CN101866524B - Linear infrared beam smoke fire detector and detection method thereof - Google Patents
Linear infrared beam smoke fire detector and detection method thereof Download PDFInfo
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Abstract
The invention discloses a linear infrared beam smoke fire detector and a detection method thereof, and belongs to the technical field of fire detection. The detector of the invention comprises an infrared receiver and an infrared transmitter, and the luminous control signal output end of the infrared receiver is connected with the signal receiving end of the infrared transmitter by using a lead so that the luminous state of the infrared transmitter is controlled by the infrared receiver to realize synchronous infrared beam transmitting/receiving of the linear infrared beam smoke fire detector. The detection method for the detector comprises the following steps of: operating a 4bit dial switch on the transmitter on site, and setting the detectable distance of the detector; transmitting luminous communication command to the transmitter by the receiver, emitting light for 0.1mS by the transmitter, and synchronously acquiring a current light intensity comprehensive value by the receiver; obtaining a current smoke detection value by adopting a light interference removing method; and performing initial value compensation every four hours, and automatically selecting a proper fire alarm threshold judgment value according to the size of the initial value of the detector to perform fire judgment.
Description
Technical field:
The invention belongs to the fire detection technology field, particularly relate to a kind of linear infrared beam smoke fire detector and detection method thereof.
Background technology:
Linear infrared beam smoke fire detector is the smokescope that is diffused into beam area when taking place through detection of fires; Reach the effect of fire initial stage automatic detection alarm, protection safety of life and property; It has that the protection area is big, the installation site is than advantages such as height, is suitable for protecting the place, indoor and outdoor of large space.But existing linear infrared beam smoke fire detector still exists two big general character defectives in practical applications: 1, anti-light interference performance is relatively poor: under ambient light interference such as incandescent lamp, xenon lamp and sunshine, be prone to wrong report or forfeiture detection ability; In the practical application in order to reduce the rate of false alarm of detector; Usually take the way that makes detector be operated in the over-saturation district or too reduce detector sensitivity; Make it when can not reporting to the police by early detection during breaking out of fire in the protection zone; Even breaking out of fire fails to report accident, and this way of sacrificing reliability in order to reduce rate of false alarm has been brought very big hidden danger to security against fire.2, when detection range surpasses 100m, detector warning sensitivity decline occurs even fails to report the realistic problem of fire alarm.Develop rapidly along with China's economic construction; The volumed space building place that some play an important role in national economy and social life (like large-scale telecommunication apparatus machine room, computer room, integrated circuit workshop, banking system, large-scale power station, library, bulk storage plant, hangar, cinema, museum, gymnasium, exhibition center, subway, hospital, market, communal space hall etc.) is more and more, and the popular feature in this type of building place is that spatial extent is big, the height of a house is high; And for energy-conserving and environment-protective; In the buildings daytime take usually in Room formula glass printing opacity roof natural lighting mode; Then use lighting systems such as the vehement lamp of various bright whites, xenon lamp, shot-light, searchlight night, be installed on the interference that the linear infrared beam smoke fire detector of these buildings in places unavoidably will receive these environment light sources.Therefore, press for the linear infrared beam smoke fire detector that has remote detection ability and can overcome various ambient light interference influences, to be applicable to the detection requirement in special building places such as modern large space.
Summary of the invention:
Be subject to ambient light interference, problem that detection range is little to what existing linear infrared beam smoke detector existed in use in large public building place in the past; The present invention provides a kind of interference that overcomes surround lighting, and effective detection range is widened is the linear infrared beam smoke fire detector and the detection method thereof of 1～200m scope.
To achieve these goals; The present invention adopts following technical scheme; A kind of linear infrared beam smoke fire detector; Comprise infrared remote receiver and infrared transmitter, 2 supply terminalss of infrared remote receiver are connected with the DC24V power supply respectively, and the status signal output terminal of infrared remote receiver is connected with signal source; The led control signal output terminal of infrared remote receiver is connected with the signal receiving end of infrared transmitter, and 1 supply terminals of infrared transmitter is connected with the 0V power lead of DC24V power supply.
