CN113391327A - Doppler wind finding radar system and method based on continuous laser - Google Patents
Doppler wind finding radar system and method based on continuous laser Download PDFInfo
- Publication number
- CN113391327A CN113391327A CN202110873015.9A CN202110873015A CN113391327A CN 113391327 A CN113391327 A CN 113391327A CN 202110873015 A CN202110873015 A CN 202110873015A CN 113391327 A CN113391327 A CN 113391327A
- Authority
- CN
- China
- Prior art keywords
- light
- laser
- module
- signal
- detection
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 238000000034 method Methods 0.000 title claims abstract description 22
- 238000001514 detection method Methods 0.000 claims abstract description 105
- 238000012545 processing Methods 0.000 claims abstract description 38
- 239000000835 fiber Substances 0.000 claims abstract description 22
- 230000000007 visual effect Effects 0.000 claims abstract description 11
- 230000003287 optical effect Effects 0.000 claims description 30
- 239000013307 optical fiber Substances 0.000 claims description 21
- 230000008878 coupling Effects 0.000 claims description 12
- 238000010168 coupling process Methods 0.000 claims description 12
- 238000005859 coupling reaction Methods 0.000 claims description 12
- 239000002245 particle Substances 0.000 claims description 11
- 239000005427 atmospheric aerosol Substances 0.000 claims description 7
- 230000010355 oscillation Effects 0.000 claims description 6
- 238000012360 testing method Methods 0.000 claims description 5
- 239000000203 mixture Substances 0.000 claims 1
- 230000008569 process Effects 0.000 abstract description 2
- 238000005259 measurement Methods 0.000 description 8
- 239000000443 aerosol Substances 0.000 description 5
- 230000015572 biosynthetic process Effects 0.000 description 5
- 238000003786 synthesis reaction Methods 0.000 description 5
- 238000010586 diagram Methods 0.000 description 4
- 230000003321 amplification Effects 0.000 description 2
- 230000035559 beat frequency Effects 0.000 description 2
- 230000001427 coherent effect Effects 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000003199 nucleic acid amplification method Methods 0.000 description 2
- 238000010248 power generation Methods 0.000 description 2
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 230000004075 alteration Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 238000004364 calculation method Methods 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 230000025518 detection of mechanical stimulus involved in sensory perception of wind Effects 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
Images
Classifications
-
- 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
-
- 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
- G01S7/481—Constructional features, e.g. arrangements of optical elements
-
- 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
The invention discloses a Doppler wind finding radar system and a method based on continuous laser.A continuous fiber laser module generates detection signal light and local oscillator light, the detection signal light is input into a light path control and transceiving module, and the local oscillator light is input into a balance detection module; the light path control and transceiving module emits the detection signal light into the atmosphere to be observed, receives the back scattering echo signal light and inputs the back scattering echo signal light into the balance detection module; the balance detection module converts the signal light into a Doppler frequency shift electric signal; the signal processing module processes the electric signals to obtain the visual direction and wind speed information; the invention has the advantages that the high-speed resolution and the distance resolution at the middle and short distances in the detection direction of the radar system are measured, and the system is convenient to assemble and debug; the requirement on the output power of the laser module is lower, so that the power consumption of the laser is lower, and the reliability is higher; the wind-measuring radar system has wide adaptability and is used in various environments and functions.
Description
Technical Field
The invention relates to the technical field of laser radars, in particular to a Doppler wind finding radar system and method based on continuous laser.
Background
Atmospheric wind field detection is an important component of the meteorological field, and wind has a significant impact on human activities. In the field of aerospace, meteorological monitoring and forecasting are important factors for guaranteeing flight safety, airspace wind field information is accurately and quickly updated, relevant data are reflected to a pilot, and great help is brought to flight safety; in the field of wind power generation, in order to develop wind energy more efficiently and safely, real-time wind field detection data is needed to control the operating state of wind power generation equipment; in the military field, wind field detection can provide important guarantee for the safe use and accurate striking of weapons in the air, in the air and in the air, and the meteorological guarantee of military activities such as personnel, equipment parachuting, artillery shooting and the like also needs to be realized through atmospheric wind field detection; in the meteorological field, the future weather, especially the typhoon weather forecast can be predicted more accurately through accurate atmospheric wind field information.
