CN102841044A - Beta-ray atmospheric particulate monitor and monitoring method thereof - Google Patents
Beta-ray atmospheric particulate monitor and monitoring method thereof Download PDFInfo
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- CN102841044A CN102841044A CN2012103334823A CN201210333482A CN102841044A CN 102841044 A CN102841044 A CN 102841044A CN 2012103334823 A CN2012103334823 A CN 2012103334823A CN 201210333482 A CN201210333482 A CN 201210333482A CN 102841044 A CN102841044 A CN 102841044A
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Abstract
The invention provides a beta-ray atmospheric particulate monitor with high monitoring efficiency and high monitoring precision as well as a monitoring method of the Beta-ray atmospheric particulate monitor. The beta-ray atmospheric particulate monitor comprises a whirlwind sampling head, a dehydrating device, a particulate collecting hole, a paper tape transmission device and a flow sensor, wherein the dehydrating device is located below the whirlwind sampling head; the particulate collecting hole is located below the dehydrating device; the paper tape transmission device is used for moving the paper tape; the flow sensor is located below the dehydrating device and the paper tape; the flow sensor is connected with an automatic throttle which is connected with a vacuum pump; the flow sensor is connected with a main control circuit; a C14 radioactive source is arranged at one side of the dehydrating device; beta-ray detectors are arranged below the C14 radioactive source and the paper tape; the beta-ray detectors are connected with a signal processing unit which is connected with the main control circuit; and the main control circuit is also connected with a display, the dehydrating device and the paper tape transmission device.
Description
Technical field
The present invention relates to a kind of monitor, especially a kind of β ray atmosphere particle monitoring appearance and monitoring method thereof.
Background technology
Atmospheric pollution is to be caused by the pollutant that is present in one or more gaseous states, gasoloid or graininess in the atmosphere, can to the people and other biological damages or unusual effect.Atmospheric pollution wide material sources, coverage are big, have become worldwide problem at present.
Atmosphere pollution mainly gets into human body through respiratory tract.Varying in size of particle diameter, the position that is inhaled into and is deposited on respiratory system is different, and is also variant to the harm of body.Greater than the upper airway that is trapped in of 5 μ m, be trapped in bronchiole and alveolar less than 5 μ m more more.Particle is more little, and the position of entering is dark more.In recent years discover that (PM2.5) is serious to health effects for particulate.Here said particulate is the particle of diameter≤2.5 μ m, forms through two amicrons that chemical conversion generates by directly entering an airborne amicron and airborne gaseous contaminant.Particulate is the same with flue dust can to arrive lung's end, and stable after the sedimentation.
In China big city; The PM2.5 of outdoor overall situation is mainly derived from smog and motor-vehicle tail-gas of fuel combustion etc.; In recent years along with quickening, the rapid increase of motor vehicle quantity of China's rapid economy development, process of industrialization; Particularly the pollution of particulate (PM2.5) is more and more serious to make China's atmospheric pollution, people ' s health, meteorology has been produced seriously influence.
The extensive monitoring method that adopts in countries in the world mainly is gravimetric method, β radiation absorption method and trace vibration sedimentation balance method at present.β radiation absorption method atmosphere particle monitoring appearance is one of main monitoring instrument of pellet in present China measurement atmosphere, and the BAM 1020 that U.S. Met One company produces belongs to this quasi-instrument with the FH62C14 series particle monitoring instrument that Thermo company produces.The problem that the FH62C14 series particle monitoring instrument that Thermo company produces exists is that beta counter is positioned under the particle collection mouth; The counter test surface is exposed under the 16.7L/min air-flow in sampling process; The damage of counter and the pollution of test surface be can quicken, counter serviceable life and detection efficiency influenced; The problem that the BAM 1020 serial particle monitoring instruments that Met One company produces exist is that existing paper advance mechanism is to rotate the drive paper tape through claw-pole motor to move; The precision that paper tape moves is rotated the number of turns through the last item that links to each other with claw-pole motor and is reached, and therefore receives factor affecting such as machining accuracy, paper tape degree of tightness.Two kinds of instruments adopt traditional heating mode simultaneously, can lose airborne organic volatile, influence test result.
Summary of the invention
The invention provides a kind of efficient height, β ray atmosphere particle monitoring appearance and monitoring method thereof that monitoring accuracy is high of monitoring.
