CN1719481A - Bi wave band infra red flame detector and its detecting method - Google Patents
Bi wave band infra red flame detector and its detecting method Download PDFInfo
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- CN1719481A CN1719481A CN 200510046913 CN200510046913A CN1719481A CN 1719481 A CN1719481 A CN 1719481A CN 200510046913 CN200510046913 CN 200510046913 CN 200510046913 A CN200510046913 A CN 200510046913A CN 1719481 A CN1719481 A CN 1719481A
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Abstract
The present invention relates to a double-waveband infrared flame detector and its detection method. Said detector includes supporting frame, external shell, protective lens, filter, infrared sensor, amplification circuit, signal processing circuit, power supply conversion circuit, signal output circuit, internal and external shielding covers,detector interface plate and setting circuit. Said invention also provides its working principle and concrete steps of its detection method.
Description
Technical field
The invention belongs to the fire detection technology field, particularly a kind of bi wave band infra red flame detector and detection method thereof.
Background technology
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.
Because the singularity of above-mentioned underground and volumed space building, common typical case feels cigarette, the temperature-sensing fire detecting warning system can't be gathered the cigarette temperature change information that fire sends rapidly, thereby is 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.Bi wave band infra red flame detector is to realize flame detecting under the condition that compares with background scene light; thereby can further reduce the influence of background interference such as sunlight, artificial light light, hot body radiation; be specially adapted to the detection of underground and volumed space building, become last word underground and volumed space building fire-fighting protection.
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.And ultraviolet/infrared flame detector, be a kind of combined type detector, it suppresses to have outstanding performance on the wrong report ability in fire alarm, and two sensors that are it with the double-waveband detector difference are all as fire sensor, must detect fire simultaneously, this has just reduced the fire detection probability.In recent years, somebody's research and utilization CCD imaging combustion technology was surveyed flame both at home and abroad, because the fundamental research of corresponding incipient fire image detection 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.
Concerning fire alarm system, few detector that uses certain type separately.In underground and volumed space building; the two waveband flame detector is one of the most suitable detector that adopts; but, also need to be used the detector (as heat detector, linear infrared beam smoke detector and combustible gas probe etc.) or the alarm button of other type according to the variation of protection place and object.In addition, flame detector needs to link with the alarm controller of different manufacturers on engineering as a special kinds probably.Based on above-mentioned consideration, two waveband flame detector provided by the present invention is designed to the output of passive contact.
Similar with the method for designing of other type fire detector, the design of bi wave band infra red flame detector also is the balance to two complementary factors.These two factors are exactly that the character (flame characteristic: the spectral power distribution of flame, flame flicking frequency range) that is detected signal reaches and be detected the distinguishing ambient noise signal feature of signal (sunlight direct projection, the reflection of passing through reflecting surface or the radiation of other high strength man-made radiation light source).By research to flame characteristic and ambient noise signal feature, determine the detection wave band and the reference background wave band of detector, study the Changing Pattern of two band signal, improving the resolution recognition capability that detector disturbs bias light, thereby correspondingly reduce rate of false alarm and avoid failing to report.
Further developing of microprocessor technology also makes the intellectuality of detector become possibility at present.In recent years both at home and abroad the newest research results of fire detecting and alarm technology also fully shows, it is to improve one of effective method of fire detector performance at present that modern fire sensing technology is combined with computer utility.Therefore, the present invention intends selecting a kind of microprocessor that satisfies system requirements in the design of two waveband flame detector, utilizes its data acquisition and data processing function to realize the differentiation of detector to fire.On the one hand, can make detector possess the intelligence that fire is judged, and then improve the warning reliability and the ratio of performance to price of detector; On the other hand, can reduce hardware interface and software algorithm requirement, be convenient to improve the compatibility of detector different system to fire alarm control unit.Like this, system can directly carry out relevant computing and analysis with background signal to flare up fire in detector inside, and sends operation result to fire alarm control unit as the status information of detector, constitutes the dispersed intelligence system.
By rationally choosing two wave bands of detector, and in conjunction with flame flicking frequency authentication technique and two waveband signal processing software algorithm, the two waveband flame detector can be implemented in higher flame detecting sensitivity when bias light exists, and wrong report also can not occur when the bias light interference is modulated to the flame flicking frequency.
Summary of the invention
At present environmental development situation, the invention provides a kind of bi wave band infra red flame detector, this detector is better than the flame detector of other type owing to comprehensively adopted the two information sensing technology of flame and background, two waveband optimisation technique and fire to judge recognition methods on detection performance.Compare with the flame detector that adopted the single band technology in the past, native system has overcome the drawback that its high sensitivity and low rate of false alarm are difficult to take into account preferably, particularly shows very big advantage on the antijamming capability to high strength artificial light light source and high temperature hot body.
