CN102128792B - Device and method for measuring atmospheric absorption coefficient based on phase perturbation - Google Patents
Device and method for measuring atmospheric absorption coefficient based on phase perturbation Download PDFInfo
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- CN102128792B CN102128792B CN2010105866680A CN201010586668A CN102128792B CN 102128792 B CN102128792 B CN 102128792B CN 2010105866680 A CN2010105866680 A CN 2010105866680A CN 201010586668 A CN201010586668 A CN 201010586668A CN 102128792 B CN102128792 B CN 102128792B
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Abstract
The invention discloses a device and method for measuring an atmospheric absorption coefficient based on phase perturbation. The device comprises a mechanical compensation zoom system, a sample storage pipe, an optical fiber interferometer and an extinction tube, wherein the sample storage pipe also comprises a sample inlet and a sample outlet. In the invention, a relation between the phase perturbation and the atmospheric absorption coefficient is established, the effects of dispersion and absorption to the atmosphere are effectively separated, the atmospheric absorption coefficients corresponding to parallel laser beams with different wavelengths can be measured in a non-contact way while the original properties of the atmosphere are maintained, the evolution law of the atmospheric absorption coefficient along with time can be detected, and the method has the characteristics of high detection speed, high sensitivity and simple operation.
Description
Technical field
The present invention relates to a kind of new method of The real time measure Atmospheric Absorption coefficient, it can effectively measure the Atmospheric Absorption coefficient of the corresponding light beam of different wave length, can observe Atmospheric Absorption coefficient rule over time.
Background technology
The existence of atmosphere has directly influenced the propagation of light, causes the decay of light in atmosphere.Atmosphere is made up of two parts of scattering and absorption the decay of light; Scattering changes the space distribution of light; Thereby its effect is to change the complicacy that the radiation that arrives the face of land has increased the emittance space distribution, absorbs and has then reduced the emittance that arrives the face of land on the one hand, and the absorbed radiation energy discharges immediately on the other hand; Atmosphere is heated; Directly causing temperature Change and even change normal atmospheric stratification, influenced the radiation balance of area with the whole world, is one of major reason of Global climate change.Up to the present, still very lack the data of air index imaginary part in the world wide, and the accurate mensuration of refractive index imaginary part depends on the reliable measuring of absorption coefficient.When light laser is transmitted in atmosphere; Atmosphere is heated expansion because of absorbing laser, and density reduces, and causes local indexes of refraction to reduce; Be distributed as the laser beam of Gauss or type Gaussian distribution for initial light intensity; The light areas diffract that refractive index is bigger towards periphery in beam center zone and dispersing produces the wavefront distortion and the beam spread of laser beam, forms the thermal blooming phenomenon.Therefore, the absorption coefficient of light of measuring atmosphere will play an important role to gasoloid radiation climate effect and global climate change study, and the transmission in atmosphere also has great practical significance to research light.
No matter the measuring method of existing Atmospheric Absorption coefficient is based on light transmission and also is based on energy budget, and starting point mostly is around two aspects: one, solve the little problem of absorption coefficient, two, solve the problem that occurs together with scattering that always absorbs.
Solve the method that the little problem of absorption coefficient adopts the enrichment aerosol sample usually.Collect the particle in the larger volume on the filter membrane with speed v through aspiration pump, obtain total absorption through the voltage of measuring transmitted light.During measurement a branch of light is divided into the two-way directional light through spectroscope, one tunnel light as a reference, directly through propagation in atmosphere, another road is the light pipes transmit of r as flashlight through radius.Bleeding with vacuum pump accumulates on the filtering membrane particulate, and filtering membrane is equivalent to a diffuse reflection substrate, and the light pipe plating highly reflecting films of filtering membrane back are to collect forward scattering light, and scattering can be ignored the influence of optical absorption measurement like this.Measure the voltage U of reference path and signal light path sample introduction front and back
10, u
10, U
20, u
20, can obtain the aerocolloidal absorption coefficient of surveying
Solve absorption and always adopt integration method usually with the problem that scattering occurs together." filter membrane reflectometry " that Hagon proposes is exactly like this: be provided with the opaque filter membrane that three areas are A--white filter membrane (blank), the grey sample filter membrane that is enriched with particulate and black filter membrane, measure reflective light intensity I with a light source irradiation and at light source 1 side point respectively with photovalve from three filter membrane surfaces
W, I
SAnd I
BUnder light source intensity one stable condition, I
WAnd I
BValue be certain, and I
SDecide with the particle enriching quantity.Gray surface reflection from the sample part
aerosol absorption coefficient is
Undoubtedly, there is not the consideration of real-time aspect in said method, and the particle to be measured that is in the state of shrinking is different with its state in atmosphere; Some is hygroscopic salt in the particle; It can change with environment temperature and humidity; Also might contain some effumability materials in the particle, in gatherer process, possibly volatilize, even collected particle also some chemical changes or the like can take place each other; Multiplex particles is overlapping in addition, and its effect still is unable to estimate at present.
