CN101383075B - Ultra-violet and infrared composite flame detecting alarm having optical self-checking function and method thereof - Google Patents
Ultra-violet and infrared composite flame detecting alarm having optical self-checking function and method thereof Download PDFInfo
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- CN101383075B CN101383075B CN 200810228237 CN200810228237A CN101383075B CN 101383075 B CN101383075 B CN 101383075B CN 200810228237 CN200810228237 CN 200810228237 CN 200810228237 A CN200810228237 A CN 200810228237A CN 101383075 B CN101383075 B CN 101383075B
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Abstract
The invention relates to an alarm and a method for detecting ultraviolet-infrared composite flame, and the alarm has the optical self-detection function and is characterized in that an infrared LED (Light-Emitting Diode) is connected with a band-pass amplifier circuit, and an ultraviolet LED and an ultraviolet photoelectric detection tube are connected with an intelligent ultraviolet driving and signal sampling circuit; the output end of a conversion circuit of a detector power supply is connected with an ultraviolet extraction and conversion circuit, and the output end of the intelligent ultraviolet driving and signal sampling circuit is connected with a main processing circuit of detector data; the output ends of an detector external signal input detection and self-detection infrared LED drive circuit and the main processing circuit of detector data are connected with the band-pass amplifier circuit, and the output ends of the main processing circuit of detector data and the conversion circuit of a detector power supply are connected a 485 communication circuit of a detector isolation power supply, an output circuit of detector 4-20 mA signals and an output circuit of a detector relay. The invention has the advantages that flame signals are judged through ultraviolet-infrared mixture, decreases an error alarm rate, and improves the suitability of a detector to a use environment so as to achieve a higher intelligence degree.
Description
Technical field
The invention belongs to the automatic fire detection-alarm field, particularly a kind of optical self-checking function ultra-violet and infrared composite flame detecting alarm and method of having.
Background technology
In early days; use plain type ultraviolet or single band infrared flame detector means in the world as protection large space and hypogee security against fire; but because it is subjected to the restriction of technical merit and technological level, relatively poor to the resistivity of environmental interference in actual applications, easily produce false alarm.In recent years, somebody's research and utilization CCD imaging combustion technology was surveyed flame both at home and abroad, because the fundamental research that corresponding incipient fire image is surveyed is still insufficient, had limited the development of fire image technology to a certain extent.Therefore, countries such as Japan, Switzerland successively develop and successfully use bi wave band infra red flame detector to be used for the security against fire protection of large space and hypogee in recent years.It can further suppress the interference of environmental interference signal, improves the reliability of detector, becomes to protect last word underground and the volumed space building security against fire.
Develop rapidly along with China's economic construction, the quantity of volumed space building and hypogee constantly increases, as large-scale place of public amusement, bulk storage plant, large-scale country fair, hangar, garage, oil depot, waiting hall and marquis's machine hall, subterranean tunnel, subway station road, underground large parking lot and subterranean commercial area etc.Because this type of building interior often height of a house height, span is big, it is bigger that the cigarette diffusion of fire initial stage is influenced by air-conditioning that building interior installs and ventilating system etc., the place personnel that have are intensive, and inflammable thing are many, and disaster hidden-trouble is many, and this type of building fire spreads rapidly, the generation flue gas toxity is big, and evacuating personnel is taken refuge and reinforced the difficulty of putting out a fire to save life and property, in case breaking out of fire often causes very big economic loss and abominable social influence, therefore, underground and volumed space building has become one of key object of fire-fighting defendance.
The singularity of underground and volumed space building, common some type sense cigarette, temperature-sensing fire detecting warning system can't be gathered the cigarette temperature change information that fire sends rapidly, thereby are difficult to the requirement satisfying early detection and forecast this type of building fire.Use plain type ultraviolet, single band infrared flame detector as the means of protecting volumed space building in the world in early days, but because it is subjected to the restriction of technical merit and technological level, relatively poor to the inhibition ability of environmental interference in actual applications, be easy to generate false alarm.
Summary of the invention
Problem at the prior art existence, the invention provides a kind of ultra-violet and infrared composite flame detecting alarm and method that has optical self-checking function, comprehensively adopt two information sensing technology of flame ultraviolet and infrared spectrum model, two kinds of wave band optimisation techniques and comprehensive fire identification software algorithm.