The existing detection equipment for atmospheric wind field detection is divided into a passive wind measurement mode and an active wind measurement mode according to working modes. Typical devices of the former are pitot tubes, meteorological balloons and wind cup anemometers, and typical devices of the latter are microwave wind-measuring radars and laser wind-measuring radars. The passive wind measuring equipment can only measure local wind field information of the position of the detector, the obtained information amount is less, if the wind field in the area range needs to be detected, related equipment needs to be installed in the detection area according to certain density, and the total cost is higher. In the frequency band used by the microwave wind measuring radar, echo signals are generated only by the action of the microwave wind measuring radar and large-size particles such as cloud, rain, snow and the like in the atmosphere, and the intensity of the echo signals generated by the microwave radar to atmospheric molecules and aerosol is very low under the condition of clear sky, so that a detection blind area is formed, and the detection performance of the microwave radar is poor. The laser wind-finding radar uses infrared laser with shorter wavelength, realizes the detection of wind signals by detecting scattering signals of atmospheric molecules and aerosol, has less influence of weather on the detection performance, and has very high time and space resolution.
Currently, the most widely used lidar is pulse lidar or continuous lidar based on the doppler coherent detection principle. The laser wind-finding radar uses single-frequency laser as a detection light source, heterodyne detection is carried out on a backward scattering signal of the detection light by using a local oscillation light signal and aerosol particles in the atmosphere, the visual direction and the wind speed are calculated by detecting difference frequency information in a Doppler signal, and wind field data are further obtained through inversion.
The pulse laser wind-finding radar obtains the distance of the scattered signal position relative to the radar system by calculating the receiving and sending delay time of the pulse laser, and because the pulse width and the distance gate are different, the pulse laser wind-finding radar possibly has a blind area of dozens to hundreds of meters in the front of the detection direction of the radar system, and the blind area of dozens to hundreds of meters in the detection direction of the radar system can not be measured by the pulse laser.
In view of this, the present application is specifically made.
Disclosure of Invention
The technical problem to be solved by the invention is how to measure the short-distance visual field of a radar system in the detection direction, and the invention aims to provide a Doppler wind finding radar system and a Doppler wind finding radar method based on continuous laser, which can realize the measurement of the spatial position of the radar system in the detection direction, wherein the spatial position is between dozens of meters and hundreds of meters close to the radar system.
The invention is realized by the following technical scheme:
a Doppler wind finding radar system based on continuous laser comprises a continuous fiber laser module, a light path control and transceiving module, a balance detection module and a signal processing module;
the continuous fiber laser module is used for generating continuous detection signal light and local oscillator light, inputting the detection signal light into the light path control and transceiving module, and inputting the local oscillator light into the balance detection module;
the light path control and transceiving module is used for receiving the transmitted detection signal light, emitting the detection signal light to atmosphere to be observed, receiving backscatter echo signal light generated after the detection signal and atmospheric aerosol particles act, and inputting the backscatter echo signal light into the balance detection module;
the balance detection module is used for receiving the backscatter echo signal light and the local oscillator light, mixing the backscatter echo signal light and the local oscillator light, and converting the mixed signal light into a Doppler frequency shift electric signal;
the signal processing module is used for acquiring the Doppler frequency shift electric signals and processing the Doppler frequency shift electric signals to obtain the visual direction and wind speed information of the atmosphere to be observed.
When the wind speed is measured by adopting the traditional radar system, the pulse laser is usually adopted to measure the wind speed in the atmosphere, but when the method is adopted to measure the wind speed in the atmosphere, the pulse laser is adopted, so that a blind area between dozens of meters and hundreds of meters exists in front of the detection direction of the radar system; the invention provides a Doppler wind finding radar system based on continuous laser, in the radar system, the wind speed in the atmosphere is measured by adopting the continuous laser, the problem of a detection blind area of a pulse laser wind finding radar is solved by adjusting the energy spatial distribution of laser emitted by the laser radar, and the measurement of the spatial position between dozens of meters and hundreds of meters close to the radar system is realized.
Preferably, the continuous fiber laser module comprises a laser, an acousto-optic modulator, a fiber splitter and a fiber amplifier, wherein the laser inputs an emergent light source into the fiber splitter; the optical fiber beam splitter splits the light source into a light beam A and a light beam B, the light beam A is sequentially input into the acousto-optic modulator and the optical fiber amplifier to obtain detection signal light, and the detection signal light is input into the light path control and transceiving module; and inputting the light beam B into the balance detection module, wherein the light beam B is local oscillation light.
Preferably, the optical path control and transceiver module includes an optical circulator and a telescope group, the optical circulator is configured to receive the detection signal light and input the detection signal light to the telescope group;
the telescope group is used for transmitting the detection light signal to atmosphere to be observed, receiving backward scattering echo signal light generated after the detection signal and atmospheric aerosol particles react, and inputting the backward scattering echo signal light into the balance detection module through the optical circulator.