The thermal effect that particle absorbs can cause the subtle change of air themperature; Temperature variation can be exchanged into acoustical signal and detects and handle; Can measure the absorption coefficient of atmosphere through the contact of light-acoustical signal and particle absorption; This method does not generally need sample to concentrate, and has eliminated the influence that scattered light is measured absorption coefficient, compares the situation near real atmosphere yet; But when measuring absorption coefficient with the optoacoustic method, the atmospheric aerosol particle of different-grain diameter scope, limited the measuring accuracy of this method to the selectivity of sound spectrograph.
In a word; It is significant to the Transmission Research of light in atmosphere to measure the Atmospheric Absorption coefficient; Gasoloid radiation climate effect and global climate change study are also played an important role; But existing measuring method can not satisfy the needs in the application far away, and beyond any doubt, the fast and convenient measuring method of Atmospheric Absorption coefficient is inquired into has become a problem of being badly in need of further investigation.
Summary of the invention
The objective of the invention is to the deficiency to existing Atmospheric Absorption coefficient measurement means, a kind of new method of real-time measurement Atmospheric Absorption coefficient is provided, through simple sampling, this method can effectively be measured the Atmospheric Absorption coefficient under the multiple weather condition.
Technical scheme of the present invention is following:
A kind of device of measuring the Atmospheric Absorption coefficient based on phase perturbation; Include stored one kind of tubes; It is characterized in that: the front and back ends of said stored one kind of tubes is respectively equipped with sample and goes into, exports; The joint of described sample inlet and stored one kind of tubes is provided with filter screen, changes the filter screen of different meshes according to the size of the contained particle of institute's test sample article, and described sample export place is equipped with aspiration pump; The front end of said stored one kind of tubes is provided with light inlet and the mechanical compensation zoom system is installed; Described mechanical compensation zoom system changes the laser beam of wavelength in 400～1000nm into the parallel beam of diameter 30mm; The outside of said light inlet is provided with LASER Light Source, and the rear end of said stored one kind of tubes is provided with light-emitting window and the delustring pipe is installed; Include fibre optic interferometer, said fibre optic interferometer has gage beam and reference arm, and two ports of said gage beam extend in the described stored one kind of tubes and the separated beam diameter that is slightly larger than therebetween.