Apparatus of the present invention comprise support; shell; the protection eyeglass; optical filter; infrared sensor; amplifying circuit; signal processing circuit; power-switching circuit; signal output apparatus; in; external shield; the prober interface plate; circuit is set; above-mentioned components and parts all are fixed on the system works plate; wherein protect eyeglass to be used for protection against the tide; dustproof; waterproof and touch-proof; signal processing circuit is used to carry out the A/D conversion; signals collecting and data processing; be packaged with the optical filter of different model respectively in the front of infrared sensor; make infrared sensor gather the wavelength of flame light and bias light different-waveband respectively; the initial setting of circuit realization to signal processing circuit is set; pyroscan converts the infrared light of the different frequency gathered to and sends into signal processing circuit after electric signal amplifies by amplifying circuit; carry out the A/D conversion; signals collecting and data processing; signal after the processing is delivered to the prober interface plate by signal output apparatus with judged result and is shown to the user; wherein be encapsulated in together in the little radome with amplifying circuit again after the encapsulation of sensor and optical filter; more than all devices all be fixed on the system works plate encapsulation then in the enclosure; the position windowing of close sensor on the shell, and be provided with protective glass, the bottom of shell is provided with support.
Above-mentioned amplifying circuit comprises that conversion, frequency-selecting amplification, integration and the frequency signal of signal extract circuit.
Signaling conversion circuit adopts the infrared sensor source class to follow the voltage bias mode, and wherein R22, R23 are divider resistance, determine the working point of sensor S1, and electrolytic condenser CD21 is used for filtering, reduces power supply and disturbs; T3 is a field effect transistor, constitutes boostrap circuit with sensor S1, is used to enlarge the working range of sensor; R25 is output load; Signaling conversion circuit is converted to electric signal with light signal, 3 pin of U5A in the electric signal selecting frequency amplifying circuit of output.
The selective frequency amplifier circuit of signal, the frequency-selecting scope is 4-20Hz, is that flame characteristic flicker frequency and flame are influenced by ambient windstream and the frequency range of glimmering, this frequency-selecting comprises three grades of amplifications, is respectively the first order: R14, C3, R26, CD22; The second level: R10, C9, R9, CD5; The third level: R18, C10, R32, RP3, CD13.3 pin that the prime of circuit (first order) is amplified input U5A adopt directly input, second and third level is amplified the employing capacitive coupling, and the negative pole of CD4 connects 12 pin of U5D, and 14 pin of U5D connect the positive pole of CD7, the negative pole of CD7 connects 3 pin of U6A, the 1 pin output flare up fire ADD1 of U6A.Because detectable signal belongs to small-signal, so prime adopts directly input, second and third grade adopts capacitive coupling can remove flip-flop, wherein the second level exchanges the direct current biasing point that amplifies and is set to VDD* (R31/ (R31+R29)), the direct current biasing point that the third level is amplified can be regulated by regulator potentiometer Rp1, and range of adjustment is 0.1V-1.2V.
Integration and frequency signal extract circuit, and wherein integrating circuit adopts diode D6 and resistance R 13, R12, capacitor C D8 to constitute, and obtain the level of needs by discharging and recharging of electric capacity, input to the A/D converter in the signal processing circuit; Frequency signal extracts the frequency that comparator circuit that circuit constitutes by R35, Rpa1 and U7A obtains signal, inputs to single-chip microcomputer in the signal processing circuit for collection.
It is same as described above that the conversion of another detection channels signal, frequency-selecting amplification, integration and frequency signal extract circuit, so not superfluous telling.
Power output circuit, two-way transition in the input end parallel connection of power supply suppresses diode D1, parallel-series two little magnetic bead LC1, LC2, be DC level by rectifier bridge and diode, electric capacity with bus alternating-current pulse rectification integration then, through two groups of mu balanced circuit step-downs, supply with amplifying circuit and signal processing circuit respectively and use.
Signal output apparatus provides a fire alarm LED, and the passive contact signal output of two relays is provided.
Signal processing circuit, signal processing circuit is mainly single chip circuit, and single chip circuit mainly is the normal operation of keeping single-chip microcomputer, and the protection single-chip microcomputer is not damaged.Clamp diode sD1 and sD2 near Vcc, prevent A/D input voltage clamper A/D conversion input is too high and cause the damage of single-chip microcomputer.
The detection method specific implementation process of using the foregoing invention device comprises: system initialization, signals collecting and conversion, signal Processing, signal output.
Power on, system carries out initialization at every turn, realizes functions such as initial setting, and the information of setting comprises the distribution of system sensitivity, judgment model, raw data, judgement number of times and various storeies.Wherein detector sensitivity is the national standard rank, comprises I level, II level, III level; Judgment model comprises fixed base binarization mode, compensation base value pattern, flicker frequency pattern, and wherein the fixed base binarization mode is an alternative mode; Raw data comprises that flicker frequency is passage of flame frequency collection scope and background channel frequence acquisition range, and passage of flame is the fixing base value Cb of base value Ca and background passage fixedly, passage of flame compensation base value Ca1 and background channel compensation base value Cb1; Judge number of times, refer to gather continuous several groups of signals and judge.
