CN205176276U - Fine relevant anemometry laser radar of full gloss - Google Patents
Fine relevant anemometry laser radar of full gloss Download PDFInfo
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- CN205176276U CN205176276U CN201520927158.3U CN201520927158U CN205176276U CN 205176276 U CN205176276 U CN 205176276U CN 201520927158 U CN201520927158 U CN 201520927158U CN 205176276 U CN205176276 U CN 205176276U
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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
The utility model relates to an anemometry laser radar technical field, more specifically relates to one kind and uses the photonic crystal laser instrument as the fine relevant anemometry laser radar of full gloss of light source, including photonic crystal laser instrument, optic fibre circulator device, light detecting device, transmission / receipt optical devices and signal processing and laser -driven device, the utility model discloses a carry out linear modulation to signal processing and the drive current that the laser -driven device offered the photonic crystal laser instrument to obtain great fundamental frequency signal and the echo signal of frequency displacement volume, carry out the mixing with fundamental frequency signal and echo signal and obtain the difference frequency signal, handle and calculate the difference frequency signal, promptly radial wind speed of measurable and wind direction. The utility model discloses not only the complexity is low, with low costs, and the SNR of the laser signal launched moreover is higher, can record the radial wind speed and the wind direction of high accuracy.
Description
Technical field
The utility model relates to anemometry laser radar technical field, more specifically, relates to a kind of photon crystal laser that uses as the all-fiber coherent anemometry laser radar of light source.
Background technology
Anemometry laser radar technology application Doppler effect, carrys out measuring wind by the frequency displacement of measuring reflection lasering beam.This technology is mainly divided into two large classes: direct measuring method and coherent measurement method, because direct measuring method uses F-P etalon to measure Doppler shift usually, need the optical system of relative complex, therefore coherent measurement method more and more receives everybody concern.
Coherent measurement method, by the echoed signal after fundamental frequency signal and frequency displacement is carried out mixing, obtains wind speed through signal processing circuit after obtaining difference frequency signal again.Because Doppler shift amount is smaller at low wind speeds, the difference on the frequency of the echoed signal after fundamental frequency signal and frequency displacement is very little, be not easy to obtain, common way increases difference on the frequency between the echo after fundamental frequency signal and frequency displacement by acousto-optic frequency modulation or other additional frequency modulation ways, this not only adds complexity and the cost of system, increase load to whole system, and also reduce the signal to noise ratio (S/N ratio) of signal, and then reduce the precision of the wind speed recorded.
Summary of the invention
For the shortcoming of prior art, the utility model aims to provide a kind of all-fiber coherent anemometry laser radar, not only complexity is low, cost is low for this anemometry laser radar, and the signal to noise ratio (S/N ratio) of the laser signal launched is higher, can record high-precision radial wind speed and radial wind direction.
For achieving the above object, the technical solution adopted in the utility model is:
A kind of all-fiber coherent anemometry laser radar is provided, comprises photon crystal laser, fiber annular apparatus, light detection device, transmitting/receiving optical devices and signal transacting and laser driving apparatus, described photon crystal laser Emission Lasers signal, the wavelength of described laser signal carries out linear modulation within the specific limits according to the change of drive current, described fiber annular apparatus comprises three ports, laser signal transmission to the first port that photon crystal laser is launched, reflection is there is through the 3rd port transmission to light detection device in a part for the laser signal inputted by the first port in the second port end, using this part laser signal as fundamental frequency signal, the another part of the laser signal inputted by the first port focuses on sensing point through it through the second port transmission to transmitting/receiving optical devices, the laser signal reflected by sensing point is inputted through the 3rd port transmission to light detection device by the second port as echoed signal, described light detection device is used for that described fundamental frequency signal and echoed signal are carried out mixing and obtains difference frequency signal, described signal transacting and laser driving apparatus provide drive current to photon crystal laser and the difference frequency signal being received from light detection device are processed to the radial wind speed and wind direction that obtain sensing point.
