CN1009575B - Photoelectric smoke sensor - Google Patents
Photoelectric smoke sensorInfo
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- CN1009575B CN1009575B CN 85105779 CN85105779A CN1009575B CN 1009575 B CN1009575 B CN 1009575B CN 85105779 CN85105779 CN 85105779 CN 85105779 A CN85105779 A CN 85105779A CN 1009575 B CN1009575 B CN 1009575B
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- 239000000779 smoke Substances 0.000 title claims abstract description 35
- 238000012937 correction Methods 0.000 claims abstract description 92
- 238000001514 detection method Methods 0.000 claims description 170
- 238000000034 method Methods 0.000 claims description 42
- 230000008569 process Effects 0.000 claims description 32
- 238000009966 trimming Methods 0.000 claims description 17
- 230000001915 proofreading effect Effects 0.000 claims description 12
- 238000013500 data storage Methods 0.000 claims description 4
- 238000013524 data verification Methods 0.000 claims description 2
- 230000005055 memory storage Effects 0.000 claims 2
- 238000012423 maintenance Methods 0.000 claims 1
- 238000003860 storage Methods 0.000 abstract description 6
- 230000002238 attenuated effect Effects 0.000 abstract description 2
- 230000003247 decreasing effect Effects 0.000 abstract 1
- 238000010586 diagram Methods 0.000 description 16
- 238000010186 staining Methods 0.000 description 12
- 239000000428 dust Substances 0.000 description 8
- 230000003287 optical effect Effects 0.000 description 7
- 238000004364 calculation method Methods 0.000 description 5
- 239000003990 capacitor Substances 0.000 description 5
- 230000035945 sensitivity Effects 0.000 description 5
- 230000005284 excitation Effects 0.000 description 4
- 238000007689 inspection Methods 0.000 description 4
- 238000012544 monitoring process Methods 0.000 description 4
- 230000008859 change Effects 0.000 description 3
- 238000006243 chemical reaction Methods 0.000 description 3
- 238000004140 cleaning Methods 0.000 description 3
- 230000006870 function Effects 0.000 description 3
- 230000002159 abnormal effect Effects 0.000 description 2
- 238000000151 deposition Methods 0.000 description 2
- 238000003958 fumigation Methods 0.000 description 2
- 238000011084 recovery Methods 0.000 description 2
- 240000007594 Oryza sativa Species 0.000 description 1
- 235000007164 Oryza sativa Nutrition 0.000 description 1
- 238000003556 assay Methods 0.000 description 1
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- 230000005540 biological transmission Effects 0.000 description 1
- 238000011109 contamination Methods 0.000 description 1
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- 230000014509 gene expression Effects 0.000 description 1
- 238000004020 luminiscence type Methods 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
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- 235000009566 rice Nutrition 0.000 description 1
- 238000012546 transfer Methods 0.000 description 1
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Abstract
In the present invention, a light-emitting element generates light pulses at fixed cycles, and the light pulses attenuated by smoke are received by a light-sensitive detecting element arranged against the light-emitting element, so that a fire situation can be detected. When a power supply is switched on, first light-sensitive detecting data is fixedly stored and held as initial data in a storage by a microcomputer in the light-sensitive detecting element and is not erased when the power supply is cut off temporarily. The light-sensitive detecting data is converted to correction data by making use of a correction ratio so as to make contaminative correction and recognize the fire situation. When a correction period lasts for fifty minutes, the correction ratio is corrected, and that is to say, the correction ratio is increased or decreased by a micro value only in every correction period until the light-sensitive detecting data is overlapped with the initial light-sensitive detecting data.
Description
The present invention relates to a kind of photoelectric smoke sensor, the relative arrangement of light-emitting component wherein and keep a fixed range each other with photosensitive detection device, cause light to weaken owing to smog enters the light-emitting component and the zone between the photosensitive detection device of being settled, weaken the generation that detects the condition of a fire according to this light; More particularly, the present invention relates to a kind of photoelectric smoke sensor, wherein because the change of staining the photosensitive detection signal that is caused of optical system obtains correction.
Up to now, in the photoelectric smoke sensor that light-emitting component and photosensitive detection device are settled toward each other, use for a long time through one, on the window of light-emitting component and photosensitive detection device, deposited dust, this descends the signal level of photosensitive detection, if because dust is when dropping to photosensitive detection signal level to be lower than one to judge the threshold value that the condition of a fire takes place, fire signal that will a mistake of output.Therefore, must carry out cleaning termly to dispose dust.