The signal of gathering comprises passage of flame signal and background channel signal, through obtaining the current sample magnitude A of passage of flame in the same time period after the A/D conversion
iWith the current sample magnitude B of background passage
i, passage of flame frequency Fa
iWith background channel frequence Fb
i
(1) based on fixing base value determining program
Work as A
i-Ca 〉=B
i-Cb and (A
i-Ca)/n 〉=B
i-Cb, wherein n is a natural number, is the ratio of the signal amplitude increase of two passages; 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＜B
i-Cb or (A
i-Ca)/n.＜B
i-Cb then carries out based on compensation base value determining program.
(2) based on compensation base value determining program
Work as A
i-Ca1 〉=B
i-Cb1 and (A
i-Ca1)/n 〉=B
i-Cb1 satisfies this condition and judges that then amplitude satisfies the fire alarm condition in the judgement number of times of setting, carry out flicker frequency and judge.
(3) flicker frequency is judged
Passage of flame frequency data mean value in the judgement number of times of setting is Fap,
Background passage frequency data mean value in the judgement number of times of setting is Fbp,
4≤Fap≤20, and Fa0 (current), Fa1, Fa2 ..., Fa
i(i=N), its medium frequency satisfies 4≤Fa
i≤ 20 (i=N), and satisfy Fb
i＞20 or Fb
i＜4 (i=N), then the fire alarm condition is satisfied in the flicker frequency judgement.
Signal output with external other warning devices of form of passive contact output, finally realizes fire alarm by driving different combination of actions output fire, fault, the normal signal of two relays.
Native system general technical level and combination property have reached the late nineteen nineties international most advanced level, but the selling price of external product high (more than 1000 dollars), and detector cost of the present invention is much lower.Development and application of the present invention, to be badly in need of effective fire detecting and alarm new technology, new product for complicated places such as China's large space and hypogee provide, to reducing the loss of this type of building fire, to safeguarding people's lives and properties, significant role is played in defendance economic construction.Its operation and applying not only can be satisfied the active demand to the fire-fighting protection of domestic large space and hypogee, and also alternative imported product for country saves a large amount of foreign exchanges, and will produce the significant social economic benefit.
Compare with external like product, the native system characteristics are as follows:
(1) bi wave band infra red flame detector organically combines flame and the two information sensing technology of background radiation, two waveband design optimizing and microprocessor technology in the native system, realized detector to the accurate detection of flame and to effective inhibition of background interference, solved the flame detector design and gone up contradiction between high sensitivity and low rate of false alarm.
(2) the present invention utilizes double-channel signal microprocessor data disposal route, has improved the adaptability of detector to environment for use, has reached higher degree of intelligence on the fire determination methods.
(3) the present invention is by narrow band pass filter two waveband optimal design and other correlation technique; make the detection sensitivity of bi wave band infra red flame detector reach the I level; detective field of view angle reaches 90 °; realized detection guard space remote, wide visual field, further improved flame detector and be applied to underground and protection effect volumed space building.
(4) whether real the present invention is provided with microprocessor in detector, utilizes its data acquisition with data processing function flare up fire and background interference signal directly to be carried out relevant computing and analysis in detector, judge scene breaking out of fire.Owing to reduced a series of links such as coding, transmission and decoding of a large amount of two waveband information between detector and the controller, the global reliability of system is improved on the one hand, interface improves the engineering adaptability of product with the different classes of alarm controller of compatibility to make detector have flexibly on the other hand.
Description of drawings
Fig. 1 is the schematic block circuit diagram of detector of the present invention;
Fig. 2 is the structured flowchart of detector of the present invention;
Fig. 3 is the signaling conversion circuit schematic diagram;
Fig. 4 is the selective frequency amplifier circuit schematic diagram of signal;
Fig. 5 is that integration and frequency signal extract circuit theory diagrams;
Fig. 6 is the power output circuit schematic diagram;
Fig. 7 is the signal output apparatus schematic diagram, and 7a is a fire alarm led circuit schematic diagram, the passive contact of 7b signal output apparatus schematic diagram;
Fig. 8 is the signal processing circuit schematic diagram;
Fig. 9 is for being provided with circuit theory diagrams;
Figure 10 is the process flow diagram of the inventive method fire alarm intelligent decision;
Wherein, 1 protection eyeglass, 2 little bell housings, 3 system works plates, 4 big radomes, 5 shells.