The ultra-violet and infrared composite flame detecting alarm that has optical self-checking function of the present invention comprises ultraviolet protection eyeglass, infrared protection eyeglass, the logical amplifying circuit of band, data owner treatment circuit, intelligent UV driven and signal sample circuit, controller power source change-over circuit, controller relay output circuit, controller 4-20mA signal output apparatus, ultraviolet extraction and change-over circuit, ultra-violet light-emitting pipe, infraluminescence pipe, ultraviolet photoelectric detection pipe, controller insulating power supply 485 communicating circuits, outer reflector and structure stationary installation; Back installation reflector at ultraviolet protection eyeglass and infrared protection eyeglass; The infraluminescence pipe links to each other with the logical amplifying circuit of band; The ultra-violet light-emitting pipe links to each other with intelligent UV driven and signal sample circuit with the ultraviolet photoelectric detection pipe; Connect a ultraviolet at detector power-switching circuit output terminal and extract and change-over circuit, at the output terminal connection detector data master treatment circuit of intelligent UV driven and signal sample circuit; The logical amplifying circuit of output terminal connecting band at detector external signal input detection and detector self check infrared LED driving circuit and detector data master treatment circuit; Output terminal at detector data master treatment circuit and detector power-switching circuit is connected detector insulating power supply 485 communicating circuits, detector 4-20mA signal output apparatus and detector relay output circuit.
Detector self check flow process of the present invention: pass through timer internal, cumulative time reaches when preestablishing the time, detector detects the Ultraviolet sensor signal and whether has flare up fire, if no flare up fire then starts the ultra-violet light-emitting pipe, whether and it is normal to detect Ultraviolet sensor, normally then enter the detection infrared sensor, the undesired ultraviolet detector fault of promptly reporting; Whether the infrared sensor of detector detection simultaneously signal exists flare up fire, and whether if no flare up fire then starts the infraluminescence pipe, and it is normal to detect infrared sensor, normally then enters fire alarm and judges flow process, the undesired infrared eye fault of promptly reporting.
Shell of the present invention comprises bonnet, protecgulum, housing, front panel, reflector, ultraviolet protection eyeglass, ultraviolet detection plate, infrared acquisition plate and infrared protection eyeglass; infrared acquisition plate, system and ultraviolet detection plate are fixed on the front panel; detector output interface plate is fixed on the back cover portion of housing, and front panel is connected by signal wire with back cover portion.
Intelligent UV driven of the present invention and signal sample circuit are by adopting 8 single-chip microcomputer U12 as UV driven, import double output booster transformer T1 by the list that PIN7 control triode N1 drives, obtain the required high pressure of ultraviolet light fulgurite by fast recovery diode and resistance capacitance coupling, adopt pulsed drive; Carry out communication by PIN4-63 pin and U8 primary processor, the UV driven mode different according to the different signal controlling of primary processor.Ultraviolet photoelectric detection pipe and ultra-violet light-emitting pipe adopt the step-up transformer power supply.
Band of the present invention leads to amplifying circuit, mainly is divided into infrared signal extraction, infrared sensor amplification, gain adjustment, threshold voltage adjustment and signaling conversion circuit.It is that power supply passes through R1 ground connection again by the PIN3 that infrared sensor U1 is connected to U5 that infrared signal is extracted circuit, the PIN1 of U5 and PIN2 short circuit, and adopt dynamic threshold technology; U5B, U6A, U6C constitute the infrared sensor amplifying circuit, and adopt the digital zooming technology; 1 road of U6C and two-way digital regulation resistance U7 constitutes gain adjustment circuit; 0 road of U6B and two-way digital regulation resistance U7 constitutes threshold voltage and adjusts circuit; Form signaling conversion circuit by D3, R6, D4, R38, R14, C45, E6.
Detector relay output circuit of the present invention adopts the output of passive relay signal; Detector 4-20mA signal output apparatus is by the pulse-width signal output of single-chip microcomputer; Undesired signal when detector insulating power supply 485 communicating circuits adopt optocoupler, power isolation module, 485 communication chips and 3 moments to suppress diode inhibition external communication on the signal wire.
