CN108760226A - A kind of method and device of atmospheric sounding Turbulent mixing - Google Patents
A kind of method and device of atmospheric sounding Turbulent mixing Download PDFInfo
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Abstract
The present invention provides a kind of atmospheric sounding Turbulent mixing method and device, including：Laser generator, optical transmitting antenna, optical receiver antenna, test of polarity instrument, data processor；The electromagnetic beam sent out from the laser generator emits after optical transmitting antenna collimator and extender, the electromagnetism collimated light beam launched after atmospheric turbulance by optical receiver antenna by being received, electromagnetism collimated light beam passes through test of polarity instrument, test of polarity instrument obtains test data, and Characteristics of Turbulence Structure constant is calculated according to the data that test of polarity instrument obtains in data processor.The result of the obtained Characteristics of Turbulence Structure constant of the method for the present invention is more accurate, more universality and simple in structure more generally applicable than existing method, and operation measures convenient.
Description
Technical field
The present invention relates to FreeSpace Laser Communications Technique field more particularly to it is a kind of by measure electromagnetic beam degree of polarization come
The method and device of atmospheric sounding Turbulent mixing.
Background technology
Occur so far from laser, laser is in laser space communication, lasercom, laser imaging and laser weapon etc.
Field is quickly grown.People one after another to interspace, star, the laser communication links such as absolutely empty carry out theoretical, simulation, key technology is ground
The experimental studies such as study carefully and demonstrate.Atmospheric turbulance is a kind of random medium heterogeneous, can usually regard as and be reflected comprising various scales
The rapid whirlpool of rate is continuously distributed to be formed by stacking, but when laser wave surface passes through atmospheric turbulance, is interacted with rapid whirlpool, is generated such as
A series of atmospheric turbulence effects such as light wave wavefront distortion, beam drift, beam spread, intensity fluctuation, picture point shake and the bit error rate,
These effects seriously constrain the practical application of laser system in all respects.Therefore, the Atmospheric propagating effects of laser increasingly by
To the attention of people, and Characteristics of Turbulence Structure constant is then to characterize the Atmospheric propagating effects of these laser, and reflect atmospheric turbulance
The major parameter of optical characteristics.Therefore, the measurement method for finding blanket Characteristics of Turbulence Structure constant is logical in space laser
It is just particularly important in the multinomial area research such as letter technology.And the measurement method of existing Characteristics of Turbulence Structure constant is using
Range and use condition can be subject to certain restrictions, and there are problems.
In the prior art, the method for measurement of Atmospheric Turbulence structural constant has very much, is broadly divided into two classes, and one kind is non-optical
Measurement method, such as two point and single point temperature Fluctuation Method；Another kind of is measuring method, as optical flare method, arrival angle fluctuation method,
Optical interference measurement and conventional meteorology parameters estimation algorithm etc..
Non-optical measurement method includes mainly following two：
1. two point temperature fluctuation method measurement of Atmospheric Turbulence structural constant (Cn 2)
With the temperature difference between aerial two fixed point of Wheatstone bridge experimental provision direct detection, when measurement, electric bridge is allowed
Two measuring arm resistance R1And R2The two fixed points are located at, the distance between the two points must be much smaller than atmospheric turbulance
External measurement, general spacing is chosen for 50-100cm.Then bridge output exports the temperature difference of the two points, and by certain
Program processing, the structural constant C in atmospheric turbulance temperature field can be obtainedn 2.Finally, according to Characteristics of Turbulence Structure constant Cn 2With it is big
Gas turbulent flow temperature field structural constant Cn 2Between relationship, calculate Cn 2Size.The disadvantages of this method is that it can only measure electricity
Characteristics of Turbulence Structure constant C at where bridge experimental provisionn 2Value.For the Characteristics of Turbulence Structure constant for obtaining on propagation path
Cn 2Distribution, then must install multiple electric bridges, and need synchronization process data.If there is certain angle in laser propagation direction with ground
Upwards, it is actually impossible to measure the C on propagation path using the methodn 2Value.
