CN104880392A - PM2.5 (particulate matter 2.5) detection warning device and method - Google Patents
PM2.5 (particulate matter 2.5) detection warning device and method Download PDFInfo
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- CN104880392A CN104880392A CN201510316332.5A CN201510316332A CN104880392A CN 104880392 A CN104880392 A CN 104880392A CN 201510316332 A CN201510316332 A CN 201510316332A CN 104880392 A CN104880392 A CN 104880392A
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Abstract
The invention discloses a PM2.5 (particulate matter 2.5) detection warning device and method. The device comprises a PM2.5 cutter, a drier, an optical measuring cavity, a central processing unit, a storage module and a warning module, wherein the optical measuring cavity comprises a filtering membrane, a laser detector, a gathering lens and a photoelectric detector which are arranged in the cavity; the output end of the PM2.5 cutter is connected with the filtering membrane arranged in the optical measuring cavity through the drier; laser given out by the laser detector passes through the filtering membrane and is then gathered to the photoelectric detector through the gathering lens; the photoelectric detector is connected with the central processing unit. The device and the method adopt a laser scattering method for measuring the PM2.5 concentration, so that the cost is greatly reduced, the manual operation is not needed, the efficiency is high, the influence by temperature and humidity is small, and the detection precision is high; in addition, a PM2.5 detection technology is combined with a warning technology; a wireless transmission module and the warning module are adopted; relevant units and individuals can be timely notified when the PM2.5 concentration exceeds the standard; the body health of users can be favorably protected.
Description
Technical field
The present invention relates to a kind of PM2.5 detection alarm device and method, belong to field of photoelectric technology.
Background technology
PM2.5 refers to that in air, diameter is less than or equal to the particle of 2.5 microns, also referred to as entering lung particle.Compared with larger Atmospheric particulates, PM2.5 particle diameter is little, is rich in a large amount of poisonous and harmful substances and residence time is in an atmosphere long, fed distance is far away, thus larger on the impact of health and atmosphere quality.
1/20 size of the not enough human tau hair of diameter of PM2.5, is not easily stopped by the fine hair of nasal cavity.Directly can enter bronchus after being inhaled into human body, the gas exchanges of interference lung, causes the disease comprising the aspects such as asthma, bronchitis and cardiovascular disease.Such as: cough, expiratory dyspnea, the pulmonary function that reduces, exacerbate asthma, cause chronic bronchitis, arrhythmia cordis, non-lethal heart disease, heart and lung diseases patient too early dead.In addition, PM2.5 exceeds standard and also can cause many adverse effects to the aspect such as weather, traffic.
Traditional PM2.5 detector adopts filter membrane weight method, β attenuation sensors usually, micro-oscillating balance method detects the content of PM2.5 in air.Filter membrane weight method comparatively accurately can measure the content of PM2.5 in air, but needs manual operation, when program is loaded down with trivial details, can not realize automatic detection, and can not reflect the short time situation of change of PM2.5 concentration.β attenuation sensors, can detect in real time, automatically, but production cost is high, has β x radiation x to endanger.The shortcoming of trace oscillating balance method is that equipment is comparatively large and cost is higher, and inconvenient as outdoor flow measurement, to air humidity sensitive, temperature influence is larger.In addition, what on market, existing PM2.5 detector realized is single measuring ability, does not realize warning function.
Summary of the invention
Technical matters to be solved by this invention is: provide a kind of PM2.5 detection alarm device, adopts laser scattering method to detect PM2.5 content, detects degree of accuracy high, and little by the impact of humiture.
The present invention is for solving the problems of the technologies described above by the following technical solutions:
A kind of PM2.5 detection alarm device, comprise PM2.5 cutter, exsiccator, optical measurement chamber, central processing unit, memory module, alarm module, described optical measurement chamber comprises the filter membrane be arranged in chamber, laser detector, plus lens, photodetector; The output terminal drying device of described PM2.5 cutter is connected with the filter membrane in optical measurement chamber, and the laser that laser detector sends, after filter membrane, is converged to photodetector by plus lens, and photodetector is connected with central processing unit; Memory module, alarm module are connected with central processing unit respectively;
Gas to be measured successively through PM2.5 cutter, exsiccator laggard enter optical measurement chamber, membrane filtration PM2.5 particle in chamber, the laser that laser detector sends is after filter membrane, converged to photodetector by plus lens, photodetector exports central processing unit to after light signal is converted into electric signal.
As further embodiment of the present invention, this device also comprises display module, and described display module is connected with central processing unit.
As further embodiment of the present invention, this device also comprises wireless transport module, and described wireless transport module is connected with central processing unit.
As the preferred embodiments of the present invention, described alarm module is with at least one in lower device: hummer, display lamp.
As the preferred embodiments of the present invention, described display module is liquid crystal display.
A kind of PM2.5 detection alarm method, utilize PM2.5 detection alarm device described above to realize, detect the PM2.5 concentration value in gas to be measured, and this detectable concentration value and the PM2.5 normal concentration value prestored are compared, when detectable concentration value is greater than normal concentration value, send warning; When detectable concentration value is less than or equal to normal concentration value, do not report to the police.
The present invention adopts above technical scheme compared with prior art, has following technique effect:
1, PM2.5 detection alarm device and method of the present invention, adopt laser scattering method to measure PM2.5 concentration and cost is greatly reduced, do not need manual operation, efficiency is high, and little by the impact of humiture, detects degree of accuracy high.
2, PM2.5 detection alarm device and method of the present invention; PM2.5 detection technique is combined with alarm technique; adopt wireless transport module and alarm module, relevant unit and individual can be notified in time when PM2.5 concentration over-standard, be conducive to the healthy of protection user.
3, PM2.5 detection alarm device and method of the present invention, structure is simple, convenient and practical.