The method of ultra-violet and infrared composite flame detecting device of the present invention may further comprise the steps:
The step 1 system initialization
System reset is closed and is interrupted relay, port, RAM and timer T
0, T
1Initialization, gathering reports to the police is provided with and the sensitivity setting, lights red LED 5 seconds, green LED 5 seconds, A/D initialization, second timer T
2Interruption is set and is opened in initialization, clear house dog zone bit, and circular wait is interrupted.
The step 2 signals collecting realizes by coding
By second timer T
2Carry out signal amplitude and the frequency data that A/D is converted to two passages after regularly interrupting.By interrupting judgement, carry out corresponding interrupt operation, enter second timer T
2Regularly sequence of operation is behind the interrupt service subroutine: second timer T
2Regularly interrupt initialization; Fire alarm is judged; Whether need frequency collection; Whether need the amplitude sampled data; Whether needing to carry out fire alarm comprehensively judges; Second timer T then
2Regularly interrupt returning.
The step 3 signal Processing
The data of gathering are carried out algorithm bring computing into, judged whether that by algorithm fire takes place, specific algorithm is:
1, the infra red flame amplitude is judged
(1) based on fixedly base value judgement
Work as A
i-Ca 〉=Cb and (A
i-Ca)/and n 〉=Cb, wherein n is natural number, wherein A
iBe the current infrared AD sample magnitude of passage of flame, Ca is a fixedly base value of passage of flame, and Cb is the infrared response fixed value, is the ratio of the signal amplitude increase of passage; In the judgement number of times of setting, satisfy this condition and judge that then amplitude satisfies the fire alarm condition, skip based on the compensation base value determining program line flicker frequency of going forward side by side and judge; Work as A
iDuring-Ca＜Cb, carry out judging based on the compensation base value;
(2) judge based on the compensation base value
Work as A
i-Ca
1〉=Cb
1And (A
i-Ca
1)/n 〉=Cb
1, Ca wherein
1Be passage of flame compensation base value, Cb is the infrared response offset, satisfies this condition and judge that then amplitude satisfies the fire alarm condition in the judgement number of times of setting, and the line flicker frequency of going forward side by side is judged;
2, the infra red flame frequency is judged
Infra red flame passage frequency data mean value in the judgement number of times of setting is Fav, 4≤Fav≤20, and the infrared sample frequency data of passage of flame are followed successively by Fa
0(current), Fa
1, Fa
2..., Fa
i(i=N), wherein continuous 4 secondary frequencies satisfy 4≤Fa
i≤ 20 (i=N), then the fire alarm condition is satisfied in the flicker frequency judgement.
3, the ultraviolet flame frequency signal is judged
Ultraviolet flame passage frequency data mean value in the judgement number of times of setting is Fuv, Fmin≤Fuv≤Fmax, and ultraviolet flame channel frequence data are followed successively by Fu
0(current), Fu
1, Fu
2... Fu
i(i=N), wherein continuous 4 secondary frequencies satisfy Fmin≤Fai≤Fmax (i=N), and then the fire alarm condition is satisfied in the judgement of ultraviolet flicker frequency.
4, the infrared compound judgement of ultraviolet.
When meeting fire alarm, export infrared fire alarm, when infrared when ultraviolet meets fire alarm, output ultraviolet fire alarm, when two kinds of signals have a kind of when meeting fire alarm, when another kind is in the fire alarm alert status, match according to the reduced parameter that sets in advance, then report a fire if meet alarm condition.
The output of step 4 signal
By detector 4-20mA signal output apparatus or detector relay output circuit alerting signal being exported, is then end of run of alerting signal, is not that alerting signal then enters the detector self check.
The invention effect
1. adopt the ultraviolet light fulgurite of intelligence to drive, adopt 8 single-chip microcomputers to carry out independent pulsed drive, can require to carry out the driving of different configuration modes according to different detection times, having simplified original ultraviolet light fulgurite needs a plurality of chips to coordinate to drive pulsewidth, adopts the working method that exchanges continued power then to greatly reduce power consumption relatively.Designed step-up transformer, realized adopting a transformer that the power supply of ultraviolet photoelectric detection pipe and ultra-violet light-emitting pipe is provided, by cooperating the multiple metering of primary processor, sample circuit in conjunction with multichannel unlike signal grade, can count the signal of different electric pressures, changing in the past, ultraviolet detection just carries out pulse signal number statistics, the not present situation of distinguishing at level of signal.