Preferably, the balanced detection module includes an optical coupling beam splitter and a balanced detector, where the optical coupling beam splitter is configured to receive the B light beam and the scattered signal light, perform mixing processing on the B light beam and the scattered signal light, and input a mixed optical signal into the balanced detector;
the balance detector is used for converting the mixed optical signal into a Doppler frequency shift electric signal and inputting the Doppler frequency shift electric signal into the signal processing module.
Preferably, the telescope group comprises at least three telescopes, and each telescope points in a different direction.
Preferably, the focal length of the telescope is adjusted within the range of 5 m-200 m.
Preferably, the signal processing module includes a data acquisition card and a data processing board, the data acquisition card is configured to acquire a doppler shift electrical signal processed in the balanced detector module, convert the doppler shift electrical signal into a digital signal, and input the digital signal into the data processing board;
and the data processing board is used for processing the digital signals to obtain the visual direction and wind speed information of the atmosphere to be observed.
The invention also discloses a Doppler anemometry method based on the continuous laser, which adopts the Doppler anemometry radar system based on the continuous laser, and the method comprises the following steps:
starting a radar system, and adjusting the laser power output by a laser to be between 30 and 40 mW;
adjusting the frequency shift of the acousto-optic modulator to the laser to 80 MHz;
adjusting the optical fiber amplifier to ensure that the output optical power of the optical fiber amplifier is 200 mW;
the focal lengths of the telescopes in the telescope group are respectively adjusted to be 10m, 20m, 50m and 100m in sequence, and the telescopes and the horizontal plane are shot into the atmosphere at a pitch angle of 10 degrees to perform wind speed test, so that wind speed information of the atmosphere to be observed is obtained.
Compared with the prior art, the invention has the following advantages and beneficial effects:
1. according to the Doppler wind finding radar system and method based on the continuous laser, the continuous laser is adopted in the radar system for measurement, so that the measurement of high-speed resolution and distance resolution at a middle and short distance in the detection direction of the radar system is realized, and an all-fiber structure is adopted, so that the assembly and debugging of the system are facilitated;
2. according to the Doppler wind finding radar system and method based on the continuous laser, the requirement on the output power of the laser module is lower, the power consumption of the laser can be smaller, and the reliability is higher;
3. the Doppler wind-finding radar system and the Doppler wind-finding radar method based on the continuous laser, provided by the embodiment of the invention, have wide adaptability and can be used in various environments and functions.
Drawings
In order to more clearly illustrate the technical solutions of the exemplary embodiments of the present invention, the drawings that are required to be used in the embodiments will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present invention and therefore should not be considered as limiting the scope, and that for those skilled in the art, other related drawings can be obtained from these drawings without inventive effort.
FIG. 1 is a schematic diagram of an overall module of a radar system
FIG. 2 is the divergence angle of each field after collimation of the telescope
FIG. 3 is a dot diagram of a system focal length of 50m
FIG. 4 is a dot-column diagram of a system focal length of 200m
FIG. 5 is a graph showing the variation of weight function with detection distance under different focal lengths
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described in detail below with reference to examples and accompanying drawings, and the exemplary embodiments and descriptions thereof are only used for explaining the present invention and are not meant to limit the present invention.
In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention. However, it will be apparent to one of ordinary skill in the art that: it is not necessary to employ these specific details to practice the present invention. In other instances, well-known structures, circuits, materials, or methods have not been described in detail so as not to obscure the present invention.
Throughout the specification, reference to "one embodiment," "an embodiment," "one example," or "an example" means: the particular features, structures, or characteristics described in connection with the embodiment or example are included in at least one embodiment of the invention. Thus, the appearances of the phrases "one embodiment," "an embodiment," "one example" or "an example" in various places throughout this specification are not necessarily all referring to the same embodiment or example. Furthermore, the particular features, structures, or characteristics may be combined in any suitable combination and/or sub-combination in one or more embodiments or examples. Further, those of ordinary skill in the art will appreciate that the illustrations provided herein are for illustrative purposes and are not necessarily drawn to scale. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.
In the description of the present invention, the terms "front", "rear", "left", "right", "upper", "lower", "vertical", "horizontal", "upper", "lower", "inner", "outer", etc. indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience of description and simplicity of description, but do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed in a particular orientation, and be operated, and therefore, should not be construed as limiting the scope of the present invention.
