CN101034162A - Synthesis multifunctional middle and upper atmosphere exploration laser radar - Google Patents
Synthesis multifunctional middle and upper atmosphere exploration laser radar Download PDFInfo
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- CN101034162A CN101034162A CNA2007100515385A CN200710051538A CN101034162A CN 101034162 A CN101034162 A CN 101034162A CN A2007100515385 A CNA2007100515385 A CN A2007100515385A CN 200710051538 A CN200710051538 A CN 200710051538A CN 101034162 A CN101034162 A CN 101034162A
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Abstract
This invention discloses a synthetic multifunctional middle and upper atmosphere monitoring laser radar, which is made up of laser emission (1), optical receiving (2), signal detecting (3). This radar reasonably mixes together Rayleigh scattering laser radar, natrium fluorescent light laser radar and Rayleigh monitoring wind laser radar. The invention makes hardware be of multiple utilization, implements a laser radar monitors density, temperature, fluctuation and wind field of middle and upper atmosphere all the day. This laser radar utilizes key techniques such as: three direction fixed receiving and dispatching, optical fiber switch, single channel and borderline wind monitoring, launching laser and backward wave frequency discrimination frequency inter locked on molecule transition, atom filtration, complex filtration, twice multiple-frequency remnant light reuse, double optical fiber spectro-surface, square pulse dye laser atom steady frequency. The invention has advantages of stable and reliable working, high detection precision, high automatic, more monitoring parameter and long monitor time.
Description
Technical field:
The present invention relates to laser radar, relate in particular to the laser radar that centering upper atmosphere density, temperature, fluctuation and wind field multi-parameter comprehensive are surveyed.
Background technology:
The comprehensive survey of atmosphere multiparameter on the middle and senior level is significant at aspects such as space physics, atmospheric science, space environment forecasts.Laser radar can be realized quasi-continuous detection with its high-spatial and temporal resolution, high detection sensitivity, and does not have unique advantages such as atmospheric exploration blind area, has become the irreplaceable important means of the multiple parameter detection of centering upper atmosphere.At present to the detection of atmosphere on the middle and senior level more than the 20Km, utilize the laser radar of Rayleigh scattering mechanism can realize the isoparametric detection of density, temperature, fluctuation to about 20～80Km atmosphere, and to the detection of about 20～60Km wind field; Utilize the laser radar of resonance fluorescence of atom mechanism and enhancement mechanism (as high-altitude sodium layer, potassium layer etc.) can realize the laser radar of 80～110Km atomic density, fluctuation (low resolution) and wind field (high resolving power) is surveyed.
At present, realize normally adopting many dissimilar laser radars to move simultaneously to the method that above-mentioned multiple atmospheric parameter is surveyed, this obviously is not a kind of cost-effective method.In order to detect atmospheric parameter as much as possible with the least possible hardware device, the applicant is by technology such as twice surplus recovery usefulness of frequency multiplication, the beam split of two optical fiber focal plane, Rayleigh scattering and two kinds of mechanism of sodium fluorescence are organically incorporated (the patent No.: ZL00115964.X), realized the comprehensive survey (document: 601～606 pages of " Chinese laser " 2006 the 33rd the 5th phases of volume) of density, temperature and fluctuation to 20～110Km in the laser radar.After this, the applicant is after the Germany and the U.S., adopted the atom filter technology, pulsed dye laser sodium atom intelligence Frequency Stabilization Technique (number of patent application: 200510019816.X) in conjunction with applicant's proposition, realized also carrying out by day the round-the-clock Effect on Detecting (document: " Chinese science G " 2007,37 (1): 1～7) of atmospheric exploration on the middle and senior level.But the present invention still lacks the function that wind field is surveyed.
