CN106128004A - Fire detector based on array gas sensor - Google Patents
Fire detector based on array gas sensor Download PDFInfo
- Publication number
- CN106128004A CN106128004A CN201610576388.9A CN201610576388A CN106128004A CN 106128004 A CN106128004 A CN 106128004A CN 201610576388 A CN201610576388 A CN 201610576388A CN 106128004 A CN106128004 A CN 106128004A
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- fire
- gas
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- sensor
- fire detector
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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
- G08B17/10—Actuation by presence of smoke or gases, e.g. automatic alarm devices for analysing flowing fluid materials by the use of optical means
Abstract
The present invention provides a kind of fire detector based on array gas sensor, this fire detector includes sensor assembly and signal acquisition module, sensor assembly is resistor-type semiconductor array type gas sensor, the outfan of sensor array is connected with signal acquisition module, forms the fire detector of array gas sensor.Provide the benefit that this detector rate of false alarm of employing reduces more than an order of magnitude, multiple gases can be detected simultaneously, improve accuracy of detection, and judge, according to the concentration ratio of gas type and every kind of gas, the classification that fire occurs.When fire detector of the present invention is used for cockpit, freight house, burning or pyrolytic material type can be inferred according to gas type, and then can determine whether fire location, help crew to carry out failture evacuation.Improve the reliability of fire-alarm, can effectively solve the wrong report phenomenon that the interference such as dust are caused by traditional photo-electric type smoke detector.It is applicable to various fire monitoring of different nature, can be widely used for factory, cockpit, pleasure boat, train, house, market etc..
Description
Technical field
The present invention relates to a kind of fire detector based on array gas sensor.More specifically one can be applicable to
Fire detector in aircraft passenger compartment, when not having clear and definite smog to occur.
Background technology
Currently, fire detector on the market mainly has a photo-electric type smoke detector of single detection particulate matter, and
The combined type detector that grain thing is combined with temperature.Siemens Company produces a kind of particulate matter, temperature and CO gas detecting recently
Combined type smoke detector, solve well photoelectric smoke detector wrong report s tri-sms lead higher problem.
When fire occurs, most situations have smog to produce, and are attended by multiple combustion product, such as CO, CO2, SO2
Deng gas.For the certain form of condition of a fire, there is no obvious smoke and produce, only discharge some gases, such as aircraft electrical part mistake
Heat, electronic device burns, and engine components are overheated.In these cases, above-mentioned detector and current aircraft use
Fire detector can not preferably complete task.The combined type smoke detector of Siemens Company, also can only detect smog and list
The CO gas of one, and other combustion product on aircraft just can't detect, the reliability causing the detection of fire is the highest, produces by mistake
Report and fail to report phenomenon.
Fire can be divided into A class, B class, C class, D class, E class according to the difference of comburant, produces when every class fire occurs
Gas is substantially the same, and small part is different.And existing single gas sensor tends not to distinguish to be which class material has caused fire
Calamity, this causes certain delay to fire rescue, if erroneous judgement, then consequence is hard to predict.Find fire the most accurately and in time
Calamity, is the problem of current fire detector needs solution.
Cockpit, the fire alarm system rate of false alarm of freight house are up to more than 90%.The reason causing wrong report is varied,
The wrong report caused such as dust, steam etc..It addition, in order to enable burning things which may cause a fire disaster type and comburant are had more specific deduction, thus
Fire location is positioned, it is desirable to have more accurate detection method.
Summary of the invention
Problem to be solved by this invention is to provide one and can detect multiple gases simultaneously, avoid false alarm and fail to report
Warn, judge fire type, the fire detector based on array gas sensor of location fire location.
To achieve these goals, the present invention adopts the technical scheme that a kind of fire based on array gas sensor of offer
Fire detector, wherein: fire detector structure based on array gas sensor is that this fire detector includes sensor die
Block, signal acquisition module, sensor assembly is resistor-type semiconductor array type gas sensor, the outfan of sensor array with
Signal acquisition module is connected, and forms the fire detector of array gas sensor.