Realize the β ray atmosphere particle monitoring appearance of one of the object of the invention; Comprise the cyclone type sampling head, be positioned at the dehydrating unit of cyclone type sampling head below, be positioned at the particle collection hole of dehydrating unit below; Be used for moving the paper tape gearing of paper tape; Be positioned at the flow sensor of dehydrating unit and paper tape below, said flow sensor connects automatic throttle, and said automatic throttle connects vacuum pump; Said flow sensor connects governor circuit, and said dehydrating unit one side is provided with C
14Radioactive source, said C
14Radioactive source and paper tape below are provided with βShe Xiantanceqi; Said βShe Xiantanceqi connects signal processing circuit, and said signal processing circuit connects governor circuit, and said governor circuit also connects display, dehydrating unit and paper tape gearing.
The above and below of said dehydrating unit respectively is provided with a humidity sensor, and said humidity sensor links to each other with governor circuit.
Said dehydrating unit comprises a cartridge heater and the discolour silica gel tube that the discolour silica gel drying agent is housed.
Said paper tape gearing comprises two folding and unfolding paper tape motors, two motor verticals, cross motor, slide rail; Said motor vertical is connected with hold down gag; Said slide rail is provided with two limiting photoelectric switch; Said cross motor connects two support wheels, and said support wheel is provided with baffle plate, and baffle plate is provided with the judgement optoelectronic switch.
Realize the monitoring method of two the β ray atmosphere particle monitoring appearance of the object of the invention; Flow control system adopts sampling volume in three seconds average discharge volume calculation sampling times of accumulative total; Be that flow sensor is monitored gas flow; Instantaneous delivery value of every 10ms record; And the flow value that writes down in the 3s is carried out arithmetic mean and time 3s multiply each other and obtain sampling volume in the 3s, the sampling volume that write down every 3s in the sampling time at 1h adds up and obtains in the sampling time sampling volume always, with total sampling volume as PM2.5, PM10 mass concentration calculating parameter.
Adopting the humidity sensor monitoring is ambient humidity and through the air humidity behind the dehydrating unit through the air humidity before the dehydrating unit, when the humidity after the dehumidifying greater than 30%～40% the time, heating arrangement begins heating and realizes dynamic heat control; Or the humidity after ambient humidity deducts dehumidifying judges that the discolour silica gel tube is in failure state greater than 10% the time, and heating arrangement begins heating, realizes dehumidifying on the one hand, discolour silica gel is dehumidified accomplish the selfreparing of discolour silica gel on the other hand.
The beneficial effect of β ray atmosphere particle monitoring appearance of the present invention and monitoring method thereof is following:
1, β ray atmosphere particle monitoring appearance of the present invention; Adopt the transverse movement structure; Thereby through with the coaxial optoelectronic switch 61 in particle collection mouth center and with the coaxial optoelectronic switch 91 of β ray detection window center accurately location paper tape movement positions reduced the measuring error that kinematic error causes, make the test result precision higher.
2, monitor of the present invention adopts and uses the dehydrating unit of discolour silica gel drying agent and heating simultaneously, and is equipped with the control technology of dynamic heat and failure analysis, has promptly reduced the loss of organic volatile, has realized that again dehumidification function makes instrument test according to accurate.
3, monitoring method of the present invention has adopted sampling volume accumulation calculating method; The PM2.5 particle can deposit on paper tape in the sampling process; Thereby resistance and gas stream flux are changed; Need the real-time regulated gas flow to guarantee the 16.7L/min sampling flow; Therefore sampling volume and the actual samples volume deviation with the 16.7L/min flow rate calculation sampling time is bigger, and it is more accurate that the 3s sampling volume accumulation calculating method that the present invention adopts obtains ground sampling volume Q, thereby has improved the accuracy of mass concentration result of calculation.
Description of drawings
Fig. 1 is the structural representation of β ray atmosphere particle monitoring appearance of the present invention.
Fig. 2 is the paper tape transmission structures synoptic diagram of β ray atmosphere particle monitoring appearance of the present invention.
Fig. 3 is the support wheel structural representation of β ray atmosphere particle monitoring appearance of the present invention.
Fig. 4 be β ray atmosphere particle monitoring appearance of the present invention the limiting photoelectric switch structural representation.
