CN108227039B - Atmospheric turbulence intensity and visibility measuring device - Google Patents
Atmospheric turbulence intensity and visibility measuring device Download PDFInfo
- Publication number
- CN108227039B CN108227039B CN201711318236.XA CN201711318236A CN108227039B CN 108227039 B CN108227039 B CN 108227039B CN 201711318236 A CN201711318236 A CN 201711318236A CN 108227039 B CN108227039 B CN 108227039B
- Authority
- CN
- China
- Prior art keywords
- unit
- laser
- atmospheric
- lens
- visibility
- 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.)
- Active
Links
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01W—METEOROLOGY
- G01W1/00—Meteorology
- G01W1/02—Instruments for indicating weather conditions by measuring two or more variables, e.g. humidity, pressure, temperature, cloud cover or wind speed
Abstract
The invention discloses an atmospheric turbulence intensity and visibility measuring device which comprises an optical transmitting unit, an optical receiving unit, an instrument control unit and a data receiving unit. The optical transmitting unit comprises a semiconductor laser transmitter, a chopper, a collimating lens group, a control power supply, a light source driving circuit and an automatic light power control circuit, the light receiving unit comprises a short-focal-length laser receiving component, a camera system, a wind speed and direction measuring system, a temperature sensor, a pressure sensor, a humidity sensor and a temperature control module, and the instrument control and data receiving unit comprises a data preprocessing unit, an A/D conversion unit, an image acquisition unit, an image processing unit and a display unit which are sequentially connected. The invention adopts a transmission type measurement method to synchronously acquire the atmospheric visibility and the atmospheric turbulence intensity, and simultaneously increases a temperature, pressure, humidity, wind speed and wind direction measurement system to form a meteorological element comprehensive measurement system.
Description
Technical Field
The invention relates to the field of atmospheric environment detection, in particular to an atmospheric turbulence intensity and visibility measuring device.
Background
Atmospheric transparency and atmospheric turbulence are two basic research objects in atmospheric science, and are important meteorological factors in air quality forecasting, climate environment mode and boundary layer research. For the transparency of the atmosphere, the visual reflection is the visibility of the atmosphere, which is not only a meteorological element related to safety guarantee in the field of transportation, but also an important characteristic quantity for reflecting the pollution degree of the atmosphere in the field of environmental monitoring; also, refractive index fluctuations due to atmospheric turbulence can destroy the coherence of light, causing blurring of the optical image, which is a problem in astronomical observation. On the one hand, the atmospheric turbulence drives the aerosol particles to move, and on the other hand, the aerosol particles drag the turbulent air mass to move, and the relationship between the atmospheric turbulence and the drag is that when detecting the atmospheric visibility (extinction coefficient) and the characteristics of the atmospheric turbulence, the interaction between the atmospheric turbulence and the atmospheric turbulence should be considered, which is an important link in researching, monitoring and forecasting the pollutant diffusion distribution, so that the overall air mass extinction is a factor to be considered, and the existing measuring instrument ignores the problem.
Disclosure of Invention
The invention aims to overcome the defects in the prior art, and provides an atmospheric turbulence intensity and visibility measuring device which can synchronously acquire atmospheric visibility and atmospheric turbulence intensity.
The technical scheme is as follows: to achieve the above technical object, the atmospheric turbulence intensity and visibility measuring device of the present invention includes an optical transmitting unit, an optical receiving unit, an instrument control and data receiving unit, wherein:
the optical emission unit comprises a semiconductor laser emitter, a chopper, a collimating lens group, a control power supply, a light source driving circuit and an automatic light power control circuit, wherein the control power supply, the light source driving circuit and the automatic light power control circuit are sequentially connected, laser from the semiconductor laser emitter emits laser beams through the light source driving circuit and the automatic light power control circuit, and the laser beams are subjected to light frequency modulation through the chopper and are used for measuring turbulence of turbulence in the atmosphere; the light receiving unit comprises a short-focal-length laser receiving component, a camera system, a wind speed and direction measuring system, a temperature sensor, a pressure sensor, a humidity sensor and a temperature control module;
the instrument control and data receiving unit comprises a data preprocessing unit, an A/D conversion unit, an image acquisition unit, an image processing unit and a display unit which are sequentially connected, wherein the laser tube bundle processed by the optical transmitting unit is received by the camera system after passing through the short-focal-length laser receiving assembly, and is processed by the data preprocessing unit, the A/D conversion unit, the image acquisition unit and the image processing unit in sequence, and finally the result is displayed on the display module.