In such scheme, by using photon crystal laser as laser signal source, and linear modulation is carried out to the drive current that signal transacting and laser driving apparatus are supplied to photon crystal laser, laser signal after making photon crystal laser directly launch modulation, fiber annular apparatus is utilized to obtain fundamental frequency signal and the echoed signal of this laser signal, utilizing light detection device to carry out mixing to fundamental frequency signal and echoed signal and obtain difference frequency signal, the radial wind speed of sensing point and the measurement of wind direction can be realized by calculating this difference frequency signal.Not only complexity is low, cost is low for this all-fiber coherent anemometry laser radar, and the signal to noise ratio (S/N ratio) of the laser signal launched is higher, can record high-precision radial wind speed and wind direction.
Preferably, in order to increase the difference on the frequency between fundamental frequency signal and echoed signal further, to improve the precision of radial wind speed and the wind direction recorded, the drive current that signal transacting and laser driving apparatus provide to photon crystal laser is modulated according to continuous print triangular wave.
Preferably, this all-fiber coherent anemometry laser radar also comprises the optical amplification device low power laser signal that photon crystal laser is launched being amplified to power demand optical fiber.The difference on the frequency that can further increase between fundamental frequency signal and echoed signal is set like this, contributes to the precision improving radial wind speed and the wind direction recorded.
Preferably, described optical amplification device is EDFA optical amplification device.EDFA optical amplification device not only cost is low, and during amplifying laser signal, noise is low, can ensure the signal to noise ratio (S/N ratio) of laser signal.
Preferably, described sensing point is the focal position of transmitting/receiving optical devices.
Preferably, described laser signal transmits in single-mode fiber.Dispersion Characteristic of Monomode Fiber is little, can ensure the frequency of the laser signal transmitted, contribute to the precision improving radial wind speed and the wind direction recorded.
Compared with prior art, the beneficial effects of the utility model are:
A kind of all-fiber coherent anemometry laser radar of the utility model, by using photon crystal laser as light source, direct frequency modulated is carried out to its laser beam sent, not only complexity is low, cost is low, and the signal to noise ratio (S/N ratio) of the laser signal launched is higher, can record high-precision radial wind speed and wind direction; Modulating according to continuous print triangular wave by being supplied to photon crystal laser drive current to signal transacting and laser driving apparatus, the precision of radial wind speed and the wind direction recorded can be improved further; By using the form of all-fiber to carry out Signal transmissions, the signal to noise ratio (S/N ratio) of signal transmission can be ensured, in order to avoid reduce the precision affecting radial wind speed and the wind direction recorded because of signal to noise ratio (S/N ratio).
Accompanying drawing explanation
Fig. 1 is the structural representation of the utility model embodiment.
Fig. 2 is the oscillogram of wind detection method fundamental frequency signal, echoed signal and difference frequency signal with the wind time in the utility model.
Fig. 3 is the oscillogram of wind detection method fundamental frequency signal, echoed signal and difference frequency signal when contrary wind in the utility model.
Embodiment
Below in conjunction with embodiment, the utility model is further described.Wherein, accompanying drawing only for exemplary illustration, expression be only schematic diagram, but not pictorial diagram, can not be interpreted as the restriction to this patent; In order to embodiment of the present utility model is described better, some parts of accompanying drawing have omission, zoom in or out, and do not represent the size of actual product; For a person skilled in the art, in accompanying drawing, some known features and explanation thereof may be omitted is understandable.
The corresponding same or analogous parts of same or analogous label in the accompanying drawing of the utility model embodiment, in description of the present utility model, it will be appreciated that, if have term " on ", D score, " left side ", orientation or the position relationship of the instruction such as " right side " are based on orientation shown in the drawings or position relationship, only the utility model and simplified characterization for convenience of description, instead of indicate or imply that the device of indication or element must have specific orientation, with specific azimuth configuration and operation, therefore the term of position relationship is described only for exemplary illustration in accompanying drawing, the restriction to this patent can not be interpreted as, for the ordinary skill in the art, the concrete meaning of above-mentioned term can be understood as the case may be.