Embodiment
Shown in Fig. 1～4, β ray atmosphere particle monitoring appearance of the present invention comprises cyclone type sampling head 1; Be positioned at the dehydrating unit of cyclone type sampling head 1 below; Be positioned at the particle collection hole 6 of dehydrating unit below, be used for moving the paper tape gearing 5 of paper tape 8, be positioned at the flow sensor 10 of dehydrating unit and paper tape 8 belows; Said flow sensor 10 connects automatic throttle 11, and said automatic throttle 11 connects vacuum pump 12; Said flow sensor 10 connects governor circuit 14, and said dehydrating unit one side is provided with C14 radioactive source 7, and said C14 radioactive source 7 is provided with βShe Xiantanceqi 9 with paper tape 8 belows; Said βShe Xiantanceqi 9 connects signal processing circuit 13, and said signal processing circuit 13 connects governor circuit 14, and said governor circuit 14 also connects display 15, dehydrating unit and paper tape gearing 5.
The above and below of said dehydrating unit respectively is provided with a humidity sensor 16, and said humidity sensor 16 links to each other with governor circuit 14.
Said dehydrating unit comprises a cartridge heater 4 and the discolour silica gel tube 3 that the discolour silica gel drying agent is housed.
Said paper tape gearing 5 comprises two folding and unfolding paper tape motors 501, two motor verticals 511, cross motor 513, slide rail 514; Said motor vertical 511 is connected with hold down gag 510; Said slide rail 14 is provided with two limiting photoelectric switch 17; Said cross motor 513 connects two support wheels 503, and said support wheel 503 is provided with baffle plate 504, and baffle plate 504 is provided with judges optoelectronic switch 505.
The course of work of β ray atmosphere particle monitoring appearance of the present invention is following:
Air is isolated the PM2.5 particle through cyclone type sampling head 1; Appearance is flowed through and is collected by paper tape 8 at 6 places, particle collection hole behind the dehydrating unit; Humidity sensor 16 is housed respectively before and after the dehydrating unit, the measurement of gas humidity before and after the dehydrating unit of flowing through, sampling power is provided by vacuum pump 12; And monitor the flow information feedback in real time to governor circuit 14 by flow sensor 10, and flow is adjusted so that stable 16.7L sampling flow to be provided by governor circuit 14 control automatic throttles.Paper tape gearing 5 is realized the folding and unfolding of paper tape and is laterally moved; At first in β ray detection window test paper strip substrate; C14 radioactive source 7 sends the β ray and passes paper tape and counted by βShe Xiantanceqi; And data are sent to β ray control and signal processing circuit 13, and will survey paper tape by governor circuit 14 control paper tape gearings 5 then and move to 6 places, particle collection hole and sample, after sampling finishes this paper tape position is moved back to β ray detection window place again and count; Pass result of detection back the control of β ray and signal processing circuit 13 equally; By this circuit front and back two secondary data are handled, and data are passed to governor circuit 14, carry out data analysis by governor circuit 14 at last and calculate and on display 15, show.
During paper tape 8 transverse movements, at first through paper tape retracting motor 501 paper tape is tightened up, after paper tape 8 tightens up, moved to the inside by support wheel 503, its back baffle plate 504 shelters from judges optoelectronic switch 505, judges that thus paper tape tightens up.Vertical movement motor 511 moved downward paper tape hold down gag 510 was compressed paper tape this moment; Paper tape retracting motor 501 is rotated and is loosened paper tape then; Support wheel 503 moves back to original position laterally, and its back baffle plate 504 leaves judges optoelectronic switch 505, judges that thus paper tape loosens.Cooperate slide rail 514 whole transverse moving devices of drive and paper tape at particle collection mouth and β ray detection window back and forth movement by transverse movement motor 513 at last; The improved collection of a β ray detection window place paper tape mouthful place samples; Sampling is accomplished the back paper tape and is moved back to β ray detection window place and detect, and paper tape is accurately located through realizing with the coaxial limiting photoelectric switch in particle collection mouth center with the coaxial limiting photoelectric switch of β ray detection window center.
The monitoring method of β ray atmosphere particle monitoring appearance of the present invention is following:
Flow control system is made up of flow sensor 10, automatic throttle 11 and vacuum pump 12, and has governor circuit 14 to control.Wherein automatic throttle 11 is made up of reducing motor and throttling valve, and through shaft joint the reducing motor axle is connected with the throttle valve adjustment axle, realizes flow regulation thereby rotate the adjusting that drives the throttling valve open cell content by motor shaft.Flow control system adopts sampling volume in three seconds average discharge volume calculation sampling times of accumulative total; Be that flow sensor is monitored gas flow; Instantaneous delivery value of every 10ms record; And the flow value that writes down in the 3s is carried out arithmetic mean and time 3s multiply each other and obtain sampling volume Q3s in the 3s, the sampling volume Q3s that write down every 3s in the sampling time at 1h adds up and obtains total sampling volume Q in the sampling time, and always sampling volume Q is as PM2.5, PM10 mass concentration calculating parameter.