In the inner luminous intensity circuit for regulating and controlling of said infrared transmitter, be provided with 4 toggle switchs.
The detection method of said linear infrared beam smoke fire detector comprises the steps:
Step 1: according to detection range and 4 toggle switch states 4 toggle switchs on the mapping table execute-in-place transmitter are set, the detectable distance of detector is set;
Step 2: carry out power-up initializing;
Step 3: judge whether 1 second time has arrived at interval, if, then change and go execution in step five, if not, then execution in step four;
Step 4:, and return execution in step three by receiver sampling environment light intensity value;
Step 5: transmit luminous communications command to transmitter by receiver;
Step 6: the luminous 0.1mS of transmitter, receiver synchronous acquisition current light intensity comprehensive value Xn;
Step 7: adopt the light interference removing method to draw smoke detection currency Yn;
Step 8: judge whether 4 hours initial value compensation time arrived at interval, if not, then change and go execution in step 11, if then execution in step nine;
Step 9: whether the absolute value of judging the difference of smoke detection currency Yn and smoke detection initial value Yo is less than or equal to sense cigarette initial value compensation judgment value, if then execution in step ten, if not, then changes and goes execution in step 11;
Step 10: give smoke detection initial value Yo with smoke detection currency Yn assignment;
Step 11: draw current fire alarm thresholding judgment value Yb according to detector initial value division methods and fire alarm thresholding judgment value mapping table;
Step 12: whether the difference of judging smoke detection initial value Yo and smoke detection currency Yn is more than or equal to current fire alarm thresholding judgment value Yb, if then execution in step 14 is gone in commentaries on classics, if not, then execution in step 13;
Step 13: make the counting zero clearing of continuous coincidence counting K, change and go execution in step 16;
Step 14: whether judge continuous coincidence counting K=K+1 more than or equal to 6,, if not, then change and go execution in step 16 if then execution in step 15;
Step 15: put the fire alarm state, and change and go execution in step three;
Step 10 six: put the normal monitoring state, and change and go execution in step three.
Beneficial effect of the present invention:
1. overcome the interference of surround lighting:
Detector of the present invention transmits and receives infrared beam and takes synchro control examination technology, can effectively discern external ambient light (daylight and light) and self infrared light; Make detector (like periods of direct sunlight detector receiving plane) under superpower ambient light interference never report by mistake and fail to report, and the fire hazard aerosol fog detection sensitivity is unaffected.
2. widened detection range:
The detection range of detector of the present invention is 1m～200m, maximum response threshold value Amax in 1m～200m detection range scope and ratio Amax/Amin≤1.4 of minimum response threshold value Amin; And have and to expand detection range to 200m with potentiality far away.
3. have dust accumulation automatic compensation function:
Detector of the present invention can compensate the drift of smoke detection initial value automatically, in use can not cause wrong report to luminous with dust that receives slow accumulation on the minute surface or fume pollution etc., and makes the fire hazard aerosol fog detection sensitivity keep invariable.
4. various smog there is good balanced sensitive response performance:
Applied environment and fire information database according to the detector of having set up of the present invention; Through data mining; Work out a kind of effective signal processing technology and intelligent decision fire method, make detector of the present invention good balanced sensitive response performance arranged various smog to this detector.
5. satisfying national standard requires:
Detector of the present invention satisfies the requirement of standard GB 14003-2005 " line style light beam smoke fire detector ".
6. have good cost performance:
The detector of the present invention only promptly more domestic similar detector of components and parts cost of detection circuit reduces about 35～80 yuan, and other structural member remains basically stable with domestic similar detector average unit cost.
Detector general technical level of the present invention and combination property have reached the earlier 2000s international most advanced level; A kind of fire detecting and alarm New Product of urgent need will be provided for China's super large space building place security against fire; To reducing the loss of fire; Safeguard people's lives and properties, defendance economic construction will be played significant role.Its operation and applying not only can be satisfied the active demand of domestic complicated building to security against fire, and also alternative imported product for country saves a large amount of foreign exchanges, will produce the significant social economic benefit.
