CN201583662U - Laser radar for upper atmosphere Rayleigh scattering wind-temperature detection - Google Patents
Laser radar for upper atmosphere Rayleigh scattering wind-temperature detection Download PDFInfo
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- CN201583662U CN201583662U CN2009203534927U CN200920353492U CN201583662U CN 201583662 U CN201583662 U CN 201583662U CN 2009203534927 U CN2009203534927 U CN 2009203534927U CN 200920353492 U CN200920353492 U CN 200920353492U CN 201583662 U CN201583662 U CN 201583662U
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Abstract
The utility model discloses laser radar for upper atmosphere Rayleigh scattering wind-temperature detection, which is used for upper atmosphere detection. The laser radar consists of a laser emitting unit (1), a receiving telescope (2), an optical fiber (3), a frequency discrimination unit (4) and a data collecting and processing unit, wherein the output frequency of laser emission adopts the atomic absorption frequency stabilization; and the frequency discrimination unit adopts the three channels of a same atom to carry out the frequency discrimination, so as to obtain the intensities of the full spectrum, the left peripheral spectrum and the right peripheral spectrum of an echo wave spectrum respectively for the simultaneous acquisition of the density, temperature and wind field of the atmosphere. The utility model has the advantages of strong background light suppressing capability, high frequency discrimination precision, small detection error and stable and reliable working.
Description
Technical field:
The utility model relates to laser radar, relates in particular to the upper atmosphere detecting laser radar.
Background technology:
Along with the extension of mankind's activity to the space, upper atmosphere situation particularly wind field has considerable influence to spacecraft.Yet along with the increase of atmosphere height, gasoloid reduces gradually, and rice (Mie) is scattered back the glistening light of waves to be reduced gradually, and the Rayleigh scattering echo light proportion that the less molecule of yardstick produces increases gradually.This not only makes laser radar echo weaken, and because the influence of molecular atoms kinetic energy, the live width that the frequency spectrum of echo optical signal is launched laser has had very big video stretching, has increased the difficulty that high-altitude Rayleigh scattering wind field is surveyed.
Document " Doppler anemometry laser radar progress " (atmosphere and environmental optics journal, 2007,2 (3): 161-168) exploration of various survey wind technology has been done comparatively comprehensively to sum up.Utilize the laser radar survey wind scheme of Rayleigh scattering mechanism to mainly contain two kinds: a kind of is the dual edge frequency discrimination technology that adopts the F-P etalon, and another kind is the single edges frequency discrimination technology that adopts iodine molecule to absorb.
The dual edge frequency discrimination technology of F-P etalon (the infrared and laser engineering of document " research of Rayleigh scattering anemometry laser radar receiver ", 2008, the 37th volume, supplementary issue, the 120-124 page or leaf) is two edges that the transmission peaks of two F-P etalons are arranged at Rayleigh scattering echo spectrum respectively, because of the echo optical spectrum can be because the translation of the change of wind velocity left and right sides, the light intensity that sees through two F-P etalons is changed, determine wind direction and wind speed according to the light-intensity difference that sees through two F-P etalons, this technology has higher frequency discrimination sensitivity, but the F-P etalon costs an arm and a leg, and it is comparatively responsive to temperature and mechanical vibration, the frequency discrimination error that environmental change brings is bigger, has influenced detection accuracy.
Iodine molecule absorption edge frequency discrimination technology (document " high spectrum iodine molecule and dual edge Doppler anemometry laser radar technology are relatively " Chinese Marine University's journal, 2004,34 (3): be 489～49) by laser frequency is set, make an edge of Rayleigh scattering echo spectrum place the edge of iodine molecule absorption spectra, when echo spectrum because the variation of wind field and the left and right sides translation time, the light intensity that sees through the iodine molecule absorption cell can change, can determine wind direction and wind speed according to the size that changes, owing to adopted the stable iodine molecule absorption spectrum of position of spectral line to echo light frequency discrimination with to the emission laser frequency stabilization, make the frequency discrimination error reduce, improved detection accuracy, but, influenced frequency discrimination sensitivity owing to can only adopt a rim detection.