2. single point temperature Fluctuation Method measurement of Atmospheric Turbulence structural constant (Cn 2)
The indirect method of measurement of atmospheric turbulance refractive index fluctuation characteristic, principle are obtained by measuring the fluctuating of atmospheric temperature
It assumes that air refraction rises and falls and depends entirely on the fluctuation characteristic of temperature.It is known that there are many intrinsic to lack for this method
It falls into, the metal platinum filament that temperature fluctuation method uses first only has several microns of diameter, is easy to be broken off or be caused by environmental pollution
Difficulty is measured, and it changes silk puzzlement, it is made not measure continuously for a long time；Secondly as platinum filament length is more than in atmospheric turbulance
Scale, so the distinguishable scale of turbulence along platinum filament length direction is more than scale in turbulent flow, thus its limited spatial resolution；
In addition, platinum filament carries out contact heat exchange with air, it inevitably causes air certain disturbance.
Measuring method includes mainly following several：
1. optical flare method
Using transportation law of the light scintillation index of plane wave or spherical wave in atmospheric turbulance, by the sudden strain of a muscle for measuring light wave
Bright index carrys out atmospheric sounding Turbulent mixing.It is specific to develop into dual-caliber optical flare method, dual wavelength light scintigraphy, more bores again
A variety of methods such as optical flare method, but the limited spatial resolution of these measurement methods.Also, their theoretical foundation is root
Approximate, the relational expression between the light scintillation index derived and Characteristics of Turbulence Structure constant according to the Rytov under weak fluctuation condition, because
This, optical flare method is not applicable in strong fluctuation condition.
2. arrival angle fluctuation method
Arrival angle fluctuation and the light intensity flicker that plane wave or spherical wave are measured by experimental synchronous, to obtain atmospheric turbulance
Structural constant, as document (Consortini.A, YiYi Sum, C.Innocenti, Zhiping Li.Opt.Commun, 2003,
The method reported in 216,19-23).However, the method is to be based on plane wave or the spherical wave transportation law in atmospheric turbulance
And derive, it is still close according to the Rytov under weak fluctuation condition to cannot directly utilize laser beam, theoretical foundation
The functional relation that the angle of arrival and light scintillation index seemingly derived change with Characteristics of Turbulence Structure constant, this method are rising by force
It can not be also applicable under the conditions of volt.
3. optical interference measurement
It is finally inversed by Characteristics of Turbulence Structure constant by measuring the phase change of interference pattern.Document (Mei Haiping, Yuan Ke
Pretty young woman, in auspicious, air and environmental optics journal, 2007,2,1-5) it is proposed in this theoretical foundation and utilizes phase carrier technology
Single the air gap optical turbulence measuring system, and significantly improved by optimization system measurement level.But due to its system
Using fibre optical sensor light path, the heat of system is transmitted and against shock coefficient needs continuous optimization, to reach high measurement accuracy,
The method is also in constantly improve.
In conclusion as can work out a kind of simple and accurate measurement method of atmospheric sounding Turbulent mixing,
And realize the experimental provision of the method, where this task exactly of the invention.
Invention content
In the presence of overcoming the shortcomings of the prior art, and propose a kind of based on measuring beam
The method that degree of polarization carrys out atmospheric sounding Turbulent mixing, this method are related with Characteristics of Turbulence Structure constant using degree of polarization
Property, the purpose of Characteristics of Turbulence Structure constant is detected by measuring beam degree of polarization.
Another object of the present invention is to provide a kind of experiment dresses for realizing above-mentioned Characteristics of Turbulence Structure constant detection method
It sets, degree of polarization is measured by the experimental provision, according to the degree of polarization of measurement come atmospheric sounding Turbulent mixing.