On particle sample introduction pipeline, be furnished with a cover particle dehumidifying and control device and comprise 16, one cartridge heaters 4 of two humidity sensors and the discolour silica gel tube 3 that the discolour silica gel drying agent is housed, discolour silica gel is realized dehumidification function simultaneously with heating.Air humidity before the humidity sensor 16 monitoring process dehydrating units is the air humidity behind ambient humidity and the process dehydrating unit; Because volatile organic matter also is the target that we detect in the air; And it volatilizees easily in the back that is heated and loses; Therefore instrument does not heat under common state, only realizes the particle dehumidifying by the discolour silica gel drying agent.In relative humidity is 50% o'clock; Drying agent wettability >=28%; In relative humidity is 80% o'clock, and drying agent wettability >=25% is because humidity can have a strong impact on the PM2.5 testing result 40% when above; Therefore the humidity after the dehumidifying was greater than 30%～40% o'clock, and heating arrangement begins heating and realizes dynamic heat control; Because discolour silica gel can make wettability power descend along with absorption steam must increase; Therefore when ambient humidity deduct dehumidifying afterwards humidity greater than 10% the time; Decidable discolour silica gel tube is in failure state; This moment, heating arrangement began heating, realized dehumidification function on the one hand, discolour silica gel is dehumidified accomplish the selfreparing of discolour silica gel on the other hand.
Embodiment recited above describes preferred implementation of the present invention; Be not that scope of the present invention is limited; Design under the spiritual prerequisite not breaking away from the present invention; Various distortion and improvement that the common engineering technical personnel in this area make technical scheme of the present invention all should fall in the definite protection domain of claims of the present invention.
Claims (6)
1. β ray atmosphere particle monitoring appearance; It is characterized in that: comprise the cyclone type sampling head, be positioned at the dehydrating unit of cyclone type sampling head below, be positioned at the particle collection hole of dehydrating unit below; Be used for moving the paper tape gearing of paper tape; Be positioned at the flow sensor of dehydrating unit and paper tape below, said flow sensor connects automatic throttle, and said automatic throttle connects vacuum pump; Said flow sensor connects governor circuit, and said dehydrating unit one side is provided with the C14 radioactive source, and said C14 radioactive source and paper tape below are provided with βShe Xiantanceqi; Said βShe Xiantanceqi connects signal processing circuit, and said signal processing circuit connects governor circuit, and said governor circuit also connects display, dehydrating unit and paper tape gearing.
2. β ray atmosphere particle monitoring appearance according to claim 1, it is characterized in that: the above and below of said dehydrating unit respectively is provided with a humidity sensor, and said humidity sensor links to each other with governor circuit.
3. β ray atmosphere particle monitoring appearance according to claim 1 is characterized in that: said dehydrating unit comprises a cartridge heater and the discolour silica gel tube that the discolour silica gel drying agent is housed.
4. according to the arbitrary described β ray atmosphere particle monitoring appearance of claim 1～3; It is characterized in that: said paper tape gearing comprises two folding and unfolding paper tape motors, two motor verticals, cross motor, slide rail; Said motor vertical is connected with hold down gag, and said slide rail is provided with two limiting photoelectric switch, and said cross motor connects two support wheels; Said support wheel is provided with baffle plate, and baffle plate is provided with the judgement optoelectronic switch.
5. according to the monitoring method of the arbitrary described β ray atmosphere particle monitoring appearance of claim 1～4; It is characterized in that: said flow control system adopts sampling volume in three seconds average discharge volume calculation sampling times of accumulative total; Be that flow sensor is monitored gas flow; Instantaneous delivery value of every 10ms record; And the flow value that writes down in the 3s is carried out arithmetic mean and time 3s multiply each other and obtain sampling volume in the 3s, the sampling volume that write down every 3s in the sampling time at 1h adds up and obtains in the sampling time sampling volume always, with total sampling volume as PM2.5, PM10 mass concentration calculating parameter.