2. adopt the flame frequency of digital zooming technology and dynamic threshold to extract circuit, detector is with logical the amplification at infrared sensor, and, be adjusted into detector by gain amplifier and carry out existing in the detection process flare up fire detection of closely big fire that solution is provided by adopting digital regulation resistance to carry out the gain amplifier adjustment; Detector has adopted digital regulation resistance to carry out the flame frequency signal in conjunction with amplifier and extracted, and has guaranteed detector under varying environment, and is during background drift, effective all the time to the extraction of flare up fire.
3. adopt ultra-violet light-emitting pipe and infraluminescence pipe; in conjunction with reflector through special processing; constituted the detector optical perfection; guaranteed that detector is when possessing the flame of detection function; the function that has possessed detector internal sensor failure detection has again also realized simultaneously the pollution detection at detector protection eyeglass.
4. adopt the output of passive relay signal, RS485 industrial communication interface, 3 kinds of communication modes of 4-20MA signal output, the basic most on the market controller of compatibility has good compatible performance, adopts the flame-proof type structure, is applicable to various industrial sites.
Description of drawings
Fig. 1 is the ultra-violet and infrared composite flame detecting alarm complete machine structure synoptic diagram that has optical self-checking function;
Fig. 2 is the ultra-violet and infrared composite flame detecting alarm system architecture synoptic diagram that has optical self-checking function;
Fig. 3 is the ultra-violet and infrared composite flame detecting alarm design fundamentals block diagram that has optical self-checking function;
Fig. 4 is the system flowchart that has the ultra-violet and infrared composite flame detecting alarm of optical self-checking function;
Fig. 5 is the infrared acquisition flow chart of data processing figure that has the ultra-violet and infrared composite flame detecting alarm of optical self-checking function;
Fig. 6 is a circuit diagram fixing on the infrared acquisition plate, wherein,
(a) be the logical amplification circuit diagram of detector band;
(b) detect and self check infrared LED driving circuit figure for the input of detector external signal;
(c) be detector dual-colored LED driving circuit figure;
Fig. 7 is a circuit diagram fixing on system and the ultraviolet detection plate, wherein,
(a) be the detector power-switching circuit;
(b) be detector data master treatment circuit;
(c) be intelligent UV driven and signal sample circuit;
(d) be Ultraviolet sensor self check driving circuit;
(e) extract and change-over circuit for UV signal;
Fig. 8 is a circuit diagram fixing on the detector output interface plate, wherein,
(a) be detector electric power polarity change-over circuit and power supply anti-clutter circuit;
(b) be detector 4-20MA signal output apparatus;
(c) be detector insulating power supply circuit;
(d) be controller insulating power supply 485 communicating circuits;
(e) be detector relay output circuit;
1 is bonnet among the figure, and 2 is housing, and 3 is protecgulum, and 4 is front panel, and 5 is the ultraviolet protection eyeglass, and 6 is the ultraviolet detection plate, and 7 is the infrared acquisition plate, and 8 is infrared protection eyeglass, 9 reflectors, 10 shells, 11 supports, 12 detector output interface plates.
Embodiment
As shown in Figure 1; shell comprises bonnet, protecgulum, housing, front panel, ultraviolet protection eyeglass, ultraviolet detection plate, reflector, infrared acquisition plate and infrared protection eyeglass; infrared acquisition plate, system and ultraviolet detection plate are fixed on the front panel; detector output interface plate is fixed on the back cover portion of housing, and front panel is connected by signal wire with back cover portion.Wherein infrared protection eyeglass requires to adopt the transmitance to the infrared light of 1-14 μ m to be higher than 85% material, and that environmental suitability requires is corrosion-resistant, wiping, damp and hot and high low temperature.The ultraviolet protection eyeglass require to adopt the transmitance to the ultraviolet light of 200-1000nm to be higher than 85% material, and that environmental suitability requires is corrosion-resistant, wiping, damp and hot and high low temperature.