The control power supply is respectively connected with the temperature sensor, the humidity sensor, the pressure sensor, the camera system and the wind power and wind direction measuring system.
Specifically, the laser wavelength emitted by the semiconductor laser transmitter is 600-900nm, the power is 15-45w, the bandwidth is 1-5nm, preferably, the laser wavelength is 808nm, the power is 20w, the bandwidth is 2nm, the semiconductor laser transmitter connects the laser and the chopper through a multimode optical fiber, preferably, the diameter of the multimode optical fiber is 400 μm, the length is 5m, and the optical fiber output numerical aperture is 0.18-0.23, preferably 0.22. The numerical aperture of the output of the optical fiber characterizes the light receiving capacity of the end face of the optical fiber, and the light receiving capacity of the optical fiber and the influence on the mode dispersion are considered, so that the numerical aperture is unsuitable for being too large or too small.
The collimating lens group consists of a double-cemented collimating lens and a double-lens collimating lens.
The double-glued collimating lens comprises two lenses glued with each other, wherein the thickness of the first lens is 12mm, the material is H-QK3L, the thickness of the second lens is 6mm, the material is SF5, and the divergence angle RMS value of emergent light is 0.998 mu m. The double-gluing collimating lens has small volume and compact structure.
The double-lens collimating lens comprises two convex lenses with the thickness of 6.7mm and 13mm respectively, the glass materials are BK7, the divergence angle RMS value of emergent light is 0.904 mu m, and the distance between the lenses is 100-125 mm. The dual-lens collimating lens has good collimating effect and high collimating degree. Preferably, the distance between the two convex lenses is 125mm.
The short-focal-length laser receiving component consists of a transmission lens with a focal length of 150-450mm, an effective aperture D of 30-50mm, a focal length of 300mm, an effective aperture D of 30mm, a CCD camera with a resolution of 640 x 480, a pixel size of 10.6 mu m and a frame frequency of 60Hz, preferably, a transmission lens with a focal length of 300mm, an effective aperture D of 30mm, a CCD camera with a resolution of 640 x 480, a pixel size of 10.6 mu m and a frame frequency of 60Hz, and the integration time of the CCD camera is 0.35ms.
The camera system is a camera and is used for shooting the visibility condition for 24 hours; the wind speed and direction measuring system is a three-blade wind speed and direction measuring instrument and is used for detecting real-time wind speed and wind direction; the temperature sensor, the pressure sensor and the humidity sensor are respectively used for detecting real-time atmospheric temperature, atmospheric pressure and atmospheric humidity. The three sensors are independent of a receiving end detection module (CCD system) and avoid the influence of a receiving end temperature control system.
The temperature control module is independent of the temperature sensor, the pressure sensor and the humidity sensor, is arranged inside the short-focus laser receiving assembly and is used for controlling the temperature of the short-focus laser receiving assembly.
And a heat dissipation device is arranged on the outer sides of the semiconductor laser transmitter and the short-focal-length laser receiving component.
And the outer sides of the optical transmitting unit, the optical receiving unit, the instrument control unit and the data receiving unit are respectively provided with a shell.
In particular, when the device is applied, a laser light source at a transmitting end transmits a laser beam with the wavelength of 808nm through a light source driving circuit and an automatic light power control circuit, and the frequency of the laser beam is modulated to 10kHz through a chopper, so that the device aims to measure turbulence in the atmosphere. The laser beam is received by the receiving end after being secondarily collimated by the collimating lens group. The light beam is received by the CCD camera after passing through the focusing lens group, is transmitted to the image acquisition card of the PC after passing through the data preprocessing unit and the A/D conversion, is acquired and processed by the image monitoring software and the image processing software, and finally, the result is displayed on the display module.
In the experiment, the gray values of the speckle images are summed, and then the background gray values are subtracted to obtain the speckle energy which is characterized by the image gray values, so that the light intensity received by the receiving unit is obtained approximately; the centroid of the CCD light spot is obtained through image processing software, so that the change of the arrival angle of the light beam is obtained, and the fluctuation variance of the arrival angle is obtained. And then calculating the result according to the visibility formula, the atmospheric refractive index structural constant light intensity fluctuation principle and the arrival angle fluctuation principle formula respectively.