The effect of the present invention is to reduce leakage alarm rate and alarm free rate.When occurring because of high temperature pyrolysis gas without substantially
During the fire alarm of smoke particle, conventional photoelectric smoke detector fails to report police because can't detect particulate matter, and the present invention passes through
Detection pyrolysis gas can provide correct alarm signal, thus reduces rate of failing to report.For causing because of the reason such as dust, steam
False fire alarm, the rate of false alarm of conventional photoelectric smoke detector is up to more than 90%.It is integrated with temperature sensor and CO passes
The combined type smoke detector of sensor can be greatly lowered rate of false alarm in this case；But owing to only detecting CO gas,
It is easily subject to disturb gas and false alarm occurs.Due to the fact that the testing result according to multiple gases carrys out comprehensive descision fire alarm letter
Breath, the reliability of its alarming result is far above the detection method only detecting a kind of gas.The present invention compared with other detection method,
Rate of false alarm reduces more than an order of magnitude.Compared with single gas sensor, multiple gases can be detected simultaneously, thus improve
Accuracy of detection, and judge, according to the concentration ratio of gas type and every kind of gas, the classification that fire occurs.By present invention fire
Fire detector, when cockpit, freight house, can be inferred burning or pyrolytic material type according to gas type, and then can determine whether
Fire location, helps crew to carry out failture evacuation.
Accompanying drawing explanation
Fig. 1 is the profile of the fire detector based on sensor array of the present invention；
Fig. 2 is the sensor array structure schematic diagram of the fire detector based on sensor array of the present invention；
Fig. 3 is the Sensor array circuit diagram of the fire detector based on sensor array of the present invention.
In figure:
2, metal semiconductor gas sensitive coating 3, heater strip 4, connection wire 5, shell 6, binding post 7, cylinder
Shape earthenware 8, SnO2 9、TiO210、WO311, the SnO of Pt, Au is mixed2 12、γ-Fe2O3 13、ZnO
Detailed description of the invention
Below in conjunction with the accompanying drawings the fire detector structure based on array gas sensor of the present invention is illustrated.
Gas described in the fire detector based on array gas sensor of the present invention refers to form the initial stage at fire
The gas discharged by comburant, referred to as fire target gas.Such as carbonaceous material discharges before fire is formed and in being formed
CO、CO2、CH4；Sulphur-containing substance release SO2；Itrogenous organic substance release NO etc..For different protection objects, it is possible to use different
Metal semiconductor gas sensor.Owing to dust and steam not containing object gas, the therefore fire detector of the present invention
The wrong report caused due to dust and steam can be effectively got rid of from principle.The fire based on sensor array of the present invention
Detector is one metal semiconductor gas array sensor of design.Its sensitive mechanism and the most conventional independent type electric resistance type half
Conductor gas sensor is similar to, and concrete grammar is to place between heater strip, earthenware outer surface etc. at hollow cylinder ceramic tube inside
Away from covering different metal semiconductor gas sensitives.Use resistor-type semiconductor array type gas sensor, by detection fire
The multiple gases produced after generation, identifies real fire, and then can determine whether original incendiary material.
The fire detector structure based on array gas sensor of the present invention is that this fire detector includes sensor
Module, signal acquisition module, sensor assembly is resistor-type semiconductor array type gas sensor, the outfan of sensor array
It is connected with signal acquisition module, forms the fire detector of array gas sensor.
Described resistor-type semiconductor array type gas sensor includes earthenware 7, metal semiconductor gas sensitive is coated with
Layer 2, heater strip 3, connection wire 4, shell 5 and binding post 6, described metal semiconductor gas sensitive coating 2 is multiple difference
Annular metal semi-conducting material, and be equidistantly covered in earthenware 7 outer surface, inside earthenware 7, place heater strip 3, add
Heated filament 3 two ends and each metal semiconductor gas sensitive coating 2 two ends connect by connecting wire 4, connect wire 4 and shell 5
On binding post 6 connect, binding post 6 is connected with described signal acquisition module.