Wiscons in University utilizes high spectral resolution lidar (document " Demonstration of a high-spectral-resolution lidar based on aniodine absorption filter " Optics Letters, 1994,19 (3): 1) adopt iodine molecule absorbing filter frequency discrimination, this laser radar can the atmospheric sounding temperature, but wind field that can not atmospheric sounding.
Summary of the invention:
The purpose of this utility model is: a kind of high-altitude air Rayleigh scattering wind-warm syndrome laser radar is provided.This laser radar is made up of laser emission element, receiving telescope, optical fiber, frequency discrimination unit and data acquisition and processing unit.Wherein, the output frequency of emission laser adopts the atomic absorption frequency stabilization, the frequency discrimination unit adopts three passage frequency discriminations with atomic frequency-stabilized laser unit atom of the same race, obtain the intensity of full spectrum, left hand edge spectrum and the right hand edge spectrum of echo spectrum respectively, can obtain density, temperature and the wind field of atmosphere simultaneously, detecting error is little, and working stability is reliable.
To achieve these goals, the utility model adopts following technical scheme:
1, structure
High-altitude air Rayleigh scattering wind-warm syndrome laser radar is made up of laser emission element, receiving telescope, optical fiber, frequency discrimination unit and data acquisition and processing unit.The laser outbound course of laser emission element is placed with the axis of receiving telescope is all vertical with surface level, the receiving end of optical fiber is positioned on the focus of receiving telescope and is coaxial with receiving telescope, output terminal places on the focus of frequency discrimination unit convex lens and is coaxial with convex lens, and the output terminal of three photomultipliers in frequency discrimination unit is connected respectively to the input end of data acquisition and processing unit.
Wherein, the structure of laser emission element is: the placement of laser instrument makes the transmit direction of laser vertical with surface level, first light splitting piece places the laser instrument output light path and is miter angle with light path, in the reflected light path of first light splitting piece, place the 6th atom bubble and photodetector successively, the output terminal of photodetector is connected to the input end of frequency stabilization controller, and the output terminal of frequency stabilization controller is connected to the frequency stabilization control end of laser instrument;
The frequency discrimination unit is made up of convex lens, optical filter, spectrum groupware, left side band atom frequency discrimination passage, the right band atom frequency discrimination passage and center band atom frequency discrimination passage; The 4th polarizing prism of convex lens, optical filter and spectrum groupware is arranged in co-axial alignment successively, spectrum groupware is made up of the 4th polarizing prism, second light splitting piece and catoptron, transmitted light direction at the 4th polarizing prism is arranged in order second light splitting piece and catoptron, and the transmitted light direction of second light splitting piece and catoptron and the 4th polarizing prism is miter angle; Refract light direction at the 4th polarizing prism is placed left side band atom frequency discrimination passage over against refract light, reflected light direction at second light splitting piece is placed the right band atom frequency discrimination passage over against reflected light, places center band atom frequency discrimination passage in the reflected light direction of catoptron over against reflected light.
The structure of left side band atom frequency discrimination passage is: first magnet, first atom bubble, second magnet, first polarizing prism, first quarter wave plate, the 3rd magnet, second atom bubble, the 4th magnet and first photomultiplier be arranged in co-axial alignment successively; The polarization direction of first polarizing prism is vertical with the polarization direction of the 4th polarizing prism refract light; Dress sodium atom in first atom bubble, place the centre of cylinder type first thermostatic tube, thermostat temperature is 170 degree Celsius, first magnet, second magnet are circular ring type, place the two ends of first thermostatic tube, produce the magnetic field of 200Gs at the first atom bubble place, first magnetic shielding cylinder is wrapped in the outside of first magnet, second magnet and first thermostatic tube; Dress sodium atom in second atom bubble, place the centre of cylinder type second thermostatic tube, thermostat temperature is 170 degree Celsius, the 3rd magnet, the 4th magnet are circular ring type, place the two ends of second thermostatic tube, produce the magnetic field of 200Gs at the second atom bubble place, second magnetic shielding cylinder is wrapped in the outside of the 3rd magnet, the 4th magnet and second thermostatic tube, and the polarization direction of the crystalline axis direction of first wave plate and first polarizing prism is positive miter angle;
The structure of the right band atom frequency discrimination passage and the difference of left side band atom frequency discrimination passage only are that the polarization direction of second polarizing prism is vertical with the second light splitting piece polarization of reflected light direction; The polarization direction of the crystalline axis direction of second quarter wave plate and second polarizing prism is negative miter angle;
The structure of center band atom frequency discrimination passage is: the 9th magnet, Wuyuan Zi Pao, the tenth magnet, the 3rd polarizing prism and the 3rd photomultiplier be arranged in co-axial alignment successively; The polarization direction of the 3rd polarizing prism is vertical with mirror reflects polarisation of light direction; Dress sodium atom in the Zi Pao of Wuyuan, place the centre of cylinder type the 5th thermostatic tube, thermostat temperature is 170 degree Celsius, the 9th magnet, the tenth magnet are circular ring type, place the two ends of the 5th thermostatic tube, produce the magnetic field of 2200Gs at Wuyuan Zi Pao place, the 5th magnetic shielding cylinder is wrapped in the outside of the 9th magnet, the tenth magnet and the 5th thermostatic tube.
