CN204832513U - Laser device of biological aerosol of on -line monitoring atmosphere - Google Patents
Laser device of biological aerosol of on -line monitoring atmosphere Download PDFInfo
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- CN204832513U CN204832513U CN201520502027.0U CN201520502027U CN204832513U CN 204832513 U CN204832513 U CN 204832513U CN 201520502027 U CN201520502027 U CN 201520502027U CN 204832513 U CN204832513 U CN 204832513U
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Abstract
The utility model discloses a laser device of biological aerosol of on -line monitoring atmosphere, the device mainly adopt a novel laser radar system, receive subsystem and signal acquisition subsystem including laser emission subsystem, echo signal, the laser emission subsystem is used for launching the high energy impulse laser beam, echo signal receives the subsystem and is used for receiving the back scattering signal and becomes the signal of telecommunication to echo light signal conversion, the signal acquisition subsystem be used for receiving the above -mentioned signal of telecommunication, the utility model provides an on current phase existing laser radar system to survey the wave band narrow and less and the problem of existing laser radar system function singleness, in addition the utility model discloses a laser radar system can realize real -time, quick, reliable, non -contact continuous monitor to the biological aerosol nature of atmosphere.
Description
Technical field
The utility model relates to a kind of laser radar apparatus, is specifically related to a kind of laser aid of on-line monitoring Atmospheric Bioaerosol Research.
Background technology
As the active remote sensing instrument of a kind of advanced person, laser radar can realize carrying out the meticulous detection of continuous print to Atmospheric components and state.The difference of laser radar and microwave radar is, it adopts laser, and as emissive source, the latter adopts microwave.Since nineteen sixty, First laser instrument came out in the world, owing to having unique technology advantage in detection range, spatial and temporal resolution, continuous monitoring etc., laser radar is all widely used in dual-use multiple fields.Laser radar system primarily of Laser emission subsystem, echo signal reception subsystem and data acquisition subsystem etc. three part form.The huge number of laser radar, can divide according to differences such as test platform, operation wavelength, scattering mechanism and the detections of a target.But, no matter any type laser radar, its basic functional principle is all, by the scattering of Atmospheric components institute when the high-power laser beam adopting pulsed laser to launch transmits in an atmosphere, wherein backscatter signal is received by echo signal reception subsystem, and then use detector to convert electric signal to after high precision light splitting, finally utilize data acquisition subsystem gather electric signal and transfer to computer.
The aspects such as bioaerosol (bioaerosols) environmental pollution, Global climate change and public health security have important impact, thus cause the continuous concern of various circles of society and researcher, have become the important subject of domestic and international scientific circles.Bioaerosol mainly refers to the biologic grain be suspended in air, comprises bacterium, fungi, virus, spore, pollen and accessory substance thereof, and size can from tens nanometers to several millimeters, and it is mainly derived from the biospheres such as soil, rivers,lakes and seas and animals and plants.As can be seen here, relative to the source (desert or ocean) of sand and dust and marine aerosol, the source of bioaerosol more diversified (all can from land and ocean), its amount entered every year in air can reach ~ 1000Tg.Research display, bioaerosol average concentration is in an atmosphere about 1.9cm-3, accounts for 30% of Atmospheric particulates Particle density; In addition, its mass concentration account for respectively in rural area and rainforest area fine particle (being less than 1 μm) and corase particles (being greater than 1 μm) total mass concentration ~ 30% and ~ 70%; Activated bacterial accounts for 20% of air total particulate concentration between 0.25 ~ 1 μm, high-altitude (8 ~ 15km) to have scholar to utilize aircraft observation result also to find.
