CN106124407A - A kind of optical cavity, the aerosol extinction instrument with this optical cavity and the measuring method of Aerosol Extinction - Google Patents
A kind of optical cavity, the aerosol extinction instrument with this optical cavity and the measuring method of Aerosol Extinction Download PDFInfo
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- G01N21/01—Arrangements or apparatus for facilitating the optical investigation
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- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
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- G01N21/01—Arrangements or apparatus for facilitating the optical investigation
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- G—PHYSICS
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- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
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- G01N21/17—Systems in which incident light is modified in accordance with the properties of the material investigated
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- G—PHYSICS
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Abstract
The invention discloses a kind of optical cavity, including cavity, described cavity is cylindrically, the two ends of described cavity are all sealed and installed with high anti-chamber mirror, the one side of described height anti-chamber mirror is to have the high reverse side of curvature, and described high reverse side all faces intracavity, and the reflectance of described high reverse side is more than 99.95%；The first protection valve, the second protection valve, sample introduction valve and air exhaust nozzle is connected on described cavity; described first protection valve, the two ends of the second protection valve described cavity of separation; described sample introduction valve and air exhaust nozzle are lived apart the two ends of described cavity equally, and described first protection valve, the second protection valve are in relatively closer to the position of described cavity two ends end face.The invention also discloses the enhancing aerosol extinction instrument in chamber, broadband with this optical cavity, and the measuring method that the aerosol extinction utilizing this aerosol extinction instrument to realize is composed simultaneously.Measurement result degree of accuracy of the present invention is high.
Description
Technical field
The present invention relates to Aerosol Extinction Coefficients field of measuring technique, be specifically related to a kind of broadband optical cavity, there is this
The chamber, broadband of optical cavity strengthens aerosol extinction instrument, and utilizes the measurement of Aerosol Extinction that this aerosol extinction instrument realizes
Method.
Background technology
Atmospheric aerosol particle is to climate change, atmospheric environment and human health important.Wherein, aerosol pair
The absorption of solar radiation and scattering directly affect radiation balance of earth thus affect climate change, and this absorption and scattering are referred to as
For delustring.Aerosol extinction also directly affects the visibility of atmospheric environment.But aerocolloidal source, yardstick, concentration and change
Learn the space-time multiformity of component, cause the space and time difference of aerosol optical characteristics, the therefore accurate survey to aerosol optical characteristics
Amount is the key of research Aerosol direct radiative forcing.
The Technology Precision being currently used for Aerosol Extinction mainly has optoacoustic spectroscopy (PAS), cavity-type BPM
Spectral technique (CRDS) and cavity enhanced spectroscopy (CEAS).PAS, through the development of more than 30 years, has developed into a kind of ripe
Instrument widely.CRDS uses the light path that high accuracy optical cavity realizes several kilometers with the base length of one meter, and having, the highest detection is sensitive
While degree and temporal resolution, in addition it is also necessary to accurate detection time declines and swings the high-speed hardware equipment of the factor, relatively costly.CEAS is
Develop on the basis of CRDS, mainly changed by light intensity before and after sample by measurement, it is not necessary to the high cost of hardware of CRDS,
Advantage of lower cost.
Gas phase adsorption is to affect the principal element that Aerosol Extinction is accurately measured, and as at visible light wave range, impact disappears
The predominant gas that backscatter extinction logarithmic ratio is measured is NO2, as absorbed at 532nm, delustring contribution is about 0.33Mm-1At/ppbv, 440nm it is then
About 1.8Mm-1/ ppbv, it can be seen that the impact of gas phase adsorption is very important.The method being commonly used to estimation gas phase adsorption is
First measure the absorptance of background gas (i.e. sample gas after particulate filter) before measurement, determine gas by background correction GAS ABSORPTION
Colloidal sol extinction coefficient.But NO in air2The far and near change of concentration distance emission source is very big, can reach several ppbv to hundreds of
The change of ppbv.
Therefore, Single wavelength is measured technology gas phase adsorption when Aerosol Extinction is measured and can be introduced measurement error, it is impossible to
Draw the gas real-time contribution to delustring, affect the real-time accurate measurements of Aerosol Extinction in atmospheric environment.In this feelings
Accurately to measure Aerosol Extinction Coefficients under condition to be accomplished by the most additional equipment and measure NO specially2Concentration, this makes
Measurement equipment is more complicated.And traditional equipment volume is huge and must possess the LASER Light Source controller of costliness and multiple light
Turning back mirror in road, relatively costly, integration degree is low.