2, principle
The energy level transition frequency of atom is a parameter comparatively stable in the universe, adopts the mode of atomic absorption frequency stabilization, and the frequency stabilization of laser radar being launched laser can make the frequency of emission laser have the higher stable degree on the atomic absorption peak.
When emission laser arrives high-altitude (about 10-80 kilometer), Rayleigh scattering can take place in the molecule that runs in the atmosphere, because the motion of molecule, the spectrum that makes the spectrum of Rayleigh scattering light launch laser has had broadening and translation, detect the spectrum widening and the translational movement of high-altitude some Rayleigh scattering echoes light, can extrapolate the temperature and the wind field of this atmosphere.
Echo light frequency discrimination unit also adopts the atom identical with laser emission element to carry out frequency discrimination, the order transition frequency that uses atomic energy equally has the characteristics of high stability, make and have stable frequency location relation between each frequency discrimination curve and the emission laser spectrum curve, therefore can more accurately detect the broadening and the translational movement of Rayleigh echo spectrum, make the precision of atmospheric sounding temperature and wind field higher, stability is better.
Atom is in the magnetic field, and the Zeeman level division can take place, Faraday can take place if enter atom system with the polarized light of atomic energy level wavelength resonances, utilize this atomic physics mechanism, place the polarizing prism of quadrature at the atom system two ends, and add magnetic field to atom system, echo polarisation of light direction is revolved the odd-multiple that turn 90 degrees in atom system, can be smoothly polarizing prism by quadrature, the light of other wavelength is suppressed by the polarizing prism of quadrature because of Faraday does not take place, and reaches super arrowband atom filter and frequency discrimination purpose.The transmission spectral pattern of center band atom frequency discrimination passage is three peak shape attitudes of both wings and central homology, and its center transmission peaks covers the whole spectrum of echo light, and the signal intensity that obtains is the bulk strength of echo spectrum.
Be in the atom system in the magnetic field, absorb the right-handed rotation of red shift and the left-handed rotation of blue shift, and do not absorb the right-handed rotation of the left-handed rotation and the blue shift of red shift, utilize this atomic physics mechanism, allow polarization light signal through quarter wave plate take place left-handed or dextrorotation after, enter the atom system that is added with magnetic field again, the right-handed rotation of red shift and the left-handed rotation of generation blue shift just will take place to be sponged, and the left-handed rotation that red shift takes place can pass through atom system smoothly with the right-handed rotation that blue shift takes place, and can realize the selection to the left and right sideband of signal spectrum like this.The transmitted spectrum of left and right sideband atom frequency discrimination passage all is the single-blade form, and left side band atom frequency discrimination passage transmission peaks is positioned at the left hand edge of echo spectrum, and the signal that obtains is the intensity of echo light left hand edge spectrum; The transmission peaks of the right band atom frequency discrimination passage is positioned at the right hand edge of echo spectrum, and the signal that obtains is the intensity of echo light right hand edge spectrum.
Can calculate the temperature and the wind field of upper atmosphere according to the intensity of detected echo spectrum left hand edge, right hand edge and full spectrum.
