CN100394456C - Fire disaster identifying method and fire alarm therefor - Google Patents
Fire disaster identifying method and fire alarm therefor Download PDFInfo
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- CN100394456C CN100394456C CNB2004100311045A CN200410031104A CN100394456C CN 100394456 C CN100394456 C CN 100394456C CN B2004100311045 A CNB2004100311045 A CN B2004100311045A CN 200410031104 A CN200410031104 A CN 200410031104A CN 100394456 C CN100394456 C CN 100394456C
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Abstract
The present invention relates to a fire disaster identifying method and a fire alarm thereof, wherein the method can remarkably improve the sensitivity of a scattered light fire alarm for grains when infrared light and blue light are additionally shot into the volume of measurement and scatterings on the grains in a backward and a forward scattering zones in an infrared and a blue light zones are separately measured and evaluated. The method can be realized by means of the fire alarm which comprises two emission LEDs (2.1a, 2.1b) and two photoelectric receivers (2.2a, 2.2b), wherein the four components are arranged in the way so that the photoelectric receivers can separately receive the forward scattering light and the backward scattering light of longer and shorter wave lengths. The rear part of each photoelectric receiver is connected with a corresponding multipath evaluation circuit.
Description
Technical field
The present invention relates to according to the scattered light principle by in measurement volumes, injecting along the light with first wavelength (Strahlung) of the first emission axis with along the light of having of the second emission axis second wavelength shorter than first wavelength, and by to measure the method for discerning fire/flame at the light that is positioned at scattering on the particle of measurement volumes greater than 90 ° forescatering angle with less than 90 ° back scattering angle.
The invention still further relates to a kind of scattered light fire-alarm that is used to implement this method.
Background technology
By the known a kind of scattered light alarm of WO 01/07161 A1 with two LED (light emitting diode).In order to draw the conclusion about the flue dust kind, the difference of the light wavelength that two LED are sent is selected greatly as far as possible.
From the known a kind of scattered light alarm that is used in particular for being contained in vent passages and the air-conditioning passage of WO 01/59737 A1, it is according to above-mentioned method work, and has one the one LED (light emitting diode) that infrared light and one the 2nd LED are incident to blue light in its measuring chamber.These two alternately pulses of LED.The light that is produced by " infrared " LED makes it to be identified in common bulky grain in the moon (vexed) fire (no fireworks).Might be identified in granule common in the fire with naked light by the scattering of " indigo plant " LED generation is feasible.This can explain that according to this law, for the particle less than wavelength, scattered intensity is along with the biquadratic of wavelength weakens with the Reyleigh law.Though this is correct,, when pressing scattered light principle identification fire, unactual.This known fire-alarm only comprises a photelectric receiver, it can only provide the information of two kinds of relevant scattered light intensities, just, according to the form of implementation difference, the intensity of the forescatering in the infrared or blue wavelength region or the respective strengths of scattered beam backward are provided, or the intensity of the intensity of the forescatering light in infrared wavelength range and the scattered beam backward in blue wavelength region.But, it is also inequality from measurement volumes wherein that arrangement geometric configuration separately can cause scattering separately to this.
From the known a kind of fire alarm method of DE 19902319 A1, wherein, according to the decision that likens out alarm to of the intensity of the intensity of infrared forescatering light and infrared scattered beam backward.Corresponding fire-alarm is selectively with two infrared LEDs and a photelectric receiver or carry out work with an infrared LED and two photelectric receivers conversely.Be preferably 140 ° in order to the angle of measuring forescatering light, and the angle of scattered beam is preferably 70 ° in order to measure backward.The formation of the intensity of forescatering light and the ratio of the intensity of scattered beam backward makes might distinguish type bright and dark cigarette, because bright cigarette provides the signal of strong forescatering and the signal of more weak scattering backward, otherwise, dark cigarette then provides the signal of more weak forescatering and is the signal of strong scattering backward by comparison.Under considering the lower basically situation of the intensity compared with the intensity that produces of the same particle of same concentration in the forescatering district in the fringe area backward, handle absolute strength or signal level and handle the ratio or the merchant of these signal levels simultaneously, also make the certain falsity that might distinguish cigarette (
).For example, the water vapour of high concentration produces the signal of strong forescatering, and this signal then is the alarm of false alarm in the case by triggering than prior art early.But, the merchant who forms from the intensity of the intensity of forescatering and scattering backward draws an eigenwert to water vapour, and this value is irrelevant with concentration basically.By determining this merchant and further considering it in the signal Processing, just can suppress thus otherwise the false alarm that can produce.But, the method that this is known and common shortcoming is arranged according to the alarm of its work and all other structures with the scattered light fire-alarm of infrared ray work is promptly to little and insufficient sensitivity very little particle.This at first is that the feature that makes it to be difficult in time to discern naked light, especially its cigarette is the timber fire of very little particle size.Therefore, under corresponding dangerous situation, must still adopt the ion fire-alarm that little particle is reacted well, this alarm low-activity preparation work.Because this radioactive drug, big and its use of the manufacturing of ionization fire-alarm cost is out of favour, in some countries even generally be forbidden.