6. the monitoring method of β ray atmosphere particle monitoring appearance according to claim 5; It is characterized in that: adopting the humidity sensor monitoring is ambient humidity through the air humidity before the dehydrating unit; With the air humidity behind the process dehydrating unit; Humidity after dehumidifying is greater than 30%～40% the time, and heating arrangement begins heating and realizes dynamic heat control; Or the humidity after ambient humidity deducts dehumidifying judges that the discolour silica gel tube is in failure state greater than 10% the time, and heating arrangement begins heating.
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Cited By (20)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103712898A (en) * | 2013-07-30 | 2014-04-09 | 戴艺 | Atmosphere suspended particulate matter mass concentration detector |
| CN104089861A (en) * | 2014-07-07 | 2014-10-08 | 南通恒力医药设备有限公司 | Heating and dehumidifying device applicable to dust detector |
| CN104502247A (en) * | 2014-12-24 | 2015-04-08 | 上海斐讯数据通信技术有限公司 | Air quality detection system based on mobile terminal and detection method |
| CN104677796A (en) * | 2015-03-18 | 2015-06-03 | 深圳睿境环保科技有限公司 | Ultra-low concentration particulate matter online monitoring instrument and monitoring method |
| CN104819919A (en) * | 2015-05-20 | 2015-08-05 | 北京曼德克环境科技有限公司 | Detector for content of discharged particulate matter |
| CN105547947A (en) * | 2015-09-23 | 2016-05-04 | 中国石油大学(北京) | Light reflection difference device and method for detecting PM2.5 |
| CN105699608A (en) * | 2016-04-12 | 2016-06-22 | 上海巨浪环保科技发展有限公司 | Online air quality detector |
| CN107402172A (en) * | 2017-07-27 | 2017-11-28 | 中绿环保科技股份有限公司 | Automatic filter membrane clamping device in PM2.5 particle monitoring instruments |
| CN107421858A (en) * | 2017-06-15 | 2017-12-01 | 中国科学技术大学 | Portable type electronic product and its microparticle thing sensing device |
| CN107449685A (en) * | 2017-08-17 | 2017-12-08 | 青岛众瑞智能仪器有限公司 | A kind of integrated β rays dust concentration direct-reading measurement device |
| CN108190576A (en) * | 2017-12-29 | 2018-06-22 | 深圳市华唯计量技术开发有限公司 | A kind of transfer assembly and particle concentration detection device and detection method |
| CN108593510A (en) * | 2018-05-08 | 2018-09-28 | 南京江宁分析仪器有限公司 | Smokescope expeditionary test set and its test method |
| CN108709840A (en) * | 2018-07-28 | 2018-10-26 | 太原海纳辰科仪器仪表有限公司 | A kind of β rays particle concentration monitor |
| CN109856017A (en) * | 2019-04-03 | 2019-06-07 | 宇星科技发展(深圳)有限公司 | Particulate matter analyzer and its method for monitoring paper tape surplus |
| CN111751173A (en) * | 2019-03-27 | 2020-10-09 | 合肥福瞳光电科技有限公司 | Single-sampling-rod double-channel atmospheric particulate monitor and monitoring method |
| CN111896440A (en) * | 2020-07-22 | 2020-11-06 | 福州隆鹃电子科技有限公司 | Air quality detection device with automatic loading function for broken tape of tape paper |
| CN112098285A (en) * | 2020-09-10 | 2020-12-18 | 天津同阳科技发展有限公司 | Volatile particulate matter compensation measuring device and method based on beta-ray method |
| CN112198098A (en) * | 2020-10-14 | 2021-01-08 | 青岛明德环保仪器有限公司 | Particulate matter concentration detection device based on beta-ray method |
| CN112630142A (en) * | 2020-12-15 | 2021-04-09 | 洁云环保技术(苏州)有限公司 | Humidity monitor for environmental monitoring |
| CN112730179A (en) * | 2020-12-23 | 2021-04-30 | 天津智易时代科技发展有限公司 | Portable beta-ray in-situ online monitor and monitoring method |
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| CN103712898A (en) * | 2013-07-30 | 2014-04-09 | 戴艺 | Atmosphere suspended particulate matter mass concentration detector |
| CN104089861A (en) * | 2014-07-07 | 2014-10-08 | 南通恒力医药设备有限公司 | Heating and dehumidifying device applicable to dust detector |
