CN103869301A - Coherent anemometry laser radar pulse signal transmitting system - Google Patents
Coherent anemometry laser radar pulse signal transmitting system Download PDFInfo
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- CN103869301A CN103869301A CN201410119758.7A CN201410119758A CN103869301A CN 103869301 A CN103869301 A CN 103869301A CN 201410119758 A CN201410119758 A CN 201410119758A CN 103869301 A CN103869301 A CN 103869301A
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- laser
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- mode polarization
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
- G01S7/00—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00
- G01S7/48—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00 of systems according to group G01S17/00
- G01S7/483—Details of pulse systems
- G01S7/484—Transmitters
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
- G01S17/00—Systems using the reflection or reradiation of electromagnetic waves other than radio waves, e.g. lidar systems
- G01S17/88—Lidar systems specially adapted for specific applications
- G01S17/95—Lidar systems specially adapted for specific applications for meteorological use
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A90/00—Technologies having an indirect contribution to adaptation to climate change
- Y02A90/10—Information and communication technologies [ICT] supporting adaptation to climate change, e.g. for weather forecasting or climate simulation
Abstract
A coherent anemometry laser radar pulse signal transmitting system comprises a fiber laser, a first single-mode polarization maintaining optical fiber, an optical fiber online type polarizer, a second single-mode polarization maintaining optical fiber, a two-micron acousto-optic frequency shifter, a third single-mode polarization maintaining optical fiber, a chopper and a fourth single-mode polarization maintaining optical fiber. Laser signals pass through a two-micron optical fiber laser, the first single-mode polarization maintaining optical fiber, the optical fiber online type polarizer and the two-micron acousto-optic frequency shifter in sequence to generate two channels of laser signals, one channel of laser signals pass through the chopper and the fourth single-mode polarization maintaining optical fiber to form coherent anemometry laser radar pulse signals, and the other channel of laser signals pass through the third single-mode polarization maintaining optical fiber to form coherent anemometry laser radar reference local oscillator laser signals. The coherent anemometry laser radar pulse signal transmitting system can supply laser transmitting signals which are stable and adjustable in frequency and adjustable in pulse repeating frequency and pulse width for two-micron all-fiber coherent laser anemometry radar systems, and is simple in structure, stable in performance and easy to achieve in engineering.
Description
Technical field
The present invention relates to a kind of coherent wind laser radar pulse signal emission coefficient, can, for 2 mu m all-fiber coherent laser windfinding radar systems provide frequency stabilization and adjustable, pulse repetition rate and the adjustable Laser emission signal of pulsewidth, be mainly used in 2 mu m all-fiber coherent anemometry laser radar systems.
Background technology
Coherent laser windfinding radar is the first-selected laser remote sensing instrument that carries out global high precision and the measurement of high resolving power atmospheric wind, is widely used in the extreme weather fields of measurement such as substandard surface layers wind field, turbulent flow, cyclone, local thunderstorm.
Full optical fiber 2 μ m laser transmitting systems are with its compact conformation, laser technology maturation, laser wavelength eye-safe, feature is more and more subject to international favor in atmospheric window etc.Laser emission is the key components of coherent laser windfinding radar system, and its performance characteristics has directly determined the detectivity of system.Coherent laser windfinding radar system all adopts the Laser emission mode of pulse system at present, and it is high which has laser energy signal utilization factor, can realize long distance laser and measure object.
2 mu m coherent laser windfinding radar systems are based on aerocolloidal Michaelis back scattering mechanism, utilize the mutual interference of continuous local oscillator laser signal and pulse laser echoed signal to realize that Doppler's wind speed information extracts.Therefore the relevant coherence request that this coherent laser windfinding radar system transmits to laser pulse is very harsh.The main source that affects Laser emission signal coherency is exactly laser instrument emission coefficient, current Laser emission pulse mode is by place electric light or acousto-optic Q modulation switch in laserresonator, although this mode can realize single-frequency laser output, but regulative mode is single, require higher to laser instrument.Therefore be badly in need of a kind of external modulation mode simple to operation.
Summary of the invention
Technology of the present invention is dealt with problems and is: overcome the deficiencies in the prior art, a kind of coherent wind laser radar pulse signal emission coefficient is provided, can provides frequency stabilization and adjustable, pulse repetition rate and the adjustable Laser emission signal of pulsewidth for 2 mu m all-fiber coherent laser windfinding radar systems.