Summary of the invention
The objective of the invention is to, a kind of method is provided, it just can improve the scattered light fire-alarm to short grained sensitivity significantly with little additional cost, and obviously improve the applicability of this alarm aspect identification fire heat and very hot thus, and can not be cost with the false alarm frequency that uprises.
State in the method for type in beginning, realize described purpose like this, promptly the light of first and second wavelength is incident to the measurement volumes along the irradiation axis that overlaps (zusammenfallen) from opposite side, measures the scattered beam of first and second wavelength on same main axis at the opposite side of measuring chamber.
Can obtain favourable geometric relationship thus, because with the forescatering light of same first and second wavelength of forescatering angular measurement with measure the scattered beam backward of first and second wavelength with same back scattering angle.This just on the one hand is limited in the cost of photoconductive structure element two LED and two photelectric receivers for example on the photodiode thus, allows on the other hand all four measuring values are carried out same in principle electric treatment.
Can guarantee that by the point symmetry of light distance with respect to the measurement volumes center measured scattered beam intensity is from same measurement volumes, this just helps its comparability.In each measuring period, can obtain the four measuring value in this way, but both individual processing of described measured value, but also combination with one another so that with the reference value of appointment relatively after, can make reliable warning decision.Therefore, preferably deduct the quiescent value level of the factor of corresponding multiply by≤1 from the signal level corresponding with four measured scattered beam intensity, resulting value is weighted, and handle value in (Auswertelogik) through weighting in evaluate logic (circuit), its value with storage is compared, compared result is carried out combination and assessment, according to the result, produces at least one alarm signal (claim 2).According to the intelligence of in alarm, carrying out (processing), can produce for example precaution alarm signal, cigarette identification signal, main alarm signal etc. according to the result.
Particularly, can form weighted value and the weighted value and the ratio between the weighted value of scattered beam intensity backward of the forescatering light intensity of the ratio between the weighted value of scattered beam intensity and second wavelength backward of the forescatering light intensity of first wavelength, and in evaluate logic, handle, compare with the value of storage, compared result is carried out combination and assessment, and produces at least one alarm signal (claim 3) according to the result.
Further can form the ratio of weighted value of the intensity of scattered beam backward of the ratio of weighted value of forescatering light intensity of first and second wavelength and first and second wavelength, and in the evaluate logic circuit, handle determined ratio, compare with the value of storage, compared result is carried out combination and assessment, and produces at least one alarm signal (claim 4) according to the result.
In addition, can carry out ratio to resulting ratio itself again and calculate, and this result and storing value are compared, and when further handling, consider comparative result (claim 5).
Reasonably be, first wavelength and second wavelength will so be selected, so that they do not become ratio of integers (claim 6) each other.Because when first wavelength and second wavelength for example became 1: 2 ratio, the particle of for example strong especially forescatering signal that then produces when first wavelength also produced the strong excessively signal of a level maximum when illuminating with second wavelength.On the other hand, have girth and equal to absorb strongly at the half wavelength place, thereby produce scattered light hardly than the particle of the long wavelength that good especially reflection is arranged.
According to the manufacture level of present LED, in the scope of Infrared, choose first wavelength, in the scope of blue light or ultraviolet light, choose second wavelength (claim 7), then be suitable.
