CN204128928U - A kind of based on CCD backward scattered PM 2.5 concentration monitoring device - Google Patents
A kind of based on CCD backward scattered PM 2.5 concentration monitoring device Download PDFInfo
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- CN204128928U CN204128928U CN201420575210.9U CN201420575210U CN204128928U CN 204128928 U CN204128928 U CN 204128928U CN 201420575210 U CN201420575210 U CN 201420575210U CN 204128928 U CN204128928 U CN 204128928U
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- concentration monitoring
- backward scattered
- telescope
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Abstract
The utility model relates to a kind of based on the backward scattered PM2.5 concentration monitoring device of CCD.The utility model comprises Optical Transmit Unit and optical detecting unit composition.Described Optical Transmit Unit is made up of the quasi-continuous laser of a 532nm wavelength; Described optical detecting unit is made up of telescope objective, CCD and computing machine, and wherein CCD is positioned on telescope objective focal plane, and the signal output part of CCD is connected with computing machine; The direction of beam propagation of described laser instrument is parallel with the telescope optic axis receiving light scattering light, adopts low-light (level) CCD to receive backscatter signal.The utility model has good movability and operability, and cost is lower, the feature of simple structure.The PM2.5 concentration of desired zone can be measured easily by the balance stem on adjustment tripod and balance bob.
Description
Technical field
The utility model belongs to field of photoelectric technology, relates to a kind of based on CCD backward scattered PM 2.5 concentration monitoring device.
Background technology
Recent two decades comes, and the fast development of the industries such as the energy, industry, traffic, makes the pollution problem of Atmospheric particulates become increasingly conspicuous.The particle of different-grain diameter along with human body respiration at different respiratory tract site deposition.The particle that particle diameter is less than 2.5 μm is called as PM 2.5.Wherein about 0.1 μm particle major sedimentary is in lung, maximum to harm.At present, it is one of topmost air pollution source of China that PM 2.5 pollutes, and the monitoring of PM 2.5 and effective improvement are the targets of China environmental protection department and national government, have important practical significance to the healthy living of people.The method of the measurement of PM 2.5 has Quartz Crystal to shake sedimentation balance method,
rays method, filter membrane sampling method etc., the high and complicated operation of these method equipment costs, not easily real-time monitored and lack movability and convenience.
Summary of the invention
In order to overcome above deficiency, the utility model devises a kind of based on CCD backward scattered PM 2.5 concentration monitoring device, for on-line monitoring air PM 2.5 concentration real-time change.
The utility model solves the technical scheme that its technical matters adopts:
The utility model comprises Optical Transmit Unit and optical detecting unit composition.Described Optical Transmit Unit is made up of the quasi-continuous laser of a 532nm wavelength; Described optical detecting unit is made up of telescope objective, CCD and computing machine, and wherein CCD is positioned on telescope objective focal plane, and the signal output part of CCD is connected with computing machine; The direction of beam propagation of described laser instrument is parallel with the telescope optic axis receiving light scattering light, adopts low-light (level) CCD to receive backscatter signal.
Furtherly, described laser emitting fundamental-mode gaussian beam, laser power is 500mw, and wavelength is 532nm, is 1mm at the waist radius of laser instrument port.
Furtherly, described astronomical telescope focal length is 80cm, and bore is 10cm.
Furtherly, described CCD resolution is 768 × 574, and pixel dimension size is 12.7 μm × 9.8 μm.The light sensitivity of CCD is export 200mV voltage under 0.0002 lm illumination, and CCD frame number is that 50 frames are per second.
Furtherly, described telescope is fixed on tripod by The Cloud Terrace, and the bore that the balance stem on adjustment tripod head and balance bob can change astronomical telescope points to.
Furtherly, described astronomical telescope fixes a rectangular parallelepiped substrate along its body tube direction, and this substrate is used for fixing laser instrument and laser power supply.
The beneficial effects of the utility model are: the utility model has good movability and operability, and cost is lower, the feature of simple structure.PM 2.5 concentration of desired zone can be measured easily by the balance stem on adjustment tripod and balance bob, thus this device can carry out real-time monitoring to PM 2.5 concentration of specific region, and the data recorded are reliably sufficient, there is good practicality and application.
Accompanying drawing explanation
Fig. 1 the utility model structural drawing.
Embodiment
Below in conjunction with drawings and Examples, the utility model is further illustrated.
In FIG, the parameter of crucial instrument is as follows: laser instrument 6 outgoing fundamental-mode gaussian beam, and laser power is 500mw, and wavelength is 532nm, is 1mm at the waist radius of laser instrument 6 port; Astronomical telescope 4 focal length receiving light scattering light is 80 cm, and bore is 10cm.On focal plane, CCD 2 resolution is 768 × 574, and pixel dimension size is 12.7 μm × 9.8 μm.The light sensitivity of CCD is export 200mV voltage under 0.0002 lm illumination, and CCD 2 frame number is that 50 frames are per second, namely per secondly can export 50 measurement data.Use tripod 3 to support astronomical telescope 4, the bore that the balance stem on adjustment tripod 3 The Cloud Terrace and balance bob can change astronomical telescope 4 points to.Body tube along astronomical telescope 4 fixes the substrate 5 of an applicable size, and this rectangular parallelepiped substrate 5 is used for fixing laser instrument 6 and laser power supply 7.Take off the eyepiece of astronomical telescope 4, CCD 2 is installed on the eyepiece place of astronomical telescope 4.
