CN106772439A - The cabin formula LDV technique and its measuring method of many distance layering measurement wind fields - Google Patents
The cabin formula LDV technique and its measuring method of many distance layering measurement wind fields Download PDFInfo
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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
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Abstract
The invention discloses a kind of cabin formula LDV technique of many distance layering measurement wind fields, narrow linewidth seed light source output end connects with fiber amplifier input, fiber amplifier output end connects with fiber optic splitter input, the output end of fiber optic splitter first connects with acousto-optic frequency shifters input, the output end of fiber optic splitter second connects with optical fiber circulator first port, acousto-optic frequency shifters output end connects with optical-fiber bundling device first input end, the port of optical fiber circulator the 3rd connects with the input of optical-fiber bundling device second, optical fiber circulator second port connects with photoswitch input, photoswitch multiple output port connects with even number root optical antenna, 2 × 2 optical-fiber bundling device output ends are connected with balance photodetector input, balance photodetector output end connects with signal processing circuit.Present invention also offers a kind of measuring method of the cabin formula LDV technique of many distance layering measurement wind fields.Beneficial effects of the present invention：Radar cost is reduced, increases radar wind field measurement capability.
Description
Technical Field
The invention relates to the technical field of meteorological radar detection, in particular to a cabin type laser wind measuring radar for multi-distance layered measurement of a wind field and a measurement method thereof.
Background
Wind power generation is characterized in that wind energy is converted into electric energy, the wind direction and the wind speed of a wind power plant are accurately and timely measured, and a wind generating set is adjusted to the optimal position, so that the wind power generation is the key for improving the generating efficiency and reducing the equipment abrasion. The data obtained by the traditional anemometer tower anemometry mode adopted by the wind power plant in anemometry has larger deviation with the actual wind direction and wind speed of a single fan, so that the fan cannot be well adjusted to the optimal position, and the wind power efficiency is influenced. In order to improve the power generation efficiency, foreign manufacturers develop cabin type laser wind-finding radars. The nacelle type laser wind-measuring radar controller is safely connected with a fan turbine control system according to a unified protocol, and the laser wind-measuring radar measures accurate wind speed and wind direction in a large area in front of blades of the wind generating set. The laser wind-finding radar transmits data to the laser wind-finding radar controller every second, and sends dynamic detection and yaw correction commands to the fan turbine control system in time so as to calibrate the position in advance to obtain the maximum wind energy. Therefore, on the premise of not increasing the torsion and the tension of the key parts, the reaction speed of the fan is accelerated, the abrasion of the fan is reduced, and the faults are reduced.
Known cabin Lidar products are Wind Iris from Leosphere, france, WindEye from windadronics, denmark, ZephIR DM from ZephIR, uk, nacellel Lidar from MITSUBISHI ELECTRICs, yawadadvisor from Epsiline, france. The WindEye adopts a continuous laser system, has small volume and low cost, but can only measure a wind field at a fixed distance (80 meters) at a fixed point and cannot well meet the application requirement.
The distance of the YawAdvisor system for measuring the wind field is only 10 meters, and the application range is small. The Wind Iris adopts a pulse laser system, the measuring distance range is 50-400 m, and the minimum distance resolution is 30 m. The Nacelle Lidar adopts a pulse laser system, the measuring distance range is 50-250 meters, and the minimum distance resolution is 25 meters. Wind Iris and Nacelle Lidar can both be layered on distances, namely Wind speed and Wind direction on a plurality of distances can be measured simultaneously, but a pulse laser is adopted, the whole machine is large in size and high in cost, and a common small Wind generating set is difficult to bear. The ZephiIR DM adopts a continuous laser system, realizes adjustable measurement distances of 10-300 meters in a motor focusing mode, can measure wind fields at 10 distances, realizes wind speed and wind direction measurement at different heights by adopting an adjusting mode through a continuous laser, but the focusing mode ensures that the time consumption for completing the measurement of the whole wind field at one time is long, and mechanical scanning and focusing components ensure poor reliability and short service life of the whole machine.
Disclosure of Invention
In order to solve the above problems, the present invention aims to provide a cabin type laser wind-finding radar for multi-distance layered measurement of wind field and a measurement method thereof, which reduces the radar cost and increases the radar wind field measurement capability.