Embodiment
The structural representation of a kind of all-fiber coherent anemometry laser radar of the present embodiment as shown in Figure 1, comprises photon crystal laser 1, fiber annular apparatus 4, light detection device 6, transmitting/receiving optical devices 5 and signal transacting and laser driving apparatus 7, photon crystal laser 1 Emission Lasers signal, the wavelength of laser signal carries out linear modulation within the specific limits according to the change of drive current, fiber annular apparatus 4 comprises three ports, laser signal transmission to the first port 41 that photon crystal laser 1 is launched, reflection is there is and transfers to light detection device 6 through the 3rd port 43 in a part for the laser signal inputted by the first port 41 in the second port 42 end, using this part laser signal as fundamental frequency signal, the another part of the laser signal inputted by the first port 41 transfers to transmitting/receiving optical devices 5 through the second port 42 and focuses on sensing point 8 through it, the laser signal reflected by sensing point 8 to be inputted by the second port 42 as echoed signal and transfers to light detection device 6 through the 3rd port 43, light detection device 6 obtains difference frequency signal for fundamental frequency signal and echoed signal are carried out mixing, signal transacting and laser driving apparatus 7 provide drive current and the difference frequency signal being received from light detection device 6 are processed to the radial wind speed and wind direction that obtain sensing point 8 to photon crystal laser 1.Sensing point 8 in the present embodiment is the focal position of transmitting/receiving optical devices 5, and the strongest at the signal of the focal position place laser of transmitting/receiving optical devices 5, the loss of signal is minimum.
When surveying wind, the drive current that signal transacting and laser driving apparatus 7 are supplied to photon crystal laser 1 is modulated according to continuous print triangular wave, the laser signal after making photon crystal laser 1 send modulation, laser signal transmission after modulation is to the first port 41 of fiber annular apparatus 4, reflection is there is and transfers to light detection device 6 through the 3rd port 43 in a part for the laser signal inputted by the first port 41 in the second port 42 end, using this part laser signal as fundamental frequency signal, the another part of the laser signal inputted by the first port 41 transfers to transmitting/receiving optical devices 5 through the second port 42 and focuses on sensing point 8 through it, the laser signal reflected by sensing point 8 to be inputted by the second port 42 as echoed signal and transfers to light detection device 6 through the 3rd port 43, fundamental frequency signal and echoed signal are carried out mixing by light detection device 6, can obtain difference frequency signal, and Fig. 2 is the oscillogram of the difference frequency signal of situation with the wind, and Fig. 3 is the oscillogram of the difference frequency signal of situation against the wind, signal transacting and laser driving apparatus 7 receive this difference frequency signal and process it and calculate, and can draw the numerical value of Doppler shift, calculate the radial wind speed of sensing point 8, then according to the waveform of difference frequency signal, can judge radial wind direction.By the whole measuring process that circulates, the real-time monitoring to the radial wind speed of sensing point 8 and wind direction can being realized, by using different transmitting/receiving optical devices 5, radial wind speed and the wind direction at sensing point 8 place of different distance can be measured.Not only complexity is low, cost is low for the utility model, by carrying out direct continuous print triangular modulation to the drive current of photon crystal laser 1, make photon crystal laser 1 launch the higher laser signal of signal to noise ratio (S/N ratio), the measurement of high-precision radial wind speed and wind direction can be realized.
Wherein, the present embodiment is also provided with optical amplification device 2 between photon crystal laser 1 and fiber annular apparatus, the low power laser signal that photon crystal laser 1 is launched by optical amplification device 2 is amplified to power demand optical fiber, this further can increase the difference on the frequency between fundamental frequency signal and echoed signal, contributes to the precision improving radial wind speed and the radial wind direction recorded.This optical amplification device 2 is EDFA optical amplification device, and EDFA optical amplification device not only cost is low, and during amplifying laser signal, noise is low, can ensure the signal to noise ratio (S/N ratio) of laser signal.
In addition, laser signal transmits in single-mode fiber 3, and single-mode fiber 3 dispersion is little, can ensure the frequency of the laser signal transmitted, contribute to the precision improving radial wind speed and the wind direction recorded.
Obviously, above-described embodiment of the present utility model is only for the utility model example is clearly described, and is not the restriction to embodiment of the present utility model.For those of ordinary skill in the field, can also make other changes in different forms on the basis of the above description.Here exhaustive without the need to also giving all embodiments.All do within spirit of the present utility model and principle any amendment, equivalent to replace and improvement etc., within the protection domain that all should be included in the utility model claim.