Advantage of the present utility model is: laser radar of the present utility model has adopted the atom filter measure of super narrow bandwidth, transmitted spectrum narrow bandwidth, the effectively interference of the outer bias light of inhibition zone, the signal to noise ratio (S/N ratio) of raising received signal; Laser radar of the present utility model adopts three frequency discrimination passages, obtains the intensity of full spectrum, left hand edge spectrum and the right hand edge spectrum of echo spectrum respectively, thus density, temperature and the wind field of atmospheric sounding simultaneously; Laser frequency stabilization benchmark of the present utility model and atom frequency discrimination curve are based upon on the atomic transition energy level of the same race basis, Wavelength stabilized nothing drift, and frequency discrimination precision height, detecting error is little, and working stability is reliable.
Description of drawings:
Fig. 1 is the structural representation of high-altitude air Rayleigh scattering wind-warm syndrome laser radar.
Wherein: 1 laser emission element, 2 receiving telescopes, 3 optical fiber, 4 frequency discrimination unit, 5 data acquisitions and processing unit.
Fig. 2 is the structural representation of laser emission element.
Wherein: 11 laser instruments, 12 first light splitting pieces, 13 the 6th atoms bubble, 14 photodetectors, 15 frequency stabilization controllers.
Fig. 3 is the structural representation of frequency discrimination unit.
Wherein: 3 optical fiber, 4 frequency discrimination unit, 41 left side band atom frequency discrimination passages, 42 the right band atom frequency discrimination passages, 43 center band atom frequency discrimination passages, 44 convex lens, 45 optical filters, 46 spectrum groupware;
101 first magnetic shielding cylinders, 102 first magnets, 103 first thermostatic tubes, 104 first atoms bubble, 105 second magnets, 106 first polarizing prisms, 107 first quarter wave plates, 108 second magnetic shielding cylinders, 109 the 3rd magnets, 110 second thermostatic tubes, 111 second atoms bubble, 112 the 4th magnets, 113 first photomultipliers, 206 second polarizing prisms, 207 second quarter wave plates, 213 second photomultipliers, 301 the 5th magnetic shielding cylinders, 302 the 9th magnets, 303 the 5th thermostatic tubes, 304 Wuyuan Zi Pao, 305 the tenth magnets, 306 the 3rd polarizing prisms, 313 the 3rd photomultipliers, 461 the 4th polarizing prisms, 462 second light splitting pieces, 463 catoptrons.
Fig. 4 is the atomic absorption frequency stabilization schematic diagram of laser instrument.
1101 laser spectrum curves, 1301 atomic absorption light spectral curves.
Fig. 5 is the Rayleigh echo temperature detection principle figure of atom frequency discrimination.
Wherein: 4111 left side band atom frequency discrimination curve, the 2001 Rayleigh echo curves of spectrum, 4211 the right band atom frequency discrimination curve, 4311 center band atom frequency discrimination curve.
Fig. 6 is the Rayleigh echo wind field detection principle figure of atom frequency discrimination.
Wherein: 4111 left side band atom frequency discrimination curve, the 2001 Rayleigh echo curves of spectrum, 4211 the right band atom frequency discrimination curve, 4311 center band atom frequency discrimination curve.
Embodiment:
Below in conjunction with accompanying drawing, the utility model is further described.
1, structure
High-altitude air Rayleigh scattering wind-warm syndrome laser radar is made up of laser emission element 1, receiving telescope 2, optical fiber 3, frequency discrimination unit 4 and data acquisition and processing unit 5.The laser outbound course of laser emission element 1 and the axis of receiving telescope 2 are all vertical with surface level to be placed, the receiving end of optical fiber 3 is positioned on the focus of receiving telescope 2 and is coaxial with receiving telescope 2, output terminal places on the focus of frequency discrimination unit 4 convex lens 44 and is coaxial with convex lens 44, and three photomultipliers 113,213 of frequency discrimination unit 4 and 313 output terminal are connected respectively to the input end of data acquisition and processing unit 5.
