CN205958420U - Light scattering particulate matter concentration detection device - Google Patents
Light scattering particulate matter concentration detection device Download PDFInfo
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- CN205958420U CN205958420U CN201620838790.5U CN201620838790U CN205958420U CN 205958420 U CN205958420 U CN 205958420U CN 201620838790 U CN201620838790 U CN 201620838790U CN 205958420 U CN205958420 U CN 205958420U
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Abstract
The utility model discloses a light scattering particulate matter concentration detection device, including sample gas sampling system, optical measurements system, circuit control system, adopt 90 degrees laser light scattering principles, sampling gas pulsation is through the photaesthesia zone time of an uniform illumination, dust particle in the air current produces the scattered light, scattered light flux in the certain limit is collected and is projected on the photoelectric converter, provide the particle diameter of being surveyed the particle by photoelectric converter output with the signal of telecommunication certain proportional relation of particle diameter one -tenth after electronic system processing thereafter, then the counting channel that the input corresponds is counted, thereby measure in the air particulate matter concentration and provide the air cleanliness rank.
Description
Technical field
This utility model is related to a kind of optical scatter thing concentration detection apparatus, belongs to on-line checking field.
Background technology
The open polluter that dust on ground flies upward and enters air in wind-force, artificial drive and other drive is ring
The important component part of border total Suspended Particle in The Air.Its harm shows：Keep the sun off, reduce air visibility, impact
Traffic；The various poisonous and harmful substance of airborne dust granule contamination invades respiratory tract, easily causes pharyngolaryngitis, bronchitis and pulmonary infection
Etc. disease.Airborne dust particulate matter is broadly divided into dust on the roads, construction fugitive dust, stockyard airborne dust etc., belongs to inorganization polluter, for city
The contribution rate of city PM2.5 is even up to 30% sometimes, and difficulty of prevention and cure is very big, lacks become more meticulous monitoring and management, is also national environmental protection
The emphasis problem of portion 12 planning.
The method of airborne dust particle monitoring has many kinds, and on market, the measuring method of comparative maturity has manual weight method, β
Ray method, light scattering method.Manual weight method is unable to real time on-line monitoring, although β ray method can be with on-line monitoring, ray method
Measuring method be measurement integration process, one-shot measurement result needs the cumulative time of minimum half an hour, and some occasions
Airborne dust concentration change be a fast change procedure it is therefore desirable to online real-time under the occasion of monitoring, light being usually used and dissipates
The principle penetrated measures.
Utility model content
The purpose of this utility model is to provide a kind of optical scatter thing concentration detection apparatus, can on-line measurement simultaneously not
With the particle concentration of particle diameter, Urban Building Construction place, Industrial Enterprise Factory Boundary, construction boundary, social life can be widely used in
Etc. occasion particulate matter real time on-line monitoring, can instantaneously go out value and PM1, PM2.5, PM10 and TSP can be monitored simultaneously.
For achieving the above object, this utility model employs technical scheme below：
A kind of optical scatter thing concentration detection apparatus it is characterised in that：Include sample gas sampling system, optical measurement system
System, circuit control system；Described sample gas sampling system includes optical measurement chamber, positioned at the both sides screw thread respectively in optical measurement chamber
It is connected with air inlet pipe, escape pipe, form gas circuit between air inlet pipe, escape pipe, the top in optical measurement chamber is installed with sphere
Reflecting mirror, the lower end in optical measurement chamber is provided with scattered light pressure beam lens, and the lower surface of scattered light pressure beam lens is close to light electrical resistivity survey
Survey on device and be fixed in photodetector frock with trim ring, photodetector frock is connected with the lower end screw thread in optical measurement chamber
Connect, photodetector frock can adjust the distance between photodetector and spherical reflector；
Described optical measuring system includes laser diode, and the front light path of laser diode is sequentially provided with light
Source shaping lens group, light trapping, light source shaping lens group includes collimating lens, post lens, and described light path runs through optical measurement
Chamber；
Described laser diode transmitting has the light beam of certain angle of divergence, and light beam is shaped to flat by light source shaping lens group
Row light simultaneously carries out one-dimensional focusing, and the focus of light source shaping lens group falls in the intersection of light path light axis gentle Lu Zhizheng axle, light beam
Scattered light is sent on the airborne dust particle being irradiated in gas circuit, the scattered light signal of the partial angular extents of airborne dust particle passes through sphere
The scattered light signal of reflecting mirror and airborne dust particle own partial angular range, after scattered light pressure beam lens pressure beam, is collected
On the test surface of photodetector, remaining optical signal is absorbed by light trapping；
The signal output part of described photodetector is connected with circuit control system.