Summary of the invention
It is an object of the invention to provide a kind of optical cavity, the aerosol extinction instrument with this optical cavity and Aerosol Extinction
Measuring method, monitor not accurate enough problem in real time in order to solve Aerosol Extinction in prior art atmospheric environment.
For achieving the above object, the present invention adopts the following technical scheme that.
A kind of optical cavity, including cavity, cylindrically, the two ends of described cavity are all sealed and installed with high anti-chamber to described cavity
Mirror, the one side of described height anti-chamber mirror is to have the high reverse side of curvature, and described high reverse side all faces intracavity, described high reverse side anti-
Rate of penetrating is more than 99.95%；The first protection valve, the second protection valve, sample introduction valve and air exhaust nozzle is connected on described cavity, described
First protection valve, the two ends of the second protection valve described cavity of separation, described sample introduction valve and air exhaust nozzle are lived apart described equally
The two ends of cavity, and described first protection valve, the second protection valve be in relatively closer to the position of described cavity two ends end face
Put.
In the present invention, as the preferred technical scheme of one, the material of described cavity is rustless steel.
In the present invention, as the preferred technical scheme of one, described height anti-chamber mirror is fixed in flange, and described flange is respectively
It is seal-installed on the two ends of described cavity.
Aerosol extinction instrument, including
Light path part, described light path part includes that light source, incident optical, coupled lens, optical filter, optical cavity, self-focusing are saturating
Mirror, outgoing optical fiber and spectrogrph, the light that described light source sends passes through described incident optical, described optical filter, then by described coupling
Closing lens, enter described smooth intracavity, described smooth intracavity emergent light imports described outgoing optical fiber through described GRIN Lens, then accesses
Described spectrogrph, thus completes whole optic path；
Gas path component, described gas path component includes three-way magnetic valve, thermohygrograph, piezometer, sampling pump, mass flowmenter,
Described three-way magnetic valve connects described sample introduction valve, is used for controlling two-way sample gas and enters described sample introduction valve, and wherein a road is connected to
First particle filter, described thermohygrograph, piezometer, sampling pump are sequentially connected, and described thermohygrograph connects with described air exhaust nozzle,
Being provided with the second particle filter between described piezometer and sampling pump, described mass flow is in respect of three, and two of which is respectively
For controlling described first protection valve, the protection throughput of the second protection valve, another is arranged at described second particle mistake
Between filter and described sampling pump；
And data acquisition components, described data acquisition components includes data collecting card and computer, described data acquisition
Card is used for gathering thermohygrograph and manometric data, and is connected with described computer, and described spectrogrph is directly and described computer
It is connected.
In the present invention, as the preferred technical scheme of one, described light source is broadband LED light source.
In the present invention, as the preferred technical scheme of one, described first protection valve, the second protection valve are all passed through guarantor
Protect gas, be used for rinsing protection described height anti-chamber mirror.
In the present invention, as the preferred technical scheme of one, described protection gas is high pure nitrogen or zero air；Described
Mass flowmenter is respectively intended to control the flow of two-way protection gas.
" zero air " refers to desired air, essentially oxygen (about 20%) and nitrogen (about 80%), commonly uses for laboratory,
There is zero special air generation equipment (commercial instrument).
In the present invention, as the preferred technical scheme of one, the two-way sample gas that described three-way magnetic valve controls is in normal work
As time be only capable of selecting one and be passed through.
The measuring method of Aerosol Extinction, utilizes aerosol extinction instrument as above, comprises the steps:
(1) open aerosol extinction instrument, light path part and circuit block all to start, from described first protection valve, the
Two protection valves are all passed through protection gas and protect described height anti-chamber mirror for rinsing, and start sampling pump and start to bleed, utilize computer
Data storing path is set, clicks on running software, select operation wavelength, delustring instrument life's work.
(2) flow of the protection gas being passed through in ensureing the first protection valve, the second protection valve is all 0.1L/min；Arrange
The working time of three-way magnetic valve is respectively background gas 5 minutes and sample gas 30 minutes, and the most every 30 minutes automatic zero adjustments are once；Described
Sampling pump by mass flowmenter control air exhaust nozzle sampling pumping speed be 1.5L/min, and be connected in sample lines thermohygrograph and
Piezometer detects the temperature of sample gas, humidity and pressure values respectively.
(3) data collecting card gathers thermohygrograph and manometric Real-time Monitoring Data, and passes through respectively together with spectrogrph
USB transmission line accesses computer, thus completes whole data acquisition transmission, and knows measurement result according to computer.