Multicard Performance software is installed on computer 1 as picture catching software.Be ready to and computer interface, CCD interface, the data line that laser interface matches, adopt these corresponding data lines respectively by external power supply and computing machine, CCD, laser instrument, power supply adaptor is connected.Open the Multicard Performance software of computing machine.Laser instrument Emission Lasers bundle, the position of adjustment astronomical telescope makes laser upwards directive air, astronomical telescope is finely tuned the position of laser instrument, guarantee the image observing CCD imaging in a computer, thus guarantee that laser instrument and the collimation axis of astronomical telescope keep strict parallel, the then position of fixed laser on primary mirror of astronomical telescope cylinder firmly.
When the wavelength of laser, waist radius, initial power are determined, according to Beer law and telescope image-forming principle, particle back scattering light intensity is only relevant with airborne particulate concentration and both are the relation of linear correlation.Analyze the light scattering signal image that CCD collects, the distribution characteristics of Atmospheric particulates can be obtained, and then realize the Real-Time Monitoring of atmosphere particle concentration.For avoiding the impact of daylight on daytime, experimental period is selected to carry out at night.Switch on power, open the Multicard Performance software of computing machine.Laser emitting wavelength is the Gaussian laser beam of 532nm, and the position of adjustment astronomical telescope makes laser upwards directive air.Multicard Performance software is used to catch picture in real time, picture is preserved, a picture is preserved every one minute, altogether record 60 times, for asking the image intensity value mean value in one hour, the mean value of PM 2.5 concentration in PM 2.5 monitor developed by Thermo Fischer Scient Inc. simultaneously recording this experiment place provide a hour.Repeat above-mentioned steps in the different time periods, observed image continues one month, obtains the image of the CCD imaging under different PM 2.5 concentration.Get 60 pictures that photograph in continuous one hour as one group, extract the gray-scale value matrix of every pictures, 256 gray-scale values are added up, try to achieve each gray-scale value corresponding pixel points number u
0, u
1... u
255; Then each gray-scale value corresponding pixel points number of 60 pictures of this group is averaged, and obtains ū
0, ū
1... ū
255; Each gray-scale value is multiplied by pixel number corresponding to this gray-scale value further, obtains the overall relative brightness L of each gray-scale value
0, L
1... L
255.Brightness gray-scale value being greater than i is added, and obtains total light intensity value that gray-scale value is greater than i:
, gray-scale value i is divided into 5 grades, i=0,20,40,60,80.Obtain the total scattering light intensity S (0) under corresponding PM 2.5 concentration, S (20), S (40), S (60), S (80).Above-mentioned steps is repeated to the picture of other different PM 2.5 concentration, obtains total light intensity value S (i) of lower 5 grades of different PM 2.5 concentration.With the linear model preset, matching is carried out to total light intensity value S (i) under different PM 2.5 concentration and adds up the relation obtaining PM 2.5 concentration and total light intensity value.According to this model, real-time monitored is carried out to any region.
Claims (1)
1., based on CCD backward scattered PM 2.5 concentration monitoring device, it is characterized in that:
Comprise Optical Transmit Unit and optical detecting unit composition;
Described Optical Transmit Unit is made up of the quasi-continuous laser of a 532nm wavelength;
Described optical detecting unit is made up of astronomical telescope object lens, CCD and computing machine, and wherein CCD is positioned on telescope objective focal plane, and the signal output part of CCD is connected with computing machine;
The direction of beam propagation of described laser instrument is parallel with the telescope optic axis receiving light scattering light, adopts low-light (level) CCD to receive backscatter signal.
2. a kind of based on CCD backward scattered PM 2.5 concentration monitoring device according to claim 1, it is characterized in that: described laser emitting fundamental-mode gaussian beam, laser power is 500mw, and wavelength is 532nm, is 1mm at the waist radius of laser instrument port.
3. a kind of based on CCD backward scattered PM 2.5 concentration monitoring device according to claim 1, it is characterized in that: described astronomical telescope focal length is 80cm, bore is 10cm.
4. a kind of based on CCD backward scattered PM 2.5 concentration monitoring device according to claim 1, it is characterized in that: described CCD resolution is 768 × 574, pixel dimension size is 12.7 μm × 9.8 μm; The light sensitivity of CCD is export 200mV voltage under 0.0002 lm illumination, and CCD frame number is that 50 frames are per second.
5. a kind of based on CCD backward scattered PM 2.5 concentration monitoring device according to claim 1, it is characterized in that: described astronomical telescope is fixed on tripod by The Cloud Terrace, the bore that the balance stem on adjustment tripod head and balance bob can change astronomical telescope points to.
6. a kind of based on CCD backward scattered PM 2.5 concentration monitoring device according to claim 1, it is characterized in that: described astronomical telescope fixes a rectangular parallelepiped substrate along its body tube direction, and this substrate is used for fixing laser instrument and laser power supply.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420575210.9U CN204128928U (en) | 2014-09-30 | 2014-09-30 | A kind of based on CCD backward scattered PM 2.5 concentration monitoring device |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420575210.9U CN204128928U (en) | 2014-09-30 | 2014-09-30 | A kind of based on CCD backward scattered PM 2.5 concentration monitoring device |
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|---|---|
| CN204128928U true CN204128928U (en) | 2015-01-28 |
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| CN201420575210.9U Expired - Fee Related CN204128928U (en) | 2014-09-30 | 2014-09-30 | A kind of based on CCD backward scattered PM 2.5 concentration monitoring device |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110553953A (en) * | 2018-05-30 | 2019-12-10 | 南台学校财团法人南台科技大学 | High-precision optical air particle detection device |
-
2014
- 2014-09-30 CN CN201420575210.9U patent/CN204128928U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110553953A (en) * | 2018-05-30 | 2019-12-10 | 南台学校财团法人南台科技大学 | High-precision optical air particle detection device |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20150128 Termination date: 20160930 |