The invention provides a cabin type laser wind measuring radar for multi-distance layered measurement of a wind field, which comprises: the device comprises a narrow-linewidth seed light source, an optical fiber amplifier, an optical fiber beam splitter, an acousto-optic frequency shifter, an optical fiber circulator, an optical switch, a plurality of optical antennas, a 2 x 2 optical fiber beam combiner, a balanced photoelectric detector and a signal processing circuit;
the output end of the narrow linewidth seed light source is connected with the input end of the optical fiber amplifier, the output end of the optical fiber amplifier is connected with the input end of the optical fiber beam splitter, the first output end of the optical fiber beam splitter is connected with the input end of the acousto-optic frequency shifter, the second output end of the optical fiber beam splitter is connected with the first port of the optical fiber circulator, the output end of the acousto-optic frequency shifter is connected with the first input end of the 2 x 2 optical fiber beam combiner, the third port of the optical fiber circulator is connected with the second input end of the 2 x 2 optical fiber beam combiner, the second port of the optical fiber circulator is connected with the input end of the optical switch, a plurality of output ports of the optical switch are connected with a plurality of optical antennas, and the first output end and the second output end of the 2 x 2 optical fiber beam combiner are connected with the input end of the balanced photoelectric detector, the output end of the balance photoelectric detector is connected with the signal processing circuit;
wherein,
including even number root optical antenna, an optical antenna with an output port of photoswitch is connected, and two antennas that longitudinal symmetry and slope set up are a set of, and two antennas are equal with the contained angle of horizontal direction, and two ways of focused measuring beam are launched forward to every group antenna, and the fixed distance of difference is focused on to the measuring beam of multiunit antenna with the transmission.
As a further improvement of the invention, the narrow linewidth seed light source outputs continuous laser with the wavelength of 1.5 microns, the spectral linewidth is less than 200kHz, the polarization state is linear polarization, the single-mode polarization-maintaining optical fiber outputs light, and the output light power is 1-100 mW.
As a further improvement of the invention, the narrow linewidth seed light source is a single-frequency narrow linewidth semiconductor laser, or a DBR fiber laser, or a DFB fiber laser, or a solid laser with tail fiber output.
As a further improvement of the invention, the optical fiber amplifier is a multi-stage optical fiber amplifier formed by a single-mode optical fiber amplifier or a double-clad optical fiber amplifier or a combination of the two.
As a further improvement of the invention, the frequency shift amount of the acousto-optic frequency shifter is that the frequency shift is not less than 40 MHz.
As a further improvement of the present invention, the average power of the output beam of the optical switch is greater than 400 mW.
The invention also provides a measuring method of the cabin type laser wind measuring radar for measuring the wind field in a multi-distance layered mode, which comprises the following steps:
step 1, local oscillation light generated by the narrow-linewidth seed light source passes through the optical fiber amplifier, enters the acousto-optic frequency shifter through a first output end of the optical fiber beam splitter, and then enters a first input end of the 2 x 2 optical fiber beam combiner;
step 2, the signal light generated by the narrow linewidth seed light source enters a first port of the optical fiber circulator through a second output end of the optical fiber beam splitter after passing through the optical fiber amplifier, the signal light enters the optical switch through a second port of the optical fiber circulator, the optical switch switches the input signal light to any output port for output, and the signal light is emitted through an optical antenna correspondingly connected with the output port;
step 3, the optical switch switches the input signal light to the output port correspondingly connected with the optical antenna symmetrically arranged in the step 2 for output, and the output signal light is emitted through the symmetrically arranged optical antenna;
step 4, two symmetrically arranged antennae emit two paths of focused measuring beams forwards,