In step (2), background gas refers to open the gas circuit 5 minutes being connected to the first particle filter, another Lu Weiguan for 5 minutes
Closed state；Sample gas is then the gas circuit closed and be connected to the first particle filter in 30 minutes, opens another gas circuit 30 minutes simultaneously.
Present invention have the advantage that
(1) apparatus structure uses broadband LED light source, optical fiber and GRIN Lens, eliminate bulky and expensive
LASER Light Source controller and multiple light path are turned back mirror so that instrument is more compact, and integration degree is higher；
(2) the real-time monitoring of Aerosol Extinction in atmospheric environment；
(3) wide spectral measurement, can obtain the aerosol extinction modal data of whole light source wave band；
(4) gas concentration is obtained, the measurement error that effectively in deduction spectrum, gas phase adsorption brings；
(5) degree of accuracy is high, and the measurement error of extinction coefficient is up to 0.1Mm-1；
(6) temporal resolution is high, up to 1s.
Accompanying drawing explanation
Chamber, Fig. 1 broadband strengthens aerosol extinction instrument theory structure schematic diagram.
The principle schematic of Fig. 2 optical cavity.
The measurement of extinction coefficient data of Fig. 3 polystyrene standard bead.
Fig. 4 real atmosphere Aerosol Extinction measurement data.
Detailed description of the invention
Following example are used for illustrating the present invention, but are not limited to the scope of the present invention.
As depicted in figs. 1 and 2, a kind of optical cavity, including cavity, described cavity cylindrically, uses stainless steel, described
The two ends of cavity are all sealed and installed with high anti-chamber mirror, and the one side of described height anti-chamber mirror is to have the high reverse side of curvature, and described height
Reverse side all faces intracavity, and the reflectance of described high reverse side is more than 99.95%；On described cavity connect first protection valve, second
Protection valve, sample introduction valve and air exhaust nozzle, described first protection valve, the two ends of the second protection valve described cavity of separation, the
One protection valve, the second protection valve are all passed through protection gas, are used for rinsing protection described height anti-chamber mirror, and protection gas is high pure nitrogen
Or zero air；Described sample introduction valve and air exhaust nozzle are lived apart the two ends of described cavity equally, and described first protection valve, second
Protection valve is in relatively closer to the position of described cavity two ends end face.
In order to ensure sealing, described height anti-chamber mirror is fixed in flange, and described flange is seal-installed on described chamber respectively
The two ends of body.
The aerosol extinction instrument that the present invention provides, including light path part, gas path component and data acquisition components, described light
Circuit unit includes light source, incident optical, coupled lens, optical filter, optical cavity, GRIN Lens, outgoing optical fiber and spectrogrph, described
Light source is broadband LED light source, and the light that described light source sends passes through described incident optical, described coupled lens, then by described filter
Mating plate, enters described smooth intracavity, and described smooth intracavity emergent light imports described outgoing optical fiber through described GRIN Lens, then accesses institute
State spectrogrph, thus complete whole optic path；Described gas path component includes three-way magnetic valve, thermohygrograph, piezometer, sampling
Pump, mass flowmenter, described three-way magnetic valve connects described sample introduction valve, is used for controlling two-way sample gas and enters described sample introduction gas
Mouth, wherein a road is connected to the first particle filter, and the two-way sample gas that described three-way magnetic valve controls is only capable of selecting when normal work
One is passed through, and i.e. when the gas circuit being connected to the first particle filter is opened, another gas circuit is close, when being connected to the first particulate filter
When the gas circuit of device is closed, another gas circuit could be opened；Described thermohygrograph, piezometer, sampling pump are sequentially connected, and described thermohygrograph
Connect with described air exhaust nozzle, between described piezometer and sampling pump, be provided with the second particle filter, described mass flow in respect of
Three, two of which is respectively used to control described first protection valve, the protection throughput of the second protection valve, and another is arranged
Between described second particle filter and described sampling pump；Described data acquisition components includes data collecting card and computer,
Described data collecting card is used for gathering thermohygrograph and manometric data, and is connected with described computer, and described spectrogrph is direct
It is connected with described computer.
The measuring method of Aerosol Extinction, utilizes aerosol extinction instrument as above, comprises the steps:
(1) open aerosol extinction instrument, light path part and circuit block all to start, from described first protection valve, the
Two protection valves are all passed through protection gas and protect described height anti-chamber mirror for rinsing, and start sampling pump and start to bleed, utilize computer
Data storing path is set, clicks on running software, select operation wavelength, delustring instrument life's work.