A kind of method based on phase perturbation measurement Atmospheric Absorption coefficient, it is characterized in that: it specifically may further comprise the steps:
(1), the gage beam port position of proofreading and correct fibre optic interferometer, make it received energy reach maximum value, thereby the strictness that realizes the gage beam port is aimed at;
(2), under the situation of the sample gateway of stored one kind of tubes sealing, the stored one kind of tubes inner atmosphere can be considered free air, is in the Q point through regulating fibre optic interferometer;
(3), the selected known LASER Light Source of energy; Regulate the mechanical compensation zoom system repeatedly; Until obtaining satisfactory best parallel beam; Then beam diameter is constrained to 30mm, and makes the light beam axial line overlap with the axial line of stored one kind of tubes, light beam all gets into the delustring pipe through light hole after passing through stored one kind of tubes;
(4), close LASER Light Source, open the sample gateway, select the filter screen of suitable order number and guarantee that it is clean according to atmosphere to be measured, open the aspiration pump at sample export place; The pumping speed of aspiration pump is 3l/min, is that all atmosphere in the replaceable stored one kind of tubes are ambient atmosphere in 2 minutes;
(5), close aspiration pump, the sealed sample inlet is finely tuned fibre optic interferometer Q point once more to the best;
(6), open LASER Light Source; The Atmospheric Absorption coefficient can rise rapidly in the of short duration time; Select curvature to reduce to the measured value of
point of initial curvature as absorption coefficient; The heat that absorb this moment has begun diffusion, and equivalence is an isobaric process again;
(7), close LASER Light Source, wait for fibre optic interferometer get back to initial value and steadily after, repeats 4 times step 6, total Measuring Time was tested estimated value in 1 minute;
(8) if in above-mentioned measuring process, obviously departing from appears in certain measurement data once, and then duplicate measurements once more is till the rarest 5 measured values are comparatively approaching;
(9), try to achieve the above-mentioned mean value of measuring for 5 times, as the absorption coefficient of atmosphere to be measured;
(10), change the laser beam of other wavelength, according to the above-mentioned steps operation, sum up the rule between the different wave length;
(11), above-mentioned 10 steps constitute the static measurement of Atmospheric Absorption coefficient, open sample inlet, restart aspiration pump and operation always, repeating step 6, institute's measured value forms the spectrogram with Measuring Time, this process is the kinetic measurement of Atmospheric Absorption coefficient.
Described device based on phase perturbation measurement Atmospheric Absorption coefficient, it is characterized in that: the internal diameter of said stored one kind of tubes is 80mm, length is 1000mm; The internal diameter of said sample inlet is 30mm, and its axis is apart from A end face 30mm, said sample export internal diameter be 15mm, its axis is apart from B end face 15mm.
Described device based on phase perturbation measurement Atmospheric Absorption coefficient, it is characterized in that: under non-experiment condition, described sample inlet and sample export all are in closed state.
Described device based on phase perturbation measurement Atmospheric Absorption coefficient is characterized in that: described mechanical compensation zoom system is the just group compensation zoom system, pancreatic system of two mobile constituent elements, comprises compensation group, back fixation group, becomes and doubly organize and a preceding fixation group.
The described device of measuring the Atmospheric Absorption coefficient based on phase perturbation; It is characterized in that: described stored one kind of tubes adopts cast aluminium to process; Keep the coarse of stored one kind of tubes inside surface and do the blackout processing; The sample size of stored one kind of tubes is less than the stored one kind of tubes volume in unit interval, and described stored one kind of tubes can be similar to and be regarded as Buffer Pool, and promptly the mobile influence to existing testing sample in the stored one kind of tubes of new sample introduction article is less.
The described method of measuring the Atmospheric Absorption coefficient based on phase perturbation; It is characterized in that: can Static Detection the Atmospheric Absorption coefficient; Also can detection of dynamic, Static Detection is the average of 5 measurement results in the error range, changes the different wavelength of laser bundle; Investigate the relation between absorption coefficient and the wavelength, detection of dynamic is for investigating Atmospheric Absorption coefficient rule over time.
Theoretical foundation of the present invention is: when laser transmits in atmosphere, atmosphere will cause the air index on the light path to produce indivisible decline because of absorbing laser energy, and this perturbation process can be approximated to be isobaric process.Guaranteeing that incident light is under the prerequisite of directional light, the representative point of getting light path middle part is as datum mark, can instead push away the added value of temperature through the decrease of measuring this refractive index, shown in formula (1):
N is an air index in the formula (1), and the unit of air pressure P is kPa, and the unit of temperature T is K.Can know that by following formula the change of air index is only relevant with temperature factor.Heat that air absorbs can be expressed as the function of temperature rise:
ΔQ＝CmΔT (2)
Δ Q is the heat of absorption of air in the formula (2), and C is the specific heat capacity (1006JKg of air
-1K
-1), m is that (average density of air is 1.29Kgm to the interior air quality of light beam
-3).Air quality is converted into volume of air V, and the Atmospheric Absorption coefficient can be expressed as:
The unit of incident light energy Q is J in the formula (3), and the unit of volume of air V is m
3According to above-mentioned theory, design the measuring method of Atmospheric Absorption coefficient.