step 5, returning Doppler frequency shift echo signals generated by the reflection of the two optical antennas along a transmitting light path, outputting the Doppler frequency shift echo signals from a third port of the optical fiber circulator, and simultaneously enabling the output echo signals to enter a second input end of the 2 x 2 optical fiber beam combiner;
step 6, after each path of echo signals and local oscillator light are combined through the 2 x 2 optical fiber beam combiner, the combined signals are incident on the balance detector to generate heterodyne signals, the heterodyne signals are sent to the signal processing circuit, Doppler frequency is extracted according to the Doppler principle, and the radial wind speed of each path of measuring light beam is obtained;
step 7, obtaining wind speed and wind direction information on a focusing distance plane of each group of focusing light beams through formula-calculation;
in the formula, Vlos1And Vlos2Respectively representing radial wind speeds pointed by the two light beams, α representing an included angle between the light beam pointing direction and the axis of the wind generating set, phi representing an included angle between the wind direction and the axis of the wind generating set, W representing a wind speed along the axis of the wind generating set, U representing a wind field component vertical to the axis of the wind generating set, and V representing the wind vector;
and 8, repeating the steps 3-7, wherein the optical switch is circularly reciprocated, input signal light is sequentially switched to each output port to be output and is emitted through an optical antenna correspondingly connected with each output port, a plurality of groups of antennas focus emitted measuring beams to different fixed distances, a plurality of paths of Doppler frequency shift echo signals are returned along an emission light path, enter the 2 x 2 optical fiber beam combiner after being output through the optical fiber circulator and are incident on the balance detector together with a local oscillator beam to generate a plurality of paths of heterodyne signals, a plurality of Doppler frequencies are extracted through the signal processing circuit to respectively obtain the radial wind speeds of the plurality of paths of measuring beams, and wind speed and wind direction information on different focusing distance planes of the plurality of groups of focusing beams are sequentially calculated.
The invention has the beneficial effects that:
1. the adopted light source has narrow spectral line width, can output continuous laser, and has low cost and safety for human eyes;
2. the laser wind measuring radar adopts an all-fiber structure, has no mechanical rotating part, and has simple and reliable structure;
3. the optical fiber components are all polarization maintaining devices, and the radar outputs line polarized laser;
4. the optical coherent detection method is adopted, so that the sensitivity is high;
5. accurate wind speed and wind direction in front of the wind generating set can be measured in a layered mode at different distances.
Drawings
FIG. 1 is a schematic structural diagram of a cabin type laser wind-measuring radar for multi-distance layered measurement of a wind field according to an embodiment of the present invention;
fig. 2 is a schematic view of the principle of a dual beam measurement using the radar shown in fig. 1.
In the figure, the position of the upper end of the main shaft,
1. a narrow line width seed light source; 2. an optical fiber amplifier; 3. an optical fiber beam splitter; 4. an acousto-optic frequency shifter; 5. a fiber optic circulator; 6. an optical switch; 7. a first optical antenna; 8. a second optical antenna; 9. a third optical antenna; 10. a fourth optical antenna; 11. a fifth optical antenna; 12. a sixth optical antenna; 13. a 2 x 2 optical fiber combiner; 14. a balanced photodetector; 15. a signal processing circuit.
Detailed Description
The present invention will be described in further detail below with reference to specific embodiments and with reference to the attached drawings.
Embodiment 1, as shown in fig. 1, a nacelle type laser wind-measuring radar for multi-distance layered measurement of a wind field according to an embodiment of the present invention includes: the device comprises a narrow-linewidth seed light source 1, an optical fiber amplifier 2, an optical fiber beam splitter 3, an acousto-optic frequency shifter 4, an optical fiber circulator 5, an optical switch 6, a first optical antenna 7, a second optical antenna 8, a third optical antenna 9, a fourth optical antenna 10, a fifth optical antenna 11, a sixth optical antenna 12, a 2 x 2 optical fiber beam combiner 13, a balanced photoelectric detector 14 and a signal processing circuit 15.