Description of drawings:
Fig. 1 is a detector wiring working method synoptic diagram of the present invention;
Fig. 2 is detector synchronized transmissions of the present invention and the Control on Communication oscillogram that receives infrared light;
Fig. 3 is the circuit theory diagrams of the infrared transmitter luminous intensity circuit for regulating and controlling of detector of the present invention;
Fig. 4 is the program flow diagram of the detection method of detector of the present invention;
Among Fig. 1,1-infrared remote receiver, 2-infrared transmitter.
Embodiment:
As shown in Figure 1; A kind of linear infrared beam smoke fire detector; Comprise infrared remote receiver 1 and infrared transmitter 2; The 2nd pin of infrared remote receiver 1, the 3rd pin are connected with 24V power lead, the 0V power lead of DC24V power supply respectively, and the 1st pin of infrared remote receiver 1 is connected with the signal wire S that is connected with signal source; The 4th pin of infrared remote receiver 1 is connected with the 2nd pin of infrared transmitter 2, and the 1st pin of infrared transmitter 2 is connected with the 0V power lead.
As shown in Figure 3, in the luminous intensity circuit for regulating and controlling of said infrared transmitter 2 inside, be provided with 4 toggle switch BK4.The concrete annexation of the luminous intensity circuit for regulating and controlling of said infrared transmitter is following:
The control output end mouth RC4 of single-chip microcomputer U2 is connected with the base stage of the first triode T1 through the 6th resistance R 6; The emitter of T1 is connected with the base stage of the second triode T2; The collector of T1, T2 is connected with the negative pole of infraluminescence pipe LED1, and the positive pole of LED1 is connected with power supply VCC.The emitter one tunnel of T2 is connected with ground through first resistance R 1, second resistance R 2, the 3rd resistance R 3, the 4th resistance R 4, the 5th resistance R 5 successively; Another road is connected with an end of first K switch 1 of 4 toggle switch BK4, and the other end of K1 is connected with the intermediate node of R1, R2; The end of the second switch K2 of BK4 is connected with the intermediate node of R1, R2, and the other end of K2 is connected with the intermediate node of R2, R3; One end of the 3rd K switch 3 of BK4 is connected with the intermediate node of R2, R3, and the other end of K3 is connected with the intermediate node of R3, R4; One end of the 4th K switch 4 of BK4 is connected with the intermediate node of R3, R4, and the other end of K4 is connected with the intermediate node of R4, R5.
As shown in Figure 4, the detection method of said linear infrared beam smoke fire detector comprises the steps:
Step 1: according to detection range and 4 toggle switch states 4 toggle switchs on the mapping table execute-in-place transmitter are set, the detectable distance of detector is set;
Step 2: carry out power-up initializing;
Step 3: judge whether 1 second time has arrived at interval, if, then change and go execution in step five, if not, then execution in step four;
Step 4:, and return execution in step three by receiver sampling environment light intensity value;
Step 5: transmit luminous communications command to transmitter by receiver;
Step 6: the luminous 0.1mS of transmitter, receiver synchronous acquisition current light intensity comprehensive value Xn;
Step 7: adopt the light interference removing method to draw smoke detection currency Yn;
Step 8: judge whether 4 hours initial value compensation time arrived at interval, if not, then change and go execution in step 11, if then execution in step nine;
Step 9: whether the absolute value of judging the difference of smoke detection currency Yn and smoke detection initial value Yo is less than or equal to sense cigarette initial value compensation judgment value, if then execution in step ten, if not, then changes and goes execution in step 11;
Step 10: give smoke detection initial value Yo with smoke detection currency Yn assignment;
Step 11: draw current fire alarm thresholding judgment value Yb according to detector initial value division methods and fire alarm thresholding judgment value mapping table;
Step 12: whether the difference of judging smoke detection initial value Yo and smoke detection currency Yn is more than or equal to current fire alarm thresholding judgment value Yb, if then execution in step 14 is gone in commentaries on classics, if not, then execution in step 13;
Step 13: make the counting zero clearing of continuous coincidence counting K, change and go execution in step 16;
Step 14: whether judge continuous coincidence counting K=K+1 more than or equal to 6,, if not, then change and go execution in step 16 if then execution in step 15;
Step 15: put the fire alarm state, and change and go execution in step three;
Step 10 six: put the normal monitoring state, and change and go execution in step three.
