CN108680476A - A kind of particle concentration detection device - Google Patents
A kind of particle concentration detection device Download PDFInfo
- Publication number
- CN108680476A CN108680476A CN201810632990.9A CN201810632990A CN108680476A CN 108680476 A CN108680476 A CN 108680476A CN 201810632990 A CN201810632990 A CN 201810632990A CN 108680476 A CN108680476 A CN 108680476A
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- Prior art keywords
- shell
- light
- measurement zone
- particle concentration
- detection device
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- 238000001514 detection method Methods 0.000 title claims abstract description 22
- 239000002245 particle Substances 0.000 title claims abstract description 22
- 238000005259 measurement Methods 0.000 claims abstract description 49
- 230000031700 light absorption Effects 0.000 claims abstract description 14
- 230000008676 import Effects 0.000 claims abstract description 6
- 238000012360 testing method Methods 0.000 abstract description 3
- 239000013618 particulate matter Substances 0.000 description 12
- 238000009434 installation Methods 0.000 description 4
- 230000003287 optical effect Effects 0.000 description 4
- 238000000149 argon plasma sintering Methods 0.000 description 3
- 238000013461 design Methods 0.000 description 3
- 239000011324 bead Substances 0.000 description 2
- 239000000428 dust Substances 0.000 description 2
- 238000001727 in vivo Methods 0.000 description 2
- 238000012545 processing Methods 0.000 description 2
- 238000010521 absorption reaction Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000005693 optoelectronics Effects 0.000 description 1
- 238000003672 processing method Methods 0.000 description 1
- 230000011514 reflex Effects 0.000 description 1
- 238000005070 sampling Methods 0.000 description 1
- 229920006395 saturated elastomer Polymers 0.000 description 1
- 239000000779 smoke Substances 0.000 description 1
- 230000007704 transition Effects 0.000 description 1
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N15/00—Investigating characteristics of particles; Investigating permeability, pore-volume, or surface-area of porous materials
- G01N15/06—Investigating concentration of particle suspensions
-
- G01N15/075—
Abstract
The invention discloses a kind of particle concentration detection devices that testing result accuracy is high, including closed shell, shell is equipped with air inlet and air outlet, in shell wind turbine is equipped in air inlet, wind turbine is connected with the lighttight defeated windbend pipe of setting in the housing, in shell measurement zone is equipped in the end of defeated windbend pipe, light source and collimation focusing unit are equipped in shell at corresponding to measurement zone, scattering light collector is equipped in measurement zone, the other end of measurement zone is equipped with lighttight outlet air bend pipe, and outlet air bend pipe is connected with air outlet；It is equipped with reflective mirror in side of the measurement zone far from light source in shell, the light absorption room for absorbing mirror reflection light is equipped in shell, light absorption room includes the babinet that inner wall is covered with black light-absorbing dope layer, and babinet is equipped with light import.
Description
Technical field
The present invention relates to a kind of particle concentration detection devices.
Background technology
Particle concentration detection device based on light scattering principle the application of civilian and industrial circle for a long time, for qualitative or
Particulate matter situation in person's quantitative detection environment, such as part dust sensor, PM2.5 sensors, smoke alarm etc., it is such
The principle of device can be briefly described for:The medium of dust is just detected, particulate matter can scatter light, of different size and form
Grain has different scattering light characteristics.If a large amount of particulate matters are equivalent to the different isotropic bead of many grain sizes, Michaelis
Scattering theory give isotropic uniform dielectric bead scattered optical field under the conditions of parallel light Space Angle distribution with
Relationship between sphere diameter, by the particle scattered light signal of some collected angle, by relevant data processing algorithm, you can
Calculate particle diameter and number, further calculate out the concentration value of particulate matter.
Although particle concentration detection device has had many applications, but still there is many problems.For example, at some
Occasion is thinner to the thickness requirement of detection device, in order to install, saves space；In another example interference problem because design or
The reason of installation, causes extraneous light to enter device internal measurement area and causes interference to measurement；In addition, light scattering measurement
Useful signal be particulate matter scattering optical signal, but scattered light signal is generally relatively weak, when testing light source irradiates measurement zone,
Only fraction light intensity is scattered by particulate matter, and most light intensity can pass through measurement zone to become transmitted light, and transmitted light is irradiated to survey
When measuring the subsequent mechanical structure in area, reflection is will produce, reflected light is turned back to measurement zone, will be interfered measuring to generate, to produce
Raw error, such as transmitted light make the optical device of reception particulate matter scattering light be saturated in advance, cause be high particle concentration illusion；
In addition to this, temperature is also to cause a key factor of measurement error, because the environment temperature of installation site changes, or
Person's light source working overlong time causes optical scattering measuring system temperature to increase, and can all influence the accuracy of measurement result, especially
When temperature change is larger, influence also can bigger.
Invention content
The technical problem to be solved by the present invention is to：A kind of particle concentration that testing result accuracy is high detection dress is provided
It sets.