The output end of the narrow-linewidth seed light source 1 is connected with the input end of the optical fiber amplifier 2, the output end of the optical fiber amplifier 2 is connected with the input end of the optical fiber splitter 3, the first output end 31 of the optical fiber splitter 3 is connected with the input end of the acousto-optic frequency shifter 4, the second output end 32 of the optical fiber splitter 3 is connected with the first port 51 of the optical fiber circulator 5, the output end of the acousto-optic frequency shifter 4 is connected with the first input end 131 of the 2 x 2 optical beam combiner 13, the third port 53 of the optical fiber circulator 5 is connected with the second input end 132 of the 2 x 2 optical beam combiner 13, the second port 53 of the optical fiber circulator 5 is connected with the input end of the optical switch 6, the first output port of the optical switch 6 is connected with the first optical antenna 7, the second output port of the optical switch 6 is connected with the second optical antenna 8, the third output port of the optical switch 6 is connected with the third optical antenna 9, the fourth output port of the optical switch 6 is connected to the fourth optical antenna 10, the fifth output port of the optical switch 6 is connected to the fifth optical antenna 11, the sixth output port of the optical switch 6 is connected to the sixth optical antenna 12, the first output end 133 and the second output end 134 of the 2 × 2 optical fiber combiner 13 are connected to the input end of the balanced photodetector 14, and the output end of the balanced photodetector 14 is connected to the signal processing circuit 15.
The narrow-linewidth seed light source 1 outputs continuous laser with the wavelength of 1.5 microns, the spectral linewidth is less than 200kHz, the polarization state is linear polarization, the single-mode polarization-maintaining optical fiber outputs light, and the output light power is 1-100 mW. Specifically, a single-frequency narrow-linewidth semiconductor laser, or a DBR fiber laser, or a DFB fiber laser, or a solid laser with tail fiber output can be adopted.
The optical fiber amplifier 2 is a single-mode optical fiber amplifier or a double-clad optical fiber amplifier or a multi-stage optical fiber amplifier formed by combining the single-mode optical fiber amplifier and the double-clad optical fiber amplifier.
The frequency shift amount of the acousto-optic frequency shifter 4 is up-shift not less than 40 MHz.
The first optical antenna 7 and the sixth optical antenna 12 form a group, the aperture of the light passing is 25mm, the included angle of the light beams emitted by the first optical antenna 7 and the sixth optical antenna 12 is 60 degrees, and the focusing distance is 30 meters.
The second optical antenna 8 and the fifth optical antenna 11 form a group, the aperture of the light passing is 50mm, the included angle of the light beams emitted by the second optical antenna 8 and the fifth optical antenna 11 is 60 degrees, and the focusing distance is 75 meters.
The third optical antenna 9 and the fourth optical antenna 10 form a group of light-transmitting apertures with a diameter of 75mm, the included angle between the light beams emitted by the third optical antenna 9 and the sixth optical antenna 12 is 60 degrees, and the focusing distance is 120 meters.
The average power of the output beam of the optical switch 6 is more than 400 mW. The output end of the optical switch 6 is sequentially switched according to the sequence of the first optical antenna 7, the sixth optical antenna 12, the second optical antenna 8, the fifth optical antenna 11, the third optical antenna 9 and the fourth optical antenna 10.
The number of the antennas, the light transmission aperture of the optical antenna and the focusing distance in the embodiment can be changed according to actual requirements.
Embodiment 2, a method for measuring a nacelle type laser wind-measuring radar for measuring a wind field in multiple distance layers, the method comprising the steps of:
step 1, local oscillation light generated by a narrow-linewidth seed light source 1 passes through an optical fiber amplifier 2, enters an acousto-optic frequency shifter 4 through a first output end 31 of an optical fiber beam splitter 3, and then enters a first input end 131 of a 2 x 2 optical fiber beam combiner 13;
step 2, after passing through the optical fiber amplifier 2, the signal light generated by the narrow-linewidth seed light source 1 enters the first port 51 of the optical fiber circulator 5 through the second output end 32 of the optical fiber beam splitter 3, the signal light enters the optical switch 6 through the second port 52 of the optical fiber circulator 5, and the optical switch 6 switches the input signal light to the first output port for output and emits the signal light through the first optical antenna 7;