(2) flow of the protection gas being passed through in ensureing the first protection valve, the second protection valve is all 0.1L/min；Arrange
The working time of three-way magnetic valve is respectively background gas 5 minutes and sample gas 30 minutes, the most every 30 minutes automatic zero adjustments once, the most just
It is to say: opening the gas circuit 5 minutes being connected to the first particle filter, another road is closed mode；Close and be connected to particle filter
Gas circuit, opens another gas circuit 30 minutes, loop cycle simultaneously；Described sampling pump controls the sampling of air exhaust nozzle by mass flowmenter
Pumping speed is 1.5L/min, and is connected to thermohygrograph in sample lines and piezometer detects the temperature of sample gas, humidity and pressure respectively
Value.
(3) data collecting card gathers thermohygrograph and manometric Real-time Monitoring Data, and passes through respectively together with spectrogrph
USB transmission line accesses computer, thus completes whole data acquisition transmission, and knows measurement result according to computer.
(4) data handling procedure that step (3) is gathered by computer is as follows: utilize the background gas broadband light intensity spectrum number recorded
According to I0(λ) and sample gas broadband light intensity modal data I (λ) calculates the broadband Spectral Extinction of light cavity total:
Result that above formula records is actual is gas phase adsorption αgasWith aerosol extinction αaerosolSum, to accurately measure gas
Colloidal sol extinction coefficient need to carry out nonlinear fitting process to the total extinction coefficient α (λ) recorded:
α (λ)=∑ niσi(si+tiλ)+P(λ)
Extinction coefficient after process mainly include two parts: Part I is the gas phase adsorption of each gas, is expressed as niσi
(si+tiλ), niFor gas concentration, σi(si+tiλ) it is GAS ABSORPTION cross section, siAnd tiIt is respectively translation and the stretching of position of spectral line；
Part II is aerocolloidal extinction coefficient to be measured, is expressed as P (λ), and the most final result of calculation can be by gas phase adsorption and gas
Colloidal sol delustring separates, it is achieved the real-time precision measurment of aerosol extinction spectrum.
It is more detailed application example first below:
Chamber, described broadband strengthens aerosol extinction instrument and includes light path part, gas path component and data acquisition components.Light source 101
Select blue light broadband LED, centre wavelength 461nm.Incident optical 102 is core diameter 600um, the multimode fibre of numerical aperture 0.22.
Coupled lens 103 is bore 25.4mm, the achromat of focal length 75mm.Optical filter 104 selects centre wavelength 450nm, maximum
The broad band pass filter of half-breadth 40nm.The a length of 700mm in optical cavity 105 chamber, cavity 1051 material is rustless steel, is shaped as cylindric, interior
Footpath is 35mm, and the first protection valve 1054, second protects valve 1055, sample introduction valve 1056, air exhaust nozzle 1057 internal diameter to be
4mm, first high anti-chamber mirror the 1052, second high anti-chamber mirror 1053 is the plano-concave high reflective mirror of radius of curvature 1m, bore 25.4mm, and it is anti-
Rate of penetrating is at 440nm-475nm wave band more than 99.96%, and two chamber mirrors are fixed in specific flange, and recycling flange is the closeest
Encapsulation is adjusted at the two ends of cavity 1051, and high reverse side is towards intracavity direction.Outgoing optical fiber 107 is core diameter 500um, numerical aperture 0.22
Multimode fibre.
The light that light source 101 (blue light broadband LED) sends is transmitted by incident optical 102, coupled lens 103 and optical filter
Entering optical cavity 105 after 104, optical cavity 105 emergent light imports outgoing optical fiber 107 through GRIN Lens 106, then accesses spectrogrph 108,
Thus complete whole optic path.
