infrared induction module, the first reference infrared induction module, the second reference infrared induction module respectively;
Step 2), the calculating of the power that respectively output signal of fire defector infrared induction module, the first reference infrared induction module, the second reference infrared induction module is averaged;
Step 3), if the output signal average power of fire defector infrared induction module is greater than the output signal average power of the first reference infrared induction module of 2.5 times, and the output signal average power of fire defector infrared induction module is greater than the output signal average power of the second reference infrared induction module of 2.5 times, judge to there is flame, control alarm module and report to the police.
2. the flame detection method based on three-wavelength infrared flame detector according to claim 1, described alarm module adopts acoustic-optic alarm.
3. the flame detection method based on three-wavelength infrared flame detector according to claim 1, is characterized in that, described amplifying circuit is second amplifying circuit, and wherein the voltage output end of higher level's amplifying circuit connects the voltage input end of subordinate's amplifying circuit.
4. the flame detection method based on three-wavelength infrared flame detector according to claim 1, is characterized in that, described filtering circuit is multistage low-pass filter circuit.
5. the flame detection method based on three-wavelength infrared flame detector according to claim 4, is characterized in that, described filtering circuit is that the band of 2-30Hz leads to secondary filter circuit.
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN106023514A (en) * | 2016-07-25 | 2016-10-12 | 上海腾盛智能安全科技股份有限公司 | Wireless flame detection system |
| CN106384468A (en) * | 2016-10-12 | 2017-02-08 | 重庆蓝岸通讯技术有限公司 | Forest fire monitoring system based on DPMR protocol |
| CN108010254A (en) * | 2017-11-28 | 2018-05-08 | 无锡职业技术学院 | One kind is based on four wave band infrared flame detectors and its flame identification algorithm |
| CN108470418A (en) * | 2018-04-02 | 2018-08-31 | 深圳汇创联合自动化控制有限公司 | A kind of accurate building fire early warning system of early warning |
| CN111862522A (en) * | 2020-05-29 | 2020-10-30 | 安徽皖讯智能科技有限公司 | 3-infrared-based composite fire detection algorithm |
| CN113160513A (en) * | 2021-04-19 | 2021-07-23 | 杭州舜程科技有限公司 | Flame detection device based on multisensor |
| CN113313903A (en) * | 2021-04-06 | 2021-08-27 | 中国船舶重工集团公司第七0三研究所 | Multi-parameter data fusion fire judgment method |
| CN115294715A (en) * | 2022-07-29 | 2022-11-04 | 浙江华消科技有限公司 | Flame identification method and device |
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106023514A (en) * | 2016-07-25 | 2016-10-12 | 上海腾盛智能安全科技股份有限公司 | Wireless flame detection system |
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| CN111862522A (en) * | 2020-05-29 | 2020-10-30 | 安徽皖讯智能科技有限公司 | 3-infrared-based composite fire detection algorithm |
| CN113313903A (en) * | 2021-04-06 | 2021-08-27 | 中国船舶重工集团公司第七0三研究所 | Multi-parameter data fusion fire judgment method |
| CN113160513A (en) * | 2021-04-19 | 2021-07-23 | 杭州舜程科技有限公司 | Flame detection device based on multisensor |
| CN115294715A (en) * | 2022-07-29 | 2022-11-04 | 浙江华消科技有限公司 | Flame identification method and device |
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