Yet, because it is pretty troublesome to dispose the cleaning of dust, once considered a kind of device, photosensitive detection signal wherein is automatically to proofread and correct according to the amount of dust that is deposited.For example, the known patent No. is disclosed a kind of photoelectric smoke sensor in 4,317,113 the United States Patent (USP).
In this photoelectric smoke sensor, the gain that is used to amplify the operational amplifier of photosensitive detection signal is according to because the degree of the signal attenuation that the deposition of dust causes and being changed step by step, when photosensitive detection weakens owing to dust deposit, gain amplifier will increase by one with weaken the amount that degree equates, therefore might obtain the photosensitive detection signal of same condition when depositing with free from dust.
Yet, utilize the gain control of operational amplifier to stain the sky, school, have following problem.
First problem is:
As a kind of method that changes gain amplifier, set resistor network is owing to the control of the on/off of a plurality of analog switches changes its impedance in the operational amplifier feedback circuit.Yet analog switch has usually and is approximately 100 to 300 ohm conducting state resistance, because the existence of this conducting state resistance, feedback impedance can not accurately be determined.Therefore be difficult to utilize the mode that switch switches to carry out linear gain control.
Second problem is:
For the switching by switch realizes linear gain control must coming control group by a plurality of variable resistors are set, this just causes the circuit complicated control operation simultaneously that becomes also to become pretty troublesome.
The 3rd problem is:
The control of the on/off of a plurality of analog switches needs a bi-directional counter, therefore exist one make gain control circuit become complicated problem.
On the other hand, proofreading and correct by the mode of gain control in the method for contamination, initial photosensitive detection data and current photosensitive detection data are regularly to compare, and according to the gain of the change of the difference between these two data operational amplifier, eliminate this difference with this.Yet under the situation that smokescope increases gradually, for example in the fumigation condition of a fire, such signal attenuation also is exaggerated gain control and proofreaies and correct, and so just exists the danger that the condition of a fire fails to be detected.
In addition, because being used to stain the initial photosensitive detection data of correction is deposited in when power turn-on, for example, be owing to detect smog after fire signal of receiver output, even when for recovery power supply once being disconnected and then connecting, be used as initial photosensitive detection data in these photosensitive detection data that constantly descend and stored again, exist the danger that the condition of a fire after the recovery can not be detected like this owing to smog.
And then in the initial photosensitive detection data of storing owing to power connection and the threshold value of definite judgement condition of a fire also becomes undesired, the result exists to produce that error is reported to the police or the danger of false alarm.
The object of the present invention is to provide a kind of photoelectric smoke sensor, photosensitive detection data wherein are by the situation input that is not corrected, and the photosensitive detection data of proofreading and correct are to obtain from the computation process of carrying out according to the correction coefficient of this time.
Another object of the present invention is to provide a kind of photoelectric smoke sensor, wherein resulting initial photosensitive detection data are stored when power supply is connected first, and proofreading and correct for staining of carrying out during each is predetermined is according to the difference between initial photosensitive detection data and the current photosensitive detection data correction ratio to be proofreaied and correct, with now photosensitive detection data multiply by this corrections than and obtain the photosensitive detection data of correction.
A further object of the present invention is to provide a kind of photoelectric smoke sensor, wherein when producing difference between initial photosensitive detection data and the current photosensitive detection data, proofreaies and correct than only being corrected an amount that equates with predetermined small numerical value.
A further object of the present invention is to provide a kind of photoelectric smoke sensor, even wherein after power supply is disconnected, the storage of initial photosensitive detection data still can be held one fixing during.
A further object of the present invention is to provide a kind of photoelectric smoke sensor, and the initial photosensitive detection data of wherein storing by checking determining an abnormal data whether within a predetermined scope, thereby prevent to store an abnormal data.
These and other purpose of the present invention, feature and advantage will show from the following description in conjunction with the accompanying drawings.
Fig. 1 is the system arrangement key diagram that shows one embodiment of the invention;
Fig. 2 is a block diagram that shows system arrangement of the present invention;
Fig. 3 is the block diagram that shows an embodiment of receiving element of the present invention;
Fig. 4 is a general flow chart that shows this receiving element programmed control process;
Fig. 5 shows a functional block diagram of staining the treatment circuit of correction according to the present invention; With
Fig. 6 shows because the process flow diagram of staining trimming process of programmed control receiving element.
Fig. 1 shows the embodiment general arrangement key diagram of the present invention as a kind of delustring formula divergence type photoelectric smoke sensor.