A kind of described optical scatter thing concentration detection apparatus it is characterised in that：Described spherical reflector is surveyed with optics
Amount passes through seal with O ring between chamber.
A kind of described optical scatter thing concentration detection apparatus it is characterised in that：Jiao of described light source shaping lens group
The long narrow ellipse light spot of major axis about 4mm short axle about 0.3mm is obtained at point.
A kind of described optical scatter thing concentration detection apparatus it is characterised in that：Described circuit control module includes
The preposition sampling amplification circuit that is sequentially connected electrically, two grades of discharge circuits, threshold comparator, trigger, multiple metering device, process
Device, processor is also connected with human-computer interaction module；The ultra-weak electronic signal of photodetector output is amplified, screens, counts,
Obtain the number of particles in the unit interval by counting scattered light signal pulse number thus the quality of inverting airborne dust particle is dense
Degree or Particle density, the particle of different-grain diameter scope is divided different passages to be counted, and has reached the different grains of online measurement simultaneously
The purpose of the airborne dust particle concentration of footpath section.
A kind of described optical scatter thing concentration detection apparatus it is characterised in that：The reflecting surface of described spherical reflector
It is coated with golden film, improve reflection efficiency.
A kind of described optical scatter thing concentration detection apparatus it is characterised in that：Described light trapping adopts bell to tie
Structure.
A kind of described optical scatter thing concentration detection apparatus it is characterised in that：Described optical measurement intracavity portion is whole
Carry out blackening process, reduce stray light.
A kind of described optical scatter thing concentration detection apparatus it is characterised in that：The internal diameter of described air inlet pipe 2mm～
It is ensured that can be measured that simple grain subsignal in the range of finite concentration in the range of 3mm.
Operation principle of the present utility model is：
After the collimated collimated of laser beam that laser instrument sends, by post lens mirror one-dimensional focusing in optical measurement intracavity light
Sensitizing range, focal line is located in illuminator optical axis and the plane of scattering light collecting system optical axis composition, and perpendicular to airflow direction
(adopting right angle orientation to scatter collection form).Laser beam enters light trapping after passing through light sensitive area, and is sponged by light trapping.
Indoor gas, under vacuum pumping action, enter optical measurement intracavity light sensitive area with certain flow by air inlet, work as in the air
When not having dust, laser beam will be fully absorbed by light trapping, and the photodiode of photodetector does not have light to inject, and no exports
Signal；When in the air has dust, laser beam will be irradiated to dust in light sensitive area, produce the scattering proportional to its size
Light, the scattered light in certain spatial angle range is reflected by spherical reflector, and the photodiode of photodetector has signal input,
Export the amplitude electric impulse signal proportional to particle size simultaneously, after subsequent conditioning circuit amplification, examination, counting
Granule number to tested in the air various particle diameter dust particle.
In circuit control system, preposition sampling amplification, coupling are carried out first to the ultra-weak electronic signal of photodetector output
Impedance between subsequent process circuit and detection device, the requirement to amplifier is low noise, high-gain, low output impedance, should
There are enough signal bandwidths and load capacity and good capacity of resisting disturbance；Two grades of discharge circuits adopt low noise, high common mode
The precision operational-amplifier of rejection ratio, pulse signal is amplified to appropriately sized, via threshold comparator compare pulse amplitude and
Enumerator stepping is delivered to processor after counting and is processed, and will show on human-computer interaction module during fructufy.