The measurement of refractive index variable quantity realizes through fibre optic interferometer.
Fibre optic interferometer changes into output intensity through the amplitude-splittine interference method with the phase differential on two light paths
.Usually claim that the light path of leading under the environment to be measured is a gage beam, the light path that is used for working point control is a reference arm.If gage beam is undisturbed, then the optical path difference between gage beam and the reference arm is stablized constantly, so light wave is after coherence stack on the fiber coupler, and it is stable that its output intensity also keeps.If the phase place on the gage beam is changed by the disturbance of environment, then corresponding change also takes place in the optical path difference between gage beam and the reference arm, finally causes the output intensity of interferometer also to change.The output intensity of fibre optic interferometer is the function of phase differential, promptly
Selecting the variable quantity of output intensity and the variable quantity of phase differential is the interval of linear relationship; Light intensity changes phase change the most responsive; It also is best that data are handled; When
(m is an integer); Just satisfy above-mentioned requirements near the low-angle, claim that usually the residing position of
(m is an integer) is the Q point.D/A through data collecting card exports a given reference voltage V
Ref, direct intercepting average voltage V from the photo-detector then
Dc, again with Δ V=V
Dc-V
RefAfter amplifying according to a certain percentage, be loaded on the piezoelectric ceramics through behind the low-pass filter.The phase change that the adjusting enlargement ratio makes Δ V on phase-modulator, produce just in time offsets with the drift phase place, just can fibre optic interferometer be controlled at the Q point.
On some crystalline material, apply certain pressure, can produce effective electric charge accumulation, this phenomenon is called " piezoelectric effect ".Otherwise after applying certain voltage on these crystal, its shape also can change, and this i.e. " inverse piezoelectric effect ".A lot of monocrystal materials all have piezoelectric properties like the polycrystal piezo-electric ceramic composite material of quartzy and synthetic like barium titanate and zirconia titanate (PZT) etc.Piezoelectric ceramics utilizes " inverse piezoelectric effect " to change length of fiber, thereby reaches the purpose that changes light phase.
After optical fiber was stretched Δ l, wherein the change amount of light phase was:
Wherein λ is an optical maser wavelength, and n is a fiber core refractive index, the number of turns that N optical fiber twines.
Displacement l and coefficient d
33And the voltage Δ V that applies is directly proportional, and has:
Δl＝d
33ΔV (6)
If the power conversion coefficient of photo-detector is β, then the two output voltage V1 of fibre optic interferometer and V2 are respectively:
With
A=β (I in the formula
1+ I
2),
Adopt following algorithm to calibrate and the obtaining of phase place: at first according to the relation between fibre optic interferometer output voltage and the phase differential, collect the output voltage time series, search obtains V again
Max=a+b and V
Min=a-b calculates a=(V
Max+ V
Min)/2 and b=|V
Max-V
Min|/2.To bring that formula
can obtain instantaneous phase poor
and make the air clearance of optical fiber between exporting near the relief volume the Q point
into be l with demarcating good a and b, then can obtain the mean refractive index relief volume Δ n on the space length l:
With following formula substitution formula (3):
The atmosphere volume V=π r to be measured that light beam covers
2L, in this patent, the distance of fibre optic interferometer two measuring arm fiber port is l=0.04m, beam radius r=0.015m, beam length L=1m, therefore, absorption coefficient finally can be expressed as:
Beneficial effect of the present invention:
The present invention has set up the relation between phase perturbation and the Atmospheric Absorption coefficient, carries out DATA REASONING based on phase perturbation, and detection speed is fast, and is highly sensitive, and atmospheric condition remains unchanged in the measuring process, and scattering is effectively separated the effect of atmosphere with absorbing; In addition, Atmospheric Absorption coefficient of the present invention be measured as non-cpntact measurement, measurement data has reflected atmospheric condition really.