As shown in Figures 2 and 3, the detector power-switching circuit obtains different circuit module required voltages by power source conversion, UV signal extract and change-over circuit+the 12v input end links to each other with detector power-switching circuit+12v output terminal, the 3.3v output terminal of UV signal extraction and change-over circuit and intelligent UV driven and signal sample circuit+the 3.3v input end links to each other; The output terminal of intelligence UV driven and signal sample circuit links to each other with the input end of detector data master treatment circuit; The input end of detector dual-colored LED driving circuit links to each other with the 24v output terminal of detector power-switching circuit, and detector dual-colored LED driving circuit output terminal detects with the input of detector external signal respectively and the input end of self check infrared LED driving circuit and Ultraviolet sensor self check driving circuit links to each other; The input of detector external signal detects and the output terminal of self check infrared LED driving circuit links to each other with the input end of the logical amplifying circuit of band; The output terminal of the logical amplifying circuit of band links to each other with the input end of detector data master treatment circuit, and the input end of detector electric power polarity change-over circuit and power supply anti-clutter circuit links to each other with detector power-switching circuit+24v output terminal; The output terminal of detector data master treatment circuit links to each other with controller 4-20mA signal output apparatus, controller 4-20mA signal output apparatus links to each other with detector power-switching circuit+24v output terminal, the input end of detector relay output circuit links to each other with detector power-switching circuit+12v output terminal with the output terminal of detector data master treatment circuit respectively, and physical circuit connects shown in Fig. 6,7,8.
Logical amplifying circuit output infra red flame spoke value signal of band and infrared frequency signal are to detector data master treatment circuit; The input of detector external signal detects and self check infrared LED driving circuit, detect outside self-test signal and output to detector data master treatment circuit, the infrared self check drive signal of receiving system plate drives self check infrared LED driving circuit simultaneously, detector dual-colored LED driving circuit, the dual-colored LED control signal on the receiving system plate drives the dual-colored LED driving circuit.UV driven and signal sample circuit, by separate processor output boostering transformer drive signal, the adjustment signal of pick-up probe data owner treatment circuit and according to the different drive signal of this signal output; UV signal is extracted and change-over circuit, handles driving the ultraviolet light fulgurite by voltage transformation, and outputs to detector data master treatment circuit by signal extraction and conversion acquisition ultraviolet flame signal; Ultraviolet sensor self check driving circuit, the self check control signal of pick-up probe data owner treatment circuit drives the ultra-violet light-emitting pipe; Detector data master treatment circuit is gathered infrared spoke value signal, infrared frequency signal, ultraviolet data and other input signals, and the line data of going forward side by side is handled.Detector electric power polarity change-over circuit and power supply anti-clutter circuit provide non-polar direct supply interface; The pwm signal of controller 4-20mA signal output apparatus pick-up probe data owner treatment circuit output, and convert the 4-20MA output circuit of standard to; Detector relay output circuit, the drive signal that the output of pick-up probe data owner treatment circuit is different, and the corresponding relay signal of output.
Infrared sensor, infraluminescence pipe, the logical amplifying circuit of band, detector external signal input detection and self check infrared LED driving circuit and detector dual-colored LED driving circuit are fixed on the infrared detection plate; UV driven and signal sample circuit, data owner treatment circuit, detector power-switching circuit, UV signal extract circuit and Ultraviolet sensor self check driving circuit all is fixed on system and the ultraviolet detection plate; Detector electric power polarity change-over circuit and power supply anti-clutter circuit, detector insulating power supply 485 communicating circuits, detector 4-20mA signal output apparatus and detector relay output circuit are all on detector signal output interface plate.The infrared acquisition plate is connected by contact pin with the signal transmission of system and ultraviolet detection plate, adopt between plate and be bolted on the front panel, system and ultraviolet detection plate are connected by flexible cord with the signal transmission of signal output interface plate, and detector signal output interface plate is fixed on the back cover portion of detector.Wherein detector is by being fixed on detector signal output interface plate wiring on the bonnet, and receives in the control system by explosion suppression interface.