Wherein, the structure of laser emission element 1 is: the placement of laser instrument 11 makes the transmit direction of laser vertical with surface level, first light splitting piece 12 places laser instrument 11 output light paths and is miter angle with light path, in the reflected light path of first light splitting piece 12, place the 6th atom bubble 13 and photodetector 14 successively, the output terminal of photodetector 14 is connected to the input end of frequency stabilization controller 15, and the output terminal of frequency stabilization controller 15 is connected to the frequency stabilization control end of laser instrument 11;
The structure of left side band atom frequency discrimination passage 41 is: first magnet 102, first atom bubble, 104, second magnet 105, first polarizing prism 106, first quarter wave plate 107, the 3rd magnet 109, second atom bubble the 111, the 4th magnet 112 and first photomultiplier 113 be arranged in co-axial alignment successively; The polarization direction of first polarizing prism 106 is vertical with the polarization direction of the 4th polarizing prism 461 refract lights; Dress sodium atom in first atom bubble 104, place the centre of cylinder type first thermostatic tube 103, thermostat temperature is 170 degree Celsius, first magnet 102, second magnet 105 are circular ring type, place the two ends of first thermostatic tube 103, steep the magnetic field that 104 places produce 200Gs at first atom, first magnetic shielding cylinder 101 is wrapped in the outside of first magnet 102, second magnet 105 and first thermostatic tube 103; Dress sodium atom in second atom bubble 111, place the centre of cylinder type second thermostatic tube 110, thermostat temperature is 170 degree Celsius, the 3rd magnet 109, the 4th magnet 112 are circular ring type, place the two ends of second thermostatic tube 110, steep the magnetic field that 111 places produce 200Gs at second atom, second magnetic shielding cylinder 108 is wrapped in the outside of the 3rd magnet 109, the 4th magnet 112 and second thermostatic tube 110, and the polarization direction of the crystalline axis direction of first wave plate 107 and first polarizing prism 106 is positive miter angle;
The structure of the right band atom frequency discrimination passage 42 and the difference of left side band atom frequency discrimination passage 41 only are that the polarization direction of second polarizing prism 206 is vertical with second light splitting piece, 462 polarization of reflected light directions; The polarization direction of the crystalline axis direction of second quarter wave plate 207 and second polarizing prism 206 is negative miter angle;
The structure of center band atom frequency discrimination passage 43 is: the 9th magnet 302, Wuyuan Zi Pao 304, the tenth magnet 305, the 3rd polarizing prism 306 and the 3rd photomultiplier 313 be arranged in co-axial alignment successively; The polarization direction of the 3rd polarizing prism 306 is vertical with catoptron 463 polarization of reflected light directions; Dress sodium atom in the Wuyuan Zi Pao 304, place the centre of cylinder type the 5th thermostatic tube 303, thermostat temperature is 170 degree Celsius, the 9th magnet 302, the tenth magnet 305 are circular ring type, place the two ends of the 5th thermostatic tube 303, produce the magnetic field of 2200Gs at Wuyuan Zi Pao 304 places, the 5th magnetic shielding cylinder 301 is wrapped in the outside of the 9th magnet 302, the tenth magnet 305 and the 5th thermostatic tube 303.
Can all adorn the K atom in each above-mentioned atom bubble, the thermostat temperature of each thermostatic tube is 150 degree Celsius, magnet in left side band atom frequency discrimination passage 41 and the right band atom frequency discrimination passage 42 produces the magnetic field of 150Gs at atom bubble place, the magnet in the center band atom frequency discrimination passage 43 produces the magnetic field of 1500Gs at atom bubble place.
Can all adorn the Li atom in each above-mentioned atom bubble, the thermostat temperature of each thermostatic tube is 300 degree Celsius, magnet in left side band atom frequency discrimination passage 41 and the right band atom frequency discrimination passage 42 produces the magnetic field of 350Gs at atom bubble place, the magnet in the center band atom frequency discrimination passage 43 produces the magnetic field of 3500Gs at atom bubble place.
2, principle
The atomic frequency-stabilized laser Laser emission: the laser of laser instrument 11 outputs is divided into two bundles through first light splitting piece 12, transmitted light is vertically to aerial emission, reflected light shines on the photodetector 14 through the 6th atom bubble 13, dress sodium atom in the 6th atom bubble 13, obtain the electric signal relevant on the photodetector 14 with sodium atom absorption spectrum curve shown in Figure 4 1301, output to frequency stabilization controller 15, frequency stabilization controller 15 is with the peak value of the absorption spectrum curve 1301 of the sodium atom frequency stabilization benchmark as emission laser, output error drive signal control laser instrument 11 output light frequencies, make the central peak of laser instrument 11 output spectrum curves 1101 be locked in the peak of sodium atom absorption curve 1301, thereby realize the atomic frequency-stabilized laser locking of laser frequency.Wherein, to obtain the method for error drive signal be the known general knowledge of those skilled in the art to the atomic absorption light spectral intensity that obtains according to photodetector 14 of frequency stabilization controller 15.