Embodiment
As shown in Figure 1, 2, apparatus of the present invention comprise support, shell, protection eyeglass, optical filter; infrared sensor, amplifying circuit, signal processing circuit, power-switching circuit; signal output apparatus, inside and outside radome, the prober interface plate, above-mentioned components and parts all are fixed on the system works plate.
Wherein, the wavelength band of last two the channel selecting infrared lights of the selection of optical filter can not be overlapping, and passage of flame optical filter and background channel filter filter range should be chosen in 1.4～15.8um.
Amplifying circuit comprises that conversion, frequency-selecting amplification, integration and the frequency signal of signal extract circuit.
Signaling conversion circuit adopts the infrared sensor source class to follow the voltage bias mode as shown in Figure 3, and wherein R22, R23 are divider resistance, determine the working point of sensor S1, and electrochemical capacitor CD21 device is used for filtering, reduces power supply and disturbs; T3 is a field effect transistor, constitutes boostrap circuit with sensor S1, is used to enlarge the working range of sensor; R25 is output load; Signaling conversion circuit is converted to electric signal with light signal, 3 pin of U5A in the electric signal selecting frequency amplifying circuit of output.
The selective frequency amplifier circuit of signal as shown in Figure 4, the frequency-selecting scope is 4-20Hz, is that flame characteristic flicker frequency and flame are influenced by ambient windstream and the frequency range of glimmering, this frequency-selecting comprises three grades of amplifications, is respectively the first order: R14, C3, R26, CD22; The second level: R10, C9, R9, CD5; The third level: R18, C10, R32, RP3, CD13.3 pin that the prime of circuit (first order) is amplified input U5A adopt directly input, second and third level is amplified the employing capacitive coupling, and the negative pole of CD4 connects 12 pin of U5D, and 14 pin of U5D connect the positive pole of CD7, the negative pole of CD7 connects 3 pin of U6A, the 1 pin output flare up fire ADD1 of U6A.Because detectable signal belongs to small-signal, so prime adopts directly input, second and third grade adopts capacitive coupling can remove flip-flop, wherein the second level exchanges the direct current biasing point that amplifies and is set to VDD* (R31/ (R31+R29)), the direct current biasing point that the third level is amplified can be regulated by regulator potentiometer Rp1, and range of adjustment is 0.1V-1.2V.
Integration and frequency signal extract circuit as shown in Figure 5, and wherein integrating circuit adopts diode D6 and resistance R 13, R12, capacitor C D8 to constitute, and obtain the level of needs by discharging and recharging of electric capacity, input to the A/D converter in the signal processing circuit; Frequency signal extracts the frequency that comparator circuit that circuit constitutes by R35, Rpa1 and U7A obtains signal, inputs to single-chip microcomputer in the signal processing circuit for collection.
It is same as described above that the conversion of another detection channels signal, frequency-selecting amplification, integration and frequency signal extract circuit, so not superfluous telling.
Power output circuit as shown in Figure 6, two-way transition in the input end parallel connection of power supply suppresses diode D1, parallel-series two little magnetic bead LC1, LC2, be DC level by rectifier bridge and diode, electric capacity with bus alternating-current pulse rectification integration then, through two groups of mu balanced circuit step-downs, supply with amplifying circuit and signal processing circuit respectively and use.
Signal output apparatus provides a fire alarm LED as shown in Figure 7, and the passive contact signal output of two relays is provided.
Signal processing circuit as shown in Figure 8, signal processing circuit is mainly single chip circuit, single chip circuit mainly is the normal operation of keeping single-chip microcomputer, and the protection single-chip microcomputer be not damaged.Clamp diode sD1 and sD2 near Vcc, prevent A/D input voltage clamper A/D conversion input is too high and cause the damage of single-chip microcomputer.
The circuit elements device that this circuit adopts adopts following model or parameter:
Integrated circuit: T3=T4=3DJ2H, U1=U4=78L05, U2=PIC16F73, U5=U6=TLC27L4, U7=TLC27L2.
Sensor: S1=PYD1220B, S2=PYD1220C.
Relay: K1=K2=HRS1H-S-24.
Crystal oscillator: XT1=1MC.
Punching inductance: LC1=LC2=CZ1227, DR1=DR2=DZ1003.
Triode: Q1=Q2=Q3=9013.
Diode: D2=D3=D4=D5=D6=SD1=SD2=1N4148, DB1=DB2=DB3=DB4=1N4007, D1=P6KE36CA, Db5=P6KE36BA.
Luminotron: LED1=ф 5LED.
Terminal: J3=two pins; JP1=four pins.
Two cushion pin: JP2=JP3=JP4=JP5=JD1=JD2, two cushion pins.
Three cushion pin: J2=J1=TJ1, three cushion pins.
