CN207528617U - A kind of Aerosol Extinction Coefficients measuring apparatus based on Research on Cavity Ring Down Spectroscopy - Google Patents
A kind of Aerosol Extinction Coefficients measuring apparatus based on Research on Cavity Ring Down Spectroscopy Download PDFInfo
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- CN207528617U CN207528617U CN201721749992.3U CN201721749992U CN207528617U CN 207528617 U CN207528617 U CN 207528617U CN 201721749992 U CN201721749992 U CN 201721749992U CN 207528617 U CN207528617 U CN 207528617U
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Abstract
The utility model discloses a kind of Aerosol Extinction Coefficients measuring apparatus based on Research on Cavity Ring Down Spectroscopy,Including pulsed laser source,Optical isolator,Lens A,Lens B,Reflective mirror,It declines and swings chamber,Tested gas vent,Tested gas access,Separate cavities,High reflectance hysteroscope,Detector,Oscillograph,Data collector,Data line,Computer,Quarter wave plate,Polarization beam splitter prism and power absorption pond,The Laser emission direction of the pulsed laser source is equipped with optical isolator,The optical isolator includes quarter wave plate,Polarization beam splitter prism and power absorption pond,In the lens group that the side of optical isolator is formed for lens A and lens B,The laser of pulsed laser source transmitting passes through optical isolator,Enter to decline after lens group and reflective mirror and swing chamber,The utility model is the Aerosol Extinction Coefficients measuring apparatus designed based on Research on Cavity Ring Down Spectroscopy,Its sensitivity can reach 0.2 Mm‑1, far above the detection sensitivity of traditional extinction coefficient.
Description
Technical field
It is specifically a kind of to be based on cavity ring-down spectroscopy the utility model is related to a kind of Aerosol Extinction Coefficients measuring apparatus
The Aerosol Extinction Coefficients measuring apparatus of technology.
Background technology
Atmospheric aerosol refers to be suspended in the liquid or solid particle in air, usual particle diameter size（Air force
Learn diameter）Between 0.003-100 μm.Atmospheric aerosol can influence earth atmosphere energy by scattering and absorbing solar radiation
Revenue and expenditure, so as to influence climate change, which is known as the direct radiation effect of aerosol.The direct radiation effect of aerosol takes
Certainly in the optical characteristics of aerosol, the main scattering and absorption for including aerosol to light.And the delustring of aerosol is aerosol dissipates
Penetrate coefficient with absorption characteristic as a result, extinction coefficient is the sum of scattering and absorption coefficient.Aerosol Extinction it is accurate
Measurement is to carry out the prerequisite of weather Radiative Forcing research.Meanwhile China's haze weather is increasing in recent years, to air energy
Degree of opinion has an important influence on, and atmospheric visibility is directly related with extinction coefficient, it is therefore necessary to carry out Aerosol Extinction
Research.
Tradition mainly including the use of the detection of laser radar instrument, utilizes the measuring method of Aerosol Extinction Coefficients
Integrating nephelometer detects, detected using the black carbon instrument based on film process and coal soot absorption spectrophotometer etc..Laser thunder
Although up to there is higher spatial resolution, the method is usually applicable only to certain specific aerosol type, for time ruler
Degree changes bigger error for faster aerosol, and when aerosol concentration is relatively low in air, detection sensitivity is relatively low, this
The outer technology is also bigger by weather and atmospheric effect.Integrate that transmissometer is portable and moderate cost, but in high relative humidity ring
When being measured in border, systematic error is significantly bigger than normal, even if after being corrected using traditional modifying factor, since truncated error is larger, surveying
It is usual or relatively low to measure result.For black carbon instrument, although simple with measuring method, the advantages such as price is low, due to measurement side
Method is influenced by filter membrane type and feature, and the scattering being collected on filter membrane or the aerosol of absorbability can influence each other with filter membrane,
Change the absorbent properties of aerosol, over-evaluating for absorption coefficient can be caused.