Realize that the detection of upper atmosphere wind field has great importance.The laser radar that wind field is surveyed is normally surveyed mechanism based on Doppler shift, utilizes Coherent Detection or direct detection mode, obtains the Doppler shift amount of echo light, extrapolates wind field thus.The Coherent Detection mode be suitable for aerosol load higher, be scattered back the stronger low latitude Mie scattering of the glistening light of waves; Directly detection mode on principle to strong, weak scattering echo light all can, both be suitable for the following low latitude Mie scattering of 20Km, be suitable for the above high-altitude Rayleigh scattering of 20Km again.Directly detection mode is divided rim detection type and two kinds of (documents: APPLIED OPTICS of ring grain imaging-type again, Vol.38, No.27, p5859-5866,1999), the former is as the laser radar of U.S.'s Goddard space research center laser radar and French OHP, the latter such as Michigan university laser radar.For obtaining the wind field vector in space, need to survey the wind field component of three directions, two kinds of methods are arranged usually: the one, adopt a cover laser beam emitting device, three directions are emission in turn, three fixing receptions of telescope; The 2nd, adopt a cover Laser emission, a cover telescope receives, and receives and dispatches synchronous deflection.Timesharing is surveyed the wind speed component in turn to three directions, and is synthetic through vector, obtains wind vector.These two kinds of method equipment are few, but technical sophistication, particularly the operation easier of system's deflection is big, and detection direction is long switching time, and the high-altitude transmitting-receiving is the coupling difficulty accurately, causes operational reliability not high.
Summary of the invention:
The present invention proposes a kind of comprehensive multi-functional atmospheric exploration laser radar on the middle and senior level, Rayleigh lidar, sodium fluorescence laser radar and Rayleight windfinding laser radar are organically blent, adopt two Nd:YAG laser instruments and a dye laser, produce dual wavelength, four light beam Frequency Stabilized Lasers, press three direction fixed transmission and receptions: vertical direction adopts 532nm and 589nm two bundle Laser emission and receptions, realizes Rayleigh scattering, vertically wind field and sodium fluorescence detection; Two vergence directions all adopt a branch of 532nm Laser emission and reception, realize that the wind field of vergence direction is surveyed; Three direction echo gloss with fiber switch switch, frequency discrimination in turn, obtain the upper-level winds field information.Realized the detection of centering upper atmosphere density, temperature, fluctuation and wind field.
In order to achieve the above object, the present invention adopts following technical scheme:
The present invention is received by Laser emission, optics and input three parts are formed.Adopt two seeds to inject the Nd:YAG laser instrument of frequency stabilization, obtain four bundle 532nm laser through twice frequency multiplication respectively, wherein a branch ofly be converted to 589nm laser through dye laser, then with this 589nm laser and other three beams 532nm laser, divide the emission of three directions: vertical direction is launched a branch of 532nm and a branch of 589nm laser, receive and two optical fiber focal plane beam split through primary telescope, respectively 532nm and 589nm echo light are sent into Rayleigh scattering sense channel and sodium fluorescence sense channel, obtain to contain the data of density, temperature, fluctuation information; Two vergence directions are launched a branch of 532nm laser respectively, receive through oblique telescope, send into Rayleigh wind field sense channel in turn together with the 532nm echo optical signal of vertical direction, obtain the tripartite aweather data of field component information.Survey when realizing the density, fluctuation, temperature of centering upper atmosphere and wind field.Concrete division is as follows:
The Laser emission part:
The lasing light emitter of Laser emission part adopts two seeds to inject the Nd:YAG laser instrument of frequency stabilization, the laser of the 1064nm of two laser instruments output is respectively through the method (patent: ZL 00115964.X) obtain four bundle 532nm laser of the twice surplus recovery usefulness of frequency multiplication, wherein a branch of 532nm laser pump (ing) dye laser, produce 589nm laser, then with this 589nm laser and other three beams 532nm laser, divide the emission of three directions: vertical direction emission 532nm and 589nm dual-wavelength laser, two light beams and primary telescope optical axis are 1～5 ° of angle and are symmetrically distributed; Two vergence directions are launched a branch of 532nm laser respectively, and its direction is 30～50 ° of angles with vertical 532nm light beam, and the surface level of two oblique light beams projects into 90 ° of angles.