Resistance: R1=110 Ω, R7=100 Ω, R2=R3=R4=R11=R12=R17=R20=R22=R35=R37=R23=R36=100K, R13=R19=1K, R24=R33=R34=5.1k, R29=R31=R41=R44=R8=R27=200K, RD13=R5=R30=R43=10k, R26=R39=R15=R9=33K, R10=R14=R16=R40=R46=R18=680K, R38=R25=R21=470K, R32=R45=20k, R1=R6=8.2k.
Adjustable resistance: RP1=RP2=RP3=RP4=50k, RPa1=100k.
Electric capacity: C1=c2=30p, C3=C4=C5=C6=C7=C8=C9=C10=104p, CD17=CD18=CD19=CD20=10U/35V, CD1=CD3=CD5=CD25=CD6=CD15=CD8=CD4=CD10=CD7=CD12=CD21=CD2 3=CD11=CD13=CD14=CD22=CD24=Ca1=10U/16V, CD16=47U/35V.
Below by embodiment the process of the inventive method to the fire alarm intelligent decision is described in detail:
Determine to judge that number of times is 4 times, the passage of flame frequency range is 4≤Fa
i≤ 20, i=0,1,2,3, background channel frequence scope Fb
i＞20 or Fb
i＜4, i=0,1,2,3,
Passage of flame fixedly base value is Ca, and background passage fixedly base value is Cb,
Passage of flame compensation base value is Ca1, and background passage fixedly base value is Cb1,
Current 4 the AD sample magnitude of passage of flame are A
1, A
2, A
3, A
4,
Current 4 the AD sample magnitude of background passage are B
1, B
2, B
3, B
4,
The passage of flame amplitude is with respect to fixing base value added value Δ A0
i=A
i-Ca,
Background passage amplitude is with respect to fixing base value added value Δ B0
i=B
i-Cb,
The passage of flame amplitude is with respect to compensation base value added value Δ A1
i=A
i-Ca1,
Background passage amplitude is with respect to compensation base value added value Δ B1
i=B
i-Cb1,
Passage of flame sample frequency data are followed successively by Fa0 (current), Fa1, and Fa2, Fa3 (3 times),
Background channel sample frequency data are followed successively by Fb0 (current), Fb1, and Fb, Fb3 (3 times),
The current 4 secondary frequencies data mean values of passage of flame are Fap,
The current 4 secondary frequencies data mean values of background passage are Fbp;
Example 1, select the fixed base binarization mode, Ca=Cb=15 wherein, n=2,
| A 1 | A 2 | A 3 | A 4 | ΔA0 1 | ΔA0 2 | ΔA0 3 | ΔA0 4 | ΔA1 1/2 | ΔA1 2/2 | ΔA1 3/2 | ΔA1 4/2 |
| 85 | 86 | 87 | 90 | 70 | 71 | 72 | 75 | 35 | 35.5 | 36 | 37.5 |
| B 1 | B 2 | B 3 | B 4 | ΔB0 1 | ΔB0 2 | ΔB0 3 | ΔB0 4 | ΔB0 1 | ΔB0 2 | ΔB0 3 | ΔB0 4 |
| 25 | 26 | 27 | 30 | 10 | 11 | 12 | 15 | 10 | 11 | 12 | 15 |
According to above-mentioned data as can be seen, satisfy A continuous 4 times
i-Ca 〉=B
i-Cb and (A
i-Ca)/2 〉=B
i-Cb, then amplitude satisfies the fire alarm condition, proceeds flicker frequency and judges:
| Sequence number | Fa0 | Fa1 | Fa2 | Fa3 | Fb0 | | Fb2 | Fb3 | |
| 1 | 5 | 7 | 8 | 4 | 0 | 2 | 1 | 0 | |
| 2 | 5 | 7 | 8 | 4 | 1 | 2 | 3 | 0 |
| 3 | 4 | 5 | 7 | 4 | 0 | 2 | 1 | 0 |
| 4 | 4 | 5 | 6 | 4 | 0 | 0 | 0 | 0 |
4≤Fap≤20, and Fa0 (current), Fa1, Fa2 ..., Fa
i(i=N), wherein continuous 4 secondary frequencies satisfy 4≤Fa
i≤ 20 (i=N), and satisfy Fb
i＞20 or Fb
i＜4 (i=N), then the fire alarm condition is satisfied in the flicker frequency judgement
Example 2, select the fixed base binarization mode, Ca=Cb=15 wherein, n=2,
| A 1 | A 2 | A 3 | A 4 | ΔA0 1 | ΔA0 2 | ΔA0 3 | ΔA0 4 | ΔA1 1/2 | ΔA1 2/2 | ΔA1 3/2 | ΔA1 4/2 |