Among Fig. 1, receiver of reference number 10 expressions, this receiver is installed in the indoor or similar place of central monitoring.This receiver 10 receives condition of a fire detection signal and produces condition of a fire alarm from photoelectric smoke sensor, demonstrates the zone that the condition of a fire takes place simultaneously.Receiver 10 is gone back the receiving check alerting signal and is reported to the police and indicate so that this photoelectric smoke sensor receiving check is drawn a signal wire 16 from receiver 10 when breaking down in the photoelectric smoke sensor, and it is also as power lead; Check signal wire 18 and a common line 20 for one.Photosensitive detection device 12a in a plurality of photoelectric smoke sensors ... 12n and these signal wires 16,18 are connected with 20.
In photoelectric smoke sensor of the present invention, an independent photoelectric smoke sensor is to be made of the combination of photosensitive detection device 12a and light-emitting component 14a, or constituting by corresponding photosensitive detection device 12n and light-emitting component 14n.
For example, will describe referring to an independent photoelectric smoke sensor that constitutes by photosensitive detection device 12a and light-emitting component 14a.In this example, light-emitting component 14a is relative with photosensitive detection device 12a to be settled and keeps the preset distance of a scope at 5-100 rice, for example is 15 meters.The a pair of signal wire 22 of being drawn by photosensitive detection device 12a is connected with generation optical element 14a with 24.Signal wire 22 with 24 this to be connected with photosensitive detection device 12n be identical with being connected of light-emitting component 14n.In addition, constitute the corresponding photosensitive detection device 12a of photoelectric smoke sensor ... 12n and light-emitting component 14a ... 14n is connected on the surface or similar structures of ceiling by connection seat 15 respectively.
Fig. 2 is a block scheme, shown the arrangement of system among Fig. 1, wherein photosensitive detection device 12a and light-emitting component 14a, and photosensitive detection device 12n and light-emitting component 14n are and settle toward each other and keep a preset distance respectively.Light-emitting component 14a and 14n are equipped with luminescent device 26.Led control signal is to be transferred to luminescent device 26 from photosensitive detection device 12a and 12n by signal wire 22 and 24, and luminous with this excitation luminescence device 26, signal wire 22 and 24 also is used as power lead.Light from luminescent device 26 enters the photosensitive detector spare 28 that photosensitive detection device 12a and 12n are equipped with by Smoke Detection district 30.Therefore, with photosensitive detection device 12a and light-emitting component 14a, or photosensitive detection device 12n and light-emitting component 14n are connected on the surface of ceiling or on the similar structures time, should adjust optical axis so that light enters photosensitive detector spare 28 exactly from luminescent device 26.On the one hand, go forward side by side into photosensitive detector spare 28 by Smoke Detection district 30, owing in Smoke Detection district 30, existing smog that this light is attenuated from the light that generating device 26 sends.Like this, strength retrogression's light of depending on smokescope is transfused to photosensitive detector spare 28.
The control section of an employing microcomputer is housed respectively among each photosensitive detection device 12a and the 12n.After optical axis being adjusted or similarly adjust when installing, the photosensitive detection data that encouraged with primary power and when the power connection deposit in as initial photosensitive detection data among the storer of microcomputer.Determine that the threshold value that the condition of a fire takes place is that computing draws on the basis of the initial photosensitive detection data that store memory is gone into, the photosensitive detection data that no matter when obtain all compare to discern the generation of the condition of a fire with the threshold level.In case determine to have taken place the condition of a fire, a fire signal is transferred to receiver 10 by signal wire 16, and this signal wire is also as power lead.In addition, will clearly state hereinafter, the interior initial photosensitive detection data of storer that are stored in microcomputer are used to stain in the control procedure of correction.When initial photosensitive detection data surpass to be proofreaied and correct boundary, one showed to stain and proofreaies and correct the inspection alerting signal that reaches capacity by checking that signal wire 18 outputs to receiver 10 in staining the control procedure of correction.And then the initial photosensitive detection data that deposit storer when power supply is connected for the first time in are under the unusual situation, check the alerting signal that signal wire 18 is also checked to receiver 10 transmission.
Fig. 3 is a frame diagram, has shown that the present invention adopts the circuit arrangement of the photosensitive detection device that uses in the photoelectric smoke sensor of microcomputer as control section.
Among Fig. 3, constant voltage circuit 32 is accepted power supply and is exported one 16 volts supply voltage from receiver.Capacitor 34 with big capacitance is connected to an output terminal of this constant voltage circuit 32.Even temporarily interrupt because power supply trouble or analogue make from the power supply of receiver, because therefore the voltage that charges in the capacitor 34 power supply in a regular time sections makes it initial photosensitive detection data Di that deposits in the microcomputer storer may be kept its storage still to the microcomputer power supply as control section.The result is that even temporarily interrupt from the power supply of receiver, initial photosensitive detection data Di will not erased.
