CN102739314A - Test system and method for scintillation characteristic of fake partially coherent light transmitted in atmosphere turbulence - Google Patents
Test system and method for scintillation characteristic of fake partially coherent light transmitted in atmosphere turbulence Download PDFInfo
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- CN102739314A CN102739314A CN2012102326675A CN201210232667A CN102739314A CN 102739314 A CN102739314 A CN 102739314A CN 2012102326675 A CN2012102326675 A CN 2012102326675A CN 201210232667 A CN201210232667 A CN 201210232667A CN 102739314 A CN102739314 A CN 102739314A
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Abstract
The invention discloses a test system and method for scintillation characteristic of fake partially coherent light transmitted in atmosphere turbulence, and belongs to the technical field of laser signal transmission and detection in an atmospheric channel. The test system comprises a light beam emission sub system and a light beam receiving and detecting sub system, wherein different variances are used to count and calculate parameters, so that a scintillation variance of the fake partially coherent light transmitted in the atmosphere turbulence under different detector integral time conditions is calculated. The system and the method provided by the invention can synchronously measure the scintillation variance of coherent lasers transmitted in the atmosphere turbulence, and a correspondence between the measured scintillation variance and an actual structural constant value of atmospheric. The result tested by the system and the method disclosed by the invention is helpful for optimizing the design of the application system using the fake partially coherent light to restrain the scintillation caused by the atmosphere turbulence.
Description
Technical field
The invention belongs to laser signal transmission and field of detecting in the atmospheric channel, relate to a kind of pseudo-partially coherent light beam atmospheric turbulance transmission blinking characteristic test macro and method.
Background technology
Atmospheric turbulance causes the light intensity of laser signal to glimmer, and causes the performance of atmospheric channel laser communication system to reduce.Existing result of study shows that the initial space degree of coherence that reduces laser can suppress the light intensity flicker that atmospheric turbulance causes effectively, improves the performance of atmospheric channel laser communication system.In order to control the initial space degree of coherence of laser; In practical application; Usually use random phase screen that the Wave-front phase of laser is modulated, the laser beam after the random phase screen modulation is called pseudo-partially coherent light beam (the SPIE proceeding of seeing 2004 the 5550th is rolled up the 218th～224 page) by DavidVoelz and Kevin Fitzhenry.In fact pseudo-partially coherent light beam is not partially coherent light beam truly, and it remains relevant on transient state.Suppress effect in order to obtain the light intensity flicker; Requirement is within the time of integration of photodetector; With the Wave-front phase of a plurality of different random phase screen modulated lasers, the light intensity flicker variance that the photodetector actual detection goes out depend on photodetector the time of integration length with the ratio at the transformation period interval of random phase screen.In description of the invention, the length time of integration of photodetector is called the relative modulating frequency of pseudo-partially coherent light beam with the ratio at the transformation period interval of random phase screen.In theory, the relative modulating frequency of pseudo-partially coherent light beam is high more, and the light intensity flicker variance that the photodetector actual detection goes out is more little, but the two is not to be simple linear relationship.Current, be used to realize that the device of random phase screen function has: rotation diffuser and LCD space light modulator.Because LCD space light modulator is convenient to control, it is used widely in reality.The cost of LCD space light modulator is directly proportional with the maximum operation frequency of its support (being the largest random phase place screen number that the LCD space light modulator per second can show).The minimum change time interval of random phase screen is directly depended on the maximum operation frequency that LCD space light modulator is supported.For the atmospheric channel laser communication was used, generally more than some Mbps, each shared time span of code element of communicating by letter was very short for traffic rate, if use pseudo-partially coherent light beam to suppress the light intensity flicker, the time of integration of photodetector is also very short.In order to guarantee the relative modulating frequency of certain pseudo-partially coherent light beam, require LCD space light modulator can support bigger operating frequency.If can know the dependence of the relative modulating frequency of pseudo-partially coherent light beam and the light intensity flicker variance that the photodetector actual detection goes out; Just can be according to the design objective requirement of system; Relative modulating frequency to pseudo-partially coherent light beam is optimized design, thereby reduces the cost of LCD space light modulator.In addition, for the ease of comparing analysis, also need the light intensity flicker variance of synchro measure coherent laser atmospheric turbulance transmission with the transmission of coherent laser atmospheric turbulance.Because the time-varying characteristics of real atmosphere turbulent flow need to guarantee that coherent laser is identical with the atmospheric turbulance transient response of the transmission channel of pseudo-partially coherent light beam.The present invention makes coherent laser on identical space channel, transmit simultaneously with pseudo-partially coherent light beam through the transmitting-receiving light path is carried out suitable design, solves this problem with this.