Description of drawings
Fig. 1 is a structural representation of the present invention.
The displacement voltage relation curve of Fig. 2 piezoelectric ceramics.
Fig. 3 is just organizing the compensation optical system schematic diagram for the present invention.
Fig. 4 is just organizing compensation optical system zemax optimization figure for the present invention
Fig. 5 is the structural representation of fibre optic interferometer of the present invention, and wherein 1 representes fibre optic interferometer, 2 expression embedding gage beams, 3 expression optical fiber adjustment knobs.
Fig. 6 is a fibre optic interferometer fundamental diagram of the present invention, and wherein 1 representes light source, 2 expression single-mode fibers; 3 expression fiber couplers, 4 expression gage beams, 5 expression reference arms; 6 expression calibration fiber heads, 7 expressions atmosphere to be measured, 8 expression photoelectric commutators; 9 expressions attach the piezoelectric ceramics of optical fiber, 10 expression piezoelectric ceramics control voltage signals.
Fig. 7 makes principle for delustring plumber of the present invention.
Embodiment
Referring to Fig. 1,2,3,4,5,6,7; A kind of device based on phase perturbation measurement Atmospheric Absorption coefficient includes stored one kind of tubes 3, and the front and back ends of stored one kind of tubes 3 is respectively equipped with sample and goes into, exports 2,5; Sample inlet 2 is provided with filter screen with the joint of stored one kind of tubes 3; Change the filter screen of different meshes according to the size of the contained particle of institute's test sample article, with the adverse effect that prevents that extreme weathers such as sandstorm from descending macroparticle that experimental result is brought, sample export 5 places are equipped with aspiration pump; The front end of stored one kind of tubes 3 is provided with light inlet and the mechanical compensation zoom system is installed; The mechanical compensation zoom system changes the laser beam of wavelength in 400～1000nm into the parallel beam of diameter 30mm; The outside of light inlet is provided with LASER Light Source, and the rear end of stored one kind of tubes 3 is provided with light-emitting window and delustring pipe 6 is installed; Fibre optic interferometer 4 is installed outside the middle part of stored one kind of tubes 3, and fibre optic interferometer 4 has gage beam and reference arm, and two ports of gage beam extend in the stored one kind of tubes 3 and the separated beam diameter that is slightly larger than therebetween.
A kind of method based on phase perturbation measurement Atmospheric Absorption coefficient specifically may further comprise the steps:
(1), the fibre optic interferometer program of utilizing oscillograph or writing voluntarily; Optical fiber adjustment knob through adjustment gage beam port; Proofread and correct the gage beam port position of fibre optic interferometer, make it received energy reach maximum value, thereby the strictness that realizes the gage beam port is aimed at;
(2), under the situation of the sample gateway of stored one kind of tubes sealing, the stored one kind of tubes inner atmosphere can be considered free air, through regulating the control signal that piezoelectric ceramics produces, makes fibre optic interferometer be in the Q point;
(3), the selected known LASER Light Source of energy; Regulate the mechanical compensation zoom system repeatedly; Until obtaining satisfactory best parallel beam; Then beam diameter is constrained to 30mm, and makes the light beam axial line overlap with the axial line of stored one kind of tubes, light beam all gets into the delustring pipe through light hole after passing through stored one kind of tubes;
(4), close LASER Light Source, open the sample gateway, select the filter screen of suitable order number and guarantee that it is clean according to atmosphere to be measured, open the aspiration pump at sample export place; The pumping speed of aspiration pump is 3l/min, is that all atmosphere in the replaceable stored one kind of tubes are ambient atmosphere in 2 minutes;
(5), close aspiration pump, the sealed sample inlet, the control signal fine setting fibre optic interferometer strictness that produces through piezoelectric ceramics once more is to the Q point;
(6), open LASER Light Source; The Atmospheric Absorption coefficient can rise rapidly in the of short duration time; Select curvature to reduce to the measured value of
point of initial curvature as absorption coefficient; The heat that absorb this moment has begun diffusion, and equivalence is an isobaric process again;
(7), close LASER Light Source, wait for fibre optic interferometer get back to initial value and steadily after, repeats 4 times step 6, total Measuring Time was tested estimated value in 1 minute;
(8) if in above-mentioned measuring process, obviously departing from appears in certain measurement data once, and then duplicate measurements once more is till the rarest 5 measured values are comparatively approaching;
(9), try to achieve the above-mentioned mean value of measuring for 5 times, as the absorption coefficient of atmosphere to be measured;
(10), change the laser beam of other wavelength, according to the above-mentioned steps operation, sum up the rule between the different wave length;
(11), above-mentioned 10 steps constitute the static measurement of Atmospheric Absorption coefficient, open sample inlet, restart aspiration pump and operation always, repeating step 6, institute's measured value forms the spectrogram with Measuring Time, this process is the kinetic measurement of Atmospheric Absorption coefficient.