The pulsed dye laser of above-mentioned generation 589nm laser adopt sodium atom intelligence Frequency Stabilization Technique (patent No.: 200510019816.x), with the 589nm laser frequency lock on the resonance line of sodium atom; 532nm laser adopts the continuous wave seed of iodine molecule frequency stabilization to inject Frequency Stabilization Technique (document: Correctedand calibrated I2 absorption model at frequency-doubled Nd:YAG laserwavelengths, Applied Optics, 1997,36 (27): 6729～6738), with three beams 532nm laser frequency lock on the resonance line of iodine molecule.
The optics receiving unit:
The optics receiving unit is made up of three receiving telescopes and four optical fiber.The primary telescope optical axis is placed a root receiving fiber respectively at the focus place, far field of two echo light straight up, receives the 589nm and the 532nm echo optical signal of vertical direction respectively; Two oblique telescope optic axis are parallel or coaxial with oblique emission of lasering beam, respectively place a root receiving fiber at two oblique telescopical focus places, receive the 532nm echo optical signal of two vergence directions respectively.Three receiving telescopes constitute fixedly receive-transmit system of three directions with three beams 532nm laser beam, in order to survey three direction wind field information.With cover Laser emission and a reception, receive and dispatch the mode that synchronous deflection, three directions surveys in turn and compare easy operating, stable and reliable operation.
The input part:
The signal detecting part branch comprises fiber switch, computing machine, sodium fluorescence sense channel, Rayleigh wind field sense channel and Rayleigh scattering sense channel.
Sodium fluorescence detects: the echo optical signal of vertical direction 589nm is sent into the sodium fluorescence sense channel through optical fiber, through sodium atom optical filtering and photodetection etc., obtain the laser radar echo signal of 80～110Km high-altitude sodium layer resonance fluorescence, and the laser radar echo signal of 20～60Km upper atmosphere Rayleigh scattering, these signals have comprised density, temperature and the fluctuation information of 20～60Km upper atmosphere, and 80～110Km high-altitude sodium layer relative density and fluctuation information.
Since the method that pulsed dye laser adopts intelligent frequency stabilization with the 589nm laser lock-on on the resonance line of sodium atom, and in the sodium fluorescence sense channel, adopted the sodium atom light filter of super narrow bandwidth, both are operated on the same transition spectral line of same atoms, so both have frequency invariance.And narrow about 2～3 magnitudes of the optical filtering bandwidth ratio interference light filter of sodium atom light filter have high performance bias light to suppress ability, make the sodium fluorescence sense channel can be implemented in the round-the-clock Effect on Detecting that daytime also can single photon detection.
The Rayleigh wind field detects: with the 532nm echo optical signal of three directions, switch through the fiber switch timesharing, send into Rayleigh wind field sense channel, through composite filter, echo light frequency discrimination and photodetection etc., obtain the laser radar echo signal of three directions, these signals have comprised the wind field information of 20～60Km upper atmosphere.
Adopt fiber switch to realize that three direction echo light timesharing detect: fiber switch has three tunnel input two-way outputs, the 532nm echo optical signal of three directions is respectively through optical fiber input optical fibre switch, and two optical fiber of output connect Rayleigh wind field sense channel and Rayleigh scattering sense channel respectively.Fiber switch switches the 532nm echo optical signal of three directions respectively in turn, the timesharing of three echo light is connected to Rayleigh wind field sense channel, can reach the magnitude of second switching time, on the time scale of Changes in weather, obtaining of three direction echo frequency displacement information reaches simultaneously accurate.This optical fiber switching mode is compared with three directions rotation receive mode, and the signal switch speed is fast, stable and reliable operation.With the method for the shared cover wind field sense channel of three road echo optical signals, wind field detects high conformity, saves hardware resource.