Ultraviolet sensor self check driving circuit drives self check ultra-violet light-emitting pipe and sends ultraviolet light, by getting to back reflection on the reflector behind the ultraviolet protection eyeglass, enter Ultraviolet sensor by the ultraviolet protection eyeglass once more, by gathering the ultra-violet light-emitting pipe modulating frequency that the contrast of current probe value sets in advance and the initial probe parameter of sensor, judge whether sensor is in normal operating conditions, and can infer whether needs clean or change the ultraviolet protection eyeglass according to the frequency change amplitude of detectable signal; Detector external signal input simultaneously detects and self check infrared LED driving circuit driving self check infrared LED sends infrared light; by getting to back reflection on the reflector behind the infrared protection eyeglass; enter infrared sensor by infrared protection eyeglass once more; by gathering the infrared LED modulating frequency that the contrast of current probe value sets in advance and the initial probe parameter of sensor; judge whether sensor is in normal operating conditions, and can infer whether needs clean or change infrared protection eyeglass according to the amplitude of variation of probe value.
Detector self check flow process: pass through timer internal, cumulative time reaches when preestablishing the time, detector detects the Ultraviolet sensor signal and whether has flare up fire, if no flare up fire then starts the ultra-violet light-emitting pipe, whether and it is normal to detect Ultraviolet sensor, normally then enter the detection infrared sensor, the undesired ultraviolet detector fault of promptly reporting; Whether the infrared sensor of detector detection simultaneously signal exists flare up fire, and whether if no flare up fire then starts the infraluminescence pipe, and it is normal to detect infrared sensor, normally then enters fire alarm and judges flow process, the undesired infrared eye fault of promptly reporting.
1. adopt alarm as shown in Figure 1, detect, carry out infrared detection according to following steps according to flow implementation shown in Figure 4:
Suppose that the infrared response fixed value is Cb, passage of flame fixedly base value is Ca, and passage of flame compensation base value is Ca
1, the current infrared A/D sample magnitude of passage of flame is A
1, the infrared amplitude of passage of flame is with respect to fixing base value added value Δ A
0=A
1-Cb, the infrared amplitude of passage of flame is with respect to compensation base value added value Δ A
1=A
1-Cb, the infrared sample frequency data of passage of flame are followed successively by Fa
0(current), Fa
1, Fa
2, Fa
3(3 times) current 4 the infrared frequency data mean values of passage of flame are Fap, and N is a natural number, and size of data is set according to the signal ratio of sensor.
Work as A
i-Ca＞Cb satisfies this condition 4 times and judges directly that then infrared amplitude satisfies the fire alarm condition continuously.And skip based on the compensation base value determining program line flicker frequency of going forward side by side and judge; Work as A
i-Ca＜Cb then directly carries out judging based on the compensation base value.
Work as A1-Ca
1＞Cb and satisfy this condition 4 times and judge directly that then infrared amplitude satisfies the fire alarm condition continuously.
The step 4 flicker frequency is judged
4≤Fap≤20, and Fa
0(current), Fa
1, Fa
2, Fa
3(3 times) wherein have at least 2 to satisfy 4≤Fa (i)≤20 i=0,1,2,3 judgements are satisfied frequency and are satisfied the fire alarm condition.Otherwise, then do not satisfy the fire alarm condition.
2. as shown in Figure 4, carrying out ultraviolet according to following steps judges:
Suppose that the high value of ultraviolet responsive stationary is X
0, passage of flame fixedly low value is Y
0, the high value of the current ultraviolet frequencies sampling of passage of flame is Z
1, the current ultraviolet frequencies sampling of passage of flame low value is K
1,
Work as Z
1-X
00, satisfy this condition for 4 times and judge directly that then the high value of ultraviolet satisfies the fire alarm condition, carries out next judgement continuously; Work as K
1-Y
00, and satisfy this condition 4 times and judge directly that then the ultraviolet low value satisfies the fire alarm condition continuously, otherwise then do not report to the police.
3. the infrared compound judgement of ultraviolet
When meeting fire alarm, export infrared fire alarm, when infrared when ultraviolet meets fire alarm, output ultraviolet fire alarm, when two kinds of signals have a kind of when meeting fire alarm, when another kind is in the fire alarm alert status, match according to the reduced parameter that sets in advance, then report a fire if meet alarm condition.
4. signal output
By detector 4-20mA signal output apparatus or detector relay output circuit alerting signal being exported, is then end of run of alerting signal, is not that alerting signal then enters the detector self check.