The internal diameter of stored one kind of tubes is 80mm, and length is 1000mm; The internal diameter of sample inlet is 30mm, and its axis is apart from A end face 30mm, sample export internal diameter be 15mm, its axis is apart from B end face 15mm.
Under non-experiment condition, sample inlet and sample export all are in closed state.
The mechanical compensation zoom system is the just group compensation zoom system, pancreatic system of two mobile constituent elements, comprises compensation group, back fixation group, becomes doubly group and preceding fixation group.
Stored one kind of tubes adopts cast aluminium to process; Keep the coarse of stored one kind of tubes inside surface and do the blackout processing; The sample size of stored one kind of tubes is less than the stored one kind of tubes volume in unit interval, and stored one kind of tubes can be similar to and be regarded as Buffer Pool, and promptly the mobile influence to existing testing sample in the stored one kind of tubes of new sample introduction article is less.
Can Static Detection to the Atmospheric Absorption coefficient; Also can detection of dynamic, Static Detection is the average of 5 measurement results in the error range, changes the different wavelength of laser bundle; Investigate the relation between absorption coefficient and the wavelength, detection of dynamic is for investigating Atmospheric Absorption coefficient rule over time.
Claims (6)
1. device of measuring the Atmospheric Absorption coefficient based on phase perturbation; Include stored one kind of tubes; It is characterized in that: the front and back ends of said stored one kind of tubes is respectively equipped with sample and goes into, exports; The joint of described sample inlet and stored one kind of tubes is provided with filter screen, changes the filter screen of different meshes according to the size of the contained particle of institute's test sample article, and described sample export place is equipped with aspiration pump; The front end of said stored one kind of tubes is provided with light inlet and the mechanical compensation zoom system is installed; Described mechanical compensation zoom system changes the laser beam of wavelength in 400 ~ 1000nm into the parallel beam of diameter 30mm; The outside of said light inlet is provided with LASER Light Source, and the rear end of said stored one kind of tubes is provided with light-emitting window and the delustring pipe is installed; Include fibre optic interferometer, said fibre optic interferometer has gage beam and reference arm, and two ports of gage beam extend in the said stored one kind of tubes and the separated beam diameter that is slightly larger than therebetween.