Preferred first wavelength is in the scope of 880nm, and second wavelength is in the scope of 475nm or 370nm (claim 8).
Suitable is that the pulse/time-out of the light of first and second wavelength is than the scope interior (claim 9) that is preferably in 1: 20000, because in order to obtain enough sensitivity, need high light intensity.For this reason, needed electric power not only becomes the load of the power supply/power supply of alarm, but also causes the strong intensification of chip of the generation light of LED, so that after each pulse, needs a sufficiently long cool time, in order to avoid overheated.
In order to implement according to method of the present invention, and realize basic purpose thus, be suitable for adopting a scattered light fire-alarm, it has a measuring chamber that defines a measurement volumes that is communicated with surrounding air, one the emission ultrared LED and one the emission blue light LED from different directions to this measuring chamber internal radiation, and assess with the light of scattering on the photoelectric measurement particle in measurement volumes on the throne and to it therein, wherein, according to the present invention, this alarm comprises two photelectric receivers, they relatively are provided with respect to measurement volumes and a common main axis are arranged, the irradiation axis of two LED and this main shaft wire clamp one intersect less than 90 ° acute angle and on a point that is positioned on the main axis, and this point is positioned at the center (claim 10) of measurement volumes.
LED also can be arranged on the same side of main axis (claim 11).So, a photoelectric receiver measuring is launched the forescatering light of ultrared LED and the scattered beam backward of the LED of emission blue light, otherwise another photelectric receiver is then measured the scattering forward and the scattering backward of launching ultrared LED of the LED of emission blue light.
Another kind of scheme is, LED is symmetrical in main axis and arranges (claim 12), so that two forescatering light of a photoelectric receiver measuring, another photelectric receiver is then measured two scattered beams backward.
But, preferred LED is arranged to the center of point symmetry in measurement volumes, so that its irradiation dead in line (claim 13).Therefore, LED and photelectric receiver all accurately are oppositely arranged in pairs.This has such advantage, and four measured scattered beam intensity are all come out from same measurement volumes separately.In addition, this symmetric arrangement helps the unreflected substantially configuration of measuring chamber, make it to arrange circuit board substantially symmetrically, on this circuit board, arrange LED and photodetector, and cause the rotational symmetric of alarm thereby be the irrelevant sensitivity of air approach axis at least basically.
Preferably, the irradiation axis of LED and main axis press from both sides one separately and are about 60 ° acute angle (claim 14).So, otherwise and measure corresponding forescatering light with 120 ° supplementary angle just with this angular measurement scattered beam backward separately.Show that this is for a favourable compromise proposal of measuring between the diameter of the external diameter that influences alarm fatefully that backward scattering is more favourable 70 ° value and measuring chamber.
In order to protect photodetector not to be subjected to the direct irradiation of LED and not reflexed to the irradiation of the light on the wall of measuring chamber, and for keep measurement volumes pass through the reflection light shine lessly, reasonably be that each LED and each photelectric receiver are placed in its own pipe; In addition, in the outside of measurement volumes, between LED and photelectric receiver, arrange shadow shield (Blende) and light trap (Strahlungsfalle) (claim 15).
Description of drawings
Illustrate below with reference to the accompanying drawings that according to method of the present invention this illustrates three forms of implementation of corresponding scattered light fire-alarm.Among the figure:
Fig. 1 illustrates the vertical view of cutting open on the height of optic axis of substrate of the fire-alarm in first form of implementation, this substrate supporting measuring chamber;
Fig. 2 illustrates the corresponding view of second form of implementation;
Fig. 3 illustrates the corresponding view of the 3rd form of implementation.
Embodiment
Set out from below according to method of the present invention.
According to the type of material of being burnt, form a wide products of combustion spectrum, for simplicity, this products of combustion is called suspended particulates or is also referred to as particle.The fire of heat produces a large amount of minor diameter suspended particulates.For example, comprise 100 CO
2There are a diameter that is about 2.5nm in the suspended particulates structure of molecule or group.The fire that time per unit has a little energy conversion also promptly particularly so-called yin fire (Schwelbrand) then produces the suspended particulates with the diameter that reaches 100 μ m in contrast, also has the drift of part macroscopic view, for example little soot particle.The scattered light fire-alarm that is suitable for discerning all types fire must also can be discerned the suspended particulates of the diameter with 2.5nm to 100 μ m, that is to say, can cover the zone of 5 powers of 10.