Summary of the invention
The purpose of this invention is to provide a kind of pseudo-partially coherent light beam atmospheric turbulance transmission blinking characteristic test macro and method.Pseudo-partially coherent light beam atmospheric turbulance transmission blinking characteristic test macro is received with detection subsystem by beam emissions subsystem and light beam to be formed.As shown in Figure 1, the beam emissions subsystem comprises laser 101, convex lens 102, convex lens 103, LCD space light modulator 104, convex lens 105, convex lens 106, laser 107, convex lens 108, convex lens 109, half-reflection and half-transmission light splitting piece 110, optical transmitting antenna 111, LCD space light modulator driver module 112 and control computer 113.As shown in Figure 2, light beam receives with detection subsystem and comprises optical receiver antenna 201, convex lens 202, convex lens 203, half-reflection and half-transmission light splitting piece 204, focus lens group 205, photodetector 206, focus lens group 207, photodetector 208, data collecting card 209, data collecting card 210 and data handling machine 211.Behind the spatial coherence light signal planoconvex lens 102 and convex lens 103 conversion of laser 101 emissions; Incide on the LCD space light modulator 104; After the light signal planoconvex lens of LCD space light modulator 104 transmissive 105 and convex lens 106 conversion, incide on the half-reflection and half-transmission light splitting piece 110; And from the half-reflection and half-transmission light splitting piece 110 transmissive, get into optical transmitting antenna 111; Control computer 113 generates the random phase screen control signal, exports to LCD space light modulator 104 through LCD space light modulator driver module 112 again; Incide on the half-reflection and half-transmission light splitting piece 110 after the spatial coherence light signal planoconvex lens 108 of laser 107 emissions and convex lens 109 conversion, and, get into optical transmitting antenna 111 through 110 reflections of half-reflection and half-transmission light splitting piece; Optical transmitting antenna 111 will be transmitted into the atmospheric channel from the light signal of its input incident.Through suitably designing the parameter of convex lens 109 and convex lens 106, make from the beam diameter of the light signal of the two outgoing identical.Through suitably designing the parameter of half-reflection and half-transmission light splitting piece 110, make from the light signal of its reflection and transmission spatially overlapped.Incide on the half-reflection and half-transmission light splitting piece 204 after light signal planoconvex lens 202 that optical receiver antenna 201 is received and convex lens 203 conversion; Wherein a kind of light signal of wavelength by half-reflection and half-transmission light splitting piece 204 reflection after focus lens group 207 incide on the photodetector 208, the light signal of another kind of wavelength from half-reflection and half-transmission light splitting piece 204 transmissive after focus lens group 205 incide on the photodetector 206; The output signal of photodetector 208 is input in the data handling machine 211 through data collecting card 209, and the output signal of photodetector 206 is input in the data handling machine 211 through data collecting card 210.Photodetector 206 is selected high bandwidth avalanche photodide detector APD for use with photodetector 208, the spatial coherence light signal of laser 101 and laser 107 output different wave lengths.The light signal that photodetector 208 is surveyed is the light signal of laser 101 emissions, and the light signal that photodetector 206 is surveyed is the light signal of laser 107 emissions.