Except having general aerocolloidal characteristic, bioaerosol also has the feature such as infectiousness, sensitization, and it has the quite long lifetime by air dielectric diffusion and transmission, thus causes the acute and chronic disease of wider human body and animals and plants disease.For this reason, recent domestic scholar has carried out many bioaerosol observational studies, and emphasis and the starting point of these researchs are also different, mainly comprise the authenticate technology of bioaerosol, concentration monitor and health effect thereof etc.The monitoring technology of bioaerosol mainly comprises off-line and online two kinds of modes, and wherein offline mode has the features such as low temporal resolution, high cost, analysis timeliness are low, online mode then has fast, in real time, the advantage such as Continuous Observation.Facts have proved, on-line monitoring technique is more suitable for the Changing Pattern of Real-Time Monitoring bioaerosol than conventional offline method.So far, the monitoring means of various bioaerosol has obtained many very valuable achievements in research all, but the detection means that can obtain the spatial-temporal distribution characteristic (especially its vertical distribution) of bioaerosol character in real time, fast still also lacks very much.In addition, there is due to bioaerosol the features such as huge number, abundance, complicated component, make its Detection Techniques have more challenge.
Utility model content
The purpose of this utility model is to provide a kind of laser aid of on-line monitoring Atmospheric Bioaerosol Research.
The purpose of this utility model is realized by such technical scheme:
A kind of laser aid of on-line monitoring Atmospheric Bioaerosol Research, comprise Laser emission subsystem, echo signal reception subsystem and signals collecting subsystem, described Laser emission subsystem is for launching high energy pulse laser beam, described echo signal reception subsystem is for receiving backscatter signal and echo optical signal being converted to electric signal, and described signals collecting subsystem is for receiving above-said current signal.
Further, described Laser emission subsystem comprises high power pulsed laser, frequency multiplier, frequency tripler, laser bundle-enlarging collimation device and three high reflectance zone wide mirrors; Described high power pulsed laser launches fundamental frequency near-infrared band laser; Described frequency multiplier makes fundamental frequency near-infrared band optical maser wavelength become visible light wave range; Described frequency tripler is converted to Ultra-Violet Laser near infrared and visible light wave range laser; Described laser bundle-enlarging collimation device increases spot size of laser beams and reduces laser-beam divergence angle simultaneously; Described three high reflectance zone wide mirrors are for changing laser beam path.
Further, described echo signal reception subsystem comprises astronomical telescope, diaphragm, three dichroscopes, three narrow band pass filters, polarization spectro crystal, six convex lens, two photomultipliers, avalanche-type diode, two grating spectrographs; Described astronomical telescope is for receiving the echo signal intensity of different distance; Described diaphragm, for setting the rational field angle of receiving subsystem, reduces the impact of background signal thus improves signal to noise ratio (S/N ratio); Described three dichroscopes are all for selecting different wavelength band, and namely reflection or transmission are less than the shortwave of a certain specific band, and transmission or reflection are greater than the long wave of this wave band; The band signal of described three narrow band pass filters all for selecting filters out the echoed signal beyond this wave band simultaneously; Described polarization spectro crystal is used for the resultant signal of echo Mie scattering signal to be divided into horizontal polarization and vertical polarization two components; Described six convex lens all for echo optical signal focusing or collimate parallel; Described photomultiplier and avalanche-type diode are all for being converted to electric signal the echo optical signal after light splitting; Described grating spectrograph is for receiving faint all band fluorescence signal and converting electric signal to.
Further, described signals collecting subsystem comprises Licel transient data collection device, trigger source detector and computing machine; Described Licel transient data collection device exports from detector the electric signal of coming for gathering; Described trigger source detector is used for exploring laser light and launches the partial dispersion laser of subsystem thus trigger pip acquisition subsystem, realizes the identification to different distance echoed signal; All signals collecting are computerizedd control and display, and are stored in hard disk.
Further, described Licel transient data collection device adopts analog signaling and photon counting mode two kinds of means to gather great dynamic range echoed signal simultaneously.
Owing to adopting technique scheme, the utility model has following advantage:
The utility model utilizes high-energy UV laser beam to excite the fluorescence signal of bioaerosol in air, then 64 passage grating spectrographs are adopted to receive full wave weak fluorescence spectrum, the problem that solution present stage existing laser radar system detecting band is narrow and few.And detect 355nm wave band polarization scattering signal, 387nm nitrogen Raman signal and 407nm steam Raman signal simultaneously, accurately obtain the important information such as concentration, shape of bioaerosol further, solve the problem of present stage existing laser radar system function singleness.This laser radar system can realize real-time, quick, reliable, the contactless continuous monitoring to Atmospheric Bioaerosol Research character.