Technical solution of the present invention is: a kind of coherent wind laser radar signal emission coefficient, comprising: fiber laser, the first single-mode polarization maintaining fiber, the online polarizer of optical fiber, the second single-mode polarization maintaining fiber, 2 μ m acousto-optic frequency shifters, the 3rd single-mode polarization maintaining fiber, chopper and the 4th single-mode polarization maintaining fiber;
2 μ m acousto-optic frequency shifters comprise input port, 0 order diffraction port and 1 order diffraction port; Wherein 0 order diffraction port is that frequency keeps port, and 1 order diffraction port is frequency modulation (PFM) port;
Chopper comprises input port and external drive signaling interface;
Fiber laser is launched 2 μ m continuous laser signals, and by the first single-mode polarization maintaining fiber output, 2 μ m laser signals enter into the online polarizer of optical fiber, produce linearly polarized laser, then enter into 2 μ m acousto-optic frequency shifters by the input port of 2 μ m acousto-optic frequency shifters;
The voltage of regulating frequency modulation port, to 5.2V, reaches diffraction efficiency maximal value, from 0 order diffraction port and 1 order diffraction port output two-way laser signal;
The laser beam of 1 order diffraction port output is exported through the second single-mode polarization maintaining fiber, input port through chopper enters chopper, external drive signal enters chopper by external drive signaling interface, by regulating cycle and the dutycycle of external drive signal, produce needed laser radar signal, by the 4th polarization-maintaining single-mode fiber output, form the first output signal, the first output signal is coherent wind laser radar pulse signal; The laser beam of 0 order diffraction port output is exported via the 3rd single-mode polarization maintaining fiber, forms the second output signal, and the second output signal is coherent wind laser radar reference local oscillator laser signal.
Described the second output signal can also produce in the following manner: laser signal produces laser signal along separate routes through being arranged on the first single-mode polarization maintaining fiber fiber optic splitter afterwards, this shunt laser signal forms the second output signal through after the 5th single-mode polarization maintaining fiber, and the second output signal is coherent wind laser radar reference local oscillator laser signal.
Described the second output signal can also produce in the following manner: laser signal produces laser signal along separate routes through being arranged on the first single-mode polarization maintaining fiber fiber optic splitter afterwards, this shunt laser signal is through after the 5th single-mode polarization maintaining fiber, close bundle with the laser signal of being exported by 0 order diffraction port and transmit through optical-fiber bundling device in the 3rd single-mode polarization maintaining fiber, form the second output signal, the second output signal is coherent wind laser radar reference local oscillator laser signal.
The present invention's beneficial effect is compared with prior art:
(1) the present invention has adopted 2 μ m laser wavelengths, and this wave band belongs to human eye safe waveband, and within atmospheric window, has taken into account security and engineering practicability;
(2) the present invention adopts 2 μ m acousto-optic frequency shifters to carry out frequency modulation (PFM) to laser beam, can export coherent wind laser radar pulse signal and for coherent wind laser radar reference local oscillator laser signal simultaneously;
(3) in the present invention, adopt the propagation medium of polarization-maintaining single-mode fiber as 2 μ m laser, effectively improved the transmission quality of 2 μ m laser, avoided the change of polarization state, make that whole system is compacter, portable, lightweight simultaneously;
(4) the present invention, by chopper for changing continuous laser signal into pulsed laser signal, operates simplyr, and reliability is higher, is easier to Project Realization;
(5) the present invention adopts the external external drive signal of chopper, by regulating cycle and the dutycycle of external drive signal, can provide wider modulation range for laser signal.
Accompanying drawing explanation
Fig. 1 is the system schematic of embodiment one;
Fig. 2 is the system schematic of embodiment two;
Fig. 3 is the system schematic of embodiment three.
Embodiment
Below in conjunction with accompanying drawing, the specific embodiment of the present invention is further described in detail.