In order to solve the above technical problems, the technical solution adopted in the present invention is：A kind of particle concentration detection device, packet
Closed shell is included, shell is equipped with air inlet and air outlet, and shell is interior to be equipped with wind turbine in air inlet, and wind turbine is with setting in shell
In lighttight defeated windbend pipe be connected, measurement zone is equipped in the end of defeated windbend pipe in shell, corresponding to survey in shell
It is equipped with light source and collimation focusing unit at amount area, scattering light collector is equipped in measurement zone, the other end of measurement zone is equipped with impermeable
The outlet air bend pipe of light, outlet air bend pipe are connected with air outlet；In shell reflective mirror, shell are equipped in side of the measurement zone far from light source
It is equipped with the light absorption room for absorbing mirror reflection light in vivo, light absorption room includes the case that inner wall is covered with black light-absorbing dope layer
Body, babinet are equipped with light import.
As a preferred solution, the wind turbine is turbofan, and the air intake surface of turbofan and outlet air surface are mutual
Vertically.
As a preferred solution, the outlet air bend pipe caliber gradually increases along air-out direction.
As a preferred solution, the outlet section flare of the outlet air bend pipe.
As a preferred solution, the defeated windbend pipe and outlet air bend pipe are all S-shaped structure.
As a preferred solution, temperature sensor is equipped in the shell.
As a preferred solution, reflective mirror setting is by the measurement zone at 5-8cm.
As a preferred solution, the reflective mirror minute surface and from measurement zone come out transmitted light between angle be less than
40°。
The beneficial effects of the invention are as follows：Due to only having the light intensity that a small amount of light source projects to become scattering light by particulate matter scattering,
A large amount of light intensity, which can penetrate measurement zone, becomes transmitted light, and transmitted light is irradiated to the subsequent mechanical structure of measurement zone, will produce reflection,
Reflected light is turned back to measurement zone, will generate interference to measuring, for example the scattering light collector of reception particulate matter scattering light is made to carry
Preceding saturation, cause be high particle concentration illusion, so shell in side of the measurement zone far from light source be equipped with reflective mirror, shell
It is equipped with the light absorption room for absorbing mirror reflection light in vivo, light absorption room includes the case that inner wall is covered with black light-absorbing dope layer
Body, babinet is equipped with light import, after transmitted light enters light absorption room, by multiple reflection and absorption, the light of " race " out
Become very faint by force, is not enough to generate interference to the scattering measuring system of measurement zone.
Common axial flow blower air intake surface is parallel with outlet air surface, detection device space needed for thickness direction be axial flow blower with
The sum of the installation space of defeated windbend pipe, and turbofan is used in the present apparatus, and the air intake surface of turbofan and outlet air surface are mutual
Vertically so that defeated windbend pipe is directly connected thereto from wind turbine side, to reduce installation space needed for entirety so that particulate matter is dense
Degree detection device can design it is thinner, in order to install, save space.
Due to by lighttight defeated windbend pipe and outlet air bend pipe delivery air, effectively prevent extraneous light by into
Wind cavity enters measurement zone so that measurement result is more accurate.
The outlet air bend pipe caliber gradually increases along air-out direction, increases the cross-sectional area of cavity, reduces air outlet
Wind speed, advantageously reduce noise.
The outlet section flare of the outlet air bend pipe, can further decrease the wind speed of air outlet, advantageously reduce noise.
The defeated windbend pipe and outlet air bend pipe are all S-shaped structure, further ensure that not extraneous light passes through air inlet
Cavity enters measurement zone so that and measurement result is more accurate, while allowing air-flow that can realize stable transition when flowing through bend,
Be conducive to the stability measured.
Be equipped with temperature sensor in the shell, processing amendment can be carried out to detection data according to temperature, reduce because
Error caused by variation of ambient temperature.
Reflective mirror setting places 5-8cm by measurement zone, can make light as much as possible enter light absorption room so as to examine
It is more accurate to survey result.
The reflective mirror minute surface and from measurement zone come out transmitted light between angle be less than 40 °, may make into light absorption
Even if the light of room has very little part to be projected after multiple reflections, will not reflex at measurement zone causes to influence measurement result.
Description of the drawings
Fig. 1 is the main structure diagram of the present invention.
In Fig. 1：Shell 1-0, wind turbine 1-1, air inlet 1-2, defeated windbend pipe 1-3, outlet air bend pipe 1-4, air outlet 1-5 are surveyed
Area 1-6, light source 1-7, collimation focusing unit 1-8 are measured, light collector 1-9, reflection light 1-10, speculum 1-11, light are scattered
Import 1-12, light absorption room 1-13.
Specific implementation mode
Below in conjunction with the accompanying drawings, detailed description of the present invention specific embodiment.
As shown in Figure 1, a kind of particle concentration detection device, including closed shell 1-0, shell 1-0 are equipped with air inlet
Be equipped with turbofan 1-1 in 1-2 and air outlet 1-5, shell 1-0 air inlet 1-2 at, the air intake surface of turbofan 1-1 with go out
Wind face is mutually perpendicular to.