Laser radar echo receives:
The Rayleigh echo optical signal receives through receiving telescope 2 and converges in the optical fiber 3, is sent to frequency discrimination unit 4 through optical fiber 3.
Echoed signal atom frequency discrimination:
The echo optical signal planoconvex lens 44 of optical fiber 3 outputs transfers parallel beam to, behind optical filter 45 preliminary filtering interfering light, by spectrum groupware 46 echo light is assigned to each passage again: the 4th polarizing prism 461 of spectrum groupware 46 is divided into the orthogonal two-beam in polarization direction with echo light, wherein refract light enters left side band atom frequency discrimination passage 41, transmitted light shines second light splitting piece 462, second light splitting piece 462 is further divided into two bundles with echo light, wherein reflected light enters the right band atom frequency discrimination passage 42, and transmitted light enters center band atom frequency discrimination passage 43 through reflective mirror 463.
The receiving spectrum curve of left side band atom frequency discrimination passage 41 is a left side band atom frequency discrimination curve 4111 shown in Figure 5, and the intensity of the signal that obtains is represented the intensity of Rayleigh scattering echo spectrum left hand edge; The receiving spectrum curve of the right band atom frequency discrimination passage 42 is the right band atom frequency discrimination curve 4211 shown in Figure 5, the intensity of the signal strength expression Rayleigh scattering echo spectrum right hand edge that obtains; The receiving spectrum curve of center band atom frequency discrimination passage 43 is a center band atom frequency discrimination curve 4311 shown in Figure 5, and the total intensity of the signal strength expression Rayleigh scattering echo spectrum that obtains has comprised the density information of atmosphere.
Left side band atom frequency discrimination curve 4111, the right band atom frequency discrimination curve 4211 and center band atom frequency discrimination curve 4311 and as the shape of the sodium atom absorption curve 1301 of laser instrument 11 frequency stabilization benchmark, all be that the transition energy level of sodium atom is determined in being steeped by each atom, therefore the frequency location of above-mentioned each curve relation is fixing, little to the wind-warm syndrome detecting error, working stability is reliable.
As shown in Figure 5, when the temperature of some molecules in high-altitude is elevated to T2 by T1, the amplitude of its back scattered Rayleigh echo spectrum reduces, width increases, echo light gross energy is constant, at this moment, it is constant that the Rayleigh echo light that returns from this point scattering enters the luminous energy of center band atom frequency discrimination passage 43, and the electrical signal intensity I3 that 313 pairs of these points of the 3rd photomultiplier are surveyed are constant; But the luminous energy that enters left side band atom frequency discrimination passage 41 and the right band atom frequency discrimination passage 42 from the Rayleigh echo light that this point scattering returns all can increase, and electrical signal intensity I1 and I2 that 213 pairs of these points of first photomultiplier 113 and second photomultiplier are surveyed also can increase.The ratio that calculates I1 and I2 sum and I3 obtains the temperature of this point.
As shown in Figure 6, when colony's speed of some molecules in high-altitude is elevated to υ 2 by υ 1, the amplitude of its back scattered Rayleigh echo spectrum is constant, spectrum is constant to right translation, echo light gross energy, at this moment, the luminous energy that enters center band atom frequency discrimination passage 43 from the Rayleigh echo light of this point scattering is constant, and the electrical signal intensity I3 that 313 pairs of these points of the 3rd photomultiplier are surveyed are constant; But the luminous energy that enters left side band atom frequency discrimination passage 41 from the Rayleigh echo light of this point scattering reduces, and the electrical signal intensity I1 that 113 pairs of this point of first photomultiplier are surveyed reduces; Simultaneously, from the luminous energy increase that the Rayleigh echo light of this point scattering enters the right band atom frequency discrimination passage 42, the electrical signal intensity I2 that 213 pairs of these points of second photomultiplier are surveyed can increase.Calculate I1 and the difference of I2 and the ratio of I3, the size of absolute value is represented the size of this wind speed, and sign is represented the direction of this wind field.