Because its high-level efficiency is only used the light source of emission ultrared gallium arsenide (GaAs)-LED as the scattered light fire-alarm so far in practice, this LED produces the wavelength X of a 880nm.The scattered beam intensity first-selection that is produced by a particle depends on the diameter of the particle that is assumed to be ball for simplicity and the ratio of the wavelength of the light that enters.In addition, though that coating of particles and absorption coefficient also play a part is certain,, these parameters are obviously not influence in this article.For a particle diameter less than 0.1 λ, so-called Rayleigh scattering and λ
4Reduce with being directly proportional.Draw thus,, the sensitivity of a rapid reduction is arranged with the fire-alarm of the ultrared LED work of emission for the particle diameter of diameter less than about 90nm.Also have in addition, the Rayleigh scattering is not omnidirectional but tangible maximal value arranged when 0 ° and 180 °, and tangible minimum value is arranged when 90 ° and 270 °.Particle for diameter with 0.1 λ to 3 λ, just be that about 90nm is to about 2.5 μ m under the situation of the ultrared LED of emission, then in contrast, be that the Mie scattering plays a decisive role, direction is depended in this Mie scattering ratio Rayleigh scattering more strongly, and the interaction by light of injecting and the light that reflects on particle demonstrates that disappear mutually and long mutually interference effect.(particle diameter) during greater than 3 λ, scattered beam intensity basically with Wavelength-independent, but at first depend on the type and the shape of particle.
Draw thus, the scattered light fire-alarm to the fire of heat for example the muting sensitivity of timber naked light depend on the wavelength of the Infrared big with respect to the diameter of the particle that will detect.This can not be by the signal that provides by photelectric receiver be provided the intensity of the light that can not inject by raising of amplification solve, this be because, in both cases, for big and particle macroscopic view, dust for example, from the steam of industrial process and the flue dust of cigarette, the sensitivity of alarm all can be too high.
As known in principle from above-mentioned WO 01/59737, though can be by alternately shining measurement volumes with Infrared and blue light, and by the signal that separate processes is directly proportional with the scattered beam of being accepted improve greatly alarm to the Rayleigh scattering of small diameter particles-particularly to its particle that plays a decisive role-sensitivity.Can be with calculating proof, sensitivity can by 10 or bigger factor improve.But,, that is to say that for fear of false alarm or duplicity alarm, only improving alarm is not enough for the sensitivity of the particle of minor diameter in order to obtain reliable alarm decision.The hypothesis of making in WO 01/59737 promptly for big and for little particle, can provide the scattered beam with similar same intensity with blue light irradiation measurement volumes, but this be do not meet especially true.The test of this respect shows on the contrary, no matter be at irradiated region forward, still-so that low level-at irradiated region backward, little particle provides the very similarly scattered beam of intensity in infrared region and under blue light.As what further shown, have only by adding scattered beam intensity just can obtain reliable standard to the dependence of angle, this standard makes might substantially irrespectively distinguish deception amount and fire product (Brandfolgeprodukt) with the type of comburant.
Therefore,, in each measuring period, to measure four scattering strengths, also just say, the forescatering light in the infrared region and the intensity of scattered beam backward, and the same value in blue region according to the present invention.From with signal level that measured intensity is directly proportional deduct the corresponding quiescent value level that preferably has a safe discount (Sicherheitsabschlag) (correspondingly use＜1 factor take advantage of the quiescent value level), measure dynamic process (Messdynamik) and simplify further processing to strengthen.Especially threshold ratio is with the value of storage in an evaluate logic for the end value that will so obtain then.Merchant by forming end value and the information of making comparisons and obtaining adding with the reference value of storing once more.The environment adjustment separately that this operation result itself can for example be worked according to alarm again therein is in conjunction with also assessment.Like this, just for example be used for a series of convictive intermediate result of different precaution alarms, and finally also obtained alarm signal.