It is to make the output voltage of constant voltage circuit 32 steady that capacitor 34 also has a function.
Reference number 36 is represented the control module of an employing microcomputer.For example, what adopted is eight microcomputers, and specifically, that adopted is the μ PD80C48C that Nippon Electric Company, Ltd. makes.Power supply to the control module 36 that adopts microcomputer is to be undertaken by a constant voltage circuit 38.Constant voltage circuit 38 will be converted to 5 volts constant voltage voltage from 16 volts output voltage of constant voltage circuit 32 and it will be supplied with control module 36.
When power connection, power supply involution circuit 40 brings into operation and exports an initial slot signal with the microcomputer within the start-up control unit 36.In response to this initial slot signal, control module 36 carries out light emitting control and light and receives control, and makes because the initial photosensitive detection data luminous and that the receipts photocontrol obtains that follow closely behind the power turn-on deposit storer 42 in.When initial photosensitive detection data are deposited in storer 42, carry out a verification of data to determine whether these initial photosensitive detection data are within the predetermined scope.In the time of in it is in this scope, initial photosensitive detection data are deposited in storer 42.Otherwise, in the time of outside it is in this scope, to alerting signal of checking of receiver output.
Finish after the storing process of initial photosensitive detection data by energized and according to the output of power supply involution circuit 40, the microcomputer within the control module 36 will make programmed control stop and turning back to standby shape degree attitude.Control module 36 operation subsequently is according to carrying out from main clock pulse.Master clock circuit 44 every a fixed cycle in 2 to 4 seconds scopes promptly to time clock of control module 36 outputs.According to this time clock, control module 36 is carried out luminous and light receives control, input is in these actual constantly photosensitive detection data that obtain, and obtain because the photosensitive detection data of correction that the calculating process of staining correction obtains, thus according to the relatively identification condition of a fire between photosensitive detection data of correction and the threshold value.
Luminous controling unit 46 receives because control module 36 follows operation after the power connection and the led control signal of exporting according to major clock closely, therefore and luminescent device and to control signal of light-emitting component output, by using capacitor discharge to be equipped with the pulse excitation light-emitting component.Just because of like this, the light that detects smog is launched into photosensitive detection device.Similar with luminous controling unit 46, light receives control module 48 and receives control signal according to the light from control module 36 and move, and control module 36 is to move according to the output that follows power supply involution circuit 40 after the power turn-on closely or according to the time clock of master clock circuit 40.That is, light receives control module 48 and makes 50 operations of a constant voltage circuit, and providing voltage to photosensitive detection circuit 52 thus is 10 volts power supply.Light receives control module 48 also makes reference voltage generator 54 operations to produce a reference voltage of 2.5 volts that is used for mould/number conversion, also is used in supply voltage monitoring circuit 56 operations of the output voltage that monitors constant voltage circuit 32 in addition.
Photosensitive detection circuit 52 comprises photosensitive detector spare 28, amplifying circuit and peak holding circuit wherein.This photosensitive detection circuit 52 receives the emission light of selfluminous element by photosensitive detector spare 28, is converted into an electric signal, and by amplifying circuit this photosensitive detection signal is amplified to a specific level.Simultaneously, photosensitive detection circuit 52 keeps the peak level of photosensitive detection signal and exports this signal by peak holding circuit.Be provided for A/D converter 58 and convert the 4-digit number signal to from the photosensitive detection signal of photosensitive detection circuit 52 outputs, and be used as photosensitive detection data Input Control Element 36.2.5 volts of reference voltages that A/D converter 58 will be converted to from the photosensitive detection signal of photosensitive detection circuit 52 from reference voltage generator 54 are basic digital signal.In addition, determine that from sensitivity the sensitivity of circuit 60 determines that signal also is transfused to A/D converter 58.Sensitivity determines that circuit 60 takes out the voltage of the output voltage of reference voltage generator 54 as the difference division by the conversion of rotary switch or similar structures, determines to judge the different threshold values of the condition of a fire thus in control module 36.Determine that from sensitivity the sensitivity of circuit 60 determines that signal also is converted to digital signal by A/D converter 58 and offers control module 36, and then supply voltage monitoring circuit 56 monitors 16 volts output voltage of constant voltage circuits 32.When supply voltage is reduced to a level, as when being lower than 12 volts, monitoring circuit 56 by A/D converter 58 to control module 36 notice abnormity of power supply.