The stability and the consistance of emission laser frequency and reception echo light frequency discrimination etalon frequency will directly influence the precision that wind field is measured, the mode that emission laser frequency of the present invention adopts iodine molecule frequency stabilization seed to inject, the 532nm laser lock-on of emission on the resonance line of iodine molecule, has been guaranteed the frequency stability of emission laser; Receive echo light frequency discrimination etalon and also take the frequency stabilization measure: with emission 532nm laser is frequency standard, adopts the method for difference frequency locking, and the transmission peaks of frequency discrimination etalon is locked on the hypotenuse of no Doppler shift Rayleigh echo light spectrum.So both guaranteed the frequency stability of frequency discrimination etalon, and guaranteed emission laser and the relative uniformity that receives the frequency discrimination frequency again, the system that makes has higher wind field measuring accuracy.
Aspect echo light frequency discrimination, the present invention adopts etalon single edges frequency detection mode: the frequency discrimination etalon of locking frequency position, transmitted light intensity will change along with the variation of echo light Doppler shift, obtain to have the electric signal of wind field information through opto-electronic conversion.The mode of this single edges frequency discrimination is compared with the dual edge frequency discrimination, simple in structure, saving hardware resource.
In addition, in Rayleigh wind field sense channel kind, also adopt composite filter technology to increase detectivity on its on daytime.Composite filter is the mode (document: APPLIED OPTICS that adopts narrow band pass filter to combine with the F-P etalon, Vol.22, No.23, p3716-3724,1983), with emission 532nm laser is frequency reference, and the transmission peaks of composite filter device is locked on the laser line, has guaranteed the consistance of composite filter frequency and emission laser frequency.Total transmission bandwidth of composite filter device is the bandwidth of a transmission peaks of etalon, than narrow about 2 magnitudes of simple use interference filter, can effectively suppress the interference of bias light like this, reaches also to carry out the round-the-clock Effect on Detecting that photon receives detection daytime.
Rayleigh scattering detects: the 532nm Rayleigh echo optical signal that vertical direction receives has only portion of time to be utilized by the wind field sense channel, can send into the Rayleigh scattering sense channel excess time through optical fiber, through composite filter and photodetection etc., obtain the Rayleigh lidar echoed signal of 20～80Km upper atmosphere, this signal contains density, temperature and the fluctuation information of 20～80Km upper atmosphere.Also adopt composite filter technology in this passage: the Rayleigh scattering sense channel, is locked in composite filter device transmission peaks on this laser frequency as frequency standard with its 532nm laser that receives, and realizes the arrowband composite filter of self-adaptation frequency stabilization.Also can carry out the round-the-clock Effect on Detecting that photon receives detection daytime to reach.
Computing machine: computer realization is obtained and information processing the control of total system, data: the one, send synchronizing signal, and trigger two laser instruments and produce laser pulses, meanwhile trigger three and receive sense channels and carry out synchronous data collection; The 2nd, the data that Rayleigh scattering sense channel, sodium fluorescence sense channel and Rayleigh wind field sense channel are gathered are stored and inverting, finally obtain density, temperature, fluctuation and the wind field of atmosphere on the middle and senior level.
From above-mentioned three laser radar echo data that sense channel obtained, be finally inversed by the method for density, temperature, fluctuation and the wind field of atmosphere, for those of ordinary skills known.