Shown in Figure 1 one is suitable for realizing the preferred form of implementation of the alarm of the method.On substrate 1.7, define spherical measurement volumes shown in a usefulness one fine rule circle, that have center 1.5.Ultrared LED 1.1a is along this measurement volumes internal radiation of one first irradiation axis alignment in one emission.With its over against, have one the emission blue light LED 1.1b, it is along one second irradiation axis alignment measurement volumes internal radiation.The first and second irradiation deads in line.The common therewith irradiation axis of one main axis becomes the angle of a α=120 ° to extend through the center 1.5 of measurement volumes equally.On this main axis, relatively arrange first photodiode 1.2a and the 1.2b.Thus, place the acute angle of irradiation axis wire clamp one β=60 ° of main axis and " infrared " LED 1.1a of the reception axis separately of two photodiodes thereon.Correspondingly, the identical acute angle of (second) irradiation axis wire clamp one of main axis and " indigo plant " LED 1.1b.Therefore, photodiode 1.2a by the infrared forescatering light that produces on the particle of " infrared " LED 1.1a in measurement volumes, and measures the blue scattered beam that is produced by " indigo plant " LED 1.1b with one 60 ° back scattering angle with one 120 ° angular measurement.Otherwise photodiode 1.2b measures the blue forescatering light that is produced by " indigo plant " LED1.1b with 120 ° angle α, and measures the infrared scattered beam backward that is produced by " infrared " LED 1.1a with 60 ° back scattering angle.For fear of noisy reflection, LED and photodiode all are arranged in the pipe as 1.6.For the same reason, between LED and photodiode, arrange shadow shield 1.3a, 1.3b and the 1.4a and the 1.4b of suitable moulding.
Other sensor is set, for example temperature sensor 1.8 and gas sensor 1.9 on substrate 1.7.
As usually, a circuit board is arranged, below substrate 1.7 to be used to produce the current impulse that is used for LED 1.1a and 1.1b and to be used to handle the electric signal that provides by photodiode 1.2a and 1.2b.Also as common, substrate 1.7 is contained in (not shown) in the alarm case, the exchange between the air in this chest permission surrounding air and the measuring chamber, but prevent that again ambient light from entering measuring chamber.
Fig. 2 illustrates second form of implementation of alarm, and it has the parts identical with Fig. 1, but adopts different geometric arrangement.For this point is described, the first digit of each reference number is used " 2 " replacement " 1 " herein.
Different with Fig. 1, have only the irradiation dead in line of the LED 2.1b of ultrared LED 2.1a of the emission of walking and emission blue light by measuring center 2.5.Irradiation axis wire clamp one α 1=120 ° the angle of the reception axis of photodiode 2.2a and the ultrared LED 2.1a of emission then presss from both sides a β 2=60 ° angle with the irradiation axis of LED 2.1b of emission blue light.Otherwise irradiation axis wire clamp one β 1=60 ° the angle of the reception axis of photodiode 2.2b and the ultrared LED 2.1a of emission then presss from both sides a α 2=120 ° angle with the irradiation axis of LED 2.1b of emission blue light.Corresponding therewith, the first photodiode 2.2a measures the forescatering light of " infrared " LED 2.1a and the scattered beam backward of " indigo plant " LED 2.1b.In contrast, the second photodiode 2.2b measures forescatering light that is produced by " indigo plant " LED 2.1b and the scattered beam backward that is produced by " infrared " LED 2.1a.
Photodiode 2.2a and 2.2b can exchange its position with LED 2.1a and 2.1b, so that two photodiodes can be accurately staggered relatively with respect to measuring center 2.5.
Four parts just the geometric arrangement of two LED and two photodiodes than unfavorable according to having slightly of Fig. 1 because four measuring to scattered beam have only 75% to be each send since same measurement volumes.This can illustrate with the phase cross surface between each light shafts, described light shafts illustrate with being greatly simplified, that is to say that the sensitivity of omitting the light intensity that sends and photodiode is to dependence of angle and the diffraction effect that produces on inevitable edge.As in an embodiment, comprise other sensor as 2.8 and 2.9 alarm in, measuring center 2.5 is also placed very prejudicially with respect to the mid point of substrate 2.7.This has such consequence, i.e. it is omnidirectional that the sensitivity of alarm does not resemble first form of implementation, but enters alarm with the fire product and enter the direction of its measurement volumes relevant.