Example one
The embodiment discloses a doppler wind radar system based on continuous laser, as shown in fig. 1, comprising a continuous fiber laser module, a light path control and transceiving module, a balance detection module and a signal processing module;
the continuous fiber laser module provides a narrow-linewidth continuous laser signal with certain power as detection signal light and local oscillator light of a radar, the detection signal light is emitted to atmosphere to be detected through the light path control and transceiving module, and the local oscillator light enters the balance detection module; then, the detection signal enters the balance detection module after the backscattering signal of the atmospheric aerosol particle is received by the optical path control and transceiving module, is mixed with the local oscillator light, and converts the mixed light signal into an electric signal; and the signal processing module processes the frequency mixing heterodyne signal to obtain the Doppler frequency shift, and then the visual direction and wind speed information of the target is obtained through correlation calculation.
The continuous fiber laser module is used for generating continuous detection signal light and local oscillator light, inputting the detection signal light into the light path control and transceiving module, and inputting the local oscillator light into the balance detection module;
in the continuous fiber laser, the emitted laser is continuous laser, and the emitted laser has a continuous laser signal with a narrow line width and a certain power, that is, in this embodiment, the detection signal light and the local oscillator light are continuous laser signals with a narrow line width and a certain power;
the continuous fiber laser module comprises a laser, an acousto-optic modulator, a fiber beam splitter and a fiber amplifier, wherein the laser inputs an emergent light source into the fiber beam splitter; the optical fiber beam splitter splits the light source into a light beam A and a light beam B, the light beam A is sequentially input into the acousto-optic modulator and the optical fiber amplifier to obtain detection signal light, and the detection signal light is input into the light path control and transceiving module; and inputting the light beam B into the balance detection module, wherein the light beam B is local oscillation light, and in the implementation, the optical fiber beam splitter adopts a 1 × 2 optical fiber beam splitter.
The light path control and transceiving module is used for receiving the transmitted detection signal light, emitting the detection signal light to atmosphere to be observed, receiving backscatter echo signal light generated after the detection signal and atmospheric aerosol particles act, and inputting the backscatter echo signal light into the balance detection module; in this embodiment, a telescope in the telescope group is a zoom telescope, a detection signal amplified by an optical fiber amplifier is connected with a first port of a circulator, and then the signal is connected with the zoom telescope through a second port of the circulator, an echo signal received by the telescope is input into a second port of the circulator first, and then is connected to an input end of a 2 × 2 optical fiber coupling beam splitter from a third port;
the optical path control and receiving and transmitting module comprises an optical circulator and a telescope group, wherein the optical circulator is used for receiving the detection signal light and inputting the detection signal light to the telescope group; in this embodiment, the telescope in the telescope group is a refractive galilean structure, and the aberration of the telescope system is corrected by the cooperation of positive and negative lenses.
As shown in fig. 2 to 4, the telescope is designed in size by adopting the aperture of an input beam of 2.2mm and the aperture of an output beam of 50mm, the beam expansion ratio is 23, a lens is made of quartz glass, and the distance between lenses can be adjusted to control the emergent laser to realize beam focusing at different distances; the divergence angle of the system after collimation is less than 2.4' at each field of view. When the focal distance is within the range of 5-20m, the diameter of the light spot is less than 0.4 mm; when the focusing distance is 100m, the diameter of a light spot is less than 0.7 mm; when the focusing distance is 200m, the diameter of the light spot is less than 1mm
The telescope group is used for transmitting the detection light signal to atmosphere to be observed, receiving the detection signal, generating backward scattering echo signal light after the detection signal and the atmospheric aerosol particles react, and inputting the backward scattering echo signal light into the balance detection module through the optical circulator; the telescope group at least comprises three telescopes, and each telescope points to different directions. The focal length adjusting range of the telescope is 5 m-200 m.
When the wind speed measurement is carried out by using the continuous laser wind measuring radar, the wind speed at each position in the detection direction space contributes to the radar wind speed synthesis. The weighting function of co-located wind speeds is generally described by Lorentzian functions
In the formula, W (R) represents the weight of the wind speed at the position at the detection distance R from the radar system, kappa is a normalized constant, and omega0Representing the gaussian beam waist radius.