Described detection range and 4 toggle switch states are provided with mapping table, as follows:
Table 1: detection range and 4 plucking number sign switch states are provided with mapping table
| Detection range (m) | 1≤M≤10 | 10＜M≤50 | 50＜M≤100 | 100＜M≤150 | 150＜M≤200 |
| 4 plucking number sign switch states are provided with | K1=opens, and K2=opens K3=and opens, and K4=opens | K1=closes, and K2=opens K3=and opens, and K4=opens | K1=closes, and K2=closes K3=and opens, and K4=opens | K1=closes, and K2=closes K3=and closes, and K4=opens | K1=closes, and K2=closes K3=and closes, and K4=closes |
| LED1 current-limiting resistance value (Ω) | 3638 | 688 | 128 | 28 | 8 |
Described detector initial value division methods and fire alarm thresholding judgment value mapping table, as follows:
Table 2: detector initial value division methods and fire alarm thresholding judgment value mapping table
Described smooth interference removing method is shown in following formula:
1) if: Gn >=60, and: Xn >=(Gn-10)/2,
Then: Yn=Xn-(Gn-10)/2;
2) if: Gn >=60, and: Xn＜(Gn-10)/2,
Then: Yn=0;
3) if: Gn＜60, Xn >=220,
Then: Yn=Xn;
4) if: Gn＜60,120≤Xn＜220,
Then: Yn=Xn-Gn;
5) if: Gn＜60, Xn＜120, and: Xn >=1.5Gn,
Then: Yn=Xn-1.5Gn;
6) if: Gn＜60, Xn＜120, and: Xn＜1.5Gn,
Then: Yn=0;
Wherein, Gn is the sample arithmetic mean of 48 secondary environment light intensities of current per second,
Xn is current light intensity comprehensive value (containing surround lighting coupling composition);
Yn is smoke detection currency (having rejected surround lighting coupling composition);
G (x) is an ambient light intensity value current the 1st, 2,3.......48 sampling.
Detector of the present invention utilizes smoke particle that the principle that infrared beam has absorption and attenuation is carried out early detection to fire, and the infrared beam of infrared transmitter emission arrives infrared remote receiver through guard space; When the condition of a fire, the smog that substance combustion produces is diffused into beam area, and the infrared beam strength signal that infrared remote receiver is received is decayed, and when the infrared beam strength signal decayed to setting value, infrared remote receiver sent fire alarm signal.Detector of the present invention efficiently solves an anti-ambient light interference of linear infrared beam smoke fire detector and remote detection two big key practical applications difficult problems.
1, anti-ambient light interference:
Conventional linear infrared beam smoke fire detector can't be discerned external environment light and self infrared light, is the reason place of causing the anti-ambient light interference ability of this detector relatively poor.Detector of the present invention has been taked synchronized transmissions and has been received the examination technology of infrared electro signal, for effectively identification external ambient light and self infrared light have been created condition precedent.As shown in Figure 1, detector of the present invention is connected with the 2nd pin of infrared transmitter with the 4th pin of 1 lead with infrared remote receiver, working power is provided and transmits the carrier wave led control signal to infrared transmitter by infrared remote receiver; The luminance of infrared transmitter is controlled by infrared remote receiver, and the infrared remote receiver per second is to the luminous communications command of infrared transmitter transmission primaries; Receive the luminous communications command of infrared remote receiver when infrared transmitter after, promptly launch the infrared light that pulsewidth is 0.1mS, infrared remote receiver receives the infrared light strength signal that infrared transmitter sends synchronously; In addition, the ambient light intensity in place, No. 48 detectors places of the time continuous sampling of infrared remote receiver beyond the 0.1mS/S, and self infrared light and external environment light intensity signal stored respectively.The detector synchronized transmissions is as shown in Figure 2 with reception infrared communication control waveform.