Fig. 3 illustrates the 3rd form of implementation of alarm, and it has the parts identical with Fig. 2, but adopts different geometric arrangement.For this point is described, the first digit of each reference number is used " 3 " replacement " 2 " herein.
Different with Fig. 1, have only the reception dead in line of reception axis and the 3.2b of the photodiode 3.2a that walks by measuring center 3.5.This receiving axes line forms main axis." infrared " LED3.1a and main shaft wire clamp one β 1=60 ° acute angle and a α 1=120 ° obtuse angle." indigo plant " LED 3.1b and " infrared " LED 3.1a relatively are provided with respect to main axis, should " indigo plant " LED correspondingly with main shaft wire clamp one β 2=60 ° acute angle and a α 2=120 ° obtuse angle.Thus, photodiode 3.2a had both received infrared forescatering light, received blue forescatering light again, and photodiode 3.2b had then both received infrared scattered beam backward, received blueness scattered beam backward again.
Different with the situation of Fig. 2, in this form of implementation, two LED and two photodiodes cannot be arranged on transposition ground, because in the case, two photodiodes are measured the forescatering light of a LED simultaneously and are then measured the scattered beam backward of another LED, that is to say, the four measuring value is provided, but wherein, always there are two to be roughly the same in couples at least.
As the situation at Fig. 2, in the form of implementation according to Fig. 3, the scattered beam that four measuring comes out also has only 75%, and to be each send since same measurement volumes.The situation that it is better than Fig. 2 is, when alarm comprises other sensor as 3.8 and 3.9 the time, the mid point near substrate 3.7 is provided with measurement volumes, so that the sensitivity of alarm depends on the direction that the fire product enters alarm not too consumingly.Compare with Fig. 2, equally than it advantageously, when adopting the geometric configuration of Fig. 3, the layout of all shadow shield 3.3a, 3.3b and 3.4a, 3.4b is all near measurement volumes and substantially symmetrically around it.But, under the identical situation of others, compared to Figure 1, the location of " indigo plant " LED 3.1b must cause substrate 3.7 that bigger diameter is arranged.
Though be applicable to all forms of implementation, promptly by 120 ° or by 60 ° angular measurement scattered beam.But for the method for implementing by the present invention's suggestion, observing these angles is not essential condition.Important only is, want selected angle like this, so that can in the forescatering direction and in scattering direction backward, measure sufficiently high intensity on the one hand, on the other hand, for to the greatest extent can different fire product how, can the forescatering district of relevant particle with measure enough different intensity in the fringe area backward.
Claims (14)
1. be used for according to the scattered light principle by in measurement volumes, injecting pulsedly along the light with first wavelength of the first emission axis with along the light of having of the second emission axis second wavelength shorter than first wavelength, and by to measure the method for discerning fire at the light that is positioned at scattering on the particle of measurement volumes dividually greater than 90 ° forescatering angle with less than 90 ° back scattering angle, it is characterized by, the light of first and second wavelength is incident to the measurement volumes along the irradiation axis that overlaps from opposite side, opposite side at measuring chamber is measured the scattered beam of first and second wavelength on same main axis, and dividually it is assessed.
2. method as claimed in claim 1 is characterized by: the quiescent value level that deducts the factor of corresponding multiply by≤1 from the signal level corresponding with four measured scattered beam intensity; Resulting value is weighted; And processing is compared with the value of storing through the value of weighting in evaluate logic, and compared result is carried out combination and assessed; And, produce at least one alarm signal according to the result.
3. method as claimed in claim 2 is characterized by: the weighted value and the weighted value and the ratio between the weighted value of scattered beam intensity backward of the forescatering light intensity of the ratio between the weighted value of scattered beam intensity and second wavelength backward that form the forescatering light intensity of first wavelength; And in evaluate logic, handle resulting ratio, and comparing with the value of storing, compared result is carried out combination and assessment; And produce at least one alarm signal according to the result.
4. method as claimed in claim 2 is characterized by: the ratio of weighted value that forms the intensity of scattered beam backward of the ratio of weighted value of forescatering light intensity of first and second wavelength and first and second wavelength; And in evaluate logic, handle resulting ratio, and comparing with the value of storing, compared result is carried out combination and assessment; And produce at least one alarm signal according to the result.