Claims (6)
1. an all-fiber coherent anemometry laser radar, is characterized in that, comprises photon crystal laser (1), fiber annular apparatus (4), light detection device (6), transmitting/receiving optical devices (5) and signal transacting and laser driving apparatus (7), described photon crystal laser (1) Emission Lasers signal, the wavelength of described laser signal carries out linear modulation within the specific limits according to the change of drive current, described fiber annular apparatus (4) comprises three ports (41, 42, 43), laser signal transmission to the first port (41) that photon crystal laser (1) is launched, reflection is there is and transfers to light detection device (6) through the 3rd port (43) in a part for the laser signal inputted by the first port (41) in the second port (42) end, using this part laser signal as fundamental frequency signal, the another part of the laser signal inputted by the first port (41) transfers to transmitting/receiving optical devices (5) through the second port (42) and focuses on sensing point (8) through it, the laser signal reflected by sensing point (8) transfers to light detection device (6) by the second port (42) input through the 3rd port (43) as echoed signal, described light detection device (6) obtains difference frequency signal for described fundamental frequency signal and echoed signal are carried out mixing, described signal transacting and laser driving apparatus (7) provide drive current to photon crystal laser (1) and carry out to the difference frequency signal being received from light detection device (6) radial wind speed and the wind direction that process obtains sensing point (8).
2. all-fiber coherent anemometry laser radar according to claim 1, is characterized in that, the drive current that described signal transacting and laser driving apparatus (7) provide to photon crystal laser (1) is modulated according to continuous print triangular wave.
3. all-fiber coherent anemometry laser radar according to claim 1, is characterized in that, also comprises the optical amplification device (2) the low power laser signal that described photon crystal laser (1) is launched being amplified to power demand optical fiber.
4. all-fiber coherent anemometry laser radar according to claim 3, is characterized in that, described optical amplification device (2) is EDFA optical amplification device.
5. all-fiber coherent anemometry laser radar according to claim 1, is characterized in that, the focal position that described sensing point (8) is transmitting/receiving optical devices (5).
6. the all-fiber coherent anemometry laser radar according to any one of claim 1 to 5, is characterized in that, described laser signal transmits in single-mode fiber (3).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520927158.3U CN205176276U (en) | 2015-11-19 | 2015-11-19 | Fine relevant anemometry laser radar of full gloss |
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| CN201520927158.3U CN205176276U (en) | 2015-11-19 | 2015-11-19 | Fine relevant anemometry laser radar of full gloss |
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| CN205176276U true CN205176276U (en) | 2016-04-20 |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105445753A (en) * | 2015-11-19 | 2016-03-30 | 北京理工大学珠海学院 | All-fiber coherent wind lidar and wind measurement method thereof |
| CN106646422A (en) * | 2016-09-28 | 2017-05-10 | 成都凯天电子股份有限公司 | Preprocessing system for reinforcing signal-to-noise ratio of Doppler frequency shift signal of coherent wind finding radar |
| CN113176581A (en) * | 2021-03-15 | 2021-07-27 | 北京华信科创科技有限公司 | Doppler pulse laser wind measuring device, method and system |
-
2015
- 2015-11-19 CN CN201520927158.3U patent/CN205176276U/en not_active Withdrawn - After Issue
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105445753A (en) * | 2015-11-19 | 2016-03-30 | 北京理工大学珠海学院 | All-fiber coherent wind lidar and wind measurement method thereof |
| CN106646422A (en) * | 2016-09-28 | 2017-05-10 | 成都凯天电子股份有限公司 | Preprocessing system for reinforcing signal-to-noise ratio of Doppler frequency shift signal of coherent wind finding radar |
| CN106646422B (en) * | 2016-09-28 | 2020-06-09 | 成都凯天电子股份有限公司 | Preprocessing system for enhancing signal-to-noise ratio of Doppler frequency shift signal of coherent wind radar |
| CN113176581A (en) * | 2021-03-15 | 2021-07-27 | 北京华信科创科技有限公司 | Doppler pulse laser wind measuring device, method and system |
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Legal Events
| Date | Code | Title | Description |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| AV01 | Patent right actively abandoned | ||
| AV01 | Patent right actively abandoned |
Granted publication date: 20160420 Effective date of abandoning: 20171003 |