After having taked technique scheme, though infrared remote receiver of the present invention can be gathered self infrared light and external environment light signal in real time; But between the infrared transmitter light emission period, the infrared remote receiver synchronous acquisition to light intensity signal in various degree the coupling composition that contains external environment light still, and the coupling composition of this surround lighting is nonlinearities change, is not can reject with simple algorithm.To this; Through the daylight that on linear infrared beam smoke fire detector data acquisition test platform, carries out, various light and mixed light interference test thereof; And set up light interfering data storehouse; In-depth analysis and rule based on to light interfering data storehouse are excavated; Detector utilization fuzzy logic mathematical model of the present invention has been established light interference removing method, and this method can effectively be rejected the coupling composition of ambient light interference, and true source is purified out from the infrared beam smoke detection signal of infrared transmitter.
Through taking above two kinds of technical schemes; Can effectively reject ambient light interference coupling composition; Make the anti-ambient light interference of detector of the present invention very competent; Guaranteed that detector of the present invention do not report by mistake under disturbing in that sunshine and various light are strong, and made the smoke detection warning sensitivity unaffected.
2, widen detection range:
The conventional common maximum detectable range of linear infrared beam smoke fire detector is less than 100m; When such conventional detector is used for being surpassed the super large space building more than 100 meters by guard space length; Exist fluctuation of service, smoke sentivity decline; Even the defective that fire is not reported to the police appears, can not satisfy of the requirement of super large space building to remote detection.
Air dielectric is that the infrared light of 0.800 μ m has certain attenuation to wavelength, so the infrared beam that infrared transmitter sends is decayed by air dielectric along with the prolongation of detection range gradually, the infrared light intensity that arrives infrared remote receiver is successively decreased.Exist very big-difference owing to be installed in the detection range of linear infrared beam smoke fire detector in protection place, therefore, the luminous intensity of infrared transmitter is had corresponding change requirement.The detection range luminous intensity of infrared transmitter that then requires far away is strong more, otherwise, nearlyer corresponding the weakening of luminous intensity that then requires infrared transmitter of detection range.In order to address this problem; Detector of the present invention is in the luminous intensity circuit for regulating and controlling of infrared transmitter; Change the current-limiting resistance value of infraluminescence pipe LED1 with the multiple assembled state of closure/disconnection of 4 toggle switchs, play the effect of regulating infraluminescence pipe LED1 luminous intensity.Infrared transmitter luminous intensity circuit for regulating and controlling is as shown in Figure 3; It is as shown in table 1 that detection range and 4 plucking number sign switch states are provided with corresponding relation; Can detection range be set flexibly according to field condition; Thereby satisfied linear infrared beam smoke fire detector because of the demands of different of protection place detection range difference to the infrared transmitter luminous intensity, it is 1～200m scope that the effective detection range of detector of the present invention is widened.
Carry out the test of optical path length dependence through linear infrared beam smoke fire detector to routine; Show: adopt of the prolongation of the linear infrared beam smoke fire detector of fixing alarm threshold routine fire determination methods along with detection range; Smoke sentivity is on a declining curve, and particularly when detection range surpassed 100m, the smoke sentivity of detector descended particularly evident; If it is improper that fire alarm thresholding judgment value is provided with; The one, be prone to report by mistake, the 2nd, possibly fail to report fire alarm, the detection reliability there is very big influence.