2. one kind is adopted the described device of claim 1 to measure the method for Atmospheric Absorption coefficient based on phase perturbation, and it is characterized in that: it specifically may further comprise the steps:
(1), the gage beam port position of proofreading and correct fibre optic interferometer, make it received energy reach maximum value, thereby the strictness that realizes the gage beam port is aimed at;
(2), under the situation of the sample gateway of stored one kind of tubes sealing, the stored one kind of tubes inner atmosphere can be considered free air, is in the Q point through regulating fibre optic interferometer;
(3), the selected known LASER Light Source of energy; Regulate the mechanical compensation zoom system repeatedly; Until obtaining satisfactory best parallel beam; Then beam diameter is constrained to 30mm, and makes the light beam axial line overlap with the axial line of stored one kind of tubes, light beam all gets into the delustring pipe through light hole after passing through stored one kind of tubes;
(4), close LASER Light Source, open the sample gateway, select the filter screen of suitable order number and guarantee that it is clean according to atmosphere to be measured, open the aspiration pump at sample export place; The pumping speed of aspiration pump is 3 l/min, is that all atmosphere in the replaceable stored one kind of tubes are ambient atmosphere in 2 minutes;
(5), close aspiration pump, the sealed sample inlet is finely tuned fibre optic interferometer Q point once more to the best;
(6), open LASER Light Source, the Atmospheric Absorption coefficient can rise rapidly in the of short duration time, selects curvature to reduce to the measured value of the 1/e point of initial curvature as absorption coefficient, the heat that absorb this moment has begun to spread, equivalence is an isobaric process again;
(7), close LASER Light Source, wait for fibre optic interferometer get back to initial value and steadily after, repeats 4 steps (6), total Measuring Time was tested estimated value in 1 minute;
(8) if in above-mentioned measuring process, obviously departing from appears in certain measurement data once, and then duplicate measurements once more is till the rarest 5 measured values are comparatively approaching;
(9), try to achieve the above-mentioned mean value of measuring for 5 times, as the absorption coefficient of atmosphere to be measured;
(10), change the laser beam of other wavelength, according to the above-mentioned steps operation, sum up the rule between the different wave length;
(11), above-mentioned 10 steps constitute the static measurement of Atmospheric Absorption coefficient, open sample inlet, restart aspiration pump and operation always, repeating step (6), institute's measured value forms the spectrogram with Measuring Time, this process is the kinetic measurement of Atmospheric Absorption coefficient.
3. the device based on phase perturbation measurement Atmospheric Absorption coefficient according to claim 1, it is characterized in that: the internal diameter of said stored one kind of tubes is 80mm, length is 1000mm; The internal diameter of said sample inlet is 30mm, and its axis is apart from front end face 30mm, said sample export internal diameter be 15mm, its axis is apart from rear end face 15mm.
4. the device based on phase perturbation measurement Atmospheric Absorption coefficient according to claim 1, it is characterized in that: under non-experiment condition, described sample inlet and sample export all are in closed state.
5. the device of measuring the Atmospheric Absorption coefficient based on phase perturbation according to claim 1; It is characterized in that: described mechanical compensation zoom system is the just group compensation zoom system, pancreatic system of two mobile constituent elements, comprises compensation group, back fixation group, becomes doubly group and preceding fixation group.
6. the device of measuring the Atmospheric Absorption coefficient based on phase perturbation according to claim 1; It is characterized in that: described stored one kind of tubes adopts cast aluminium to process; Keep the coarse of stored one kind of tubes inside surface and do the blackout processing; The sample size of stored one kind of tubes is less than the stored one kind of tubes volume in unit interval, and described stored one kind of tubes can be similar to and be regarded as Buffer Pool, and promptly the mobile influence to existing testing sample in the stored one kind of tubes of new sample introduction article is less.
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| CN102507499B (en) * | 2011-11-17 | 2013-10-16 | 合肥工业大学 | Device for measuring atmospheric aerosol absorption coefficient by using photothermal interference |
| CN103048285B (en) * | 2012-12-25 | 2014-11-26 | 中国科学院安徽光学精密机械研究所 | Novel method for measuring absorption coefficient of atmospheric aerosol with light-heat method |
| CN107064024A (en) * | 2016-12-14 | 2017-08-18 | 山东大学 | It is a kind of to improve the air chamber of accuracy of detection when spectral absorption method measures gas concentration |
| CN107490546A (en) * | 2017-09-05 | 2017-12-19 | 中国科学院合肥物质科学研究院 | Survey the external modulation device and method of aerosol absorption and atmospheric turbulance |
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|---|---|---|---|---|
| US5298755A (en) * | 1993-02-01 | 1994-03-29 | The United States Of America As Represented By The United States Department Of Energy | Optical ionization detector |
| CN101162197A (en) * | 2007-11-26 | 2008-04-16 | 重庆大学 | Optical fiber methane sensing system based on fiber core mismatch |
| CN101576488A (en) * | 2009-06-05 | 2009-11-11 | 西南石油大学 | Optoelectronic hybrid integration sensor device of sulfureted hydrogen gas concentration and test method thereof |
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