step 3, the optical switch 6 switches the input signal light to a sixth output port for output, and transmits the signal light through a sixth optical antenna 12;
step 4, the first optical antenna 7 and the sixth optical antenna 12 emit two focused measuring beams forward;
step 5, the doppler shift echo signals generated by the reflection of the first optical antenna 7 and the sixth optical antenna 12 both return along the emission light path and are output from the third port 53 of the optical fiber circulator 5, and meanwhile, the output echo signals enter the second input end 132 of the 2 × 2 optical fiber combiner 13;
step 6, after the two echo signals and the local oscillator light are combined by the 2 × 2 optical fiber combiner 13, the two echo signals are incident on the balance detector 14 to generate heterodyne signals, the heterodyne signals are sent to the signal processing circuit 15, the Doppler frequency is extracted according to the Doppler principle, and the radial wind speed of each measured light beam is respectively obtained;
step 7, as shown in fig. 2, the radial wind speed of the light beam emitted by the first optical antenna 7 is Vlos1The radial wind speed of the light beam emitted by the sixth optical antenna 12 is Vlos2The included angle between the light beams emitted by the first optical antenna 7 and the sixth optical antenna 12 is 60 degrees, namely 2 α is 60 degrees, and wind speed and wind direction information on a focusing distance plane of each group of focusing light beams are obtained through calculation by formulas (1) to (4), wherein the included angle phi between the wind direction and the axis of the wind generating set, the wind speed W along the axis direction of the wind generating set, a wind field component U vertical to the axis direction of the wind generating set and the wind vector size V are obtained;
step 8, repeating the steps 3-7, the optical switch 6 is circularly reciprocated to switch the input signal light to the second output port, the fifth output port, the third output port and the fourth output port for output in turn, and the second optical antenna 8, the fifth optical antenna 11, the third optical antenna 9 and the fourth optical antenna 10 are emitted, the two groups of antennas focus the emitted measuring beams to different fixed distances, four paths of Doppler frequency shift echo signals all return along the emission light path, and enters a 2 multiplied by 2 optical fiber beam combiner 13 after being output by the optical fiber circulator 5 to be incident on a balance detector 14 together with the local oscillator beam to generate a plurality of paths of heterodyne signals, and a plurality of Doppler frequencies are extracted through the signal processing circuit 15, the radial wind speeds of the four measuring beams are respectively obtained, and wind speed and wind direction information on different focusing distance planes of a plurality of groups of focusing beams are sequentially calculated.
The narrow linewidth seed light source with low power output is amplified by the optical fiber amplifier, a laser beam is split by the optical fiber beam splitter and is used as local oscillator light for radar coherent detection after frequency shift of the acousto-optic frequency shifter, and the rest light beams are incident from one port of the optical fiber circulator, are emitted from the two ports, are switched in the light beam direction by the optical switch and are emitted from different optical antennas. The device comprises a plurality of optical antennas, wherein each optical antenna comprises a group of two optical antennas, each group of optical antennas points to a certain included angle, two focusing measuring beams are emitted forwards horizontally, and each group of optical antennas focuses the emitted beams to different fixed distances. Echo signals which are generated by aerosol in the atmosphere scattering at the focusing position of the light beam and are Doppler-shifted return along the transmitting light path, and the echo signals are output from the circulator. The echo signals and the local oscillator light are combined through a 2 x 2 optical fiber beam combiner and then enter a balance detector to generate heterodyne signals, the heterodyne signals are sent to a signal processing circuit to extract Doppler frequency, speed information is obtained, and finally wind field distribution is obtained through an inversion algorithm. Wind speed and wind direction information on one focal distance plane can be obtained by one group of light beams focused at different distances, and wind speed and wind direction information on several different focal distance planes can be obtained by several groups of light beams.