Detector of the present invention has been abandoned and has been adopted the fixedly conventional fire determination methods of alarm threshold in the past, takes to select according to the size of detector initial value the fire determination methods of different alarm thresholds.Detector initial value Yo division methods and fire alarm thresholding judgment value corresponding relation are as shown in table 2; That is: the initial value with detector is divided into some sections; And select appropriate fire alarm thresholding judgment value Yb respectively according to the initial value section of detector; The initial value of detector is big more, and the fire alarm thresholding judgment value of then selecting is big more; Otherwise the initial value of detector is more little, and the fire alarm thresholding judgment value of then selecting is just more little.Detector of the present invention is solidificated in " detector initial value division methods and fire alarm thresholding judgment value corresponding relation " in the table 2 programming in the single-chip microcomputer of detector; Make detector of the present invention select appropriate fire alarm thresholding judgment value according to the size of detector initial value automatically; Judge fire, cause the problem that smoke detection sensitivity changes thereby solved because of detection range difference.
Optical path length dependence according to table 2 pair linear infrared beam smoke fire detector of the present invention carries out is tested; Gratifying result occurred: 10m, 50m, 100m, 150m, 200m place carry out optical filter and block the test of reporting to the police respectively at detection range; Warning dim light value A is respectively 2.8,2.8,2.5,2.5,2.6, the maximum response threshold value of its optical path length dependence test and the ratio A of minimum response threshold value
Max: A
MinBe 1.12＜1.6, satisfied the related request of stipulating among national standard " the line style light beam smoke fire detector " GB14003-2006 preferably.
Above technical scheme has fully been widened the detection range of detector of the present invention; Make the more similar conventional detector of detection range increase 1 times; Effective detection range is expanded as the scope of 1～200m; And can detection range be set flexibly according to field condition, make it to be applicable to building places such as super large space.
Above technical scheme is not only applicable to correlation line style light beam smoke fire detector, equally is applicable to reflective line style light beam smoke fire detector yet.
Claims (4)
1. the detection method of a linear infrared beam smoke fire detector; Said detector comprises infrared remote receiver and infrared transmitter; 2 supply terminalss of infrared remote receiver are connected with the DC24V power supply respectively, and the status signal output terminal of infrared remote receiver is connected with signal source; The led control signal output terminal of infrared remote receiver is connected with the signal receiving end of infrared transmitter, and 1 supply terminals of infrared transmitter is connected with the 0V power lead of DC24V power supply; In the inner luminous intensity circuit for regulating and controlling of said infrared transmitter, be provided with 4 toggle switchs; It is characterized in that said detection method comprises the steps:
Step 1: according to detection range and 4 toggle switch states 4 toggle switchs on the mapping table execute-in-place transmitter are set, the detectable distance of detector is set;
Step 2: carry out power-up initializing;
Step 3: judge whether 1 second time has arrived at interval, if, then change and go execution in step five, if not, then execution in step four;
Step 4:, and return execution in step three by receiver sampling environment light intensity value;
Step 5: transmit luminous communications command to transmitter by receiver;
Step 6: the luminous 0.1mS of transmitter, receiver synchronous acquisition current light intensity comprehensive value Xn;
Step 7: adopt the light interference removing method to draw smoke detection currency Yn;
Step 8: judge whether 4 hours initial value compensation time arrived at interval, if not, then change and go execution in step 11, if then execution in step nine;
Step 9: whether the absolute value of judging the difference of smoke detection currency Yn and smoke detection initial value Yo is less than or equal to sense cigarette initial value compensation judgment value, if then execution in step ten, if not, then changes and goes execution in step 11;
Step 10: give smoke detection initial value Yo with smoke detection currency Yn assignment;
Step 11: draw current fire alarm thresholding judgment value Yb according to detector initial value division methods and fire alarm thresholding judgment value mapping table;
Step 12: whether the difference of judging smoke detection initial value Yo and smoke detection currency Yn is more than or equal to current fire alarm thresholding judgment value Yb, if then execution in step 14 is gone in commentaries on classics, if not, then execution in step 13;
Step 13: make the counting zero clearing of continuous coincidence counting K, change and go execution in step 16;
Step 14: whether judge continuous coincidence counting K=K+1 more than or equal to 6.,, if not, then change and go execution in step 16 if then execution in step 15;
Step 15: put the fire alarm state, and change and go execution in step three;
Step 10 six: put the normal monitoring state, and change and go execution in step three.