The present invention proposes a kind of coherent wind laser radar signal emission coefficient, comprising: fiber laser 1, the first single-mode polarization maintaining fiber 2, the online polarizer 3 of optical fiber, the second single-mode polarization maintaining fiber 4,2 μ m acousto-optic frequency shifters 5, the 3rd single-mode polarization maintaining fiber 6, chopper 7-2 and the 4th single-mode polarization maintaining fiber 8;
2 μ m acousto-optic frequency shifters 5 comprise input port 5-1, frequency modulation (PFM) port 5-2,0 order diffraction port 5-3 and 1 order diffraction port 5-4; Wherein 0 order diffraction port 5-3 is that frequency keeps port, and 1 order diffraction port 5-4 is frequency modulation (PFM) port;
Chopper 7-2 comprises input port and external drive signaling interface 7-1;
Embodiment one: present embodiment as shown in Figure 1, fiber laser 1 is launched 2 μ m continuous laser signals, and export by the first single-mode polarization maintaining fiber 2,2 μ m laser signals enter into the online polarizer 3 of optical fiber, produce linearly polarized laser, then enter into 2 μ m acousto-optic frequency shifters 5 by the input port 5-1 of 2 μ m acousto-optic frequency shifters 5;
The voltage of regulating frequency modulation port 5-2, to 5.2V, reaches diffraction efficiency maximal value, output two-way laser signal;
The laser beam of 1 order diffraction port 5-4 output is exported through the second single-mode polarization maintaining fiber 4, enter chopper 7-2 through the input port of chopper 7-2, external drive signal enters chopper 7-2 by external drive signaling interface 7-1, by regulating cycle and the dutycycle of external drive signal, produce needed laser radar signal, export by the 4th polarization-maintaining single-mode fiber 8, form the first output signal, the first output signal is coherent wind laser radar pulse signal; The laser beam of 0 order diffraction port 5-3 output is exported via the 3rd single-mode polarization maintaining fiber 6, forms the second output signal, and the second output signal is coherent wind laser radar reference local oscillator laser signal.
Embodiment two: present embodiment as shown in Figure 2, fiber laser 1 is launched 2 μ m continuous laser signals, and export by the first single-mode polarization maintaining fiber 2, be divided into the first laser shunting sign and the second laser shunting sign through fiber optic splitter 9, the first laser shunting sign enters into the online polarizer 3 of optical fiber, produce linearly polarized laser, then enter into 2 μ m acousto-optic frequency shifters 5 by the input port 5-1 of 2 μ m acousto-optic frequency shifters 5;
The voltage of regulating frequency modulation port 5-2, to 5.2V, reaches diffraction efficiency maximal value, output two-way laser signal;
The laser beam of 1 order diffraction port 5-4 output is exported through the second single-mode polarization maintaining fiber 4, enter chopper 7-2 through the input port of chopper 7-2, external drive signal enters chopper 7-2 by external drive signaling interface 7-1, by regulating cycle and the dutycycle of external drive signal, produce needed laser radar signal, export by the 4th polarization-maintaining single-mode fiber 8, form the first output signal, the first output signal is coherent wind laser radar pulse signal;
The second laser shunting sign is exported via the 5th single-mode polarization maintaining fiber 10, forms the second output signal, and the second output signal is coherent wind laser radar reference local oscillator laser signal.
Embodiment three: present embodiment as shown in Figure 3, fiber laser 1 is launched 2 μ m continuous laser signals, and export by the first single-mode polarization maintaining fiber 2, be divided into the first laser shunting sign and the second laser shunting sign through fiber optic splitter 9, the first laser shunting sign enters into the online polarizer 3 of optical fiber, produce linearly polarized laser, then enter into 2 μ m acousto-optic frequency shifters 5 by the input port 5-1 of 2 μ m acousto-optic frequency shifters 5;
The voltage of regulating frequency modulation port 5-2, to 5.2V, reaches diffraction efficiency maximal value, output two-way laser signal;
The laser beam of 1 order diffraction port 5-4 output is exported through the second single-mode polarization maintaining fiber 4, enter chopper 7-2 through the input port of chopper 7-2, external drive signal enters chopper 7-2 by external drive signaling interface 7-1, by regulating cycle and the dutycycle of external drive signal, produce needed laser radar signal, export by the 4th polarization-maintaining single-mode fiber 8, form the first output signal, the first output signal is coherent wind laser radar pulse signal;
The laser beam of 0 order diffraction port 5-3 output is exported via the 3rd single-mode polarization maintaining fiber 6, through optical-fiber bundling device 11, close bundle with the second laser shunting sign transmitting through the 5th polarization-maintaining single-mode fiber 10, form the second output signal, the second output signal is coherent wind laser radar reference local oscillator laser signal.
The content not being described in detail in instructions of the present invention belongs to professional and technical personnel in the field's known technology.