The concrete implementation of pseudo-partially coherent light beam atmospheric turbulance transmission blinking characteristic method of testing is following:
Make laser 101 and laser 107 in running order, the output light signal; Control computer 113 per blanking time of T
1Just generate a new random phase screen control signal, and export to LCD space light modulator 104, to realize modulation the Wave-front phase that incides the light signal on the LCD space light modulator 104 through LCD space light modulator driver module 112.
In laser signal transmission and detection; Use scintiloscope synchro measure receives the average air index structural constant in path with the detection subsystem position from beam emissions subsystem position to light beam, and difference path average air index structural constant measured value constantly is kept among the file A003.
With the data among the file A001 in proper order, with N by the time order and function of preserving
1Individual data are one group and divide into groups N
1>=128; Each grouping A004 to the data among the file A001, do following calculating:
StepA001: the value that positive integer variable j is set;
StepA002: make variable S
1=0, m=0;
StepA003: if m+j≤N
1, then
d
M+kExpression grouping A004 with the holding time successively be m+k data of preface, otherwise commentaries on classics Step005;
StepA004:m=m+j changes Step003;
StepA005：A
1＝S
1/m；
StepA006: make variable S
2=0, m=0;
StepA007: if m+j≤N
1, then
Otherwise change Step009;
StepA008:m=m+j changes Step007;
StepA009：σ
j 2＝S
2/(m×A
1 2)。
In aforementioned calculation, j is set to different values, can calculate different variances sigma
j 2
With the data among the file A002 in proper order, with N by the time order and function of preserving
1Individual data are one group and divide into groups; Each grouping A005 to the data among the file A002, do following calculating:
StepB001: make variable S
3=0, m=1;
StepB002:S
3=S
3+ f
m, f
mExpression grouping A005 with the holding time successively be m data of preface;
StepB003: if m+1≤N
1, S then
3=S
3+ f
M+1, f
M+1Expression grouping A005 with the holding time successively be m+1 data of preface, otherwise commentaries on classics StepB005;
StepB004:m=m+1 changes StepB003;
StepB005：A
2＝S
3/m；
StepB006: make variable S
4=0, m=1;
StepB007：S
4＝S
4+(f
m-A
2)
2；
StepB008: if m+1≤N
1, S then
4=S
4+ (f
M+1-A
2)
2, otherwise change StepB010;
StepB009:m=m+1 changes StepB008;
StepB010：σ
0 2＝S
4/(m×A
2 2)。
Each grouping A004 and each grouping A005 are corresponding a concrete time period; According to corresponding time relationship; Retrieval is kept at the data among the file A003, can obtain and each grouping A004 and each the corresponding path of grouping A005 average air index structural constant measured value.
Based on the parameter that top calculating is used, the relative modulating frequency F=j of pseudo-partially coherent light beam.So,, can calculate variances sigma through the value of different positive integer variable j is set
j 2Variation relation A006 with relative modulating frequency F.Variances sigma
j 2It is exactly the light intensity flicker variance that the photodetector actual detection goes out.Variation relation A006 is exactly the test result of the relative modulating frequency of pseudo-partially coherent light beam to the influence of its atmospheric turbulance transmission flicker variance.
Calculation procedure according to StepB001 to StepB010; Can obtain the flicker variance test result of spatial coherence laser atmospheric turbulence transmission; According to corresponding time relationship, can find and the corresponding pseudo-partially coherent light beam atmospheric turbulance transmission flicker variance of the spatial coherence laser atmospheric turbulence transmission flicker variance of different time sections.
In order to guarantee the reliability of testing result of System and method for of the present invention, require T
1=T
2≤τ
a, N
1* T
1>=32 τ
a, τ wherein
aLength correlation time for atmospheric turbulance approximates L
0/ V
⊥, L
0Be atmospheric turbulance external measurement, V
⊥Be the mean wind speed vertical with the laser transmission path, the maximum of positive integer variable j should be less than or equal to N
1/ 32, the response time length of photodetector 206 and photodetector 208 is more than T
1And T
2Short.