The fire detector function based on array gas sensor of the present invention is achieved in that this fire detector master
Cylindrical ceramic tubes 7 to be included, metal semiconductor gas sensitive coating 2, heater strip 3, connection wire 4, shell 5 and binding post
6.Concrete grammar is placement heater strip 3 inside cylindrical ceramic tubes 7, and earthenware 7 outer surface equidistantly covers different metals
Semiconductor gas sensors material coating 2, such as SnO28、TiO29、WO310, the SnO of Pt, Au is mixed211、γ-Fe2O312, ZnO13 etc., thus
Forming array formula gas sensor, when making metal semiconductor gas sensitive coating 2, can add precious metals pt, Pd, Au
Deng.Every section of metal semiconductor gas sensitive is annular, and its edges at two ends is drawn and connected wire 4, can be equivalent between two wires
One resistance, connects wire 4 and is connected with the binding post 6 on shell 5, and binding post 6 is connected with described signal acquisition module.
After tested gas touches fire detector, the conductive characteristic of different metal semiconductor gas sensitive coatings changes,
Measured the change of equivalent resistance by test circuit, thus obtain the content of gas in fire hazard environment.
As shown in Figure 1 and Figure 2, embodiments of the present invention relate to fire detector based on sensor array.As at aircraft
Freight house, is arranged on each corner of aircraft cargo bay by fire detector based on sensor array.The foreign substances of aircraft, such as paper
Goods, lighter, drinks, cosmetics, plastic；The article of aircraft itself such as ornament materials, electromotor, fuel oil, electronics device
Part etc..These comburants are likely to initiation fire, and are attended by the generation of a large amount of gas.The big portion of gas that different comburants produce
Split-phase is same, and only trace is different.Abundant burning as insufficient in fuel oil can produce CO2, H2O, a small amount of CO, SO2, NO, and itself
Material propane etc.；Igelite product burns can decomposite HCI gas；The overheated burning of nylon wire cable can produce in a large number
CO2, CO and a small amount of HCN gas；The overheated meeting of circuit board decomposites CO, H2、CO2Deng.
In the present embodiment, choose CO, NO, HCI, H2, propane, six kinds of gases of ethanol are measurand, each metal
Semiconductor gas sensors material is higher to one of which gas sensitivity.Wherein, SnO2Sensor has higher sensitivity to CO；TiO2
The sensitiveest to NO；WO3Sensor is high to HCI gas sensitization degree；Mix the SnO of Pt, Au2Sensor can improve the sensitivity to H2；
γ-Fe2O3Propane is had higher sensitivity；ZnO is sensitiveer to alcohol gas.
In the present embodiment, as in figure 2 it is shown, six kinds of gas sensitives are respectively SnO28、TiO29、WO310, Pt, Au are mixed
SnO211、γ-Fe2O312、ZnO13.The equivalent resistance of six kinds of metal semiconductor gas sensitives is respectively RS1, RS2, RS3, RS4,
RS5, RS6, the heater strip resistance in earthenware 7 is Rh.Configure six divider resistance RL1, RL2, RL3, RL4, RL5, RL6, may be constructed
Basic measuring circuit, as shown in Figure 3.Signal acquisition module uses a single-chip microcomputer being integrated with multichannel a/d converter.This
Invention is concrete uses the MSP430F149 low-power scm with 8 Channel 12-Bit a/d converter.During work, execute to heater strip 3
Making alive VH, to the applying voltage V of measuring circuitC.When aircraft cargo bay breaking out of fire, produced gas with various concentration information
Be converted to different magnitudes of voltage by sensor array, after a/d converter gathers, single-chip microcomputer gas concentration signal carried out point
Analysis, it can be determined that the gaseous species in fire, thus it is speculated that be which kind of comburant initiation fire such that it is able to it is fixed to carry out fire location
Position, helps crew to fix a breakdown.As the fuel oil on aircraft is revealed, burn incompletely can produce CO2, H2O, a small amount of CO,
SO2, NO and material propane own etc..In the present embodiment, after these gases contact with fire detector, corresponding gas sensitive
SnO28、TiO29、γ-Fe2O312 electric conductivity can change, and measures the change of equivalent resistance by test circuit, thus simultaneously
Record the content of CO in fire hazard environment, NO, propane.
These embodiments are merely to illustrate the present invention but do not limit to the scope of the present invention processed.As long as have employed the side of the present invention
The improvement of various unsubstantialities that method design and technical scheme are carried out, or the most improved design by the present invention and technical scheme straight
Connect for other occasions, all within protection scope of the present invention.