That is, as shown in fig. 5, although the velocity information in the whole direction contributes, the weight of the wind speed detection result at the focusing distance of the telescope beam in the synthesis is much larger than that at other positions, so that in the application, the focusing position is taken as the center, W is decreased to the range of W (f) -3dB as the detection distance of the radar system, the contribution weight of the wind speed information in the synthesis of the detection velocity is the largest near the telescope focal length, and the detection distance can be considered as the vicinity of the telescope focal length. The telescope is of Galileo type, the focal length is changed by changing the relative distance between lenses in the lens group, and the adjustment can be carried out manually or by using a mechanical device, so that the zooming of the whole optical system is realized. The focal length adjusting range is 5-200 m.
If wind speeds at different positions need to be measured, the focusing of the light beam needs to be adjusted, the lens is a zoom lens group, the focusing position of the light beam is adjusted manually or in an electromechanical mode, and the maximum detection distance is obtained through the telescope focal length adjustment range, the signal processing module performance and the wind speed synthesis weight function under the condition that the focusing distance of the light beam is large.
The balance detection module is used for receiving the backscatter echo signal light and the local oscillator light, mixing the backscatter echo signal light and the local oscillator light, and converting the mixed signal light into a Doppler frequency shift electric signal; in this embodiment, the optical fiber coupling splitter is a 2 × 2 optical fiber coupling splitter; and the dotted signals in the figure indicate the transmission of electrical signals.
The balance detection module comprises an optical coupling beam splitter and a balance detector, wherein the optical coupling beam splitter is used for receiving the B light beam and the scattered signal light, performing frequency mixing processing on the B light beam and the scattered signal light, and inputting a light signal after frequency mixing into the balance detector;
the balance detector is used for converting the optical signals after frequency mixing into Doppler frequency shift electric signals, inputting the Doppler frequency shift electric signals into the signal processing module, and the balance detection module enables the wind lidar system to carry out beat frequency processing on the atmosphere echo signals and the local oscillator light and generate Doppler frequency shift electric signals.
The signal processing module is used for acquiring the Doppler frequency shift electric signals and processing the Doppler frequency shift electric signals to obtain the visual direction and wind speed information of the atmosphere to be observed.
The signal processing module comprises a data acquisition card and a data processing board, wherein the data acquisition card is used for acquiring Doppler frequency shift electric signals obtained by processing in the balanced detector module, converting the Doppler frequency shift electric signals into digital signals and inputting the digital signals into the data processing board;
and the data processing board is used for processing the digital signals to obtain the visual direction and wind speed information of the atmosphere to be observed.
The working principle is as follows:
the narrow-linewidth continuous laser generated by the laser is divided into two beams of laser after passing through the optical fiber beam splitter, wherein one beam of laser is used as local oscillation light for coherent detection and is transmitted to the input end of the optical coupling beam splitter, and the other beam of laser is used as detection signal light, needs to be subjected to frequency shift and power amplification and is firstly input into the acousto-optic modulator.
The acousto-optic modulator carries out frequency shift on laser, then the laser is input into the optical fiber amplifier to carry out amplification processing on the average power of the laser, the amplified laser is transmitted to a first port of the circulator and then is transmitted to the zooming telescope group through a second port, a transceiver telescope of the telescope group transmits detection laser to the atmosphere, a backward scattering echo signal is generated after the detection signal and aerosol particles are acted, the backward scattering echo signal is also received by the transceiver telescope of the telescope group and then is transmitted to the second port of the circulator to be input, and the backward scattering echo signal is output to the input end of the coupling beam splitter through a third port.
At this time, it can be known that two input signals of the coupling beam splitter are local oscillation light and signal light respectively, the two input signals are transmitted to the balanced photoelectric detector through two ports after being mixed, the balanced detector detects a beat frequency signal and converts an optical signal into an electric signal, the signal has a Doppler frequency shift signal related to atmospheric wind speed, the signal is transmitted to the data acquisition card through an output port of the balanced photoelectric detector, and the data acquisition card converts an analog signal processed by the balanced photoelectric detector into a digital signal and then outputs the digital signal to the signal processing board.
And the signal processing board performs algorithm processing on the digital signals to obtain the visual direction speed information of the aerosol particles relative to the radar system. In order to obtain the wind field inversion of the three-dimensional space, at least three telescopes are generally required to be used together, the three telescopes respectively point to different detection directions, and the independent detection results of each lens are synthesized into three-dimensional wind field information through a software algorithm
Example two
The embodiment discloses a Doppler anemometry method based on continuous laser, wherein the anemometry method adopts the Doppler anemometry radar system based on continuous laser provided by the embodiment, before the wind speed is measured by adopting the method, the radar system is calibrated, and the calibration method is that a test link is built according to a principle block diagram; starting a seed source laser, and adjusting the output power of the seed source laser to be between 30 and 40 mW; starting an acousto-optic modulator, an optical fiber amplifier, a balance detector and a board card; the acousto-optic modulator shifts the frequency of the seed source laser, wherein the frequency shift is 80 MHz; adjusting the light amplifier to make the output light power of the light amplifier 200 mW; the focusing distance of the light beam of the telescope is adjusted to be 10m, a rotary turntable to be measured is placed at the focusing position of the light beam, the rotary turntable is controlled by an alternating current servo motor, the rotating speed precision error is 0.5RPM, and the radius of the rotary turntable is 13 cm. The correlation coefficient between the rotating speed test result and the actual rotating speed is 0.998, and the standard deviation is 0.151 m/s.