Beneficial effect
The invention provides a kind of pseudo-partially coherent light beam atmospheric turbulance transmission blinking characteristic test macro and method.System and method for of the present invention can test out pseudo-partially coherent light beam when in the real atmosphere turbulent flow, transmitting, the dependence between the light intensity flicker variance that the photodetector actual detection goes out and the relative modulating frequency of pseudo-partially coherent light beam.In addition, the light intensity that System and method for of the present invention can synchro measure goes out coherent laser when in atmospheric turbulance, the transmit variance of glimmering, and with the corresponding relation of the air index structural constant value of reality.The advantage of System and method for of the present invention is that the detector integrates time span sets through calculating parameter, has good flexibility.The result who utilizes System and method for of the present invention to test out helps the application system of using pseudo-partially coherent light beam to suppress the light intensity flicker that atmospheric turbulance causes is optimized design.
Description of drawings
Fig. 1 is a beam emissions subsystem sketch map, and Fig. 2 is that light beam receives and the detection subsystem sketch map.
Embodiment
Below in conjunction with accompanying drawing the present invention is done further explanation.
In this execution mode, it is the semiconductor laser of 800nm that laser 101 is selected wavelength for use, output TEM
00It is the semiconductor laser of 808nm that the spatial coherence laser signal of mould, laser 107 are selected wavelength for use, output TEM
00The spatial coherence laser signal of mould; The pure phase place LCD space light modulator of high accuracy that LCD space light modulator 104 selects for use German Holoeye company to produce; Optical transmitting antenna 111 is selected Cassegrainian telescope for use; Optical receiver antenna 201 is selected Cassegrainian telescope for use; Photodetector 206 is selected picosecond avalanche photodide detector for use, and photodetector 208 is selected picosecond avalanche photodide detector for use, the average air index structural constant of scintiloscope measuring route that uses Chinese Academy of Sciences's Anhui ray machine to be developed.Because the wavelength of laser 101 and laser 107 differs very little, so the difference of the light intensity flicker variance of the light signal of two lasers emissions causing of wavelength difference is very little, in calculating, can ignore.
The purpose of this invention is to provide a kind of pseudo-partially coherent light beam atmospheric turbulance transmission blinking characteristic test macro and method.Pseudo-partially coherent light beam atmospheric turbulance transmission blinking characteristic test macro is received with detection subsystem by beam emissions subsystem and light beam to be formed.As shown in Figure 1, the beam emissions subsystem comprises laser 101, convex lens 102, convex lens 103, LCD space light modulator 104, convex lens 105, convex lens 106, laser 107, convex lens 108, convex lens 109, half-reflection and half-transmission light splitting piece 110, optical transmitting antenna 111, LCD space light modulator driver module 112 and control computer 113.As shown in Figure 2, light beam receives with detection subsystem and comprises optical receiver antenna 201, convex lens 202, convex lens 203, half-reflection and half-transmission light splitting piece 204, focus lens group 205, photodetector 206, focus lens group 207, photodetector 208, data collecting card 209, data collecting card 210 and data handling machine 211.Behind the spatial coherence light signal planoconvex lens 102 and convex lens 103 conversion of laser 101 emissions; Incide on the LCD space light modulator 104; After the light signal planoconvex lens of LCD space light modulator 104 transmissive 105 and convex lens 106 conversion, incide on the half-reflection and half-transmission light splitting piece 110; And from the half-reflection and half-transmission light splitting piece 110 transmissive, get into optical transmitting antenna 111; Control computer 113 generates the random phase screen control signal, exports to LCD space light modulator 104 through LCD space light modulator driver module 112 again; Incide on the half-reflection and half-transmission light splitting piece 110 after the spatial coherence light signal planoconvex lens 108 of laser 107 emissions and convex lens 109 