A kind of atmospheric sounding Turbulent mixing device, including：
Laser generator, optical transmitting antenna, optical receiver antenna, test of polarity instrument, data processor；
The electromagnetic beam sent out from the laser generator emits after optical transmitting antenna collimator and extender, launches
Electromagnetism collimated light beam after atmospheric turbulance by optical receiver antenna by being received, and electromagnetism collimated light beam is by test of polarity instrument, partially
Degree of shaking tester obtains test data, and atmospheric turbulance knot is calculated according to the data that test of polarity instrument obtains in data processor
Structure constant；
The data that the test of polarity instrument obtains include：Electromagnetic beam degree of polarization P, electromagnetic beam initial polarization degree P0；
Characteristics of Turbulence Structure constant is calculated according to following formula in the data processor：
Cn 2For Characteristics of Turbulence Structure constant, f [P, W (ρ1,ρ2, z)] indicate electromagnetic beam degree of polarization P and cross-spectral density letter
Number W (ρ1,ρ2, z) functional relation, and cross-spectral density function W (ρ1,ρ2, z) and=W (P0,l0,ω0,n,λ,δxx,δyy, z) be
Including initial polarization degree P0, scale l in atmospheric turbulance0, ω with a tight waist0, light beam exponent number n, wavelength X, the relevant length in the directions x and the directions y
Spend δxxAnd δyyAnd the function of transmission range z.
Further, atmospheric sounding Turbulent mixing device as described above, the laser generator are Nd:YAG swashs
Light device, CO2Laser, semiconductor laser, optical fiber laser or He-Ne lasers.
Further, atmospheric sounding Turbulent mixing device as described above, the optical transmitting antenna are Kepler
Telescope or Galilean telescope.
Further, atmospheric sounding Turbulent mixing device as described above, the optical receiver antenna are casey lattice
Human relations telescope or Newtonian telescope or Pascal Greggory telescope or Kepler telescope or Galilean telescope.
Further, atmospheric sounding Turbulent mixing device as described above, the test of polarity instrument are DOP-201
Test of polarity instrument or PAX5700 series polarization measurement instrument or EPTS01 test of polarity instrument.
A kind of atmospheric sounding Turbulent mixing method, includes the following steps：
(1) electromagnetic beam that laser generator is sent out is emitted after optical transmitting antenna collimator and extender, makes to launch
Electromagnetism collimated light beam by being received by optical receiver antenna after atmospheric turbulance；
(2) the electromagnetism collimated light beam that optical receiver antenna receives is passed through into polarization degree tester；
(3) using the numerical value measured by polarization degree tester come the value of atmospheric sounding Turbulent mixing；
The electromagnetic beam is partially coherent vector beam, and degree of polarization and the Characteristics of Turbulence Structure constant of electromagnetic beam meet
Following function expression：
Cn 2For Characteristics of Turbulence Structure constant, f [P, W (ρ1,ρ2, z)] indicate electromagnetic beam degree of polarization P and cross-spectral density letter
Number W (ρ1,ρ2, z) functional relation, and cross-spectral density function W (ρ1,ρ2, z) and=W (P0,l0,ω0,n,λ,δxx,δyy, z) be
Including initial polarization degree P0, scale l in atmospheric turbulance0, ω with a tight waist0, light beam exponent number n, wavelength X, the relevant length in the directions x and the directions y
Spend δxxAnd δyyAnd the function of transmission range z.
The present invention has the characteristics that compared with prior art and advantageous effects：
1, a kind of method based on degree of polarization atmospheric sounding Turbulent mixing proposed by the present invention, experimental measurements
For in calculating process, since the formula of foundation is generalized Huygens-Fresnel principle [Y.Dan and by paraxial form
B.Zhang, Opt.Lett.34,563-565 (2009)] and electromagnetic beam in atmospheric turbulance degree of polarization [Y.Zhao,
Y.Zhang, and Q.Wang, Radioengineering 25,652-657 (2016)], do not use any approximation, therefore with it is existing
Some methods are compared, and the result of obtained Characteristics of Turbulence Structure constant is more accurate.