Wind turbine 1-1 is connected with the defeated windbend pipe 1-3 of the lighttight S-shaped being arranged in shell 1-0, defeated in shell 1-0
The end of windbend pipe 1-3 is equipped with tubulose measurement zone 1-6, shell 1-0 and is equipped with light source 1-7 and collimation focusing list at measurement zone 1-6
The other end that scattering light collector 1-9, measurement zone 1-6 are equipped in first 1-8, measurement zone 1-6 is equipped with lighttight S-shaped outlet air bend pipe
1-4, outlet air bend pipe 1-4 are connected with air outlet 1-5；Outlet air bend pipe 1-4 calibers gradually increase along air-out direction, outlet air bend pipe 1-
4 outlet section flare.In shell 1-0 reflective mirror 1-11, reflective mirror 1-11 are equipped in sides of the measurement zone 1-6 far from light source
Setting is by the measurement zone 1-6 at 5cm.The reflective mirror 1-11 minute surfaces and from measurement zone 1-6 come out transmitted light between angle be
30°.The light absorption room 1-13 for absorbing reflective mirror 1-11 reflection lights 1-10 is equipped in shell 1-0, light absorption room 1-13 includes interior
Wall is covered with the babinet of black light-absorbing dope layer, and babinet is equipped with light import 1-12.Temperature sensor is equipped in the shell 1-0
(not shown).
Measurement zone 1-6 is the region of particulate matter light scattering measurement, and sampling air flow passes through measurement zone 1-6, and light source 1-7 is by accurate
Straight focusing unit 1-8, is irradiated to measurement zone 1-6, the particulate matter of measurement zone 1-6 produces scattering, the scattering light of particulate matter to light
It is acquired by scattering light collector 1-9 in some angle, scattered light signal passes through opto-electronic conversion, then is calculated through relevant data processing
Method, you can calculate particle diameter.
The principles and effects of the invention are only illustrated in the above embodiments, and the implementation that part uses
Example, and is not intended to limit the present invention；It should be pointed out that for those of ordinary skill in the art, not departing from wound of the present invention
Under the premise of making design, various modifications and improvements can be made, these are all within the scope of protection of the present invention.
Claims (8)
1. a kind of particle concentration detection device, including closed shell, shell is equipped with air inlet and air outlet, in shell into
Wind turbine is equipped at air port, it is characterised in that：Wind turbine is connected with setting lighttight defeated windbend pipe in the housing, in shell
The end of defeated windbend pipe is equipped with measurement zone, and light source and collimation focusing unit, measurement zone are equipped at corresponding to measurement zone in shell
Interior to be equipped with scattering light collector, the other end of measurement zone is equipped with lighttight outlet air bend pipe, and outlet air bend pipe is connected with air outlet；
It is equipped with reflective mirror in side of the measurement zone far from light source in shell, the light absorption for absorbing mirror reflection light is equipped in shell
Room, light absorption room include the babinet that inner wall is covered with black light-absorbing dope layer, and babinet is equipped with light import.
2. a kind of particle concentration detection device as described in claim 1, it is characterised in that：The wind turbine is turbofan,
And the air intake surface and outlet air surface of turbofan are mutually perpendicular to.
3. a kind of particle concentration detection device as claimed in claim 2, it is characterised in that：The outlet air bend pipe caliber edge goes out
Wind direction gradually increases.
4. a kind of particle concentration detection device as claimed in claim 3, it is characterised in that：The outlet section of the outlet air bend pipe
Flare.
5. a kind of particle concentration detection device as claimed in claim 4, it is characterised in that：The defeated windbend pipe and go out windbend
Guan Douwei S-shaped structures.
6. a kind of particle concentration detection device as described in any one of claim 1-5, it is characterised in that：In the shell
Equipped with temperature sensor.
7. a kind of particle concentration detection device as claimed in claim 6, it is characterised in that：The reflective mirror setting is measuring
By area at 5-8cm.
8. a kind of particle concentration detection device as claimed in claim 7, it is characterised in that：The reflective mirror minute surface with from survey
The angle measured between the transmitted light that area comes out is less than 40 °.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810632990.9A CN108680476A (en) | 2018-06-20 | 2018-06-20 | A kind of particle concentration detection device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810632990.9A CN108680476A (en) | 2018-06-20 | 2018-06-20 | A kind of particle concentration detection device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN108680476A true CN108680476A (en) | 2018-10-19 |
Family
ID=63811503
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201810632990.9A Pending CN108680476A (en) | 2018-06-20 | 2018-06-20 | A kind of particle concentration detection device |
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| Country | Link |
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| CN (1) | CN108680476A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109406358A (en) * | 2018-12-10 | 2019-03-01 | 山西鑫华翔科技发展有限公司 | A kind of reflect adds transmission beam method haze particle stream concentration redundant measurement device |
| CN113820257A (en) * | 2021-09-09 | 2021-12-21 | 麦克微尔(天津)科技有限公司 | Light blocker capable of inhibiting external illumination interference |
| CN116879120A (en) * | 2023-09-06 | 2023-10-13 | 中国华能集团清洁能源技术研究院有限公司 | Smoke detection device |
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