Advantage of the present invention and effect:
A kind of comprehensive multi-functional atmospheric exploration laser radar on the middle and senior level that the present invention proposes, three kinds of laser radars are organically blent, only with two solid state lasers and a dye laser, just realize except carrying out to carry out wind field and 80～110Km sodium layer relative density and the fluctuation detection of density, temperature, fluctuation and the 20～40Km of 20～50Km upper atmosphere by day the wind field and 80～110Km sodium layer relative density and fluctuation detection of density, temperature, fluctuation and 20～60Km of 20～80Km upper atmosphere at night.Hardware resource fully obtains comprehensive utilization; Adopt fiber switch that laser radar echo halo stream is switched, switching mode is simple, the operational reliability height, and switch speed is fast, reaches a second level standard and surveys simultaneously; Adopt a cover frequency displacement detection system that the timesharing of three-dimensional echo is detected, detect high conformity, save hardware resource; Lock emission laser and frequency discrimination etalon simultaneously with iodine molecule, and adopt the single edges frequency discrimination technology, improved Rayleigh wind field measuring accuracy effectively with simple structure; Composite filter is filtered and combines with the sodium atom laser frequency stabilization with iodine molecule laser frequency stabilization, sodium atom, make system not only have stronger bias light inhibition ability but also have stronger transmitting-receiving frequency consistance; Emitting laser, composite filter device and frequency discrimination etalon have all adopted the Automatic Frequency lock-in techniques, and system moves the automaticity height, long-time stability are good; Reach multiple parameters effect simultaneously long-time, stable, that round-the-clock is surveyed.
Description of drawings:
Fig. 1 is a kind of comprehensive multi-functional atmospheric exploration laser radar structural representation on the middle and senior level.
Wherein: 1 Laser emission part, 10 first laser beam emitting devices, 11 second laser beam emitting devices, 101 first seeds inject stabilized Nd: the YAG laser instrument, 102 first frequency multipliers, 103 first optical splitters, 104 second frequency multipliers, 105 first prisms, 111 second seeds inject stabilized Nd: the YAG laser instrument, 112 frequency triplers, 113 second optical splitters, 114 quadruplers, 115 atomic frequency-stabilized laser pulsed dye lasers, 116 second prisms, 231 first laser beam, 232 second laser beam, 233 the 3rd laser beam, 234 the 4th laser beam;
2 optics receiving units, 201 first oblique telescopes, 202 second oblique telescopes, 203 primary telescopes, 211 first optical fiber, 212 second optical fiber, 213 the 3rd optical fiber, 214 the 4th optical fiber, 215 the 5th optical fiber;
3 input part, 301 computing machines, 302 fiber switchs, 303 sodium fluorescence sense channels, 304 Rayleigh scattering sense channels, 305 Rayleigh wind field sense channels, 316 six fiberses, 317 the 7th optical fiber.
Embodiment:
Comprehensive multi-functional atmospheric exploration laser radar on the middle and senior level is made up of Laser emission part 1, optics receiving unit 2 and input part 3.
Laser emission part 1:
First laser beam emitting device 10 injects stabilized Nd by first seed: YAG laser instrument 101, first frequency multiplier 102, first optical splitter 103, second frequency multiplier 104 and first prism 105 are formed, and are arranged in order in this order; First seed injects stabilized Nd: the 1064nm laser of YAG laser instrument 101 outputs, produce 532nm laser through first frequency multiplier 102, by first optical splitter 103 532nm laser and remaining 1064nm laser are pressed the wavelength beam split, 532nm first laser beam 231 of reflection is launched, transmit direction is parallel with the optical axis of the first oblique telescope 201, produce 532nm laser from the 1064nm laser of first optical splitter, 103 transmissions through second frequency multiplier 104, after 105 refractions of first prism, the 3rd laser beam 233 of 532nm is launched, and the optical axis of transmit direction and primary telescope 203 is 1 °～5 ° angles.
Second laser beam emitting device 11 injects stabilized Nd by second seed: YAG laser instrument 111, frequency tripler 112, second optical splitter 113, quadrupler 114, atomic frequency-stabilized laser pulsed dye laser 115 and second prism 116 are formed, and are arranged in order in this order; Second seed injects stabilized Nd: the 1064nm laser of YAG laser instrument 111 outputs, produce 532nm laser through frequency tripler 112, by second optical splitter 113 532nm laser and remaining 1064nm laser are pressed the wavelength beam split, 532nm second laser beam 232 of reflection is launched, transmit direction is parallel with the optical axis of the second oblique telescope 202, produce 532nm laser from the 1064nm laser of second optical splitter, 113 transmissions through quadrupler 114, incide atomic frequency-stabilized laser pulsed dye laser 115, produce the 589nm Frequency Stabilized Lasers, through 116 refractions of second prism, the 4th laser beam 234 of 589nm is launched, and its transmit direction is with respect to the optical axis and the 3rd laser beam 233 symmetries of primary telescope 203.