2, a kind of method based on degree of polarization atmospheric sounding Turbulent mixing proposed by the present invention, experimental measurements
For in calculating process, since the formula of foundation is generalized Huygens-Fresnel principle [Y.Dan and by paraxial form
B.Zhang, Opt.Lett.34,563-565 (2009)] and electromagnetic beam in atmospheric turbulance degree of polarization [Y.Zhao,
Y.Zhang, and Q.Wang, Radioengineering 25,652-657 (2016)], thus degree of polarization formula used is strong
It is also set up under fluctuation condition, therefore under strong fluctuation condition, still detectable Characteristics of Turbulence Structure constant, so proposed by the present invention
Measurement method is more generally applicable than existing method.
3, (patent 201010533777.6 is based on M to former atmospheric sounding Turbulent mixing2The factor and light scintillation index are visited
Survey atmosphere structure coefficient method and device) method be to be based on M2Factor atmospheric sounding Turbulent mixing, method require to swash
Light beam keeps the pencil of light beam in transmission process.However, laser beam can be by turbulent flow fluctuating shadow when being transmitted in turbulent atmosphere
It rings, makes beam Propagation and objectives interation and no longer keep pencil.But light beam shape is not required with the measurement method of degree of polarization
Shape, therefore measurement method proposed by the present invention has more universality.
4, provided by the invention to realize a kind of experimental provision based on degree of polarization atmospheric sounding turbulence constant, optical device
Without particular/special requirement, and it is simple in structure, operation measures convenient.
Description of the drawings
Fig. 1 is atmospheric sounding Turbulent mixing apparatus structure schematic diagram of the present invention；
Specific implementation mode
To make the object, technical solutions and advantages of the present invention clearer, the technical solution below in the present invention carries out clear
Chu is fully described by, it is clear that described embodiments are some of the embodiments of the present invention, instead of all the embodiments.It is based on
Embodiment in the present invention, those of ordinary skill in the art are obtained every other without creative efforts
Embodiment shall fall within the protection scope of the present invention.
The present invention basic thought be：Based on degree of polarization is measured come the method for atmospheric sounding Turbulent mixing, will first swash
The electromagnetic beam that radiant is sent out emits after optical transmitting antenna collimator and extender, and the electromagnetism collimated light beam launched is made to pass through
It is received by optical receiver antenna after atmospheric turbulance；Then pass through test of polarity instrument；Finally detected using the degree of polarization measured
Go out Characteristics of Turbulence Structure constant.
According to generalized Huygens-Fresnel principle and Wigner distribution function method [Y.Dan and B.Zhang,
Opt.Lett.34,563-565 (2009)] and degree of polarization [Y.Zhao, Y.Zhang, and of the electromagnetic beam in atmospheric turbulance
Q.Wang, Radioengineering 25,652-657 (2016)], obtain the function of degree of polarization and Characteristics of Turbulence Structure constant
Relational expression is as follows：
C in formula (1)n 2For Characteristics of Turbulence Structure constant, and cross-spectral density function W (ρ1,ρ2, z) and=W (P0,l0,ω0,n,
λ,δxx,δyy, z) and it is to include initial polarization degree P0, scale l in atmospheric turbulance0, ω with a tight waist0, light beam exponent number n, wavelength X, the directions x and
The coherence length δ in the directions yxxAnd δyyAnd the function of transmission range z.The formula (1) is in weak fluctuation condition and strong fluctuation condition
Under set up.
The degree of polarization that measurement is obtained substitutes into formula (1) and calculates, and can obtain the value of Characteristics of Turbulence Structure constant.
The present invention for the above-mentioned institute's atmospheric sounding Turbulent mixing of realization method, using including laser generator, optics
The experimental provision of the components such as transmitting antenna, optical receiver antenna, test of polarity instrument, data processor composition is completed.This
It is simple in structure to invent the experimental provision, operation measures convenient.
To achieve the purpose of the present invention, the present invention is the technical solution that is constituted using following measures to realize.