2. the detection method of a kind of linear infrared beam smoke fire detector according to claim 1 is characterized in that, described detection range and 4 toggle switch states are provided with mapping table, as follows:
3. the detection method of a kind of linear infrared beam smoke fire detector according to claim 1 is characterized in that, described detector initial value division methods and fire alarm thresholding judgment value mapping table, as follows:
4. the detection method of a kind of linear infrared beam smoke fire detector according to claim 1 is characterized in that, described smooth interference removing method is following:
1) if: Gn >=60, and: Xn >=(Gn-10)/2,
Then: Yn=Xn-(Gn-10)/2;
2) if: Gn >=60, and: Xn＜(Gn-10)/2,
Then: Yn=0;
3) if: Gn＜60, Xn >=220,
Then: Yn=Xn;
4) if: Gn＜60,120≤Xn＜220,
Then: Yn=Xn-Gn;
5) if: Gn＜60, Xn＜120, and: Xn >=1.5Gn,
Then: Yn=Xn-1.5Gn;
6) if: Gn＜60, Xn＜120, and: Xn＜1.5Gn,
Then: Yn=0;
Wherein, Gn is the sample arithmetic mean of 48 secondary environment light intensities of current per second,
Xn is the current light intensity comprehensive value that contains surround lighting coupling composition;
Yn is the smoke detection currency of having rejected surround lighting coupling composition;
G (x) is an ambient light intensity value current the 1st, 2,3.......48 sampling.
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| DE102013208533A1 (en) * | 2013-05-08 | 2014-11-13 | Robert Bosch Gmbh | fire alarm |
| CN106442252A (en) * | 2016-08-31 | 2017-02-22 | 广东美的制冷设备有限公司 | Method and system for detecting filth blockage in dust filtration mesh for filtering ambient light and household appliances |
| CN106781338B (en) * | 2017-02-23 | 2022-03-18 | 应急管理部沈阳消防研究所 | Optical self-inspection line type light beam smoke-sensing fire detector and field self-inspection method |
| CN107516397B (en) * | 2017-09-28 | 2023-04-07 | 深圳市泰和安科技有限公司 | Photoelectric smoke detector |
| CN110276927A (en) * | 2018-03-16 | 2019-09-24 | 科航（苏州）信息科技有限公司 | One kind is shed with water proof type infrared light smoke detector |
| CN110208185A (en) * | 2018-08-21 | 2019-09-06 | 华帝股份有限公司 | Detection circuit for detecting smoke concentration by infrared and detection method thereof |
| CN110021137A (en) * | 2019-03-28 | 2019-07-16 | 赛特威尔电子股份有限公司 | A kind of smog alarm method, apparatus, smoke alarm device and storage medium |
| CN113794862B (en) * | 2021-09-13 | 2022-05-27 | 无锡联友塑业有限公司 | Water quantity correction platform using visual monitoring |
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| CN2319868Y (en) * | 1997-09-30 | 1999-05-19 | 南京消防(集团)公司 | Intelligent point-type photoelectric smoke sensing compound fire disaster detector |
| CN2624304Y (en) * | 2003-05-10 | 2004-07-07 | 河北科技大学 | Large space fire detector |
| CN2779384Y (en) * | 2005-01-07 | 2006-05-10 | 上海捷耐瑞智能科技有限公司 | Laser beam smoke detector |
| CN201278184Y (en) * | 2008-10-17 | 2009-07-22 | 无锡蓝天电子有限公司 | Improved independent smoke sensing fire disaster probing alarm |
| CN101504790B (en) * | 2008-11-07 | 2010-12-22 | 清华大学 | Infrared beam type fire disaster smoke detector and detecting method thereof |
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