A method and device for identifying and measuring smoke particles
A particle and smoke technology, applied in the field of fire early warning, can solve problems such as large signal loss, sensitivity loss, and filter blockage, and achieve the effects of reducing fire alarm delays, broadening the scope of application, and improving reliability
Active Publication Date: 2019-05-10
乐志明
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Problems solved by technology
[0004] One technical solution is to use a filter screen to filter out non-smog particles with a diameter of more than 1 micron. Due to the blockage of the filter screen, on the one hand, the concentration of smoke is reduced, and there are problems of delayed and missed fire alarms. On the other hand, regular monitoring is required. Replacing the filter screen also brings problems such as maintenance and installation inconvenience
[0005] Another technical solution uses the principle of light scattering to identify smoke particles, such as the inventions of US Patent Nos. US08269639 and US07724367, which disclose a detection device and method for smoke particles. Air flow, to obtain two different measurement signals, by calculating the difference between the two signals (subtracting signal 2 from signal 1), the concentration of smoke particles is calculated, and the interference of non-smoke particles (dust) is excluded at the same time, which is currently the best way to remove dust interference The most effective way, but this way also has a problem, the signal difference is compared with signal 1, the sensitivity is lost, especially around 1 micron, the signal loss is greater, and it is not sensitive to the smoke particles in this area, which will cause Fire alarm delay and omission
The technical solution proposed by US08269639 is the perfection of US07724367. On the one hand, the technical solution proposes that the upper limit of smoke particles can be modified from 1 micron to other smaller values, such as 0.8 micron, to meet the needs of different detection environments ; On the other hand, this technical solution repairs the signal loss mentioned above through the particle size, so that the repaired signal is close to signal 1; in fact, it is impossible to repair the damaged signal. In the mixed measurement, the size of the smoke particles cannot be accurately obtained, so the problem of delayed and missed fire alarms in US07724367 still exists
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[0033] exist figure 1 , the flow chart includes the method for identifying and counting smoke particles in the present invention. The logical analysis is based on the fact that S1 and S2 come from different wavelengths. Default value △S P It is used to control the size of particle concentration change. In theory, △S P The smaller the value, the higher the accuracy of the identified smoke particle concentration. In practice, affected by data sampling and processing, △S P If it is too small, the error will be relatively large. Generally, it is set between 1 / 4-1 / 2 of the fire alarm threshold. Due to the smoke concentration S M , non-smog concentration S D In the accumulation operation, there may be negative values, but there is no negative value in the actual environment, so a zero-setting correction operation is added.
[0034] exist figure 2 In, △S 1 Produced by blue light, according to the previously mentioned uncorrelated single scattering principle, with S 1 same ...
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Abstract
The invention provides a method and a device for identifying and measuring smoke particles, which utilizes an incoherent principle that smoke iron dust is scattered at a certain quantity concentration and a utilization environment that smoke particles are gradually generated in a manner of developing from nothing to receive particle scattering light with different wavelengths or different angles through continuously detecting changes of comprehensive concentrations of the smoke particles and non-smoke particles, so as to identify and measure the concentration of the smoke particles, greatly reduce the interference of the non-smoke particles, reduce incorrect fire alarming, keep the relative sensitivity of the concentration of the smoke particles unchanged, reduce the conditions of delayed alarming and missed alarming of fire alarms and improve the reliability of fire disaster early warning. The method and the device not only can be used for a common photoelectric smoke sensing probe and can also be used in extremely-early fire disaster early warning, so that the application range of an extremely-early product is widened.
Description
technical field [0001] The invention relates to the field of fire early warning, in particular to a method and device for identifying and measuring smoke particles using photoelectric technology. Background technique [0002] In the field of fire early warning, reducing late reports, eliminating missed reports, reducing false alarms, and striving for early, accurate and reliable intelligent detection is the development direction of fire early warning technology. Compared with other technologies, such as ions, flames, smoke, and sound, photoelectric detection technology has the advantages of high sensitivity, environmental protection, and low cost, so it is currently the most widely used. According to different air sampling methods, photoelectric detection methods are divided into active and passive methods. The passive way is to use the air convection in the monitoring area to detect smoke particles, the response speed is slow, and the air flow detection is easily disturbed...
Claims
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IPC IPC(8): G01N15/06
Inventor 乐志明
Owner 乐志明