Two above-mentioned seeds inject stabilized Nd: YAG laser instrument 101 and 111, with the iodine molecule spectral line as the frequency stabilization benchmark, adopt the continuous wave seed to inject the method (document: Applied Optics of frequency stabilization, 1997,36 (27): 6729～6738), with three beams 532nm laser lock-on on the resonance line of iodine molecule; Above-mentioned atomic frequency-stabilized laser pulsed dye laser 115 as the frequency stabilization benchmark, adopts the method (patent No.: 200510019816.X), its output frequency is locked on the resonance line of sodium atom of intelligent frequency stabilization with the sodium atom spectral line.
Optics receiving unit 2:
One end of first optical fiber 211 is placed the focus place of the first oblique telescope 201, one end of second optical fiber 212 is placed the focus place of the second oblique telescope 202, one end of the 3rd optical fiber 213 is placed 532nm the 3rd laser beam 233 echo light at focus place, the far field of primary telescope 203, and the other end of above-mentioned three optical fiber connects the input end of fiber switch 302; One end of the 4th optical fiber 214 is placed on 589nm the 4th laser beam 234 echo light at focus place, the far field of primary telescope 203, and the other end connects the input end of sodium fluorescence sense channel 303; The optical axis of above-mentioned optical fiber one end is all parallel with the telescope optic axis that it is placed, and receives the far field echo light of emission of lasering beam respectively.
Input:
Input part 3 is made up of computing machine 301, fiber switch 302, sodium fluorescence sense channel 303, Rayleigh scattering sense channel 304 and Rayleigh wind field sense channel 305.
Sodium fluorescence detects: the 4th optical fiber 214 is connected to sodium fluorescence sense channel 303 with the 589nm echo optical signal that primary telescope 203 receives.In sodium fluorescence sense channel 303,589nm echo light is through light beam collimation lens, spike interference filter, sodium atom light filter, photodetector and data acquisition unit, obtain the laser radar echo signal of 80～110Km high-altitude sodium layer resonance fluorescence, and the laser radar echo signal of 20～60Km upper atmosphere Rayleigh scattering, send computing machine 301 to by data line.Wherein, the sodium fluorescence detection method is that those of ordinary skills are known.
Super narrow bandwidth sodium atom light filter in the sodium fluorescence sense channel 303, combine with the sodium atom spectral line frequency stabilization of atomic frequency-stabilized laser pulsed dye laser 115, make on the one hand to transmit and receive laser frequency and be based upon on the identical atomic spectral line, realized the consistance of transmitting-receiving frequency; Utilize the super narrow bandwidth characteristic of sodium atom light filter on the other hand, realized also carrying out daytime the round-the-clock detectivity of atmospheric exploration on the middle and senior level.
The Rayleigh wind field detects: fiber switch 302 is connected to six fibers 316 in turn with first optical fiber 211, second optical fiber 212 and the 3rd optical fiber 213, and the wind field that is input to Rayleigh wind field sense channel 305 again detects input end.
In Rayleigh wind field sense channel 305,532nm echo light is through light beam collimation lens, composite filter device, frequency discrimination etalon, photodetector and data acquisition unit, obtain the wind field laser radar echo signal of three direction 20～60Km, send computing machine 301 to by data line.Wherein, the changing method of Rayleigh wind field detection method and fiber switch is that those of ordinary skills are known.