The method for measuring the wind speed by adopting the radar system comprises the following steps:
starting a radar system, and adjusting the laser power output by a laser to be between 30 and 40 mW;
adjusting the frequency shift of the acousto-optic modulator to the laser to 80 MHz;
adjusting the optical fiber amplifier to ensure that the output optical power of the optical fiber amplifier is 200 mW;
the focal lengths of telescopes in the telescope group are respectively adjusted to be 10m, 20m, 50m and 100m in sequence, the telescopes and the horizontal plane are shot into the atmosphere at a pitch angle of 10 degrees to carry out wind speed test, wind speed information of the atmosphere to be observed is obtained, wind speed synthesis of the continuous laser radar system is mainly contributed to the maximum by the speed at the focusing distance of the telescopes, the focusing distance of the telescopes is continuously adjustable through a lens optical-mechanical structure, and therefore the continuous laser wind measuring radar theoretically does not have a speed measuring blind area under short-distance measurement.
The above-mentioned embodiments are intended to illustrate the objects, technical solutions and advantages of the present invention in further detail, and it should be understood that the above-mentioned embodiments are merely exemplary embodiments of the present invention, and are not intended to limit the scope of the present invention, and any modifications, equivalent substitutions, improvements and the like made within the spirit and principle of the present invention should be included in the scope of the present invention.
Claims (8)
1. A Doppler wind finding radar system based on continuous laser is characterized by comprising a continuous fiber laser module, a light path control and transceiving module, a balance detection module and a signal processing module;
the continuous fiber laser module is used for generating continuous detection signal light and local oscillator light, inputting the detection signal light into the light path control and transceiving module, and inputting the local oscillator light into the balance detection module;
the light path control and transceiving module is used for receiving the transmitted detection signal light, emitting the detection signal light to atmosphere to be observed, receiving backscatter echo signal light generated after the detection signal and atmospheric aerosol particles act, and inputting the backscatter echo signal light into the balance detection module;
the balance detection module is used for receiving the backscatter echo signal light and the local oscillator light, mixing the backscatter echo signal light and the local oscillator light, and converting the mixed signal light into a Doppler frequency shift electric signal;
the signal processing module is used for acquiring the Doppler frequency shift electric signals and processing the Doppler frequency shift electric signals to obtain the visual direction and wind speed information of the atmosphere to be observed.
2. A continuous laser based doppler wind lidar system according to claim 1, wherein the continuous fiber laser module comprises a laser, an acousto-optic modulator, a fiber splitter and a fiber amplifier, the laser inputting an exit light source into the fiber splitter; the optical fiber beam splitter splits the light source into a light beam A and a light beam B, the light beam A is sequentially input into the acousto-optic modulator and the optical fiber amplifier to obtain detection signal light, and the detection signal light is input into the light path control and transceiving module; and inputting the light beam B into the balance detection module, wherein the light beam B is local oscillation light.
3. The Doppler anemometry radar system based on continuous laser according to claim 1, wherein the optical path control and transceiver module comprises an optical circulator and a telescope group, the optical circulator is used for receiving the detection signal light and inputting the detection signal light to the telescope group;
the telescope group is used for transmitting the detection light signal to atmosphere to be observed, receiving backward scattering echo signal light generated after the detection signal and atmospheric aerosol particles react, and inputting the backward scattering echo signal light into the balance detection module through the optical circulator.
4. The continuous laser based doppler wind radar system according to claim 1, wherein the balance detection module comprises an optical coupling beam splitter and a balance detector, the optical coupling beam splitter is configured to receive the B beam and the scattered signal light, mix the B beam and the scattered signal light, and input the mixed optical signal into the balance detector;
the balance detector is used for converting the mixed optical signal into a Doppler frequency shift electric signal and inputting the Doppler frequency shift electric signal into the signal processing module.