Claims (10)
1. a ultra-violet and infrared composite flame detecting alarm that has optical self-checking function comprises the ultraviolet protection eyeglass, infrared protection eyeglass, the logical amplifying circuit of band, detector data master treatment circuit, intelligence UV driven and signal sample circuit, the detector power-switching circuit, detector relay output circuit, detector 4-20mA signal output apparatus, ultraviolet is extracted and change-over circuit, the ultra-violet light-emitting pipe, the infraluminescence pipe, the ultraviolet photoelectric detection pipe, detector insulating power supply 485 communicating circuits, outer reflector, the input of detector external signal detects and self check infrared LED driving circuit and structure stationary installation; It is characterized in that behind ultraviolet protection eyeglass and infrared protection eyeglass, reflector being installed; The infraluminescence pipe links to each other with the logical amplifying circuit of band; The ultra-violet light-emitting pipe links to each other with intelligent UV driven and signal sample circuit with the ultraviolet photoelectric detection pipe; Connect a ultraviolet at detector power-switching circuit output terminal and extract and change-over circuit, at the output terminal connection detector data master treatment circuit of intelligent UV driven and signal sample circuit; The logical amplifying circuit of output terminal connecting band at detector external signal input detection and self check infrared LED driving circuit and detector data master treatment circuit; Output terminal at detector data master treatment circuit and detector power-switching circuit is connected detector insulating power supply 485 communicating circuits, detector 4-20mA signal output apparatus and detector relay output circuit.
2. a kind of ultra-violet and infrared composite flame detecting alarm that has optical self-checking function according to claim 1 is characterized in that described intelligent UV driven and signal sample circuit, adopts 8 single-chip microcomputers to carry out independent pulsed drive.
3. a kind of ultra-violet and infrared composite flame detecting alarm that has optical self-checking function according to claim 1, it is characterized in that ultra-violet light-emitting pipe and infraluminescence pipe and reflector form complete optics self checking structure, finish the self-checking function of detector by the driving of detector external signal input detection and self check infrared LED driving circuit and Ultraviolet sensor self check driving circuit.
4. a kind of ultra-violet and infrared composite flame detecting alarm that has optical self-checking function according to claim 1 is characterized in that described ultraviolet photoelectric detection pipe and ultra-violet light-emitting pipe adopt the step-up transformer power supply.
5. a kind of ultra-violet and infrared composite flame detecting alarm that has optical self-checking function according to claim 1 is characterized in that the logical amplifying circuit of described band adopts the digital zooming technology; Dynamic threshold technology is partly adopted in infrared extraction in the logical amplifying circuit of described ultraviolet extraction and change-over circuit and band; Detector is with logical the amplification at infrared sensor, and carries out the gain amplifier adjustment by digital regulation resistance.
6. a kind of ultra-violet and infrared composite flame detecting alarm that has optical self-checking function according to claim 1 is characterized in that described detector relay output circuit adopts the output of passive relay signal; Described detector 4-20mA signal output apparatus is by the pulse-width signal output of single-chip microcomputer.
7. a kind of ultra-violet and infrared composite flame detecting alarm that has optical self-checking function according to claim 1 is characterized in that the undesired signal on signal wire when described detector insulating power supply 485 communicating circuits adopt optocoupler, power isolation module, 485 communication chips and 3 moments to suppress diode inhibition external communication.
8. the method that adopts the described ultra-violet and infrared composite flame detecting alarm that has optical self-checking function of claim 1 to survey, it is characterized in that adopting infrared detection and the parallel mixing detection mode of ultraviolet detection, by ultraviolet and infrared compound judgement fire alarm, carry out according to the following steps: the system reset of step 1 system initialization, close and interrupt, relay, port, RAM and timer (T0, T1) initialization, gathering reports to the police is provided with and the sensitivity setting, lighted red LED 5 seconds, green LED 5 seconds, A/D initialization, second timer T2 initialization, set and open interruption, clear house dog zone bit, circular wait is interrupted; The step 2 signals collecting, carrying out A/D after realizing regularly interrupting by second timer T2 by coding is converted to, the signal amplitude and the frequency data of two passages have been obtained, by interrupting judgement, carry out corresponding interrupt operation, enter second timer T2 regularly behind the interrupt service subroutine sequence of operation be: second timer T2 regularly interrupts initialization; Fire alarm is judged; Whether need frequency collection; Whether need the amplitude sampled data; Whether needing to carry out fire alarm comprehensively judges; Second timer T2 regularly interrupts returning then; The data that the step 3 signal Processing is returned to collection are carried out algorithm and are brought computing into, judged whether that by algorithm fire takes place, specific algorithm is 4 parts: (1) infra red flame amplitude is judged, (2) the infra red flame frequency is judged, (3) the ultraviolet flame frequency signal is judged, the infrared compound judgement of (4) ultraviolet; The output of step 4 signal is exported alerting signal by detector 4-20mA signal output apparatus or detector relay output circuit, is then end of run of alerting signal, is not that alerting signal then enters the detector self check.