One end of the 5th optical fiber 215 is tiltedly to incident light one side of first prism 105, collect the 532nm emission laser of a part of scattering, the other end is tiltedly to the receiving plane of primary telescope 203, the 532nm emission laser of scattering is switched by direct reflection, 213 conduction of the 3rd optical fiber and fiber switch 302, enter Rayleigh wind field sense channel 305,, as frequency standard the transmission peaks of composite filter device is locked on this laser frequency with this 532nm laser, realizes adaptive arrowband composite filter; The frequency discrimination etalon as frequency standard, adopts the method for difference frequency locking with this 532nm laser, the transmission peaks of frequency discrimination etalon is locked on the hypotenuse of Rayleigh echo light spectrum of no Doppler shift, with realization single edges frequency discrimination.Wherein, the frequency locking method of composite filter device and frequency discrimination etalon is that those of ordinary skills are known.
Rayleigh scattering detects: the 3rd optical fiber 213 is not when being communicated to six fibers 316, by fiber switch 302 it is communicated to the 7th optical fiber 317, the 532nm return laser beam of vertical direction is connected to the detection input end of Rayleigh scattering sense channel 304, through light beam collimation lens, composite filter device, photodetector and data acquisition unit, obtain the Rayleigh lidar echoed signal of 20～80Km of vertical direction, send computing machine 301 to by data line.Wherein, the Rayleigh scattering detection method is that those of ordinary skills are known.
Rayleigh scattering sense channel 304, is locked in its composite filter device transmission peaks on the laser frequency as frequency standard with its 532nm laser that receives, and realizes the arrowband composite filter of self-adaptation frequency stabilization.Wherein, the frequency locking method of composite filter device is that those of ordinary skills are known.
The synchronizing signal of computing machine output is connected to first seed and injects stabilized Nd: YAG laser instrument 101, second seed inject stabilized Nd: YAG laser instrument 111, sodium fluorescence sense channel 303, Rayleigh wind field sense channel 305 and Rayleigh scattering sense channel 304, and realize emission laser and receive carrying out synchronously of detecting.
Being finally inversed by the method for density, temperature, fluctuation and the wind field of atmosphere from above-mentioned three laser radar echo data that sense channel obtained, is that those of ordinary skills are known.
One or two or three in three receiving telescopes among the embodiment 1 is adopted the combined type receiving telescope.
Embodiment 3
The atomic light filter of the sodium fluorescence passage 303 among embodiment 1 or the embodiment 2 adopts interference light filter or birefringent filter.
Embodiment 4
The Rayleigh scattering passage 304 among embodiment 1 or the embodiment 2 and the composite filter device of Rayleight windfinding passage 305 adopt interference light filter or birefringent filter.
Claims (8)
1, a kind of comprehensive multi-functional atmospheric exploration laser radar on the middle and senior level, this laser radar is made up of Laser emission part (1), optics receiving unit (2), input part (3) three parts, it is characterized in that Laser emission part (1) is made up of first laser beam emitting device (10) and second laser beam emitting device (11) two parts; First laser beam emitting device (10) injects stabilized Nd by first seed: YAG laser instrument (101), first frequency multiplier (102), first optical splitter (103), second frequency multiplier (104) and first prism (105) are formed, and are arranged in order in this order; First laser beam (231) of first optical splitter (103) reflection is parallel with the optical axis of the first oblique telescope (201), and the 3rd laser beam (233) of first prism (105) refraction is 1 °～5 ° angles with the optical axis of primary telescope (203); Second laser beam emitting device (11) injects stabilized Nd by second seed: YAG laser instrument (111), frequency tripler (112), second optical splitter (113), quadrupler (114), atomic frequency-stabilized laser pulsed dye laser (115) and second prism (116) are formed, and are arranged in order in this order; Second laser beam (232) of second optical splitter (113) reflection is parallel with the optical axis of the second oblique telescope (202), and the 4th laser beam (234) direction of second prism (116) refraction is with respect to the optical axis and the 3rd laser beam (233) symmetry of primary telescope (203);