Accompanying drawing explanation
Fig. 1 is the integrated stand composition of PM2.5 detection alarm device of the present invention.
Fig. 2 is the structural representation in optical measurement chamber in the present invention.
Embodiment
Be described below in detail embodiments of the present invention, the example of described embodiment is shown in the drawings, and wherein same or similar label represents same or similar element or has element that is identical or similar functions from start to finish.Being exemplary below by the embodiment be described with reference to the drawings, only for explaining the present invention, and can not limitation of the present invention being interpreted as.
As shown in Figure 1, a kind of PM2.5 detection alarm device, comprises PM2.5 cutter, exsiccator, light
Learn and measure chamber, central processing unit, display module, memory module, alarm module and wireless transport module, PM2.5 cutter drying device is connected with optical measurement chamber, and optical measurement chamber, display module, memory module, alarm module and wireless transport module are connected with central processing unit respectively.
Flow be the ambient air sampling of 1 cubic metre per hour through PM2.5 cutter, the PM10 dust contained by filtering, become coincidence measurement require PM2.5 aerosol sample gas.
Sample gas enters in exsiccator and carries out, without hot solids drying, the relative humidity of gas being controlled below 35%.
Optical measurement has laser detector in chamber, and when dried gas enters optical measurement chamber, particle is collected on the filter membrane that can automatically change.Along with the carrying out of sample gas collection, the particle that filter membrane is collected gets more and more, and particle quality also increases thereupon.When the laser that laser detector sends is by the filter membrane that deposits particle, the energy attenuation of laser, by just calculating the concentration of particle to the mensuration of damping capacity.
Due to the change of the particle on the filter membrane that the output signal of laser detector can directly be reacted before and after collected specimens, central processing unit obtains the particulate matter numerical quantity gathered in certain period by the signal intensity analyzing laser detector, after its process, obtain PM2.5 concentration information.Central processing unit controls display module display PM2.5 concentration data, by wireless transport module, PM2.5 concentration is sent to relevant unit and individual.The normal concentration value stored in the PM2.5 concentration value detected and memory module compares by central processing unit, judges whether concentration value exceeds alarm limit, and when concentration is in normal condition, the green light that central processing unit controls alarm module is long bright; When concentration exceedes limit value, central processing unit then starts warning device, makes hummer send chimes of doom, control LED red lamp flass, makes light emitting diode continue flicker (manually can reset).
Display module can adopt liquid crystal display, and display module shows the information such as PM2.5 concentration and time detected.These data are delivered to display module display by the PM2.5 concentration data that central processing unit is sent here according to photodetector.
Wireless transport module is used for PM2.5 concentration information to be sent to relevant unit or individual.After the PM2.5 concentration data detected is transferred to central processing unit by photodetector, controls wireless transport module by central processing unit and these data are sent to relevant unit and individual.
Alarm module is made up of the circuit such as hummer and light emitting diode, for reporting to the police.When the PM2.5 detection quality of data exceeds standard, central processing unit sends instruction and controls alarm module warning, and alarm module is sounded and reported to the police and adjoint LED red lamp flass.
Above embodiment is only and technological thought of the present invention is described, can not limit protection scope of the present invention with this, and every technological thought proposed according to the present invention, any change that technical scheme basis is done, all falls within scope.
Claims (6)
1. a PM2.5 detection alarm device, it is characterized in that: comprise PM2.5 cutter, exsiccator, optical measurement chamber, central processing unit, memory module, alarm module, described optical measurement chamber comprises the filter membrane be arranged in chamber, laser detector, plus lens, photodetector; The output terminal drying device of described PM2.5 cutter is connected with the filter membrane in optical measurement chamber, and the laser that laser detector sends, after filter membrane, is converged to photodetector by plus lens, and photodetector is connected with central processing unit; Memory module, alarm module are connected with central processing unit respectively;
Gas to be measured successively through PM2.5 cutter, exsiccator laggard enter optical measurement chamber, membrane filtration PM2.5 particle in chamber, the laser that laser detector sends is after filter membrane, converged to photodetector by plus lens, photodetector exports central processing unit to after light signal is converted into electric signal.
2. PM2.5 detection alarm device as claimed in claim 1, it is characterized in that: this device also comprises display module, described display module is connected with central processing unit.
3. PM2.5 detection alarm device as claimed in claim 1, it is characterized in that: this device also comprises wireless transport module, described wireless transport module is connected with central processing unit.
4. PM2.5 detection alarm device as claimed in claim 1, is characterized in that: described alarm module is with at least one in lower device: hummer, display lamp.
5. PM2.5 detection alarm device as claimed in claim 2, is characterized in that: described display module is liquid crystal display.
6. a PM2.5 detection alarm method, PM2.5 detection alarm device is as claimed in claim 1 utilized to realize, it is characterized in that: detect the PM2.5 concentration value in gas to be measured, and this detectable concentration value and the PM2.5 normal concentration value prestored are compared, when detectable concentration value is greater than normal concentration value, send warning; When detectable concentration value is less than or equal to normal concentration value, do not report to the police.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN106442239A (en) * | 2016-08-25 | 2017-02-22 | 浙江吉利控股集团有限公司 | Airborne suspended particulate concentration detection device and method applied to automobile |
| CN106979913A (en) * | 2016-10-28 | 2017-07-25 | 杭州克霾环保科技有限公司 | Survey haze device and include the particulate matter detector of the survey haze device |
| CN109975186A (en) * | 2019-04-18 | 2019-07-05 | 无锡豪帮高科股份有限公司 | A kind of PM2.5 laser sensor |
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| CN106442239A (en) * | 2016-08-25 | 2017-02-22 | 浙江吉利控股集团有限公司 | Airborne suspended particulate concentration detection device and method applied to automobile |
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