Accompanying drawing explanation
In order to make the purpose of this utility model, technical scheme and advantage clearly, below in conjunction with accompanying drawing, the utility model is described in further detail, wherein:
Fig. 1 is light path principle schematic diagram of the present utility model.
Embodiment
In order to make the purpose of this utility model, technical scheme and advantage clearly, below in conjunction with accompanying drawing, the utility model is described in further detail.
As shown in Figure 1, in figure, 1 is lens, and 2 is optical filter, and 3 is generating laser, and 4 is laser bundle-enlarging collimation device, and 5 is spectrometer, and 6 is polarizer.
The laser aid of the on-line monitoring Atmospheric Bioaerosol Research of the present embodiment, comprises three functional subsystems such as Laser emission, echo signal reception and signals collecting.Wherein Laser emission subsystem launches ultraviolet and near-infrared laser bundle simultaneously, laser beam is by after bio-aerosol particles institute scattering in air, use echo signal reception subsystem to receive backscatter signal and process further, through high-performance detector echo optical signal converted to electric signal and be transferred to signals collecting subsystem.Signals collecting subsystem adopts simulation and photon counting two kinds of modes gather and record, store to Mie scattering signal simultaneously; And for feeble signal as Raman and fluorescence signal, adopt photon counting mode to carry out gathering and record, store.
The Laser emission subsystem of the present embodiment, comprises high power pulsed laser, frequency multiplier, frequency tripler, beam-expanding collimation device and three high reflectance zone wide mirrors.High power pulsed laser launches fundamental frequency near-infrared band laser, makes wavelength become visible light wave range through frequency multiplier, and recycling frequency tripler is converted to Ultra-Violet Laser near infrared and visible light wave range laser.Use laser bundle-enlarging collimation device, can not only spot size of laser beams be increased, also can effectively reduce laser-beam divergence angle.Three high reflectance zone wide mirrors, for changing laser beam path, are launched to air from telescope optic axis, reach the object that laser radar system launching and receiving is coaxial.
The echo signal reception subsystem of the present embodiment, comprises astronomical telescope, diaphragm, three dichroscopes, three narrow band pass filters, polarization spectro crystal, six convex lens, two photomultipliers, avalanche-type diode, two grating spectrographs.Astronomical telescope, for receiving the echo signal intensity of different distance.Diaphragm, for setting the rational field angle of receiving subsystem, reduces the impact of background signal thus improves signal to noise ratio (S/N ratio).Three dichroscopes, all for selecting different wavelength band, namely reflect the shortwave that (or transmission) is less than a certain specific band, and transmission (or reflection) are greater than the long wave of this wave band.Three narrow band pass filters, the band signal all for selecting filters out the echoed signal beyond this wave band simultaneously.Polarization spectro crystal, for being divided into horizontal polarization and vertical polarization two components to the resultant signal of echo Mie scattering signal.Six convex lens, all for echo optical signal focusing or collimate parallel.Photomultiplier and avalanche-type diode are all for being converted to electric signal the echo optical signal after light splitting.Grating spectrograph, for receiving faint all band fluorescence signal and converting electric signal to.
The signals collecting subsystem of the present embodiment, comprises Licel transient data collection device, trigger source detector and computing machine.Licel transient data collection device, exports from detector the electric signal of coming for gathering.In order to the weak echo signal of the strong echoed signal and far field that gather near field simultaneously, data acquisition unit adopts analog signaling and photon counting mode two kinds of means to gather great dynamic range echoed signals simultaneously.Very faint Raman signal and fluorescence signal, be used alone photon counting mode and gather.Trigger source detector, launches the partial dispersion laser of subsystem thus trigger pip acquisition subsystem for exploring laser light, realizes the identification to different distance echoed signal.All signals collecting are computerizedd control and display, and are stored in hard disk.