5. A continuous laser based Doppler wind radar system according to claim 4 wherein said set of telescopes comprises at least three telescopes, each telescope pointing in a different direction.
6. A continuous laser based Doppler anemometry radar system according to claim 5, wherein the focal length of said telescope is adjusted in the range of 5m to 200 m.
7. The continuous laser-based doppler wind radar system according to claim 1, wherein the signal processing module comprises a data acquisition card and a data processing board, the data acquisition card is configured to acquire a doppler shift electrical signal processed by the balanced detector module, convert the doppler shift electrical signal into a digital signal, and input the digital signal into the data processing board;
and the data processing board is used for processing the digital signals to obtain the visual direction and wind speed information of the atmosphere to be observed.
8. A Doppler anemometry method based on continuous laser, which is characterized in that the anemometry method adopts a Doppler anemometry radar system based on continuous laser according to any one of claims 1-7, and the method comprises the following steps:
starting a radar system, and adjusting the laser power output by a laser to be between 30 and 40 mW;
adjusting the frequency shift of the acousto-optic modulator to the laser to 80 MHz;
adjusting the optical fiber amplifier to ensure that the output optical power of the optical fiber amplifier is 200 mW;
the focal lengths of the telescopes in the telescope group are respectively adjusted to be 10m, 20m, 50m and 100m in sequence, and the telescopes and the horizontal plane are shot into the atmosphere at a pitch angle of 10 degrees to perform wind speed test, so that wind speed information of the atmosphere to be observed is obtained.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110873015.9A CN113391327A (en) | 2021-07-30 | 2021-07-30 | Doppler wind finding radar system and method based on continuous laser |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110873015.9A CN113391327A (en) | 2021-07-30 | 2021-07-30 | Doppler wind finding radar system and method based on continuous laser |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN113391327A true CN113391327A (en) | 2021-09-14 |
Family
ID=77622413
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202110873015.9A Pending CN113391327A (en) | 2021-07-30 | 2021-07-30 | Doppler wind finding radar system and method based on continuous laser |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN113391327A (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114019534A (en) * | 2021-11-22 | 2022-02-08 | 上海科乃特激光科技有限公司 | Wind measuring radar |
| CN114152775A (en) * | 2021-11-05 | 2022-03-08 | 安徽大学 | Deep sea hydrothermal and cold spring nozzle flow velocity measuring instrument based on optical Doppler and use method of instrument |
| CN115508853A (en) * | 2022-11-04 | 2022-12-23 | 青岛镭测创芯科技有限公司 | Speed measuring device, laser speed measuring method, system and medium |
| CN116577899A (en) * | 2023-07-13 | 2023-08-11 | 中国科学技术大学 | Focal length adjusting system applied to wind-measuring laser radar |
| CN117031500A (en) * | 2023-05-11 | 2023-11-10 | 珠海光恒科技有限公司 | Light source system and method for long-distance all-fiber laser Doppler wind-finding radar |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101034162A (en) * | 2007-02-13 | 2007-09-12 | 中国科学院武汉物理与数学研究所 | Synthesis multifunctional middle and upper atmosphere exploration laser radar |
| CN201464659U (en) * | 2009-03-04 | 2010-05-12 | 中国科学院武汉物理与数学研究所 | All-time full-elevation atmosphere detection lidar |
| CN104898108A (en) * | 2015-05-19 | 2015-09-09 | 浙江大学 | Atmosphere remote sensing laser radar optical receiving device based on telescope arrays |
| CN106940444A (en) * | 2017-02-27 | 2017-07-11 | 南京红露麟激光雷达科技有限公司 | Coherent Doppler wind-observation laser radar based on microwave differential gain |
| CN109085602A (en) * | 2018-09-19 | 2018-12-25 | 北京聚恒博联科技有限公司 | A kind of atmospheric remote sensing laser radar system |
| CN112859112A (en) * | 2021-01-11 | 2021-05-28 | 南京晓庄学院 | Wind temperature detection laser radar and method based on rotating Raman-Doppler mechanism |
-
2021
- 2021-07-30 CN CN202110873015.9A patent/CN113391327A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101034162A (en) * | 2007-02-13 | 2007-09-12 | 中国科学院武汉物理与数学研究所 | Synthesis multifunctional middle and upper atmosphere exploration laser radar |