9. the method that the ultra-violet and infrared composite flame detecting alarm that has optical self-checking function according to claim 8 is surveyed is characterized in that described its specific algorithm of step 3 signal Processing carries out according to the following steps:
(1), the infra red flame amplitude is judged
1. based on fixedly base value judgement
Work as A
i-Ca 〉=Cb and (A
i-Ca)/and n 〉=Cb, wherein n is a natural number, A
iBe the current infrared A/D sample magnitude of passage of flame, be the fixing base value of passage of flame, Cb is the infrared response fixed value, is the ratio that the signal amplitude of passage increases; In the judgement number of times of setting, satisfy this condition and judge that then amplitude satisfies the fire alarm condition, skip based on the compensation base value determining program line flicker frequency of going forward side by side and judge; Work as A
i-Ca＜Cb then carries out judging based on the compensation base value;
2. judge based on the compensation base value
Work as A
i-Ca
1〉=Cb
1And (A
i-Ca
1)/n 〉=Cb
1, in the judgement number of times of setting, satisfy this condition and judge that then amplitude satisfies the fire alarm condition, carry out flicker frequency and judge;
(2), the infra red flame frequency is judged
Infra red flame passage frequency data mean value in the judgement number of times of setting is Fav, 4≤Fav≤20, and the infrared sample frequency data of passage of flame be followed successively by Fa0, Fa1, Fa2 ..., Fa
i(i=N), wherein continuous 4 secondary frequencies satisfy 4≤Fa
i≤ 20 (i=N),, then the fire alarm condition is satisfied in the flicker frequency judgement;
(3), the ultraviolet flame frequency signal is judged
Ultraviolet flame passage frequency data mean value in the judgement number of times of setting is Fuv, Fmin≤Fuv≤Fmax, and ultraviolet flame channel frequence data Fu0, Fu1, Fu2 ... Fu
i(i=N), wherein continuous 4 secondary frequencies satisfy Fmin≤Fa
i≤ Fmax (i=N), then the fire alarm condition is satisfied in the judgement of ultraviolet flicker frequency;
(4), the infrared compound judgement of ultraviolet
When meeting fire alarm, export infrared fire alarm, when infrared when ultraviolet meets fire alarm, output ultraviolet fire alarm, when two kinds of signals have a kind of when meeting fire alarm, when another kind is in the fire alarm alert status, match according to the reduced parameter that sets in advance, then report a fire if meet alarm condition.
10. the method that the ultra-violet and infrared composite flame detecting alarm that has an optical self-checking function according to claim 8 is surveyed is characterized in that described step 4 signal exports its detector self check workflow and be:
Pass through timer internal, cumulative time reaches when preestablishing the time, detector detects the Ultraviolet sensor signal and whether has flare up fire, if no flare up fire then starts the ultra-violet light-emitting pipe, whether and it is normal to detect Ultraviolet sensor, normally then enter the detection infrared sensor, the undesired ultraviolet detector fault of promptly reporting; Whether the infrared sensor of detector detection simultaneously signal exists flare up fire, and whether if no flare up fire then starts the infraluminescence pipe, and it is normal to detect infrared sensor, normally then enters fire alarm and judges flow process, the undesired infrared eye fault of promptly reporting.
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Address after: 110034 No. 218-20, Wen Da Road, Huanggu District, Shenyang, Liaoning. Patentee after: Shenyang Institute of Fire Protection, Ministry of Emergency Management Address before: 110034 No. 218-20, Wen Da Road, Huanggu District, Shenyang, Liaoning. Patentee before: Shenyang Fire-Extiquishing Inst., Public Security Ministry |
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