conversion, and, get into optical transmitting antenna 111 through 110 reflections of half-reflection and half-transmission light splitting piece; Optical transmitting antenna 111 will be transmitted into the atmospheric channel from the light signal of its input incident.Through suitably designing the parameter of convex lens 109 and convex lens 106, make from the beam diameter of the light signal of the two outgoing identical.Through suitably designing the parameter of half-reflection and half-transmission light splitting piece 110, make from the light signal of its reflection and transmission spatially overlapped.Incide on the half-reflection and half-transmission light splitting piece 204 after light signal planoconvex lens 202 that optical receiver antenna 201 is received and convex lens 203 conversion; Wherein a kind of light signal of wavelength by half-reflection and half-transmission light splitting piece 204 reflection after focus lens group 207 incide on the photodetector 208, the light signal of another kind of wavelength from half-reflection and half-transmission light splitting piece 204 transmissive after focus lens group 205 incide on the photodetector 206; The output signal of photodetector 208 is input in the data handling machine 211 through data collecting card 209, and the output signal of photodetector 206 is input in the data handling machine 211 through data collecting card 210.Photodetector 206 is selected high bandwidth avalanche photodide detector APD for use with photodetector 208, the spatial coherence light signal of laser 101 and laser 107 output different wave lengths.The light signal that photodetector 208 is surveyed is the light signal of laser 101 emissions, and the light signal that photodetector 206 is surveyed is the light signal of laser 107 emissions.
The concrete implementation of pseudo-partially coherent light beam atmospheric turbulance transmission blinking characteristic method of testing is following:
Make laser 101 and laser 107 in running order, the output light signal; Control computer 113 per blanking time of T
1Just generate a new random phase screen control signal, and export to LCD space light modulator 104, to realize modulation the Wave-front phase that incides the light signal on the LCD space light modulator 104 through LCD space light modulator driver module 112.
In laser signal transmission and detection; Use scintiloscope synchro measure receives the average air index structural constant in path with the detection subsystem position from beam emissions subsystem position to light beam, and difference path average air index structural constant measured value constantly is kept among the file A003.
With the data among the file A001 in proper order, with N by the time order and function of preserving
1Individual data are one group and divide into groups N
1>=128; Each grouping A004 to the data among the file A001, do following calculating:
StepA001: the value that positive integer variable j is set;
StepA002: make variable S
1=0, m=0;
StepA003: if m+j≤N
1, then
d
M+kExpression grouping A004 with the holding time successively be m+k data of preface, otherwise commentaries on classics Step005;
StepA004:m=m+j changes Step003;
StepA005：A
1＝S
1/m；
StepA006: make variable S
2=0, m=0;
StepA007: if m+j≤N
1, then
Otherwise change Step009;
StepA008:m=m+j changes Step007;
StepA009：σ
j 2＝S
2/(m×A
1 2)。
In aforementioned calculation, j is set to different values, can calculate different variances sigma
j 2
With the data among the file A002 in proper order, with N by the time order and function of preserving
1Individual data are one group and divide into groups; Each grouping A005 to the data among the file A002, do following calculating:
StepB001: make variable S
3=0, m=1;
StepB002:S
3=S
3+ f
m, f
mExpression grouping A005 with the holding time successively be m data of preface;
StepB003: if m+1≤N
1, S then
3=S
3+ f
M+1, f
M+1Expression grouping A005 with the holding time successively be m+1 data of preface, otherwise commentaries on classics StepB005;
StepB004:m=m+1 changes StepB003;
StepB005：A
2＝S
3/m；
StepB006: make variable S
4=0, m=1;
StepB007：S
4＝S
4+(f
m-A
2)
2；
StepB008: if m+1≤N
1, S then
4=S
4+ (f
M+1-A
2)
2, otherwise change StepB010;
StepB009:m=m+1 changes StepB008;
StepB010：σ
0 2＝S
4/(m×A
2 2)。
Each grouping A004 and each grouping A005 are corresponding a concrete time period; According to corresponding time relationship; Retrieval is kept at the data among the file A003, can obtain and each grouping A004 and each the corresponding path of grouping A005 average air index structural constant measured value.