Utility model content
The purpose of this utility model is to provide a kind of Aerosol Extinction Coefficients surveys based on Research on Cavity Ring Down Spectroscopy
Equipment is measured, to solve the problems mentioned in the above background technology.
To achieve the above object, the utility model provides following technical solution：
A kind of Aerosol Extinction Coefficients measuring apparatus based on Research on Cavity Ring Down Spectroscopy, including pulsed laser source, light
Isolator is learned, lens A, lens B, reflective mirror, declines and swings chamber, tested gas vent, tested gas access, separate cavities, high reflectance
Hysteroscope, detector, oscillograph, data collector, data line, computer, quarter wave plate, polarization beam splitter prism and power absorption pond,
The Laser emission direction of the pulsed laser source is equipped with optical isolator, and the optical isolator includes quarter wave plate, polarization beam splitting
Prism and power absorption pond, in the lens group that the side of optical isolator is formed for lens A and lens B, pulsed laser source transmitting
Laser enter to decline by changing direction by reflective mirror after optical isolator and lens group and swing chamber, decline swing on chamber exist it is tested
Gas vent and tested gas access, and high reflectance is mounted in separate cavities equipped with separate cavities at the both ends for swinging chamber of declining
Hysteroscope is equipped with detector declining in the side direction for swing chamber, the detector is connect with oscillograph, and detector and oscillograph are equal
It is connect with data collector, the data collector is connect again through data line with computer.
The pulsed laser source directional transmissions wavelength is the pulse laser of 532 nm, and the pulsewidth of laser is less than 10 ns, weight
Complex frequency is less than 1 Hz.
Separation gas input port and separation gas delivery outlet are provided on the separate cavities, when measuring apparatus starts, to every
From the separation gas that intracavitary is passed through flowing fully to play the role of that high reflectance hysteroscope and ambient atmos are isolated.
The high reflectance hysteroscope is plano-concave lens, and the concave surface of two high reflectance hysteroscopes is opposite, and high reflectance hysteroscope
Reflectivity be 99.999%.
The detector is photomultiplier, which is connected simultaneously with oscillograph and data collector.
Compared with prior art, the beneficial effects of the utility model are：
Research on Cavity Ring Down Spectroscopy is a kind of novel spectrum detection technique, the multiple reflections characteristic based on high reflective mirror, compared with
It is achievable up to thousands of rice even equivalent optical path of tens of kms in short distance, it is limited with hypersensitivity and low detection excellent
Point, the measurement for aerosol extinction provide novel measuring apparatus, and the utility model is what is designed based on Research on Cavity Ring Down Spectroscopy
Aerosol Extinction Coefficients measuring apparatus, sensitivity can reach 0.2 Mm-1, far above the detection spirit of traditional extinction coefficient
Sensitivity.
Description of the drawings
Fig. 1 is the structure diagram of the Aerosol Extinction Coefficients measuring apparatus based on Research on Cavity Ring Down Spectroscopy.
Fig. 2 is the structure of optical isolator in the Aerosol Extinction Coefficients measuring apparatus based on Research on Cavity Ring Down Spectroscopy
Schematic diagram.
In figure：Pulsed laser source 1, optical isolator 2, lens A3, lens B4, reflective mirror 5, decline swing chamber 6, tested gas goes out
Mouth 7, tested gas access 8, separate cavities 9, high reflectance hysteroscope 10, detector 11, oscillograph 12, data collector 13, data
Line 14, computer 15, quarter wave plate 21, polarization beam splitter prism 22 and power absorption pond 23.
Specific embodiment
The following is a combination of the drawings in the embodiments of the present utility model, and the technical scheme in the embodiment of the utility model is carried out
It clearly and completely describes, it is clear that the described embodiments are only a part of the embodiments of the utility model rather than whole
Embodiment.Based on the embodiment in the utility model, those of ordinary skill in the art are without making creative work
All other embodiments obtained shall fall within the protection scope of the present invention.