By utilizing different focusing positions of the multiple optical antennas, the cabin type laser wind measuring radar capable of measuring accurate wind speed and accurate wind direction in front of the wind generating set in a layered mode at different distances can be achieved, wind field information is provided for calibration of the wind generating set, and the laser wind measuring radar is suitable for application fields of manufacturing and control of intelligent fans and the like.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (7)
1. A multi-distance layered measurement wind field cabin type laser wind-measuring radar is characterized by comprising: the device comprises a narrow-linewidth seed light source (1), an optical fiber amplifier (2), an optical fiber beam splitter (3), an acousto-optic frequency shifter (4), an optical fiber circulator (5), an optical switch (6), a plurality of optical antennas, a 2 x 2 optical fiber beam combiner (13), a balanced photoelectric detector (14) and a signal processing circuit (15);
the output end of the narrow linewidth seed light source (1) is connected with the input end of the optical fiber amplifier (2), the output end of the optical fiber amplifier (2) is connected with the input end of the optical fiber beam splitter (3), the first output end (31) of the optical fiber beam splitter (3) is connected with the input end of the acousto-optic frequency shifter (4), the second output end (32) of the optical fiber beam splitter (3) is connected with the first port (51) of the optical fiber circulator (5), the output end of the acousto-optic frequency shifter (4) is connected with the first input end (131) of the 2 x 2 optical fiber combiner (13), the third port (53) of the optical fiber circulator (5) is connected with the second input end (132) of the 2 x 2 optical fiber combiner (13), and the second port (53) of the optical fiber circulator (5) is connected with the input end of the optical switch (6), a plurality of output ports of the optical switch (6) are connected with a plurality of optical antennas, a first output end (133) and a second output end (134) of the 2 x 2 optical fiber combiner (13) are connected with the input end of a balanced photoelectric detector (14), and the output end of the balanced photoelectric detector (14) is connected with a signal processing circuit (15);
wherein,
including even number root optical antenna, an optical antenna with an output port of photoswitch (6) is connected, and two antennas that longitudinal symmetry and slope set up are a set of, and two antennas are equal with the contained angle of horizontal direction, and two ways focused measuring beam are launched forward to every group antenna, and the fixed distance of difference is focused on to the measuring beam that the multiunit antenna will be launched.
2. The nacelle-type lidar of claim 1, wherein the narrow linewidth seed light source (1) outputs continuous laser light with a wavelength of 1.5 μm, a spectral linewidth of less than 200kHz, a polarization state of linear polarization, a single-mode polarization maintaining fiber output, and an output light power of 1-100 mW.
3. The airborne lidar of claim 2, wherein the narrow linewidth seed light source (1) is a single-frequency narrow linewidth semiconductor laser, or a DBR fiber laser, or a DFB fiber laser, or a solid state laser with pigtail output.
4. The airborne lidar of claim 1, wherein said fiber amplifier (2) is a single mode fiber amplifier or a double clad fiber amplifier or a combination of both.
5. The airborne lidar of claim 1, wherein the amount of frequency shift of the acousto-optic frequency shifter (4) is an up shift of not less than 40 MHz.
6. The airborne lidar of claim 1, wherein the optical switch (6) outputs a beam average power of greater than 400 mW.
7. A method of measuring a nacelle laser wind-measuring radar for multi-distance layered measurement of wind fields according to claim 1, comprising the steps of:
step 1, local oscillation light generated by the narrow-linewidth seed light source (1) passes through the optical fiber amplifier (2), enters the acousto-optic frequency shifter (4) through a first output end (31) of the optical fiber beam splitter (3), and then enters a first input end (131) of the 2 x 2 optical fiber beam combiner (13);
step 2, after passing through the optical fiber amplifier (2), the signal light generated by the narrow-linewidth seed light source (1) enters a first port (51) of the optical fiber circulator (5) through a second output end (32) of the optical fiber beam splitter (3), the signal light enters the optical switch (6) through a second port (52) of the optical fiber circulator (5), and the optical switch (6) switches the input signal light to any output port for output and transmits the signal light through an optical antenna correspondingly connected with the output port;
step 3, the optical switch (6) switches the input signal light to the output port correspondingly connected with the optical antenna symmetrically arranged in the step 2 for output, and the output signal light is emitted through the symmetrically arranged optical antenna;