Claims (2)
1. a fire detector based on array gas sensor, is characterized in that: this fire detector includes sensor die
Block and signal acquisition module, sensor assembly is resistor-type semiconductor array type gas sensor, the outfan of sensor array
It is connected with signal acquisition module, forms the fire detector of array gas sensor.
Fire detector based on array gas sensor the most according to claim 1, is characterized in that: described resistor-type
Semiconductor array type gas sensor includes earthenware (7), metal semiconductor gas sensitive coating (2), heater strip (3), connects
Connecing wire (4), shell (5) and binding post (6), described metal semiconductor gas sensitive coating (2) is multiple different ring-type
Metal semiconductor material, and equidistantly it is covered in earthenware (7) outer surface, at earthenware (7) internal placement heater strip (3), add
Heated filament (3) two ends and each metal semiconductor gas sensitive coating (2) two ends connect by connecting wire (4), connect wire (4)
Being connected with the binding post (6) on shell (5), binding post (6) is connected with described signal acquisition module.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201610576388.9A CN106128004A (en) | 2016-07-19 | 2016-07-19 | Fire detector based on array gas sensor |
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|---|---|---|---|
| CN201610576388.9A CN106128004A (en) | 2016-07-19 | 2016-07-19 | Fire detector based on array gas sensor |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107884454A (en) * | 2017-11-29 | 2018-04-06 | 桂林理工大学 | A kind of integrated form carbon monoxide and nitrogen dioxide gas detector |
| CN108169425A (en) * | 2017-12-26 | 2018-06-15 | 桂林理工大学 | For monitoring the gas sensor and detection method of CO, NO2 content in alcohol-based fuel tail gas in real time |
| CN112509271A (en) * | 2020-11-25 | 2021-03-16 | 中国民用航空飞行学院 | Millimeter wave smoke-sensing detection device and detection method thereof |
| CN113137579A (en) * | 2020-08-26 | 2021-07-20 | 西安天和防务技术股份有限公司 | Wisdom street lamp and thing networking platform |
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| CN101149354A (en) * | 2007-10-26 | 2008-03-26 | 华中科技大学 | Gas sensitization array sensor and its manufacture method |
| CN201069439Y (en) * | 2006-12-21 | 2008-06-04 | 广州大学 | Coating ammonia sensor |
| CN201408467Y (en) * | 2009-04-15 | 2010-02-17 | 北京嘉东科技有限公司 | Intelligent fire alarm system |
| CN202330343U (en) * | 2011-12-02 | 2012-07-11 | 济南大学 | Acetone gas sensor detection device |
| CN104931540A (en) * | 2014-03-20 | 2015-09-23 | 中国科学院大连化学物理研究所 | Gas sensor array and preparation method thereof |
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Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
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| RU2137199C1 (en) * | 1997-12-22 | 1999-09-10 | Смирнов Юрий Сергеевич | Detector for gas fire alarm equipment |
| CN201069439Y (en) * | 2006-12-21 | 2008-06-04 | 广州大学 | Coating ammonia sensor |
| CN101149354A (en) * | 2007-10-26 | 2008-03-26 | 华中科技大学 | Gas sensitization array sensor and its manufacture method |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107884454A (en) * | 2017-11-29 | 2018-04-06 | 桂林理工大学 | A kind of integrated form carbon monoxide and nitrogen dioxide gas detector |
| CN108169425A (en) * | 2017-12-26 | 2018-06-15 | 桂林理工大学 | For monitoring the gas sensor and detection method of CO, NO2 content in alcohol-based fuel tail gas in real time |
| CN113137579A (en) * | 2020-08-26 | 2021-07-20 | 西安天和防务技术股份有限公司 | Wisdom street lamp and thing networking platform |
| CN112509271A (en) * | 2020-11-25 | 2021-03-16 | 中国民用航空飞行学院 | Millimeter wave smoke-sensing detection device and detection method thereof |
| CN112509271B (en) * | 2020-11-25 | 2024-03-22 | 中国民用航空飞行学院 | Millimeter wave smoke sensing detection device and detection method thereof |
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Application publication date: 20161116 |