Fire signal output circuit 62 is received in of having produced when control module 36 has been judged the generation of the condition of a fire and exports and carry out switchover operation and the fire signal electric current is flow through between also as the signal wire 16 of power lead and the common line 20 of drawing from receiver 10, transmits fire signal thus.When photosensitive detection device Be Controlled unit 36 is judged to be when unusual, check that signal output apparatus 64 makes to check that electric current flows through between the common line 20 of checking signal wire 18 and drawing from receiver 10, thus the transfer check signal.The inspection marking current of the fire signal electric current of fire signal output circuit 62 and inspection signal output apparatus 64 can be respectively, for example up to 30 milliamperes.On the other hand, at fire signal or check that these electric currents are compressed to an average standby current that is about 250 microamperes under the situation that signal is not output.
Fig. 4 is a process flow diagram that shows the control procedure of the photosensitive detection device that is undertaken by the microcomputer in the control module among Fig. 3 36.
When power supply was connected for the first time, the microcomputer in power supply involution circuit power supply slot signal of 40 outputs and the control module 36 began computing.Microcomputer is finished luminous and is received photocontrol in program block 66 then.Because luminous and receipts photocontrol is by the photosensitive detection signal of photosensitive detection circuit 52 excitations of photosensitive detection device, so that the photosensitive detection signal Dn input square frame 68 of process mould/number conversion.In next one identification square frame 70, once check to determine whether system is in original state.When in square frame 70, determining, when making system be in original state because power connection is finished by the power supply involution, subsequently be identification square frame 72.In square frame 72, once check with the photosensitive detection data Dn that determines to obtain first whether within a predetermined scope.When first photosensitive detection data Dn is defined in outside this scope, being square frame 74 and checking alerting signal subsequently to one of receiver output.That is, when the photosensitive detection data Dn that follows excitation after the power turn-on closely is outside preset range the time, this just means a kind of situation, for example, because the optical axis deflection between photosensitive detection device and the light-emitting component makes the level of photosensitive detection signal very low.Therefore detection alarm takes place to readjust optical axis.On the other hand, when photosensitive detection signal Dn exceeds preset range, can think that in photosensitive detection circuit 52 gain control of the amplifier that is equipped with or similar structures is improper.Equally in this case, the inspection alarm of readjusting also takes place in a similar manner.
On the other hand, when photosensitive detection data Dn is within the preset range, the square frame 76 and the photosensitive detection data Dn that then enter subsequently will be stored among the storer 42 of microcomputer as initial photosensitive detection data Di.Be about to power supply from the receiver cut-out that is done as mentioned above, because the electric charge in the capacitor 34 that constant voltage circuit 32 is equipped with, the initial photosensitive detection data Di of storage will keep its storage in the storer 42 in a preset time, and it can not erased owing to temporarily disconnected power supply or analogue like this.
After the storage of initial photosensitive detection data Di was finished, handling procedure entered the trimming process that stains in the square frame 78.This stains trimming process will give further detailed explanation referring to the process flow diagram of the block diagram among Fig. 5 and Fig. 6.
Staining in the trimming process of square frame 78, photosensitive detection data Dn is multiplied by a correction than to proofread and correct owing to the optical attenuation that causes of staining on photosensitive detection device and the light-emitting component window, proofreaies and correct photosensitive detection data Dn for one that is in square one when acquisition does not tarnish with window therefrom.
In square frame 80, thus will from square frame 78, be carried out stain the photosensitive detection data of the correction that obtains in trimming process Da and be that threshold value that basic computing obtains is compared and identified the condition of a fire with initial photosensitive detection data Di.In fact, the photosensitive detection data that are used for condition of a fire identification are to derive from a plurality of moving averages that stain correction data.And these to stain correction data be to obtain in each fixing assay intervals according to major clock.Continued a regular time during length when the time interval that this photosensitive detection number is lower than a predetermined threshold value, promptly be judged to be the condition of a fire has taken place.As the result of the condition of a fire identifying of square frame 80, when having judged the generation condition of a fire in the identification square frame 82, follow by square frame 84 and to receiver output fire signal.In contrast, when having judged when the condition of a fire does not take place, do not carry out the fire signal output procedure in the square frame 84 but directly enter square frame 86 and stop control simultaneously microcomputer turning back to stand-by state.Then, system wait is to the input of next time clock.
Fig. 5 is for showing the block diagram of the microcomputer function of control procedure in the execution graph 4.This microcomputer is proofreaied and correct than means for correcting 90 by initial photosensitive detection data storage device 88, counts corrected device 92, and correction computing device 94 and condition of a fire recognition device 96 constitute.