The utility model has the advantages that：
This utility model can on-line measurement different-size particles concentration simultaneously, Urban Building Construction field can be widely used in
The occasion particulate matter real time on-line monitorings such as ground, Industrial Enterprise Factory Boundary, construction boundary, social life.
Brief description
Fig. 1 is the front view of optical measuring system of the present utility model.
Fig. 2 is the top view of optical measuring system of the present utility model.
Fig. 3 is sample gas sampling system schematic diagram of the present utility model.
Fig. 4 is circuit control system schematic diagram of the present utility model.
Specific embodiment
This utility model is related to a kind of optical scatter thing concentration detection apparatus, can on-line measurement different-grain diameter section simultaneously
Particle concentration, is applied to airborne dust particulate matter real time on-line monitoring in ambient air.Specific embodiment coordinates accompanying drawing, describes in detail
As follows：
As Figure 1-4, a kind of optical scatter thing concentration detection apparatus, include sample gas sampling system, optical measurement
System, circuit control system；Sample gas sampling system includes optical measurement chamber 13, positioned at the both sides spiral shell respectively in optical measurement chamber 13
Stricture of vagina is connected with air inlet pipe 12, escape pipe 10, forms gas circuit 9 between air inlet pipe 12, escape pipe 10, and the top in optical measurement chamber 13 is solid
Dingan County, equipped with spherical reflector 4, is sealed by O-ring 11 between spherical reflector 4 and optical measurement chamber 13, optical measurement chamber 13
Lower end be provided with scattered light pressure beam lens 6, the lower surface of scattered light pressure beam lens 6 is close on photodetector 7 and uses trim ring
15 are fixed in photodetector frock 14, and photodetector frock 14 is threadeded with the lower end in optical measurement chamber 13, photoelectricity
Detector frock 14 can adjust the distance between photodetector 7 and spherical reflector 4；
Optical measuring system includes laser diode 1, and the front light path of laser diode 1 is sequentially provided with light source
Shaping lens group 8, light trapping 5, light source shaping lens group 8 includes collimating lens 2, post lens 3, and described light path runs through optics to be surveyed
Amount chamber 13；
Laser diode 2 transmitting has the light beam of certain angle of divergence, and light beam is shaped to parallel by light source shaping lens group 8
Light simultaneously carries out one-dimensional focusing, and the focus of light source shaping lens group 8 falls in the intersection of light path light axis and gas circuit 9 central shaft, light source
The focal point of shaping lens group 8 obtains the long narrow ellipse light spot of major axis about 4mm short axle about 0.3mm, and light beam is irradiated in gas circuit 9
Airborne dust particle on send scattered light, the scattered light signal of the partial angular extents of airborne dust particle pass through spherical reflector 4 and
The scattered light signal of airborne dust particle own partial angular range, after scattered light pressure beam lens pressure beam, collects photodetector
On 7 test surface, remaining optical signal is absorbed by light trapping；
The signal output part of photodetector 7 is connected with circuit control system, and circuit control module includes and is electrically connected successively
16, two grades of discharge circuits 17 of the preposition sampling amplification circuit connecing, threshold comparator 18, trigger 19, multiple metering device 20, process
Device 21, processor 21 is also connected with human-computer interaction module 22；The ultra-weak electronic signal of photodetector 7 output is amplified, discriminates
Not, count, by counting scattered light signal pulse number and obtaining number of particles in the unit interval thus inverting airborne dust particle
Mass concentration or Particle density, the particle of different-grain diameter scope is divided different passages to be counted, has reached and surveyed online simultaneously
The purpose of the airborne dust particle concentration of amount different-grain diameter section.