5. as the method for claim 3 or 4, it is characterized by: resulting ratio itself is carried out scale operation; The value of operation result and storage is compared; And when further handling, consider the result of the value comparison of described operation result and storage.
6. method as claimed in claim 1 is characterized by, and first wavelength and second wavelength are chosen to make them not become the ratio of integer each other.
7. as the method for claim 1 or 6, it is characterized by, in the scope of Infrared, choose first wavelength, in the scope of blue light or ultraviolet light, choose second wavelength.
8. a scattered light fire-alarm, the measuring chamber that has the qualification that is communicated with surrounding air one measurement volumes, one the emission ultrared LED and one the emission blue light LED from different directions to this measuring chamber internal radiation, and assess with the light of scattering on the photoelectric measurement particle in measurement volumes on the throne and to it therein, it is characterized by: alarm comprises two photelectric receivers, and they relatively are placed on the common main axis with respect to measurement volumes; The irradiation axis of two LED and this main shaft wire clamp one intersect less than 90 ° acute angle and on a point that is positioned on the main axis, and this point is positioned at the center of measurement volumes.
9. alarm as claimed in claim 8 is characterized by, and LED is arranged on the same side of main axis.
10. alarm as claimed in claim 8 is characterized by, and LED is symmetrical in main axis and arranges.
11. alarm as claimed in claim 8 is characterized by, LED is arranged to the center of point symmetry in measurement volumes, so that its irradiation dead in line.
12. alarm as claimed in claim 8 is characterized by, the irradiation axis of LED is about 60 ° acute angle respectively with main shaft wire clamp one.
13. alarm as claimed in claim 8 is characterized by, and each LED and each photelectric receiver are placed in its own pipe; In addition, in measuring chamber,, between LED and photelectric receiver, arrange shadow shield and light trap in the outside of measurement volumes.
14. alarm as claimed in claim 8, it is characterized by, first photelectric receiver receives the forescatering light of launching ultrared LED and the scattered beam backward of launching the LED of blue light, and second photelectric receiver then receives the scattered beam backward of the ultrared LED of emission and launches the forescatering light of the LED of blue light.
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| CN112634575B (en) * | 2020-12-14 | 2023-02-14 | 深圳市豪恩安全科技有限公司 | Self-adaptive smoke detection method, device and system for detecting particle concentration |
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| WO2000007161A1 (en) * | 1998-07-31 | 2000-02-10 | Gsbs Development Corporation | Smoke detectors |
| JP2001331878A (en) * | 2000-05-22 | 2001-11-30 | Nittan Co Ltd | Smoke sensor and monitoring and control system |
| WO2001095279A1 (en) * | 1999-03-05 | 2001-12-13 | Brk Brands, Inc. | Ultra-short wavelength photoelectric smoke detector |
| CN1418358A (en) * | 2000-02-10 | 2003-05-14 | 马丁·T·科尔 | Improvements relating to smoke detectors particularly ducted smoke detectors |
| CN1111829C (en) * | 1997-09-23 | 2003-06-18 | 罗伯特·博施有限公司 | Smoke detector |
| CN1140884C (en) * | 1999-11-17 | 2004-03-03 | 瓦格纳警报及安全系统有限公司 | Detector for scattered light |
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Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1111829C (en) * | 1997-09-23 | 2003-06-18 | 罗伯特·博施有限公司 | Smoke detector |
| WO2000007161A1 (en) * | 1998-07-31 | 2000-02-10 | Gsbs Development Corporation | Smoke detectors |
| WO2001095279A1 (en) * | 1999-03-05 | 2001-12-13 | Brk Brands, Inc. | Ultra-short wavelength photoelectric smoke detector |
| CN1140884C (en) * | 1999-11-17 | 2004-03-03 | 瓦格纳警报及安全系统有限公司 | Detector for scattered light |
| CN1418358A (en) * | 2000-02-10 | 2003-05-14 | 马丁·T·科尔 | Improvements relating to smoke detectors particularly ducted smoke detectors |
| JP2001331878A (en) * | 2000-05-22 | 2001-11-30 | Nittan Co Ltd | Smoke sensor and monitoring and control system |
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|---|---|
| CN1680982A (en) | 2005-10-12 |
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