Based on the parameter that top calculating is used, the relative modulating frequency F=j of pseudo-partially coherent light beam.So,, can calculate variances sigma through the value of different positive integer variable j is set
j 2Variation relation A006 with relative modulating frequency F.Variances sigma
j 2It is exactly the light intensity flicker variance that the photodetector actual detection goes out.Variation relation A006 is exactly the test result of the relative modulating frequency of pseudo-partially coherent light beam to the influence of its atmospheric turbulance transmission flicker variance.
Calculation procedure according to StepB001 to StepB010; Can obtain the flicker variance test result of spatial coherence laser atmospheric turbulence transmission; According to corresponding time relationship, can find and the corresponding pseudo-partially coherent light beam atmospheric turbulance transmission flicker variance of the spatial coherence laser atmospheric turbulence transmission flicker variance of different time sections.
In order to guarantee the reliability of testing result of System and method for of the present invention, require T
1=T
2≤τ
a, N
1* T
1>=32 τ
a, τ wherein
aLength correlation time for atmospheric turbulance approximates L
0/ V
⊥, L
0Be atmospheric turbulance external measurement, V
⊥Be the mean wind speed vertical with the laser transmission path, the maximum of positive integer variable j should be less than or equal to N
1/ 32, the response time length of photodetector 206 and photodetector 208 is more than T
1And T
2Short.
Claims (1)
1. pseudo-partially coherent light beam atmospheric turbulance transmission blinking characteristic test macro and method is characterized in that system configuration and implementation method are following:
Pseudo-partially coherent light beam atmospheric turbulance transmission blinking characteristic test macro is received with detection subsystem by beam emissions subsystem and light beam to be formed; The beam emissions subsystem comprises laser 101, convex lens 102, convex lens 103, LCD space light modulator 104, convex lens 105, convex lens 106, laser 107, convex lens 108, convex lens 109, half-reflection and half-transmission light splitting piece 110, optical transmitting antenna 111, LCD space light modulator driver module 112 and control computer 113; Light beam receives with detection subsystem and comprises optical receiver antenna 201, convex lens 202, convex lens 203, half-reflection and half-transmission light splitting piece 204, focus lens group 205, photodetector 206, focus lens group 207, photodetector 208, data collecting card 209, data collecting card 210 and data handling machine 211; Behind the spatial coherence light signal planoconvex lens 102 and convex lens 103 conversion of laser 101 emissions; Incide on the LCD space light modulator 104; After the light signal planoconvex lens of LCD space light modulator 104 transmissive 105 and convex lens 106 conversion, incide on the half-reflection and half-transmission light splitting piece 110; And from the half-reflection and half-transmission light splitting piece 110 transmissive, get into optical transmitting antenna 111; Control computer 113 generates the random phase screen control signal, exports to LCD space light modulator 104 through LCD space light modulator driver module 112 again; Incide on the half-reflection and half-transmission light splitting piece 110 after the spatial coherence light signal planoconvex lens 108 of laser 107 emissions and convex lens 109 conversion, and, get into optical transmitting antenna 111 through 110 reflections of half-reflection and half-transmission light splitting piece; Optical transmitting antenna 111 will be transmitted into from the light signal of its input incident the atmospheric channel; Through suitably designing the parameter of convex lens 109 and convex lens 106, make from the beam diameter of the light signal of the two outgoing identical; Through suitably designing the parameter of half-reflection and half-transmission light splitting piece 110, make from the light signal of its reflection and transmission spatially overlapped; Incide on the half-reflection and half-transmission light splitting piece 204 after light signal planoconvex lens 202 that optical receiver antenna 201 is received and convex lens 203 conversion; Wherein a kind of light signal of wavelength by half-reflection and half-transmission light