The Laser emission subsystem of the present embodiment launches the high energy pulse laser beam of 355nm ultraviolet and 1064nm near-infrared wavelength simultaneously; There is physical process between bioaerosol in laser beam and air, after being scattered, utilize the astronomical telescope of echo signal reception subsystem to receive echo optical signal.Echo signal reception subsystem carries out the process such as meticulous light splitting, filtration and detection to the back scattering laser signal received, and obtains the 64 passage all band fluorescence spectrum signals that total Mie scattering signal of 355nm wavelength and vertical and horizontal polarization 2 components, the nitrogen Raman scattering signal of 387nm wavelength, the steam Raman scattering signal of 407nm wavelength and spectrum width are about 360nm simultaneously.Echo signal reception subsystem converts obtained Mie scattering echoed signal to electric signal, and by those electric signal transmissions to signals collecting subsystem, adopts simulation and photon counting two kinds of modes to gather simultaneously, be finally delivered to Computer display and storage; Faint Raman signal and fluorescence signal are transferred to signals collecting subsystem by echo signal reception subsystem, adopt 2 32 array photomultipliers that light signal is converted to electric signal, recycling photon counting mode gathers, and is finally delivered to Computer display and storage.
The radar system of the present embodiment utilizes high-energy UV laser beam to excite the fluorescence signal of bioaerosol in air, then 64 passage grating spectrographs are adopted to receive full wave weak fluorescence spectrum, the problem that solution present stage existing laser radar system detecting band is narrow and few.And detect 355nm wave band polarization scattering signal, 387nm nitrogen Raman signal and 407nm steam Raman signal simultaneously, accurately obtain the important information such as concentration, shape of bioaerosol further, solve the problem of present stage existing laser radar system function singleness.This laser radar system can realize real-time, quick, reliable, the contactless continuous monitoring to Atmospheric Bioaerosol Research character.
What finally illustrate is, above embodiment is only in order to illustrate the technical solution of the utility model and unrestricted, although be described in detail the utility model with reference to preferred embodiment, those of ordinary skill in the art is to be understood that, can modify to the technical solution of the utility model or equivalent replacement, and not departing from aim and the scope of technical solutions of the utility model, it all should be encompassed in the middle of right of the present utility model.
Claims (5)
1. the laser aid of an on-line monitoring Atmospheric Bioaerosol Research, it is characterized in that: comprise Laser emission subsystem, echo signal reception subsystem and signals collecting subsystem, described Laser emission subsystem is for launching high energy pulse laser beam, described echo signal reception subsystem is for receiving backscatter signal and echo optical signal being converted to electric signal, and described signals collecting subsystem is for receiving above-said current signal.
2. the laser aid of a kind of on-line monitoring Atmospheric Bioaerosol Research according to claim 1, is characterized in that: described Laser emission subsystem comprises high power pulsed laser, frequency multiplier, frequency tripler, laser bundle-enlarging collimation device and three high reflectance zone wide mirrors; Described high power pulsed laser launches fundamental frequency near-infrared band laser; Described frequency multiplier makes fundamental frequency near-infrared band optical maser wavelength become visible light wave range; Described frequency tripler is converted to Ultra-Violet Laser near infrared and visible light wave range laser; Described laser bundle-enlarging collimation device increases spot size of laser beams and reduces laser-beam divergence angle simultaneously; Described three high reflectance zone wide mirrors are for changing laser beam path.