Method proposed by the present invention based on degree of polarization atmospheric sounding Turbulent mixing, includes the following steps：
(1) electromagnetic beam that laser generator is sent out is emitted after optical transmitting antenna collimator and extender, makes to launch
Electromagnetism collimated light beam by being received by optical receiver antenna after atmospheric turbulance；
(2) and then by the electromagnetism collimated light beam that optical receiver antenna receives pass through test of polarity instrument；
(3) finally the numerical value measured by test of polarity instrument detects the value of Characteristics of Turbulence Structure constant；
The electromagnetic beam is partially coherent Vector Gaussian Beam, and degree of polarization and Characteristics of Turbulence Structure constant meet with
Minor function relational expression：
In formula (1), Cn 2For Characteristics of Turbulence Structure constant, f [P, W (ρ1,ρ2, z)] indicate electromagnetic beam degree of polarization P and intersection
Spectral density function W (ρ1,ρ2, z) functional relation, and cross-spectral density function W (ρ1,ρ2, z) and=W (P0,l0,ω0,n,λ,
δxx,δyy, z) and it is to include initial polarization degree P0, scale l in atmospheric turbulance0, ω with a tight waist0, light beam exponent number n, wavelength X, the directions x and y
The coherence length δ in directionxxAnd δyyAnd the function of transmission range z.
The present invention provides a kind of experimental provision for realizing the above method, it is proposed, according to the invention, the experimental provision includes laser
Generator, optical transmitting antenna, optical receiver antenna, test of polarity instrument, data processor；The experimental provision is sent out by laser
The electromagnetic beam that raw device is sent out emits after optical transmitting antenna collimator and extender, and the electromagnetism collimated light beam launched is made to pass through greatly
It is received by optical receiver antenna after gas turbulent flow；Then the electromagnetism collimated light beam that optical receiver antenna receives is surveyed by degree of polarization
Try instrument；Finally the numerical value measured by test of polarity instrument detects the value of Characteristics of Turbulence Structure constant.
In above-mentioned technical proposal, the laser generator for sending out electromagnetic beam is Nd:YAG laser or CO2Laser
Device or semiconductor laser or optical fiber laser or He-Ne lasers.
In above-mentioned technical proposal, the optical transmitting antenna is Kepler telescope or Galilean telescope.
In above-mentioned technical proposal, the optical receiver antenna is Cassegrainian telescope or Newtonian telescope or Ge Ligao
Sharp telescope or Kepler telescope or Galilean telescope.
In above-mentioned technical proposal, the test of polarity instrument is that DOP-201 test of polarity instrument or PAX5700 series are inclined
Shake tester or EPTS01 test of polarity instrument.
In above-mentioned technical proposal, the data processor is the computer for being equipped with factorization.
The present invention realizes a kind of experimental provision structure that the method based on degree of polarization atmospheric sounding Turbulent mixing provides
As shown in Figure 1.Include the laser generator 1 of output electromagnetic beam, optical transmitting antenna 2, atmospheric turbulance, optics reception in Fig. 1
Antenna 3, test of polarity instrument 4, data processor 5.By Fig. 1, the electromagnetic beam that the laser generator 1 exports is sent out through optics
It penetrates after antenna 2 collimates and emits, into atmospheric turbulance, atmospheric turbulance makes the degree of polarization of the electromagnetic beam rise and fall, the electromagnetism light
Beam is received after transmitting a distance in atmospheric turbulance by optical receiver antenna 3, into test of polarity instrument 4, the degree of polarization
Tester 4 exports the degree of polarization of the light beam received and is transmitted to data processor 5.Finally, the data processor 5 is by being compiled
After the calculation procedure processing of system, Characteristics of Turbulence Structure constant C is exportedn 2。
Embodiment 1
Laser generator 1 used is optical fiber laser, wavelength 1550nm in the present embodiment；Optical transmitting antenna 2 is
Galilean telescope；Atmospheric turbulance is equally distributed atmospheric turbulance；Optical receiver antenna 3 used is Newtonian telescope；Polarization
Degree tester 4 is DOP-201 test of polarity instrument；Optical transmitting antenna 2 and optical receiver antenna 3 used are at a distance of z=3km.