splitting piece 204 reflection after focus lens group 207 incide on the photodetector 208, the light signal of another kind of wavelength from half-reflection and half-transmission light splitting piece 204 transmissive after focus lens group 205 incide on the photodetector 206; The output signal of photodetector 208 is input in the data handling machine 211 through data collecting card 209, and the output signal of photodetector 206 is input in the data handling machine 211 through data collecting card 210; Photodetector 206 is selected high bandwidth avalanche photodide detector APD for use with photodetector 208, the spatial coherence light signal of laser 101 and laser 107 output different wave lengths; The light signal that photodetector 208 is surveyed is the light signal of laser 101 emissions, and the light signal that photodetector 206 is surveyed is the light signal of laser 107 emissions;
The concrete implementation of pseudo-partially coherent light beam atmospheric turbulance transmission blinking characteristic method of testing is following:
Make laser 101 and laser 107 in running order, the output light signal; Control computer 113 per blanking time of T
1Just generate a new random phase screen control signal, and export to LCD space light modulator 104, to realize modulation the Wave-front phase that incides the light signal on the LCD space light modulator 104 through LCD space light modulator driver module 112;
Data handling machine 211 is through data collecting card 209 per blanking time of T
2Just read the light signal that photodetector 208 detects, and the data that read are kept among the computer documents A001; Data handling machine 211 is through data collecting card 210 per blanking time of T
2Just read the light signal that photodetector 206 detects, and the data that read are kept among the file A002; In the system and method for the present invention, T
1=T
2
In laser signal transmission and detection; Use scintiloscope synchro measure receives the average air index structural constant in path with the detection subsystem position from beam emissions subsystem position to light beam, and difference path average air index structural constant measured value constantly is kept among the file A003;
With the data among the file A001 in proper order, with N by the time order and function of preserving
1Individual data are one group and divide into groups N
1>=128; Each grouping A004 to the data among the file A001, do following calculating:
StepA001: the value that positive integer variable j is set;
StepA002: make variable S
1=0, m=0;
StepA003: if m+j≤N
1, then
d
M+kExpression grouping A004 with the holding time successively be m+k data of preface, otherwise commentaries on classics Step005;
StepA004:m=m+j changes Step003;
StepA005：A
1＝S
1/m；
StepA006: make variable S
2=0, m=0;
StepA007: if m+j≤N
1, then
Otherwise change Step009;
StepA008:m=m+j changes Step007;
StepA009：σ
j 2＝S
2/(m×A
1 2)；
In aforementioned calculation, j is set to different values, can calculate different variances sigma
j 2
With the data among the file A002 in proper order, with N by the time order and function of preserving
1Individual data are one group and divide into groups; Each grouping A005 to the data among the file A002, do following calculating:
StepB001: make variable S
3=0, m=1;
StepB002:S
3=S
3+ f
m, f
mExpression grouping A005 with the holding time successively be m data of preface;
StepB003: if m+1≤N
1, S then
3=S
3+ f
M+1, f
M+1Expression grouping A005 with the holding time successively be m+1 data of preface, otherwise commentaries on classics StepB005;
StepB004:m=m+1 changes StepB003;
StepB005：A
2＝S
3/m；
StepB006: make variable S
3=0, m=1;
StepB007：S
4＝S
4+(f
m-A
2)
2；
StepB008: if m+1≤N
1, S then
4=S
4+ (f
M+1-A
2)
2, otherwise change StepB010;
StepB009:m=m+1 changes StepB008;
StepB010：σ
0 2＝S
4/(m×A
2 2)；
Each grouping A004 and each grouping A005 are corresponding a concrete time period; According to corresponding time relationship; Retrieval is kept at the data among the file A003, can obtain and each grouping A004 and each the corresponding path of grouping A005 average air index structural constant measured value;
According to the parameter that top calculating is used, the relative modulating frequency F=j of pseudo-partially coherent light beam; So,, can calculate variances sigma through the value of different positive integer variable j is set
j 2Variation relation A006 with relative modulating frequency F; Variances sigma