3. the laser aid of a kind of on-line monitoring Atmospheric Bioaerosol Research according to claim 1, is characterized in that: described echo signal reception subsystem comprises astronomical telescope, diaphragm, three dichroscopes, three narrow band pass filters, polarization spectro crystal, six convex lens, two photomultipliers, avalanche-type diode, two grating spectrographs; Described astronomical telescope is for receiving the echo signal intensity of different distance; Described diaphragm, for setting the rational field angle of receiving subsystem, reduces the impact of background signal thus improves signal to noise ratio (S/N ratio); Described three dichroscopes are all for selecting different wavelength band, and namely reflection or transmission are less than the shortwave of a certain specific band, and transmission or reflection are greater than the long wave of this wave band; The band signal of described three narrow band pass filters all for selecting filters out the echoed signal beyond this wave band simultaneously; Described polarization spectro crystal is used for the resultant signal of echo Mie scattering signal to be divided into horizontal polarization and vertical polarization two components; Described six convex lens all for echo optical signal focusing or collimate parallel; Described photomultiplier and avalanche-type diode are all for being converted to electric signal the echo optical signal after light splitting; Described grating spectrograph is for receiving faint all band fluorescence signal and converting electric signal to.
4. the laser aid of a kind of on-line monitoring Atmospheric Bioaerosol Research according to claim 1, is characterized in that: described signals collecting subsystem comprises Licel transient data collection device, trigger source detector and computing machine; Described Licel transient data collection device exports from detector the electric signal of coming for gathering; Described trigger source detector is used for exploring laser light and launches the partial dispersion laser of subsystem thus trigger pip acquisition subsystem, realizes the identification to different distance echoed signal; All signals collecting are computerizedd control and display, and are stored in hard disk.
5. the laser aid of a kind of on-line monitoring Atmospheric Bioaerosol Research according to claim 4, is characterized in that: described Licel transient data collection device adopts analog signaling and photon counting mode two kinds of means to gather great dynamic range echoed signal simultaneously.
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105319191A (en) * | 2015-07-13 | 2016-02-10 | 兰州大学 | Spectrograph type laser radar system detecting bioaerosol |
| CN106018346A (en) * | 2016-05-09 | 2016-10-12 | 山东省科学院海洋仪器仪表研究所 | Aerosol scattering phase function observing device and method |
| CN106067266A (en) * | 2016-07-18 | 2016-11-02 | 北方民族大学 | A kind of experiment porch of laser radar signal acquisition system |
| CN107132203A (en) * | 2017-05-04 | 2017-09-05 | 北京清环智慧水务科技有限公司 | Gas degree of purity detection method, system and device |
| CN109991624A (en) * | 2019-03-21 | 2019-07-09 | 北京是卓科技有限公司 | A kind of new pattern laser radar and detection method based on axis optical and single-photon detecting survey technology |
| CN111596311A (en) * | 2020-06-02 | 2020-08-28 | 北方民族大学 | Laser radar system for detecting relative concentration of bioaerosol and inversion method |
| CN114965400A (en) * | 2022-05-12 | 2022-08-30 | 兰州大学 | Atmospheric microorganism on-line monitor |
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2015
- 2015-07-13 CN CN201520502027.0U patent/CN204832513U/en active Active
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105319191A (en) * | 2015-07-13 | 2016-02-10 | 兰州大学 | Spectrograph type laser radar system detecting bioaerosol |
| CN106018346A (en) * | 2016-05-09 | 2016-10-12 | 山东省科学院海洋仪器仪表研究所 | Aerosol scattering phase function observing device and method |
| CN106067266A (en) * | 2016-07-18 | 2016-11-02 | 北方民族大学 | A kind of experiment porch of laser radar signal acquisition system |
| CN107132203A (en) * | 2017-05-04 | 2017-09-05 | 北京清环智慧水务科技有限公司 | Gas degree of purity detection method, system and device |
| CN109991624A (en) * | 2019-03-21 | 2019-07-09 | 北京是卓科技有限公司 | A kind of new pattern laser radar and detection method based on axis optical and single-photon detecting survey technology |
| CN109991624B (en) * | 2019-03-21 | 2024-04-05 | 北京是卓科技有限公司 | Novel laser radar and detection method based on coaxial optics and single photon detection technology |
| CN111596311A (en) * | 2020-06-02 | 2020-08-28 | 北方民族大学 | Laser radar system for detecting relative concentration of bioaerosol and inversion method |
| CN114965400A (en) * | 2022-05-12 | 2022-08-30 | 兰州大学 | Atmospheric microorganism on-line monitor |
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