| 85 | 86 | 87 | 90 | 70 | 71 | 72 | 75 | 35 | 35.5 | 36 | 37.5 |
| B 1 | B 2 | B 3 | B 4 | ΔB0 1 | ΔB0 2 | ΔB0 3 | ΔB0 4 | ΔB0 1 | ΔB0 2 | ΔB0 3 | ΔB0 4 |
| 95 | 96 | 97 | 100 | 80 | 81 | 82 | 85 | 80 | 81 | 82 | 85 |
According to above-mentioned data as can be seen, A
i-Ca＜B
i-Cb, (A simultaneously
i-Ca)/2＜B
i-Cb, amplitude does not satisfy the fire alarm condition, then carries out based on compensation base value determining program;
Compensation base value pattern, Ca1=15 wherein, Cb1=85, n=2
| A 1 | A 2 | A 3 | A 4 | ΔA1 1 | ΔA1 2 | ΔA1 3 | ΔA1 4 | ΔA1 1/2 | ΔA1 2/2 | ΔA1 3/2 | ΔA1 4/2 |
| 85 | 86 | 87 | 90 | 70 | 71 | 72 | 75 | 35 | 35.5 | 36 | 37.5 |
| B 1 | B 2 | B 3 | B 4 | ΔB1 1 | ΔB1 2 | ΔB1 3 | ΔB1 4 | ΔB1 1 | ΔB1 2 | ΔB1 3 | ΔB1 4 |
| 95 | 96 | 97 | 100 | 10 | 11 | 12 | 15 | 10 | 11 | 12 | 15 |
According to above-mentioned data as can be seen, A
i-Ca1 〉=B
i-Cb1 and (A
i-Ca1)/2 〉=B
i-Cb1 satisfies this condition 4 times and judges that then amplitude satisfies the fire alarm condition continuously, and the line flicker frequency of going forward side by side is judged;
| Sequence number | Fa0 | Fa1 | Fa2 | Fa3 | Fb0 | | Fb2 | Fb3 | |
| 1 | 5 | 7 | 8 | 4 | 0 | 2 | 1 | 0 | |
| 2 | 5 | 7 | 8 | 4 | 1 | 2 | 3 | 0 | |
| 3 | 4 | 5 | 7 | 4 | 0 | 2 | 1 | 0 | |
| 4 | 4 | 5 | 6 | 4 | 0 | 0 | 0 | 0 |
4≤Fap≤20, and Fa0 (current), Fa1, Fa2 ..., Fa
i(i=N), wherein continuous 4 secondary frequencies satisfy 4≤Fa
i≤ 20 (i=N), and satisfy Fb
i＞20 or Fb
i＜4 (i=N), then the fire alarm condition is satisfied in the flicker frequency judgement.
Example 3, select the fixed base binarization mode, Ca=Cb=15 wherein, n=2,
| A 1 | A 2 | A 3 | A 4 | ΔA0 1 | ΔA0 2 | ΔA0 3 | ΔA0 4 | ΔA1 1/2 | ΔA1 2/2 | ΔA1 3/2 | ΔA1 4/2 |
| 85 | 86 | 87 | 90 | 70 | 71 | 72 | 75 | 35 | 35.5 | 36 | 37.5 |
| B 1 | B 2 | B 3 | B 4 | ΔB0 1 | ΔB0 2 | ΔB0 3 | ΔB0 4 | ΔB0 1 | ΔB0 2 | ΔB0 3 | ΔB0 4 |
| 45 | 46 | 47 | 50 | 30 | 31 | 32 | 35 | 30 | 31 | 32 | 35 |
According to above-mentioned data as can be seen, (A
i-Ca)/2＜B
i-Cb then carries out based on compensation base value determining program;
Compensation base value pattern, Ca1=15 wherein, Cb1=35, n=2,
| A 1 | A 2 | A 3 | A 4 | ΔA1 1 | ΔA1 2 | ΔA1 3 | ΔA1 4 | ΔA1 1/2 | ΔA1 2/2 | ΔA1 3/2 | ΔA1 4/2 |
| 85 | 86 | 87 | 90 | 70 | 71 | 72 | 75 | 35 | 35.5 | 36 | 37.5 |
| B 1 | B 2 | B 3 | B 4 | ΔB1 1 | ΔB1 2 | ΔB1 3 | ΔB1 4 | ΔB1 1 | ΔB1 2 | ΔB1 3 | ΔB1 4 |
| 45 | 46 | 47 | 50 | 10 | 11 | 12 | 15 | 10 | 11 | 12 | 15 |
According to above-mentioned data as can be seen, A
i-Ca1 〉=B
i-Cb1 and (A
i-Ca1)/2 〉=B
i-Cb1 satisfies this condition 4 times and judges that then amplitude satisfies the fire alarm condition continuously, carries out flicker frequency and judges;
| Sequence number | Fa0 | Fa1 | Fa2 | Fa3 | Fb0 | | Fb2 | Fb3 | |
| 1 | 5 | 7 | 8 | 4 | 0 | 2 | 1 | 0 | |
| 2 | 5 | 7 | 8 | 4 | 1 | 2 | 3 | 0 | |
| 3 | 4 | 5 | 7 | 4 | 0 | 2 | 1 | 0 | |
| 4 | 4 | 5 | 6 | 4 | 0 | 0 | 0 | 0 |
4≤Fap≤20, and Fa0 (current), Fa1, Fa2 ..., Fa
i(i=N), wherein continuous 4 secondary frequencies satisfy 4≤Fa
i≤ 20 (i=N), and satisfy Fb
i＞20 or Fb
i＜4 (i=N), then the fire alarm condition is satisfied in the flicker frequency judgement.