Optics receiving unit (2) is made up of three receiving telescopes and four optical fiber; The optical axis of primary telescope (203) straight up, the first oblique telescope (201) all is 30 °～50 ° identical angles with primary telescope (203) optical axis with second oblique telescope (202) optical axis, and the surface level of two oblique telescope optic axis projects into 90 ° of angles; One end of first optical fiber (211) is positioned over the focus place of the first oblique telescope (201), one end of second optical fiber (212) is positioned over the focus place of the second oblique telescope (202), one end of the 3rd optical fiber (213) is positioned over the far field focus place of the 3rd laser beam (233) echo light at primary telescope (203), and the other end of above-mentioned three optical fiber connects the input end of fiber switch (302); One end of the 4th optical fiber (214) is positioned over the far field focus place of the 4th laser beam (234) echo light at primary telescope (203), and the other end connects the input end of sodium fluorescence sense channel (303);
Input part (3) is made up of computing machine (301), fiber switch (302), sodium fluorescence sense channel (303), Rayleigh scattering sense channel (304) and Rayleigh wind field sense channel (305);
The sodium fluorescence echoed signal that sodium fluorescence sense channel (303) obtains sends computing machine (301) to by data line; Fiber switch (302) is connected to six fibers (316) in turn with first optical fiber (211), second optical fiber (212) and the 3rd optical fiber (213), be input to the input end of Rayleigh wind field sense channel (305) again, the output signal of Rayleigh wind field sense channel (305) sends computing machine (301) to by data line; The 3rd optical fiber (213) is not when being communicated to six fibers (316), be communicated to the 7th optical fiber (317), be input to the input end of Rayleigh scattering sense channel (304) again, the output signal of Rayleigh scattering sense channel (304) sends computing machine (301) to by data line;
The synchronizing signal of computing machine output is connected to first seed and injects stabilized Nd: YAG laser instrument (101), second seed inject stabilized Nd: YAG laser instrument (111), sodium fluorescence sense channel (303), Rayleigh wind field sense channel (305) and Rayleigh scattering sense channel (304).
2, a kind of comprehensive multi-functional atmospheric exploration laser radar on the middle and senior level according to claim 1 is characterized in that, an end of the 5th optical fiber (215) is tiltedly to incident light one side of first prism (105), and the other end is tiltedly to the receiving plane of primary telescope (203).
3, a kind of comprehensive multi-functional atmospheric exploration laser radar on the middle and senior level according to claim 2, it is characterized in that described first seed injects stabilized Nd: the YAG laser instrument (101) and second seed inject stabilized Nd: YAG laser instrument (111) adopts the frequency of iodine molecule frequency stabilization seed injection locking 532nm laser; The transmission peaks of composite filter device is locked on the emission 532nm laser frequency, and the transmission peaks of frequency discrimination etalon is locked on the hypotenuse of Rayleigh echo light spectrum of no Doppler shift.
4, according to claim 1 or the described a kind of comprehensive multi-functional atmospheric exploration laser radar on the middle and senior level of claim 3, it is characterized in that, the 589nm laser frequency lock of described atomic frequency-stabilized laser pulsed dye laser (115) output is on the resonance line of sodium atom, and the light filter of sodium fluorescence sense channel (303) adopts the sodium atom light filter.
5, a kind of comprehensive multi-functional atmospheric exploration laser radar on the middle and senior level according to claim 1 is characterized in that, one or two or three in three receiving telescopes of described optics receiving unit (2) is adopted the combined type receiving telescope.
6, according to claim 1 or the described a kind of comprehensive multi-functional atmospheric exploration laser radar on the middle and senior level of claim 3, it is characterized in that the composite filter device in described Rayleigh scattering sense channel (304) and the Rayleigh wind field sense channel (305) adopts interference light filter or birefringent filter.
7, a kind of comprehensive multi-functional atmospheric exploration laser radar on the middle and senior level according to claim 1 is characterized in that, the atomic light filter of described sodium fluorescence sense channel (303) adopts interference light filter or birefringent filter.
8, a kind of comprehensive multi-functional atmospheric exploration laser radar on the middle and senior level according to claim 4 is characterized in that, the atomic light filter of described sodium fluorescence sense channel (303) adopts interference light filter or birefringent filter.
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