The present embodiment is realized normal based on degree of polarization atmospheric sounding turbulence structure by experimental provision structure as shown in Figure 1
Several methods.Optical component, light path process description are installed by the experimental provision structure of Fig. 1：The optical fiber laser 1 is defeated
Go out electromagnetic beam, the wherein a length of 1550nm of cardiac wave, initial polarization degree is 0.5, and the electromagnetic beam is collimated through optical transmitting antenna 2
And after amplifying, become the collimating electromagnetic light beam that waist width is 10mm, the subsequent collimating electromagnetic light beam transmits in atmospheric turbulance
It is received by optical receiver antenna 3 after distance 3km, enters back into test of polarity instrument 4, the test of polarity instrument 4 output receives
The polarization angle value of light beam is transmitted to data processor 5 again.Finally, the data processor 5 is by the computer programs process worked out
Afterwards, you can output Characteristics of Turbulence Structure constant Cn 2。
The data processor 5 is the computer for the computer program that installation is worked out, and the computer program uses
MATLAB7.0 writes.The calculation procedure can be the M files directly formed with order line or GUIDE modes and order line
The basic step of the gui program that M file modes create, the calculation procedure processing data is as follows：
1) it is the parameter assignment of calculation procedure：Electromagnetic beam wavelength, initial polarization degree, waist width, coherence length and biography
Defeated distance, and input polarization degree measured value；
2) judge whether point of observation position is off-axis, if not then executing meter of the point of observation position in reference axis
Calculate program A)；Otherwise the calculation procedure B in the case of execution point of observation position is off-axis)；
A) calculation procedure of the point of observation position in reference axis：
A1 f [P, W (ρ) are calculated using formula (1)1,ρ2, z)] value (r=0)；This equation of Numerical Methods Solve is used in combination,
Obtain Characteristics of Turbulence Structure constant Cn 2。
B the calculation procedure in the case of) point of observation position is off-axis：
B1 the off-axis position vector (r ≠ 0) of point of observation) is calculated；
B2 f [P, W (ρ) are calculated using formula (1)1,ρ2, z)] value；This equation of Numerical Methods Solve is used in combination, obtains air
Turbulent mixing Cn 2。
It is 0.8391 that the present embodiment, which measures and receives the off-axis degree of polarization of light beam, by above-described embodiment, exports atmospheric turbulance
Structural constant Cn 2It is 9.873 × 10-14m-2/3；It is 0.8460 to receive degree of polarization of the light beam point of observation on axis, passes through above-mentioned implementation
Example, output Characteristics of Turbulence Structure constant Cn 2It is 0.325 × 10-14m-2/3, to realize through degree of polarization atmospheric sounding turbulent flow knot
Structure constant.
Embodiment 2
Laser generator 1 used in embodiment 1 is replaced with into Nd in the present embodiment:YAG laser, wherein cardiac wave are a length of
1064nm；Optical transmitting antenna 2 replaces with Kepler telescope；Atmospheric turbulance is still equally distributed atmospheric turbulance；Optics connects
It receives antenna 3 and replaces with Cassegrain telescope, polarization state measuring instrument 4 replaces with EPTS01 test of polarity instrument, data processor 5
It is still identical as data processor described in embodiment 1；Then each optical component is installed by the experimental provision structure of Fig. 1,
His operation experiments step and calculating process are same as Example 1, again may be by measuring obtained degree of polarization and detect air
Turbulent mixing Cn 2。
Finally it should be noted that：The above embodiments are merely illustrative of the technical solutions of the present invention, rather than its limitations；Although
Present invention has been described in detail with reference to the aforementioned embodiments, it will be understood by those of ordinary skill in the art that：It still may be used
With technical scheme described in the above embodiments is modified or equivalent replacement of some of the technical features；
And these modifications or replacements, various embodiments of the present invention technical solution that it does not separate the essence of the corresponding technical solution spirit and
Range.