That is, initial photosensitive detection data storage device 88 only deposits photosensitive detection data Dm in as initial photosensitive detection data Di in the moment of the power supply involution that causes owing to power connection.When the photosensitive detection data of storing initial, obviously it is assumed to these photosensitive detection data and is in the predetermined scope.With reference to the trimming process that stains in the process flow diagram of Fig. 6, will further be expressly understood and proofread and correct relatively calibration device 90, the function of counts corrected device 92 and correction computing device 94.In addition, 94 pairs of correction computing devices are according to the luminous of major clock and receive photosensitive detection data Dn that photocontrol draws and carry out and stain correction, computing and output calibration data Da, and it is supplied with condition of a fire recognition device 96.
Fig. 6 shows a process flow diagram of staining trimming process.This process is to be carried out by the photosensitive detection device in the photoelectric smoke sensor of the present invention.This stains trimming process is to be carried out by the programmed control of the microcomputer that constitutes control module, or by proofreading and correct relatively equipment 90 shown in Figure 5 comprising, counts corrected device 92 and correction computing device 94, and the functional block that is used to stain trimming process is carried out.
Now key diagram 6 stains trimming process.At first in square frame 100, the counts corrected device is rised in value.This counts corrected device can be realized by a programmable counter.The counts corrected device is counted a major clock, this major clock be in 2.7 to 3.0 seconds scopes for example fixing during output, counter reaches full counting and produces a counter output in about 50 minutes time stains trimming process with execution.That is, in identification square frame 102, monitor the count value of counts corrected device.When the gate time of counter reached as calibration cycle 50 minutes, the trimming process in square frame 104 and square frame subsequently promptly began.
Below will the principle of carrying out in square frame 104 and the square frame subsequently that stains trimming process be described.
Supposition now is N at this correction ratio constantly when being Dn according to the luminous of the time clock current photosensitive detection data that photocontrol obtains with receipts.Proofreading and correct photosensitive detection data Da will be obtained by following formula:
Da＝Dn×N……（1）
Correction in the equation (1) is defined as than N:
N＝1/（1-K/100）……（2）
Wherein K be a correction coefficient and when original state K=0, along with photosensitive detection data reduce owing to staining, increase continuously at each calibration cycle correction coefficient K, as K=1,2,3 ... in contrast, along with photosensitive detection data increase, has a value that similarly reduces continuously at each calibration cycle correction coefficient K, as K=-1,-2 ,-3 ...That is, under initial photosensitive detection data Di and situation that current photosensitive detection data Dn does not conform to, correction coefficient K only increases or reduces at each calibration cycle ± and 1, proofread and correct therefrom and compare N.
Staining trimming process and will give actual explanation in square frame 104 and the square frame subsequently.At first in square frame 104 with the zero clearing of counts corrected device.Then, by above-mentioned equation (1) from before correction compare N
N-1With the photosensitive detection data Dn now photosensitive detection data of calculation correction Da in square frame 106.
In square frame 106, calculate and proofread and correct after the photosensitive detection data Da, enter identification square frame 108 and check with definite photosensitive detection data Da of correction whether equal initial photosensitive detection data Di.If at this moment window does not tarnish, Da=Di.Yet, if stain, proofread and correct photosensitive detection data Da and become less than data Di, handling procedure enters into identification square frame 110 like this.In square frame 110, the amplitude of proofreading and correct photosensitive detection data Da and initial photosensitive detection data Di is compared.Proofread and correct under the situation of photosensitive detection data Da greater than initial photosensitive detection data Di in the identification relatively of this identification square frame 110, entering square frame 112 and carrying out correction coefficient Kn correction is a less value so that reduce to proofread and correct correction coefficient trimming process than N.That is, when Da＞Di, compare N because in square frame 106, be used for the previous correction of the photosensitive detection data of calculation correction Da
N-1Excessive, thus the photosensitive detection data of the correction Da that calculates is greater than initial photosensitive detection data Di.Therefore, in square frame 112, the correction coefficient Kn of Jiao Zhenging is by following definite equation computing again:
Kn＝K
n-1-1……（3）
In contrast, when Da＜Di had been judged in identification in the square frame 110, entering square frame 114 and new correction coefficient Kn was to be calculated by following corrector:
Kn＝K
n-1+1……（4）
Under the situation of in square frame 114, correction coefficient being proofreaied and correct because in square frame 106, be used for the photosensitive detection data of calculation correction Da before correction compare N
N-1Excessive, Da＜Di stains correction so that lack.Therefore, by above-mentioned formula (4) with correction coefficient K
N-1Only increase+1 and obtain new correction coefficient Kn.This increase of Kn causes that the correction that obtains by above-mentioned formula (2) also is increased than the value of N.