Example 4, do not select the fixed base binarization mode, directly compensate fixedly base value and judge, Ca1=15 wherein, Cb=35, n=2,
| A 1 | A 2 | A 3 | A 4 | ΔA1 1 | ΔA1 2 | ΔA1 3 | ΔA1 4 | ΔA1 1/2 | ΔA1 2/2 | ΔA1 3/2 | ΔA1 4/2 |
| 85 | 86 | 87 | 90 | 70 | 71 | 72 | 75 | 35 | 35.5 | 36 | 37.5 |
| B 1 | B 2 | B 3 | B 4 | ΔB1 1 | ΔB1 2 | ΔB1 3 | ΔB1 4 | ΔB1 1 | ΔB1 2 | ΔB1 3 | ΔB1 4 |
| 95 | 96 | 97 | 100 | 60 | 61 | 62 | 65 | 60 | 61 | 62 | 65 |
According to above-mentioned data as can be seen, A
i-Ca1 〉=B
i-Cb1, but (A
i-Ca1)/2＜B
i-Cb1 judges that then amplitude does not satisfy the fire alarm condition, prepares judgement next time.
Example 5, do not select the fixed base binarization mode, directly compensate fixedly base value and judge, Ca1=65 wherein, Cb1=20, n=2,
| A 1 | A 2 | A 3 | A 4 | ΔA1 1 | ΔA1 2 | ΔA1 3 | ΔA1 4 | ΔA1 1/2 | ΔA1 2/2 | ΔA1 3/2 | ΔA1 4/2 |
| 85 | 86 | 87 | 90 | 20 | 21 | 22 | 25 | 10 | 10.5 | 11 | 12.25 |
| B 1 | B 2 | B 3 | B 4 | ΔB1 1 | ΔB1 2 | ΔB1 3 | ΔB1 4 | ΔB1 1 | ΔB1 2 | ΔB1 3 | ΔB1 4 |
| 45 | 46 | 47 | 50 | 25 | 26 | 27 | 30 | 25 | 26 | 27 | 30 |
According to above-mentioned data as can be seen, A
i-Ca1＜B
i-Cb1 judges that then amplitude does not satisfy the fire alarm condition, prepares judgement next time.
Claims (10)
1; a kind of bi wave band infra red flame detector; comprise support; shell; the protection eyeglass; optical filter; infrared sensor; amplifying circuit; signal processing circuit; power-switching circuit; signal output apparatus; in; external shield; the prober interface plate; circuit is set; it is characterized in that; described protection eyeglass is used for protection against the tide; dustproof; waterproof and touch-proof; signal processing circuit is used to carry out the A/D conversion; signals collecting and data processing; be packaged with the optical filter of different model respectively in the front of infrared sensor; make infrared sensor gather the wavelength of flame light and bias light different-waveband respectively; the initial setting of circuit realization to signal processing circuit is set; pyroscan converts the infrared light of the different frequency gathered to and sends into signal processing circuit after electric signal amplifies by amplifying circuit; in signal processing circuit, carry out the A/D conversion; signals collecting and data processing; the signal of exporting after handling is delivered to the prober interface plate by signal output apparatus with judged result and is connected other warning devices; wherein be encapsulated in together in the little radome with amplifying circuit again after the encapsulation of sensor and optical filter, more than all devices all be fixed on the system works plate encapsulation then in the enclosure, on the shell near the position windowing of sensor; and being provided with protective glass, the bottom of shell is provided with support.
2, a kind of bi wave band infra red flame detector as claimed in claim 1 is characterized in that described amplifying circuit comprises that conversion, frequency-selecting amplification, integration and the frequency signal of signal extract circuit.
3, a kind of bi wave band infra red flame detector as claimed in claim 2, it is characterized in that described signaling conversion circuit, adopt the infrared sensor source class to follow the voltage bias mode, wherein R22, R23 are divider resistance, determine the working point of sensor S1, electrolytic condenser CD21 is used for filtering, reduces power supply and disturbs; T3 is a field effect transistor, constitutes boostrap circuit with sensor S1, is used to enlarge the working range of sensor; R25 is output load; Signaling conversion circuit is converted to electric signal with light signal, 3 pin of U5A in the electric signal selecting frequency amplifying circuit of output.