Claims (6)
1. a kind of atmospheric sounding Turbulent mixing device, which is characterized in that including：
Laser generator (1), optical transmitting antenna (2), optical receiver antenna (3), test of polarity instrument (4), data processor
(5)；
The electromagnetic beam sent out from the laser generator (1) emits after optical transmitting antenna (2) collimator and extender, launches
Electromagnetism collimated light beam by being received by optical receiver antenna (3) after atmospheric turbulance, electromagnetism collimated light beam passes through test of polarity
Instrument (4), test of polarity instrument (4) obtain test data, and data processor (5) is calculated according to the data that test of polarity instrument obtains
Obtain Characteristics of Turbulence Structure constant；
The data that the test of polarity instrument (4) obtains include：Electromagnetic beam degree of polarization P, electromagnetic beam initial polarization degree P0；
Characteristics of Turbulence Structure constant is calculated according to following formula in the data processor (5)：
Cn 2For Characteristics of Turbulence Structure constant, f [P, W (ρ1,ρ2, z)] indicate electromagnetic beam degree of polarization P and cross-spectral density function W
(ρ1,ρ2, z) functional relation, and cross-spectral density function W (ρ1,ρ2, z) and=W (P0,l0,ω0,n,λ,δxx,δyy, z) and it is packet
The P of degree containing initial polarization0, scale l in atmospheric turbulance0, ω with a tight waist0, light beam exponent number n, wavelength X, the coherence length in the directions x and the directions y
δxxAnd δyyAnd the function of transmission range z.
2. atmospheric sounding Turbulent mixing device according to claim 1, which is characterized in that the laser generator
(1) it is Nd:YAG laser, CO2Laser, semiconductor laser, optical fiber laser or He-Ne lasers.
3. atmospheric sounding Turbulent mixing device according to claim 1, which is characterized in that the optical transmitting antenna
(2) it is Kepler telescope or Galilean telescope.
4. atmospheric sounding Turbulent mixing device according to claim 1, which is characterized in that the optical receiver antenna
(3) it is Cassegrainian telescope or Newtonian telescope or Pascal Greggory telescope or Kepler telescope or Galilean telescope
Mirror.
5. atmospheric sounding Turbulent mixing device according to claim 1, which is characterized in that the test of polarity instrument
(4) it is DOP-201 test of polarity instrument or PAX5700 series polarization measurement instrument or EPTS01 test of polarity instrument.
6. a kind of atmospheric sounding Turbulent mixing method, which is characterized in that include the following steps：
(1) electromagnetic beam that laser generator is sent out is emitted after optical transmitting antenna collimator and extender, makes the electricity launched
Magnetic collimated light beam after atmospheric turbulance by optical receiver antenna by being received；
(2) the electromagnetism collimated light beam that optical receiver antenna receives is passed through into polarization degree tester；
(3) using the numerical value measured by polarization degree tester come the value of atmospheric sounding Turbulent mixing；
The electromagnetic beam is partially coherent vector beam, and the degree of polarization and Characteristics of Turbulence Structure constant satisfaction of electromagnetic beam are following
Function expression：
Cn 2For Characteristics of Turbulence Structure constant, f [P, W (ρ1,ρ2, z)] indicate electromagnetic beam degree of polarization P and cross-spectral density function W
(ρ1,ρ2, z) functional relation, and cross-spectral density function W (ρ1,ρ2, z) and=W (P0,l0,ω0,n,λ,δxx,δyy, z) and it is packet
The P of degree containing initial polarization0, scale l in atmospheric turbulance0, ω with a tight waist0, light beam exponent number n, wavelength X, the coherence length in the directions x and the directions y
δxxAnd δyyAnd the function of transmission range z.
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| CN113839713A (en) * | 2021-08-19 | 2021-12-24 | 西安工业大学 | Method for detecting performance of heterodyne detection system by utilizing signal light polarization degree |
| CN113945353A (en) * | 2020-07-17 | 2022-01-18 | 军事科学院系统工程研究院网络信息研究所 | Aerodynamic test method based on luminescent material |
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