Claims (3)
1. a coherent wind laser radar signal emission coefficient, is characterized in that comprising: fiber laser (1), the first single-mode polarization maintaining fiber (2), the online polarizer of optical fiber (3), the second single-mode polarization maintaining fiber (4), 2 μ m acousto-optic frequency shifters (5), the 3rd single-mode polarization maintaining fiber (6), chopper (7-2) and the 4th single-mode polarization maintaining fiber (8);
2 μ m acousto-optic frequency shifters (5) comprise input port (5-1), 0 order diffraction port (5-3) and 1 order diffraction port (5-4); Wherein 0 order diffraction port (5-3) is frequency maintenance port, and 1 order diffraction port (5-4) is frequency modulation (PFM) port;
Chopper (7-2) comprises input port and external drive signaling interface (7-1);
Fiber laser (1) transmitting 2 μ m continuous laser signals, and by the first single-mode polarization maintaining fiber (2) output, 2 μ m laser signals enter into the online polarizer of optical fiber (3), produce linearly polarized laser, then enter into 2 μ m acousto-optic frequency shifters (5) by the input port (5-1) of 2 μ m acousto-optic frequency shifters (5);
The voltage of regulating frequency modulation port (5-2), to 5.2V, reaches diffraction efficiency maximal value, from 0 order diffraction port (5-3) and 1 order diffraction port (5-4) output two-way laser signal;
The laser beam of 1 order diffraction port (5-4) output is exported through the second single-mode polarization maintaining fiber (4), enter chopper (7-2) through the input port of chopper (7-2), external drive signal enters chopper (7-2) by external drive signaling interface (7-1), by regulating cycle and the dutycycle of external drive signal, produce needed laser radar signal, by the 4th polarization-maintaining single-mode fiber (8) output, form the first output signal, the first output signal is coherent wind laser radar pulse signal; The laser beam of 0 order diffraction port (5-3) output is exported via the 3rd single-mode polarization maintaining fiber (6), forms the second output signal, and the second output signal is coherent wind laser radar reference local oscillator laser signal.
2. a kind of 2 mu m all-fiber coherent anemometry laser radar signal transmitting systems according to claim 1, it is characterized in that: described the second output signal can also produce in the following manner: laser signal produces laser signal along separate routes through being arranged on the first single-mode polarization maintaining fiber (2) fiber optic splitter (9) afterwards, this shunt laser signal forms the second output signal afterwards through the 5th single-mode polarization maintaining fiber (10), and the second output signal is coherent wind laser radar reference local oscillator laser signal.
3. a kind of 2 mu m all-fiber coherent anemometry laser radar signal transmitting systems according to claim 1, it is characterized in that: described the second output signal can also produce in the following manner: laser signal produces laser signal along separate routes through being arranged on the first single-mode polarization maintaining fiber (2) fiber optic splitter (9) afterwards, this shunt laser signal through the 5th single-mode polarization maintaining fiber (10) afterwards, close bundle with the laser signal of being exported by 0 order diffraction port (5-3) and transmit through optical-fiber bundling device (11) in the 3rd single-mode polarization maintaining fiber (6), form the second output signal, the second output signal is coherent wind laser radar reference local oscillator laser signal.
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| CN201410119758.7A CN103869301B (en) | 2014-03-27 | 2014-03-27 | A kind of coherent wind lidar pulse signal launching system |
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| CN201410119758.7A CN103869301B (en) | 2014-03-27 | 2014-03-27 | A kind of coherent wind lidar pulse signal launching system |
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| CN103869301A true CN103869301A (en) | 2014-06-18 |
| CN103869301B CN103869301B (en) | 2016-06-01 |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105005054A (en) * | 2015-08-24 | 2015-10-28 | 中国科学技术大学 | Non-scanning continuous optical coherence speed measurement laser radar based on time-division multiplexing |
| CN108023268A (en) * | 2018-01-05 | 2018-05-11 | 褚宏伟 | A kind of burst mode ultrafast laser and its method of work |
| CN109991623A (en) * | 2019-04-30 | 2019-07-09 | 深圳市镭神智能系统有限公司 | A kind of distribution type laser radar |
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| CN101082671A (en) * | 2007-06-27 | 2007-12-05 | 中国科学院上海光学精密机械研究所 | Method and device for detecting underwater acoustic signal with coherent laser remote sense |
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2014
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Patent Citations (3)
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| WO2007036933A2 (en) * | 2005-09-27 | 2007-04-05 | Elbit Systems Electro-Optics Elop Ltd. | High power fiber laser |
| CN101082671A (en) * | 2007-06-27 | 2007-12-05 | 中国科学院上海光学精密机械研究所 | Method and device for detecting underwater acoustic signal with coherent laser remote sense |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105005054A (en) * | 2015-08-24 | 2015-10-28 | 中国科学技术大学 | Non-scanning continuous optical coherence speed measurement laser radar based on time-division multiplexing |
| CN108023268A (en) * | 2018-01-05 | 2018-05-11 | 褚宏伟 | A kind of burst mode ultrafast laser and its method of work |
| CN108023268B (en) * | 2018-01-05 | 2024-03-15 | 褚宏伟 | Burst pulse mode ultrafast laser and working method thereof |
| CN109991623A (en) * | 2019-04-30 | 2019-07-09 | 深圳市镭神智能系统有限公司 | A kind of distribution type laser radar |
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