4, a kind of bi wave band infra red flame detector as claimed in claim 2, the selective frequency amplifier circuit that it is characterized in that described signal, the frequency-selecting scope is 4-20Hz, be that flame characteristic flicker frequency and flame are influenced by ambient windstream and the frequency range of glimmering, this frequency-selecting comprises three grades of amplifications, is respectively the first order: R14, C3, R26, CD22; The second level: R10, C9, R9, CD5; The third level: R18, C10, R32, RP3, CD13; 3 pin that the prime of circuit (first order) is amplified input U5A adopt directly input, second and third level is amplified the employing capacitive coupling, and the negative pole of CD4 connects 12 pin of U5D, and 14 pin of U5D connect the positive pole of CD7, the negative pole of CD7 connects 3 pin of U6A, the 1 pin output flare up fire ADD1 of U6A; Because detectable signal belongs to small-signal, so prime adopts directly input, second and third grade adopts capacitive coupling can remove flip-flop, wherein the second level exchanges the direct current biasing point that amplifies and is set to VDD* (R31/ (R31+R29)), the direct current biasing point that the third level is amplified can be regulated by regulator potentiometer Rp1, and range of adjustment is 0.1V-1.2V.
5, a kind of bi wave band infra red flame detector as claimed in claim 1, it is characterized in that described power output circuit, two-way transition in the input end parallel connection of power supply suppresses diode D1, parallel-series two little magnetic bead LC1, LC2, be DC level by rectifier bridge and diode, electric capacity with bus alternating-current pulse rectification integration then, through two groups of mu balanced circuit step-downs, supply with amplifying circuit and signal processing circuit respectively and use.
6, adopt the detection method of the described bi wave band infra red flame detector of claim 1, it is characterized in that this method may further comprise the steps:
Step 1, system initialization: power on, system carries out initialization at every turn, realizes functions such as initial setting, and the information of setting comprises the distribution of system sensitivity, judgment model, raw data, judgement number of times and various storeies;
Step 2, signals collecting and conversion: the signal of collection comprises passage of flame signal and background channel signal, through obtaining the current sample magnitude A of passage of flame in the same time period after the A/D conversion
iWith the current sample magnitude B of background passage
i, passage of flame frequency Fa
iWith background channel frequence Fb
i
Step 3, signal Processing, promptly to the process of the intelligent decision of fire alarm: to the signal gathered based on fixing base value, compensate base value and three kinds of patterns of flicker frequency are judged;
Step 4, signal output: signal output with external other warning devices of form of passive contact output, finally realizes fire alarm by driving different combination of actions output fire, fault, the normal signal of two relays.
7, a kind of bi wave band infra red flame detection method as claimed in claim 6 is characterized in that judgment model described in the step () comprises fixed base binarization mode, compensation base value pattern, flicker frequency pattern, and wherein the fixed base binarization mode is an alternative mode.
8, a kind of bi wave band infra red flame detection method as claimed in claim 6, it is characterized in that raw data described in the step () comprises that flicker frequency is passage of flame frequency collection scope and background channel frequence acquisition range, passage of flame is the fixing base value Cb of base value Ca and background passage fixedly, passage of flame compensation base value Ca1 and background channel compensation base value Cb1.
9, a kind of bi wave band infra red flame detection method as claimed in claim 6 is characterized in that judging number of times described in the step (), refers to gather continuous several groups of signals and judges.
10, a kind of bi wave band infra red flame detection method as claimed in claim 6 is characterized in that the concrete deterministic process of described step (three) is as follows:
(1) based on fixing base value determining program
Work as A
i-Ca 〉=B
i-Cb and (A
i-Ca)/n 〉=B
i-Cb, wherein n is a natural number, is the ratio of the signal amplitude increase of two passages; 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＜B
i-Cb or (A
i-Ca)/n＜B
i-Cb then carries out based on compensation base value determining program;
(2) based on compensation base value determining program
Work as A
i-Ca1 〉=B
i-Cb1 and (A
i-Ca1)/n 〉=B
i-Cb1 satisfies this condition and judges that then amplitude satisfies the fire alarm condition in the judgement number of times of setting, carry out flicker frequency and judge;
(3) flicker frequency is judged
Passage of flame frequency data mean value in the judgement number of times of setting is Fap,
Background passage frequency data mean value in the judgement number of times of setting is Fbp,
4≤Fap≤20, and Fa0 (current), Fa1, Fa2 ..., Fa
i(i=N), wherein continuous 4 secondary frequencies satisfy 4≤Fa
i≤ 20 (i=N), and satisfy Fb
i＞20 or Fb
i＜4 (i=N), then the fire alarm condition is satisfied in the flicker frequency judgement.
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|---|---|---|---|
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| CN 200510046913 CN100590671C (en) | 2005-07-22 | 2005-07-22 | Bi wave band infra red flame detector and its detecting method |
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