The reflecting surface of spherical reflector 4 is coated with golden film, improves reflection efficiency.
Light trapping 5 adopts taper mouth structure.
All carry out blackening process inside optical measurement chamber 13, reduce stray light.
The internal diameter of air inlet pipe 12 can be measured that in the range of 2mm～3mm it is ensured that in the range of finite concentration single-particle is believed
Number.
Claims (8)
1. a kind of optical scatter thing concentration detection apparatus it is characterised in that：Include sample gas sampling system, optical measurement system
System, circuit control system；Described sample gas sampling system includes optical measurement chamber, positioned at the both sides screw thread respectively in optical measurement chamber
It is connected with air inlet pipe, escape pipe, form gas circuit between air inlet pipe, escape pipe, the top in optical measurement chamber is installed with sphere
Reflecting mirror, the lower end in optical measurement chamber is provided with scattered light pressure beam lens, and the lower surface of scattered light pressure beam lens is close to light electrical resistivity survey
Survey on device and be fixed in photodetector frock with trim ring, photodetector frock is connected with the lower end screw thread in optical measurement chamber
Connect, photodetector frock can adjust the distance between photodetector and spherical reflector；
Described optical measuring system includes laser diode, the front light path of laser diode is sequentially provided with light source whole
Shape lens group, light trapping, light source shaping lens group includes collimating lens, post lens, and described light path runs through optical measurement chamber；
Described laser diode transmitting has the light beam of certain angle of divergence, and light beam is shaped to directional light by light source shaping lens group
And carrying out one-dimensional focusing, the focus of light source shaping lens group falls in the intersection of light path light axis gentle Lu Zhizheng axle, and light beam irradiates
Scattered light is sent on the airborne dust particle in gas circuit, the scattered light signal of the partial angular extents of airborne dust particle passes through spheric reflection
The scattered light signal of mirror and airborne dust particle own partial angular range, after scattered light pressure beam lens pressure beam, collects photoelectricity
On the test surface of detector, remaining optical signal is absorbed by light trapping；
The signal output part of described photodetector is connected with circuit control system.
2. a kind of optical scatter thing concentration detection apparatus according to claim 1 it is characterised in that：Described spheric reflection
Pass through seal with O ring between mirror and optical measurement chamber.
3. a kind of optical scatter thing concentration detection apparatus according to claim 2 it is characterised in that：Described light source shaping
The focal point of lens group obtains the long narrow ellipse light spot of major axis about 4mm short axle about 0.3mm.
4. a kind of optical scatter thing concentration detection apparatus according to claim 1 it is characterised in that：Described circuit controls
Module includes the preposition sampling amplification circuit being sequentially connected electrically, two grades of discharge circuits, threshold comparator, trigger, multichannel meters
Number device, processor, processor is also connected with human-computer interaction module；To photodetector output ultra-weak electronic signal be amplified,
Screen, count, by counting scattered light signal pulse number and obtaining number of particles in the unit interval thus inverting airborne dust grain
The mass concentration of son or Particle density, the particle of different-grain diameter scope is divided different passages to be counted, and has reached online simultaneously
The purpose of the airborne dust particle concentration of measurement different-grain diameter section.
5. a kind of optical scatter thing concentration detection apparatus according to claim 1 it is characterised in that：Described spheric reflection
The reflecting surface of mirror is coated with golden film, improves reflection efficiency.
6. a kind of optical scatter thing concentration detection apparatus according to claim 1 it is characterised in that：Described light trapping is adopted
Use taper mouth structure.
7. a kind of optical scatter thing concentration detection apparatus according to claim 1 it is characterised in that：Described optical measurement
Intracavity portion all carries out blackening process, reduces stray light.
8. a kind of optical scatter thing concentration detection apparatus according to claim 1 it is characterised in that：Described air inlet pipe
Internal diameter can be measured that simple grain subsignal in the range of 2mm～3mm it is ensured that in the range of finite concentration.
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