Data acquisition and processing:
Data acquisition and processing unit (5) carry out data acquisition to three road signal I1, I2 and the I3 of above-mentioned three passages output, and handle and calculate density, temperature and the wind field that obtains atmosphere, and its method is the known general knowledge of those skilled in the art.
Claims (3)
1. high-altitude air Rayleigh scattering wind-warm syndrome laser radar is by laser emission element (1), receiving telescope (2), optical fiber (3), frequency discrimination unit (4) and data acquisition and processing unit (5) are formed, it is characterized in that, the axis of the laser outbound course of laser emission element (1) and receiving telescope (2) is all vertical with surface level to be placed, the receiving end of optical fiber (3) is positioned on the focus of receiving telescope (2) and is coaxial with receiving telescope (2), output terminal places on the focus of frequency discrimination unit (4) convex lens (44) and is coaxial with convex lens (44), three photomultipliers (113 of frequency discrimination unit (4), 213 and 313) output terminal is connected respectively to the input end of data acquisition and processing unit (5);
Wherein, the structure of laser emission element (1) is: the placement of laser instrument (11) makes the transmit direction of laser vertical with surface level, first light splitting piece (12) places laser instrument (11) output light path and is miter angle with light path, in the reflected light path of first light splitting piece (12), place the 6th atom bubble (13) and photodetector (14) successively, the output terminal of photodetector (14) is connected to the input end of frequency stabilization controller (15), and the output terminal of frequency stabilization controller (15) is connected to the frequency stabilization control end of laser instrument (11);
Wherein, frequency discrimination unit (4) are made up of convex lens (44), optical filter (45), spectrum groupware (46), left side band atom frequency discrimination passage (41), the right band atom frequency discrimination passage (42) and center band atom frequency discrimination passage (43); The 4th polarizing prism (461) of convex lens (44), optical filter (45) and spectrum groupware (46) is arranged in co-axial alignment successively, spectrum groupware (46) is made up of the 4th polarizing prism (461), second light splitting piece (462) and catoptron (463), transmitted light direction at the 4th polarizing prism (461) is arranged in order second light splitting piece (462) and catoptron (463), and second light splitting piece (462) and catoptron (463) are miter angle with the transmitted light direction of the 4th polarizing prism (461); Refract light direction at the 4th polarizing prism (461) is placed left side band atom frequency discrimination passage (41) over against refract light, reflected light direction at second light splitting piece (462) is placed the right band atom frequency discrimination passage (42) over against reflected light, places center band atom frequency discrimination passage (43) in the reflected light direction of catoptron (463) over against reflected light;
The structure of left side band atom frequency discrimination passage (41) is: first magnet (102), first atom bubble (104), second magnet (105), first polarizing prism (106), first quarter wave plate (107), the 3rd magnet (109), second atom bubble (111), the 4th magnet (112) and first photomultiplier (113) be arranged in co-axial alignment successively; The polarization direction of first polarizing prism (106) is vertical with the polarization direction of the 4th polarizing prism (461) refract light; Dress sodium atom in first atom bubble (104), place the centre of cylinder type first thermostatic tube (103), thermostat temperature is 170 degree Celsius, first magnet (102), second magnet (105) are circular ring type, place the two ends of first thermostatic tube (103), in the magnetic field that first atom bubble (104) locates to produce 200Gs, first magnetic shielding cylinder (101) is wrapped in the outside of first magnet (102), second magnet (105) and first thermostatic tube (103); Dress sodium atom in second atom bubble (111), place the centre of cylinder type second thermostatic tube (110), thermostat temperature is 170 degree Celsius, the 3rd magnet (109), the 4th magnet (112) are circular ring type, place the two ends of second thermostatic tube (110), in the magnetic field that second atom bubble (111) locates to produce 200Gs, second magnetic shielding cylinder (108) is wrapped in the outside of the 3rd magnet (109), the 4th magnet (112) and second thermostatic tube (110), and the polarization direction of the crystalline axis direction of first wave plate (107) and first polarizing prism (106) is positive miter angle;