j 2It is exactly the light intensity flicker variance that the photodetector actual detection goes out; Variation relation A006 is exactly the test result of the relative modulating frequency of pseudo-partially coherent light beam to the influence of its atmospheric turbulance transmission flicker variance;
Calculation procedure based on StepB001 to StepB010; Can obtain the flicker variance test result of spatial coherence laser atmospheric turbulence transmission; According to corresponding time relationship, can find and the corresponding pseudo-partially coherent light beam atmospheric turbulance transmission flicker variance of the spatial coherence laser atmospheric turbulence transmission flicker variance of different time sections;
In order to guarantee the reliability of testing result of System and method for of the present invention, require T
1=T
2≤τ
a, N
1* T
1>=32 τ
a, τ wherein
aLength correlation time for atmospheric turbulance approximates L
0/ V
⊥, L
0Be atmospheric turbulance external measurement, V
⊥Be the mean wind speed vertical with the laser transmission path, the maximum of positive integer variable j should be less than or equal to N
1/ 32, the response time length of photodetector 206 and photodetector 208 is more than T
1And T
2Short.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210232667.5A CN102739314B (en) | 2012-07-06 | 2012-07-06 | Test system and method for scintillation characteristic of fake partially coherent light transmitted in atmosphere turbulence |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210232667.5A CN102739314B (en) | 2012-07-06 | 2012-07-06 | Test system and method for scintillation characteristic of fake partially coherent light transmitted in atmosphere turbulence |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN102739314A true CN102739314A (en) | 2012-10-17 |
| CN102739314B CN102739314B (en) | 2015-07-15 |
Family
ID=46994176
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201210232667.5A Expired - Fee Related CN102739314B (en) | 2012-07-06 | 2012-07-06 | Test system and method for scintillation characteristic of fake partially coherent light transmitted in atmosphere turbulence |
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Cited By (6)
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| CN103048791A (en) * | 2013-01-18 | 2013-04-17 | 苏州大学 | Method for producing partially coherent Airy beams |
| CN103618568A (en) * | 2013-11-16 | 2014-03-05 | 长春理工大学 | Laser pulse transmission time widening and channel transfer function measuring method in turbulent atmospheric channel |
| CN108760226A (en) * | 2018-05-04 | 2018-11-06 | 西华大学 | A kind of method and device of atmospheric sounding Turbulent mixing |
| CN110865353A (en) * | 2018-08-10 | 2020-03-06 | 极光飞行科学公司 | System and method for reducing DVE impact on LIDAR returns |
| CN111076831A (en) * | 2019-12-05 | 2020-04-28 | 常州大学 | Laser antenna wavefront detection system for space laser communication equipment |
| CN112113746A (en) * | 2020-09-08 | 2020-12-22 | 广州广电计量检测股份有限公司 | Calibration method and calibration system of light source stroboscopic tester based on external modulation light source method |
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103048791A (en) * | 2013-01-18 | 2013-04-17 | 苏州大学 | Method for producing partially coherent Airy beams |
| CN103618568A (en) * | 2013-11-16 | 2014-03-05 | 长春理工大学 | Laser pulse transmission time widening and channel transfer function measuring method in turbulent atmospheric channel |
| CN108760226A (en) * | 2018-05-04 | 2018-11-06 | 西华大学 | A kind of method and device of atmospheric sounding Turbulent mixing |
| CN110865353A (en) * | 2018-08-10 | 2020-03-06 | 极光飞行科学公司 | System and method for reducing DVE impact on LIDAR returns |
| CN110865353B (en) * | 2018-08-10 | 2024-02-09 | 极光飞行科学公司 | System and method for reducing DVE impact on LIDAR return |
| CN111076831A (en) * | 2019-12-05 | 2020-04-28 | 常州大学 | Laser antenna wavefront detection system for space laser communication equipment |
| CN112113746A (en) * | 2020-09-08 | 2020-12-22 | 广州广电计量检测股份有限公司 | Calibration method and calibration system of light source stroboscopic tester based on external modulation light source method |
| CN112113746B (en) * | 2020-09-08 | 2022-08-05 | 广州广电计量检测股份有限公司 | Calibration method and calibration system of light source stroboscopic tester based on external modulation light source method |
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