Protection gas is divided into two-way after being passed through gas circuit pipe fitting, respectively at each road cut-in quality effusion meter 201 (with the first protection
Valve 1054 matches) and mass flowmenter 202 (matching with the second protection valve 1055), control the flow of two-way protection gas
It is all 0.1L/min；Protection gas selects high pure nitrogen, is surveying for protection first high anti-chamber mirror the 1052, second high anti-chamber mirror 1053
From Aerosol Pollution during amount.Sample introduction valve is used for being passed through sample gas to be measured, and sample gas end interface has two-way, and a road gas is connected to
One particle filter 205, another road gas does not connects.Tow channel gas accesses sample introduction valve 1056 by three-way magnetic valve 204, the most only permits
Permitted wherein to lead up to, is respectively set to background gas 5 minutes and sample gas 30 minutes, i.e. the working time of three-way magnetic valve 204
Every 30 minutes automatic zero adjustments are once.When the gas circuit being connected to the first particle filter 205 is opened, another road is closed mode, this
Time filter after sample gas can use as background gas；When the gas circuit being connected to the first particle filter 205 is closed, another road is for beat
Open state, now sample gas filtered, then be air to be measured.Sampling pump 209 controls air exhaust nozzle 1057 by mass flowmenter 203
Sampling pumping speed is 1.5L/min, the second filter 206 quality of protection effusion meter 203, and is connected to thermohygrograph 207 in sample lines
Detect the temperature of sample gas, humidity and pressure values respectively with piezometer 208, thus complete the transmission of whole gas circuit.
Data collecting card 301 is used for gathering thermohygrograph 207 and the Real-time Monitoring Data of piezometer 208, and and spectrogrph 108
Access computer 302 by USB transmission line the most respectively, thus complete whole data acquisition transmission.
The computer data handling procedure to gathering is as follows: utilize background gas light intensity I recorded0Calculate with sample gas light intensity I
Broadband Spectral Extinction total in emitting cavity:
Result that above formula records is actual is gas phase adsorption αgasWith aerosol extinction αaerosolSum, to accurately measure gas
Colloidal sol extinction coefficient need to carry out nonlinear fitting process to the total extinction coefficient α (λ) recorded:
α (λ)=∑ niσi(si+tiλ)+P(λ)
Extinction coefficient after process mainly include two parts: Part I is the gas phase adsorption of each gas, is expressed as niσi
(si+tiλ), niFor gas concentration, σi(si+tiλ) it is GAS ABSORPTION cross section, siAnd tiIt is respectively translation and the stretching of position of spectral line；
Part II is aerocolloidal extinction coefficient to be measured, is expressed as P (λ), and the most final result of calculation can be by gas phase adsorption and gas
Colloidal sol delustring separates, it is achieved the real-time precision measurment of aerosol extinction spectrum.
Fig. 3, Fig. 4 are the result that above-mentioned application example obtains.
Fig. 3 show polystyrene standard bead (PSL) extinction coefficient using the present invention to record and closes with Particle number concentration
System's figure.The PSL (200nm, 240nm, 300nm, 350nm, 400nm and 500nm) that have chosen different-grain diameter surveys, and obtains
PSL extinction coefficient and Particle number concentration, and obtained the Extinction Cross of each particle diameter at 461nm by linear fit.
Fig. 4 show the real atmosphere Aerosol Extinction measurement data using the present invention to carry out, and is obtaining at 461nm
While Aerosol Extinction, have also obtained principal absorptive gas NO therein2Real-time concentration.
Although, the present invention is described in detail to have used general explanation and specific embodiment, but at this
On the basis of invention, can be modified it or improve, this will be apparent to those skilled in the art.Therefore,
These modifications or improvements without departing from theon the basis of the spirit of the present invention, belong to the scope of protection of present invention.
Claims (9)
1. an optical cavity, it is characterised in that: including cavity, cylindrically, the two ends of described cavity all seal installation to described cavity
Having high anti-chamber mirror, the one side of described height anti-chamber mirror is to have the high reverse side of curvature, and described high reverse side all faces intracavity, described height
The reflectance of reverse side is more than 99.95%；Connect the first protection valve, the second protection valve, sample introduction valve on described cavity and take out
Valve, described first protection valve, the two ends of the second protection valve described cavity of separation, described sample introduction valve and air exhaust nozzle are same
Live apart the two ends of described cavity, and described first protection valve, the second protection valve are in relatively closer to described cavity two ends
The position of end face.
2. a kind of optical cavity as claimed in claim 1, it is characterised in that: the material of described cavity is rustless steel.
3. a kind of optical cavity as claimed in claim 1, it is characterised in that: described height anti-chamber mirror is fixed in flange, described flange
It is seal-installed on the two ends of described cavity respectively.