step 4, two symmetrically arranged antennae emit two paths of focused measuring beams forwards,
step 5, returning Doppler frequency shift echo signals generated by the reflection of the two optical antennas along a transmitting light path, outputting the Doppler frequency shift echo signals from a third port (53) of the optical fiber circulator (5), and simultaneously enabling the output echo signals to enter a second input end (132) of the 2 x 2 optical fiber beam combiner (13);
step 6, after each path of echo signals and local oscillator light are combined through the 2 x 2 optical fiber beam combiner (13), the combined signals are incident on the balance detector (14) to generate heterodyne signals, the heterodyne signals are sent to the signal processing circuit (15), Doppler frequency is extracted according to the Doppler principle, and the radial wind speed of each path of measured light beams is obtained;
step 7, calculating to obtain wind speed and wind direction information on a focusing distance plane of each group of focusing beams according to the formulas (1) to (4);
in the formula, Vlos1And Vlos2Respectively representing radial wind speeds pointed by the two light beams, α representing an included angle between the light beam pointing direction and the axis of the wind generating set, phi representing an included angle between the wind direction and the axis of the wind generating set, W representing a wind speed along the axis of the wind generating set, U representing a wind field component vertical to the axis of the wind generating set, and V representing the wind vector;
and 8, repeating the steps 3-7, wherein the optical switch (6) is circularly reciprocated, input signal light is sequentially switched to each output port to be output and is transmitted out through an optical antenna correspondingly connected with each output port, a plurality of groups of antennas focus the transmitted measuring beams to different fixed distances, multi-channel Doppler frequency shift echo signals are returned along a transmitting light path, are output through the optical fiber circulator (5), enter the 2 x 2 optical fiber beam combiner (13) and are incident on the balance detector (14) together with the local oscillator optical beam to generate multi-channel heterodyne signals, a plurality of Doppler frequencies are extracted through the signal processing circuit (15), the radial wind speeds of the multi-channel measuring beams are respectively obtained, and wind speed and wind direction information on different focusing distance planes of the plurality of groups of focusing beams are sequentially calculated.
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| CN201710010915.4A CN106772439B (en) | 2017-01-06 | 2017-01-06 | Cabin type laser wind-finding radar for multi-distance layered measurement wind field and measurement method thereof |
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| CN201710010915.4A CN106772439B (en) | 2017-01-06 | 2017-01-06 | Cabin type laser wind-finding radar for multi-distance layered measurement wind field and measurement method thereof |
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| CN109188461A (en) * | 2018-08-31 | 2019-01-11 | 成都盈风智创激光技术有限公司 | For measuring the cabin formula LDV technique of different height wind field |
| CN109212551A (en) * | 2018-11-13 | 2019-01-15 | 西安工业大学 | A kind of no speed limit can sensing optical fiber Doppler anemometer and its speed-measuring method |
| CN110058258A (en) * | 2019-05-15 | 2019-07-26 | 国耀量子雷达科技有限公司 | A kind of atmospheric boundary layer detection method based on mixed type laser radar |
| CN110231630A (en) * | 2019-06-06 | 2019-09-13 | 南京牧镭激光科技有限公司 | The adaptive beam scanning method of cabin formula anemometry laser radar |
| CN110261644A (en) * | 2018-07-27 | 2019-09-20 | 成都信息工程大学 | A kind of airborne measuring wind speed laser radar system |
| CN110531378A (en) * | 2019-06-13 | 2019-12-03 | 山西大学 | A kind of Wind turbines continuous wave laser coherent wind radar system |
| CN112130171A (en) * | 2020-08-24 | 2020-12-25 | 成都英鑫光电科技有限公司 | LiDAR, LiDAR systems and wind turbines |
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| CN109212551B (en) * | 2018-11-13 | 2022-11-15 | 西安工业大学 | Optical fiber Doppler velocimeter without upper speed limit and capable of distinguishing direction and velocity measuring method thereof |
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| CN110231630B (en) * | 2019-06-06 | 2021-06-11 | 南京牧镭激光科技有限公司 | Cabin type wind measuring laser radar self-adaptive light beam scanning method |
| CN110531378A (en) * | 2019-06-13 | 2019-12-03 | 山西大学 | A kind of Wind turbines continuous wave laser coherent wind radar system |
| CN113534167A (en) * | 2020-04-22 | 2021-10-22 | 北京万集科技股份有限公司 | Phased array laser radar chip with switchable antennas, use method and laser radar |
| CN113534167B (en) * | 2020-04-22 | 2024-03-08 | 北京万集科技股份有限公司 | Phased array laser radar chip capable of switching antennas, using method and laser radar |
| CN112130171A (en) * | 2020-08-24 | 2020-12-25 | 成都英鑫光电科技有限公司 | LiDAR, LiDAR systems and wind turbines |
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