| CN104502247A (en) * | 2014-12-24 | 2015-04-08 | 上海斐讯数据通信技术有限公司 | Air quality detection system based on mobile terminal and detection method |
| CN104677796A (en) * | 2015-03-18 | 2015-06-03 | 深圳睿境环保科技有限公司 | Ultra-low concentration particulate matter online monitoring instrument and monitoring method |
| CN104819919A (en) * | 2015-05-20 | 2015-08-05 | 北京曼德克环境科技有限公司 | Detector for content of discharged particulate matter |
| CN104819919B (en) * | 2015-05-20 | 2017-11-21 | 北京曼德克环境科技有限公司 | A kind of granular material discharged content detection instrument |
| CN105547947A (en) * | 2015-09-23 | 2016-05-04 | 中国石油大学(北京) | Light reflection difference device and method for detecting PM2.5 |
| CN105699608A (en) * | 2016-04-12 | 2016-06-22 | 上海巨浪环保科技发展有限公司 | Online air quality detector |
| CN107421858A (en) * | 2017-06-15 | 2017-12-01 | 中国科学技术大学 | Portable type electronic product and its microparticle thing sensing device |
| CN107402172A (en) * | 2017-07-27 | 2017-11-28 | 中绿环保科技股份有限公司 | Automatic filter membrane clamping device in PM2.5 particle monitoring instruments |
| CN107449685A (en) * | 2017-08-17 | 2017-12-08 | 青岛众瑞智能仪器有限公司 | A kind of integrated β rays dust concentration direct-reading measurement device |
| CN108190576A (en) * | 2017-12-29 | 2018-06-22 | 深圳市华唯计量技术开发有限公司 | A kind of transfer assembly and particle concentration detection device and detection method |
| WO2019127851A1 (en) * | 2017-12-29 | 2019-07-04 | 深圳市华唯计量技术开发有限公司 | Conveying assembly, and particulate matter concentration detection device and method |
| CN108593510A (en) * | 2018-05-08 | 2018-09-28 | 南京江宁分析仪器有限公司 | Smokescope expeditionary test set and its test method |
| CN108593510B (en) * | 2018-05-08 | 2024-03-01 | 南京江宁分析仪器有限公司 | Smoke concentration detection test device and test method thereof |
| CN108709840A (en) * | 2018-07-28 | 2018-10-26 | 太原海纳辰科仪器仪表有限公司 | A kind of β rays particle concentration monitor |
| CN108709840B (en) * | 2018-07-28 | 2024-04-05 | 太原海纳辰科仪器仪表有限公司 | Beta-ray particulate matter concentration monitor |
| CN111751173A (en) * | 2019-03-27 | 2020-10-09 | 合肥福瞳光电科技有限公司 | Single-sampling-rod double-channel atmospheric particulate monitor and monitoring method |
| CN109856017A (en) * | 2019-04-03 | 2019-06-07 | 宇星科技发展(深圳)有限公司 | Particulate matter analyzer and its method for monitoring paper tape surplus |
| CN109856017B (en) * | 2019-04-03 | 2024-04-26 | 广东盈峰科技有限公司 | Particle analyzer and method for monitoring paper tape allowance thereof |
| CN111896440B (en) * | 2020-07-22 | 2021-05-04 | 江苏智慧工场技术研究院有限公司 | Air quality detection device with automatic loading function for broken tape of tape paper |
| CN111896440A (en) * | 2020-07-22 | 2020-11-06 | 福州隆鹃电子科技有限公司 | Air quality detection device with automatic loading function for broken tape of tape paper |
| CN112098285B (en) * | 2020-09-10 | 2021-04-06 | 天津同阳科技发展有限公司 | Volatile particulate matter compensation measuring device and method based on beta-ray method |
| CN112098285A (en) * | 2020-09-10 | 2020-12-18 | 天津同阳科技发展有限公司 | Volatile particulate matter compensation measuring device and method based on beta-ray method |
| CN112198098A (en) * | 2020-10-14 | 2021-01-08 | 青岛明德环保仪器有限公司 | Particulate matter concentration detection device based on beta-ray method |
| CN112198098B (en) * | 2020-10-14 | 2022-09-27 | 青岛明华电子仪器有限公司 | Particulate matter concentration detection device based on beta-ray method |
| CN112630142A (en) * | 2020-12-15 | 2021-04-09 | 洁云环保技术(苏州)有限公司 | Humidity monitor for environmental monitoring |
| CN112730179A (en) * | 2020-12-23 | 2021-04-30 | 天津智易时代科技发展有限公司 | Portable beta-ray in-situ online monitor and monitoring method |
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Application publication date: 20121226 |