Since the once correction in the square frame 112 and 114, the variable quantity of correction coefficient K be ± 1, and therefore, the variation of proofreading and correct ratio also is compressed to a small value.
In square frame 112 or 114, calculate after the new correction coefficient Kn, enter next square frame 116 and proofread and correct according to above-mentioned formula (1) and (2) with correction coefficient Kn after the photosensitive detection data of calculation correction Da once more.
That is, carry out Kn=K because of Da＜Di
N-1± 1 timing, proofreading and correct than N also increases and calculates further the photosensitive detection data of correction Da near initial photosensitive detection data Di.In contrast, carry out Kn=K because of Da＞Di
N-1-1 timing, correction also reduces than N, calculates the photosensitive detection data of correction of more approaching initial photosensitive detection data Di thus equally.
Subsequently, in identification square frame 118, once check to determine whether the new correction coefficient Kn that proofreaies and correct is within the predetermined boundary in square frame 112 or 114.
As an embodiment, the scope that correction coefficient Kn changes is limited in the following scope.
+50＞Kn＞-20……（5）
Therefore, as the correction result at each calibration cycle correction coefficient Kn, when correction coefficient Kn reached 50 or-20, the value of Kn was just outside the scope of formula (5).Like this, judge that promptly handling procedure enters into square frame 120 and checks alerting signal to one of receiver output, indicates cleaning attached to the dirt on the window of luminous and photosensitive detection device with this by the staining correction and can't carry out of signal Processing.
Shown in the process flow diagram of Fig. 6 this stained correction and will be described in the following actual numerical value of utilizing.
Suppose that now initial photosensitive detection data equal 100, and be 95 and previous correction coefficient K in the photosensitive detection data that current calibration cycle obtains
N-1Be 0.
In square frame 106, calculate correction data Da, because correction coefficient K
N-1Be 0, calculate Da from above-mentioned formula (1) and (2) and equal Dn=95.
Because proofread and correct photosensitive detection data Da less than initial photosensitive detection data Di, so enter square frame 114.In square frame 114, by determining Kn=K
N-1+ 1=0+1=1 and proofread and correct this correction coefficient.
Subsequently, utilize the photosensitive detection data of correction coefficient Kn=1 calculation correction Da as follows after the correction in square frame 116,
Da＝95×〔1/（1-1/100）〕＝95.95
Suppose that the current photosensitive detection data that draw at next calibration cycle are Dn=95 equally, correction coefficient Kn is corrected as 2 at square frame 114, calculates at square frame 116 like this
Da＝95×〔1/（1-2/100）〕＝96.9
Be similar to aforesaid way, all increase, Kn=3 like this, 4,5 at each calibration cycle correction coefficient Kn
Like this, make current photosensitive detection data Dn=95, all increase this in each calibration cycle correction coefficient and make Kn=0,1,2 near initial photosensitive detection data Di, 3,4,5, consequently the correction that is provided by formula (2) makes N=1.00,1.01 than the N increase, 1.02,1.03,1.04,1.05.The result is, even current photosensitive detection data Dn still is 95 constant, proofreaies and correct photosensitive detection data.Da increases makes Da=95.00,95.95,96.94,97.94,98.96,100.00.By this way, proofreading and correct photosensitive detection data overlaps at the 5th calibration cycle with initial photosensitive detection data.As long as keep the relation of Da=Di, can stain correction by using the correction of determining by correction coefficient Kn=5 to finish than N=1.05.
In contrast, when now, photosensitive detection data Dn surpassed initial photosensitive detection data, because square frame 112, reduce to make Kn=0 ,-1 ,-2 ,-3 at each calibration cycle correction coefficient Kn.Proofread and correct like this and reduce to make N=1.00,0.99,0.98,0.97 than N ..., make thus and proofread and correct photosensitive detection data Da near initial photosensitive detection data Di.
In the practical programs process in the computing of trimming process, when tentation data for example comprised eight, carrying out calculating process was by determining
256Da＝256〔Dn×1/（1-Kn/100）〕
In the process flow diagram of Fig. 6, only increase or reduce at each calibration cycle correction coefficient Kn ± 1.Yet if the change of proofreading and correct than N is a small value, the variable quantity of correction coefficient can be ± 2, ± 3 ...The changing value of this correction coefficient can be defined as a value arbitrarily in a scope, as long as it is no more than the changing value of photosensitive detection data in the fumigation condition of a fire in this scope.