| CN201464659U (en) * | 2009-03-04 | 2010-05-12 | 中国科学院武汉物理与数学研究所 | All-time full-elevation atmosphere detection lidar |
| CN104898108A (en) * | 2015-05-19 | 2015-09-09 | 浙江大学 | Atmosphere remote sensing laser radar optical receiving device based on telescope arrays |
| CN106940444A (en) * | 2017-02-27 | 2017-07-11 | 南京红露麟激光雷达科技有限公司 | Coherent Doppler wind-observation laser radar based on microwave differential gain |
| CN109085602A (en) * | 2018-09-19 | 2018-12-25 | 北京聚恒博联科技有限公司 | A kind of atmospheric remote sensing laser radar system |
| CN112859112A (en) * | 2021-01-11 | 2021-05-28 | 南京晓庄学院 | Wind temperature detection laser radar and method based on rotating Raman-Doppler mechanism |
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114152775A (en) * | 2021-11-05 | 2022-03-08 | 安徽大学 | Deep sea hydrothermal and cold spring nozzle flow velocity measuring instrument based on optical Doppler and use method of instrument |
| CN114152775B (en) * | 2021-11-05 | 2024-01-12 | 安徽大学 | Deep sea hot liquid cold spring nozzle flow velocity measuring instrument based on optical Doppler and using method of instrument |
| CN114019534A (en) * | 2021-11-22 | 2022-02-08 | 上海科乃特激光科技有限公司 | Wind measuring radar |
| CN115508853A (en) * | 2022-11-04 | 2022-12-23 | 青岛镭测创芯科技有限公司 | Speed measuring device, laser speed measuring method, system and medium |
| CN117031500A (en) * | 2023-05-11 | 2023-11-10 | 珠海光恒科技有限公司 | Light source system and method for long-distance all-fiber laser Doppler wind-finding radar |
| CN117031500B (en) * | 2023-05-11 | 2024-02-13 | 珠海光恒科技有限公司 | Light source system and method for long-distance all-fiber laser Doppler wind-finding radar |
| CN116577899A (en) * | 2023-07-13 | 2023-08-11 | 中国科学技术大学 | Focal length adjusting system applied to wind-measuring laser radar |
| CN116577899B (en) * | 2023-07-13 | 2023-11-28 | 中国科学技术大学 | Focal length adjusting system applied to wind-measuring laser radar |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN113391327A (en) | Doppler wind finding radar system and method based on continuous laser | |
| JP5475755B2 (en) | Laser doppler speedometer | |
| US9026278B2 (en) | LDV system for measuring wind at high altitude | |
| Diao et al. | All fiber pulsed coherent lidar development for wind profiles measurements in boundary layers | |
| CN112711031B (en) | Improved quasi-blind area-free Doppler coherent laser radar wind speed measurement system and method | |
| CN108802425A (en) | A kind of airborne measuring wind speed laser radar system | |
| US20050002013A1 (en) | Coherent laser radar apparatus | |
| CN109990843B (en) | Method and device for monitoring flight speed and environmental parameters of aircraft | |
| US4875770A (en) | Wind shear detector | |
| CN110161280B (en) | Hybrid detection Doppler laser radar wind speed measurement system and measurement method thereof | |
| CN106684694A (en) | Laser beam splitting device used for multi-line laser radar | |
| CN112269190A (en) | Split type automatic zooming 360-degree rotating optical wedge scanning laser wind measuring radar | |
| CN111398993B (en) | Non-blind area pulse coherent wind lidar system | |
| CN110531378B (en) | Continuous wave laser coherent wind-finding radar system of wind turbine generator | |
| CN112698356B (en) | Non-blind area pulse coherent wind-measuring laser radar system based on multi-aperture transceiving | |
| CN215297681U (en) | Variable-focus high signal-to-noise ratio wind lidar system | |
| EP2795344B1 (en) | A single laser all-fibre based optical sensor and switching system and method for measuring velocity in atmospheric air flow | |
| CN216485509U (en) | Hand-held type anemometry lidar based on single beam detection | |
| CN206461219U (en) | A kind of laser beam splitter device for multi-line laser radar | |
| CN214151058U (en) | Dual-beam laser radar wind field detection device | |
| Zhang et al. | Vehicle-mounted validations of a 1.55-μ m all-fiber continuous-wave coherent laser radar for measuring aircraft airspeed | |
| CN116736336B (en) | Atmospheric data same-path synchronous detection system and method | |
| Kameyama et al. | All-fiber coherent Doppler lidar system for wind sensing | |
| CN202083800U (en) | Three-wavelength real-time calibration laser radar apparatus | |
| CN219936106U (en) | Laser radar system |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| RJ01 | Rejection of invention patent application after publication | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20210914 |