Please refer to Fig.1~2, in the utility model embodiment, a kind of atmospheric aerosol based on Research on Cavity Ring Down Spectroscopy disappears
Backscatter extinction logarithmic ratio measuring apparatus including pulsed laser source 1, optical isolator 2, lens A3, lens B4, reflective mirror 5, declines and swings chamber 6, tested
Gas vent 7, tested gas access 8, separate cavities 9, high reflectance hysteroscope 10, detector 11, oscillograph 12, data collector
13rd, data line 14, computer 15, quarter wave plate 21, polarization beam splitter prism 22 and power absorption pond 23, the pulsed laser source 1
Laser emission direction is equipped with optical isolator 2, and the optical isolator 2 includes quarter wave plate 21, polarization beam splitter prism 22 and power
Absorption cell 23, in the lens group that the side of optical isolator 2 is formed for lens A3 and lens B4, what pulsed laser source 1 emitted swashs
Light changes direction by reflective mirror 5 after optical isolator 2 and lens group and swings chamber 6 into declining, and is tested declining to swing to exist on chamber 6
Gas vent 7 and tested gas access 8, and be mounted in separate cavities 9 high anti-equipped with separate cavities 9 at the both ends for swinging chamber 6 of declining
Rate hysteroscope 10 is penetrated, detector 11 is equipped in the side direction for swing chamber 6 declining, the detector 11 is connect with oscillograph 12, and is visited
It surveys device 11 and oscillograph 12 is connect with data collector 13, the data collector 13 connects again through data line 14 and computer 15
It connects.
The 1 directional transmissions wavelength of pulsed laser source is the pulse laser of 532 nm, and the pulsewidth of laser is less than 10 ns,
Repetition rate is less than 1 Hz.
Be provided with separation gas input port and separation gas delivery outlet on the separate cavities 9, when measuring apparatus starts, to every
From the separation gas of flowing is passed through in chamber 9 fully to play the role of that high reflectance hysteroscope 10 and ambient atmos are isolated.
The high reflectance hysteroscope 10 is plano-concave lens, and the concave surface of two high reflectance hysteroscopes 10 is opposite, and high reflectance
The reflectivity of hysteroscope 10 is 99.999%.
The detector 11 is photomultiplier, which is connected simultaneously with oscillograph 12 and data collector 13
It connects.
The operation principle of the utility model is：
Cavity ring-down spectroscopy（cavity ring-down spectroscopy, CRDS）Technology is to rapidly develop the nearly more than ten years
Length can be achieved in a kind of novel spectrum detection technique to get up, the multiple reflections characteristic based on high reflective mirror in shorter distance
Up to thousands of rice even equivalent optical path of tens of kms, there is hypersensitivity and low detection limit, be aerosol extinction
Measurement provides novel measuring apparatus.This technology has the advantage that compared with traditional measuring technique：
（1）In cavity-type BPM, since the reflectivity of hysteroscope is high（Generally 99.9%-99.9999%）, the attenuation of light intensity is slow,
Can be achieved in shorter distance up to thousands of rice even the equivalent optical path light of tens of kms intracavitary can thousands of rice back and forth, make
The sensitivity of detection and detection limit greatly improve, this is that other measuring methods institute is inaccessiable.
（2）Since CRDS technologies are to measure light in the ring-down time in swinging chamber that declines, which is the ratio of an intensity,
It is not directly dependent upon with the intensity size of incident light, therefore measurement result is not excited the influence of light intensity fluctuation, there is signal-to-noise ratio
The advantages that height, strong antijamming capability.
（3）The device of CRDS technologies is very simple, is very easy to realize.In conclusion CRDS technologies disappear in atmospheric aerosol
Backscatter extinction logarithmic ratio has important research significance and application value in measuring.