4. aerosol extinction instrument, it is characterised in that: include
Light path part, described light path part includes light source, incident optical, coupled lens, optical filter, optical cavity, GRIN Lens, goes out
Penetrating optical fiber and spectrogrph, described optical cavity is the optical cavity as described in any one of claim 1-3, and the light that described light source sends passes through
Described incident optical, described optical filter, then by described coupled lens, enter described smooth intracavity, described smooth intracavity emergent light warp
Described GRIN Lens imports described outgoing optical fiber, then accesses described spectrogrph, thus completes whole optic path；
Gas path component, described gas path component includes three-way magnetic valve, thermohygrograph, piezometer, sampling pump, mass flowmenter, described
Three-way magnetic valve connects described sample introduction valve, is used for controlling two-way sample gas and enters described sample introduction valve, and wherein a road is connected to first
Particle filter, described thermohygrograph, piezometer, sampling pump are sequentially connected, and described thermohygrograph connects with described air exhaust nozzle, described
Being provided with the second particle filter between piezometer and sampling pump, described mass flow is in respect of three, and two of which is respectively used to
Controlling described first protection valve, the protection throughput of the second protection valve, another is arranged at described second particle filter
And between described sampling pump；
And data acquisition components, described data acquisition components includes data collecting card and computer, and described data collecting card is used
In gathering thermohygrograph and manometric data, and being connected with described computer, described spectrogrph is directly connected with described computer.
5. aerosol extinction instrument as claimed in claim 4, it is characterised in that: described light source is broadband LED light source.
6. aerosol extinction instrument as claimed in claim 5, it is characterised in that: described first protection valve, the second protection valve
All it is passed through protection gas, is used for rinsing protection described height anti-chamber mirror.
7. aerosol extinction instrument as claimed in claim 6, it is characterised in that: described protection gas is high pure nitrogen or zero sky
Gas.
8. aerosol extinction instrument as claimed in claim 7, it is characterised in that: the two-way sample gas that described three-way magnetic valve controls exists
It is only capable of selecting one during normal work to be passed through.
9. the measuring method of Aerosol Extinction, utilizes aerosol extinction instrument as claimed in claim 8, including walking as follows
Rapid:
(1) open aerosol extinction instrument, light path part and circuit block all to start, from described first protection valve, the second guarantor
Protect valve and be all passed through protection gas for rinsing protection described height anti-chamber mirror, start sampling pump and start to bleed, utilize computer installation
Data storing path, clicks on running software, selects operation wavelength, delustring instrument life's work；
(2) flow of the protection gas being passed through in ensureing the first protection valve, the second protection valve is all 0.1L/min；Threeway is set
The working time of electromagnetic valve is respectively background gas 5 minutes and sample gas 30 minutes, and the most every 30 minutes automatic zero adjustments are once；Described sampling
The sampling pumping speed that pump controls air exhaust nozzle by mass flowmenter is 1.5L/min, and is connected to thermohygrograph and pressure in sample lines
Score does not detect the temperature of sample gas, humidity and pressure values, and what background gas recorded is I through broadband light intensity modal data0(λ), sample gas
Recording is I (λ) through broadband light intensity modal data；
(3) data collecting card gathers thermohygrograph and manometric Real-time Monitoring Data, and is passed by USB respectively together with spectrogrph
Defeated line accesses computer, thus completes whole data acquisition transmission；
(4) data handling procedure that step (3) is gathered by computer is as follows: utilize the background gas broadband light intensity modal data I recorded0
(λ) and sample gas broadband light intensity modal data I (λ) calculates the broadband Spectral Extinction of light cavity total:
Result that above formula records is actual is gas phase adsorption αgasWith aerosol extinction αaerosolSum, disappears to accurately measure aerosol
Backscatter extinction logarithmic ratio need to carry out nonlinear fitting process to the total extinction coefficient α (λ) recorded:
α (λ)=∑ niσi(si+tiλ)+P(λ)
Extinction coefficient after process mainly include two parts: Part I is the gas phase adsorption of each gas, is expressed as niσi(si+
tiλ), niFor gas concentration, σi(si+tiλ) it is GAS ABSORPTION cross section, siAnd tiIt is respectively translation and the stretching of position of spectral line；The
Two parts are aerocolloidal extinction coefficient to be measured, are expressed as P (λ), and the most final result of calculation can be molten with gas by gas phase adsorption
Glue delustring separates, it is achieved the real-time precision measurment of aerosol extinction spectrum.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610409849.3A CN106124407A (en) | 2016-06-03 | 2016-06-03 | A kind of optical cavity, the aerosol extinction instrument with this optical cavity and the measuring method of Aerosol Extinction |
Applications Claiming Priority (1)
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| CN114839159A (en) * | 2022-04-13 | 2022-08-02 | 中国空气动力研究与发展中心超高速空气动力研究所 | Resonant cavity absorption spectrum measurement method compatible with cavity enhancement technology and cavity ring-down technology |
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