The structure of the right band atom frequency discrimination passage (42) and the difference of left side band atom frequency discrimination passage (41) only are that the polarization direction of second polarizing prism (206) is vertical with second light splitting piece (462) polarization of reflected light direction; The polarization direction of the crystalline axis direction of second quarter wave plate (207) and second polarizing prism (206) is negative miter angle;
The structure of center band atom frequency discrimination passage (43) is: the 9th magnet (302), Wuyuan Zi Pao (304), the tenth magnet (305), the 3rd polarizing prism (306) and the 3rd photomultiplier (313) be arranged in co-axial alignment successively; The polarization direction of the 3rd polarizing prism (306) is vertical with catoptron (463) polarization of reflected light direction; Dress sodium atom in the Wuyuan Zi Pao (304), place the centre of cylinder type the 5th thermostatic tube (303), thermostat temperature is 170 degree Celsius, the 9th magnet (302), the tenth magnet (305) are circular ring type, place the two ends of the 5th thermostatic tube (303), in the magnetic field that Wuyuan Zi Pao (304) locates to produce 2200Gs, the 5th magnetic shielding cylinder (301) is wrapped in the outside of the 9th magnet (302), the tenth magnet (305) and the 5th thermostatic tube (303).
2. high-altitude air Rayleigh scattering wind-warm syndrome laser radar according to claim 1, it is characterized in that, the all interior dress K of described each atom bubble atom, the thermostat temperature of each thermostatic tube is 150 degree Celsius, magnet in left side band atom frequency discrimination passage (41) and the right band atom frequency discrimination passage (42) produces the magnetic field of 150Gs at atom bubble place, the magnet in the center band atom frequency discrimination passage (43) produces the magnetic field of 1500Gs at atom bubble place.
3. high-altitude air Rayleigh scattering wind-warm syndrome laser radar according to claim 1, it is characterized in that, the all interior dress Li of described each atom bubble atom, the thermostat temperature of each thermostatic tube is 300 degree Celsius, magnet in left side band atom frequency discrimination passage (41) and the right band atom frequency discrimination passage (42) produces the magnetic field of 350Gs at atom bubble place, the magnet in the center band atom frequency discrimination passage (43) produces the magnetic field of 3500Gs at atom bubble place.
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101788674B (en) * | 2009-12-25 | 2012-07-25 | 中国科学院武汉物理与数学研究所 | High-altitude air Rayleigh scattering wind-warm probe laser radar |
| CN106526615A (en) * | 2016-10-26 | 2017-03-22 | 中国科学院武汉物理与数学研究所 | Atmospheric Mie-Rayleigh scattering wind-measurement laser radar and inversion method |
| CN107209265A (en) * | 2015-03-20 | 2017-09-26 | 摸索科技有限公司 | light detection and ranging device |
| CN109828261A (en) * | 2019-04-01 | 2019-05-31 | 南昌航空大学 | The detection method and device of atmospheric laser radar |
-
2009
- 2009-12-25 CN CN2009203534927U patent/CN201583662U/en not_active Expired - Lifetime
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101788674B (en) * | 2009-12-25 | 2012-07-25 | 中国科学院武汉物理与数学研究所 | High-altitude air Rayleigh scattering wind-warm probe laser radar |
| CN107209265A (en) * | 2015-03-20 | 2017-09-26 | 摸索科技有限公司 | light detection and ranging device |
| CN106526615A (en) * | 2016-10-26 | 2017-03-22 | 中国科学院武汉物理与数学研究所 | Atmospheric Mie-Rayleigh scattering wind-measurement laser radar and inversion method |
| CN106526615B (en) * | 2016-10-26 | 2019-04-26 | 中国科学院武汉物理与数学研究所 | Atmosphere rice-Rayleigh scattering anemometry laser radar and inversion method |
| CN109828261A (en) * | 2019-04-01 | 2019-05-31 | 南昌航空大学 | The detection method and device of atmospheric laser radar |
| CN109828261B (en) * | 2019-04-01 | 2022-02-01 | 南昌航空大学 | Detection method and device of atmospheric laser radar |
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