In addition, though The present invention be directed to delustring formula divergence type photoelectric smoke sensor is illustrated, also can be applicable to the photoelectric smoke sensor of monolithic devices by the present invention of its actual conditions, wherein, light-emitting component of the present invention and photosensitive detection device are assemblied in the box by whole.
Claims (5)
1, photoelectric smoke sensor, one of them light-emitting component (14) and a photosensitive detection device (12) are installed toward each other and are being left a predetermined distance each other, the pulsed light that sends from above-mentioned light-emitting component weakens owing to smog and is received by above-mentioned photosensitive detection device, detect the condition of a fire thus, this photoelectric smoke sensor is characterised in that it comprises:
A storing apparatus (88), it when power connection with photosensitive detection data D
nStored regularly and be used as the quick detection data of initial light D
i:
Proofread and correct relatively equipment (90) for one, this device is at the photosensitive detection data D of each predetermined pickup calibration cycle with this moment
nWith above-mentioned initial photosensitive detection data D
iCompare, and, when producing difference between above-mentioned two data, proofread and correct a correction than N according to this difference:
A correction computing device (94), the photosensitive detection data D that its input obtains at each predetermined period that is shorter than above-mentioned calibration cycle
n, and obtain proofread and correct photosensitive detection data D as multiplier by multiplication than N with correction in this moment
a: and
A smog recognition device (96), it discerns the condition of a fire on the basis of the photosensitive detection data of above-mentioned correction.
2, according to the photoelectric smoke sensor of claim 1, wherein said correction comparison equipment only has in time of a pickup trimming process by a predetermined small value proofreading and correct than the device of proofreading and correct.
3, according to the photoelectric smoke sensor of claim 1, power supply is cut off after described initial photosensitive detection data are stored even wherein said memory storage has, still can be with the device of this an initial photosensitive detection data storage and a set time sections of maintenance.
4, according to the photoelectric smoke sensor of claim 1, wherein said memory storage has the verification of data device, this is checked device and checks to determine whether described initial photosensitive detection data are within the predetermined scope, should initial photosensitive detection data storage in the time of in it is in this scope, when these initial photosensitive detection data were outside above-mentioned scope, this was checked device and produces an alarm.
5, according to the photoelectric smoke sensor of claim 1, wherein said condition of a fire recognition device has by comparing with a threshold value from a dynamic mean of the photosensitive detection data of a plurality of corrections of above-mentioned correction computing device output discerns the device of the condition of a fire.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 85105779 CN1009575B (en) | 1985-07-30 | 1985-07-30 | Photoelectric smoke sensor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 85105779 CN1009575B (en) | 1985-07-30 | 1985-07-30 | Photoelectric smoke sensor |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN85105779A CN85105779A (en) | 1987-02-04 |
| CN1009575B true CN1009575B (en) | 1990-09-12 |
Family
ID=4794701
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 85105779 Expired CN1009575B (en) | 1985-07-30 | 1985-07-30 | Photoelectric smoke sensor |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1009575B (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1808105B (en) * | 2001-09-11 | 2011-06-08 | 环境系统产品控股公司 | Exhaust opacity measuring device |
Families Citing this family (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP3225977B1 (en) * | 2016-03-31 | 2019-03-13 | ams AG | Method and sensor system for detecting particles |
| EP3392855B1 (en) * | 2017-04-19 | 2021-10-13 | Siemens Schweiz AG | Method and device for configuring a smoke detector |
| JP7033980B2 (en) * | 2018-03-28 | 2022-03-11 | 能美防災株式会社 | Smoke detector and smoke detection system |
| CN109979151B (en) * | 2019-03-28 | 2021-03-16 | 赛特威尔电子股份有限公司 | Smoke alarm method and device, smoke alarm equipment and storage medium |
| CN110895240A (en) * | 2019-05-09 | 2020-03-20 | 北京西门子西伯乐斯电子有限公司 | Calibration auxiliary device, photoelectric smoke detector and calibration method |
| CN110579431A (en) * | 2019-09-17 | 2019-12-17 | 宁波科赛迪电子科技有限公司 | Self-adaptive dimmer and dimming measuring method thereof |
-
1985
- 1985-07-30 CN CN 85105779 patent/CN1009575B/en not_active Expired
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1808105B (en) * | 2001-09-11 | 2011-06-08 | 环境系统产品控股公司 | Exhaust opacity measuring device |
Also Published As
| Publication number | Publication date |
|---|---|
| CN85105779A (en) | 1987-02-04 |
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