Although the utility model is described in detail with reference to the foregoing embodiments, those skilled in the art is come
Say, can still modify to the technical solution recorded in foregoing embodiments or to which part technical characteristic into
Row equivalent replacement, within the spirit and principle of the utility model, any modification, equivalent replacement, improvement and so on should all
It is included within the scope of protection of this utility model.
Claims (5)
1. a kind of Aerosol Extinction Coefficients measuring apparatus based on Research on Cavity Ring Down Spectroscopy, including pulsed laser source (1), light
Isolator (2) is learned, lens A (3), lens B (4), reflective mirror (5), declines and swings chamber (6), tested gas vent (7), tested gas and enter
Mouth (8), separate cavities (9), high reflectance hysteroscope (10), detector (11), oscillograph (12), data collector (13), data line
(14), computer (15), quarter wave plate (21), polarization beam splitter prism (22) and power absorption pond (23), which is characterized in that described
The Laser emission direction of pulsed laser source (1) is equipped with optical isolator (2), and the optical isolator (2) is including quarter wave plate
(21), polarization beam splitter prism (22) and power absorption pond (23) are lens A (3) and lens B in the side of optical isolator (2)
(4) lens group of composition, the laser of pulsed laser source (1) transmitting pass through after optical isolator (2) and lens group by reflective mirror
(5) change direction and swing chamber (6) into declining, there are tested gas vent (7) and tested gas access (8) declining to swing on chamber (6), and
At the both ends for swinging chamber (6) of declining equipped with separate cavities (9), high reflectance hysteroscope (10) is mounted in separate cavities (9), swings chamber declining
(6) a side direction is equipped with detector (11), and the detector (11) connect with oscillograph (12), and detector (11) and shows
Wave device (12) is connect with data collector (13), the data collector (13) and through data line (14) and computer (15) even
It connects.
2. the Aerosol Extinction Coefficients measuring apparatus according to claim 1 based on Research on Cavity Ring Down Spectroscopy, special
Sign is that pulsed laser source (1) the directional transmissions wavelength is the pulse laser of 532 nm, and the pulsewidth of laser is less than 10 ns,
Repetition rate is less than 1 Hz.
3. the Aerosol Extinction Coefficients measuring apparatus according to claim 1 based on Research on Cavity Ring Down Spectroscopy, special
Sign is, separation gas input port and separation gas delivery outlet are provided on the separate cavities (9).
4. the Aerosol Extinction Coefficients measuring apparatus according to claim 1 based on Research on Cavity Ring Down Spectroscopy, described
High reflectance hysteroscope (10) is plano-concave lens, and the concave surface of two high reflectance hysteroscopes (10) is opposite, and high reflectance hysteroscope (10)
Reflectivity be 99.999%.
5. the Aerosol Extinction Coefficients measuring apparatus according to claim 1 based on Research on Cavity Ring Down Spectroscopy, special
Sign is, the detector (11) is photomultiplier, the photomultiplier simultaneously with oscillograph (12) and data collector
(13) it is connected.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201721749992.3U CN207528617U (en) | 2017-12-15 | 2017-12-15 | A kind of Aerosol Extinction Coefficients measuring apparatus based on Research on Cavity Ring Down Spectroscopy |
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| CN201721749992.3U CN207528617U (en) | 2017-12-15 | 2017-12-15 | A kind of Aerosol Extinction Coefficients measuring apparatus based on Research on Cavity Ring Down Spectroscopy |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112098351A (en) * | 2020-09-07 | 2020-12-18 | 中国科学院合肥物质科学研究院 | Photoacoustic spectrometer suitable for aerosol absorption and extinction coefficient synchronous measurement |
-
2017
- 2017-12-15 CN CN201721749992.3U patent/CN207528617U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112098351A (en) * | 2020-09-07 | 2020-12-18 | 中国科学院合肥物质科学研究院 | Photoacoustic spectrometer suitable for aerosol absorption and extinction coefficient synchronous measurement |
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