The beneficial effects are that: compared with the prior art, the invention adopts a transmission type measurement method to synchronously acquire the atmospheric visibility and the atmospheric turbulence intensity, and in addition, a temperature, pressure, humidity, wind speed and wind direction measurement system is added on the basis, so that a meteorological element comprehensive measurement system is formed. The method has important significance for atmospheric environment monitoring, air quality forecasting, radiation climate and environmental effect research, in addition, the transmitting end transmits a collimated laser beam through the collimating lens to be received by the short-focal-length laser receiving assembly of the receiving end, and the measuring results of atmospheric visibility and atmospheric turbulence intensity can be obtained through the processing of the image acquisition unit and the image processing unit, so that the relation between the two meteorological elements is analyzed, namely the extinction effect of the whole air mass is considered.
Drawings
FIG. 1 is a schematic diagram of the structure of the device of the present invention;
FIG. 2 is a schematic diagram of the principle connection of the device of the present invention, wherein 1 is a control power supply, 2 is a light source driving the circuit, 3 is an automatic light power control circuit, 4 is a laser light source, 5 is a chopper, 6 is a collimating lens group, 7 is a focusing lens group, 8 is a CCD camera, 9 is a temperature control module, 10 is a temperature sensor, 11 is a humidity sensor, 12 is a pressure sensor, 13 is an imaging system, 14 is a wind direction measuring system, 15 is a data preprocessing unit, 16 is an A/D conversion module, 17 is an image acquisition card, 18 is image monitoring software, 19 is image processing software, and 20 is a display module;
FIG. 3 is a graph of the results of measurements made using the apparatus of the present invention.
Detailed Description
The invention will be further illustrated by the following examples in conjunction with the specific drawings.
As shown in fig. 1, the present invention proposes an atmospheric turbulence intensity and visibility measuring device, comprising an optical transmitting unit, an optical receiving unit, an instrument control and data receiving unit, the outer sides of which are respectively provided with a housing, wherein:
the optical emission unit comprises a semiconductor laser emitter, a chopper, a collimating lens group, a control power supply, a light source driving circuit and an automatic light power control circuit, wherein the control power supply, the light source driving circuit and the automatic light power control circuit are sequentially connected, the laser wavelength emitted by the semiconductor laser emitter is 808nm, the power is 20w, the bandwidth is 2nm, the semiconductor laser emitter connects the laser with the chopper through a multimode optical fiber with the diameter of 400 mu m and the length of 5m, the maximum output frequency of the chopper is 110kHz, and the output numerical aperture of the optical fiber is 0.22. Laser from semiconductor laser emitter sends laser beam through light source driving circuit and automatic light power control circuit, and laser beam carries out optical frequency modulation through chopper for measuring the disturbance of atmospheric turbulence.
The collimating lens group consists of a double-cemented collimating lens and a double-lens collimating lens. The double-glued collimating lens comprises two lenses, wherein the thickness of the first lens is 12mm, the material is H-QK3L, the thickness of the second lens is 6mm, the material is SF5, and the divergence angle RMS value of emergent light is 0.998 mu m. The dual-lens collimating lens comprises two convex lenses with the thickness of 6.7mm and 13mm, wherein the glass materials are BK7, the divergence angle RMS value of emergent light is 0.904 mu m, and the distance between the lenses is 125mm.
The light receiving unit comprises a short-focus laser receiving assembly, a camera system, a wind speed and direction measuring system, a temperature sensor, a pressure sensor, a humidity sensor and a temperature control module, wherein a control power supply is respectively connected with the temperature sensor, the humidity sensor, the pressure sensor, the camera system and the wind speed and direction measuring system, the short-focus laser receiving assembly consists of a transmission lens with a focal length of 300mm and an effective aperture D of 30mm, and a CCD camera with a resolution of 640 multiplied by 480, a pixel size of 10.6 mu m and a frame frequency of 60Hz, and the integration time of the CCD camera is 0.35ms. The camera system is a camera and is used for shooting the visibility condition for 24 hours. The wind speed and direction measuring system is a three-blade wind speed and direction measuring instrument and is arranged on the outer side of the outer shell of the optical transmitting unit and used for detecting real-time wind speed and wind direction. The temperature sensor, the pressure sensor and the humidity sensor are respectively used for detecting real-time atmospheric temperature, atmospheric pressure and atmospheric humidity. The temperature control module is independent of the temperature sensor, the pressure sensor and the humidity sensor, is arranged inside the short-focal-length laser receiving assembly and is used for controlling the temperature of a detection system of the short-focal-length laser assembly, namely the temperature of the CCD camera.
The instrument control and data receiving unit comprises a data preprocessing unit, an A/D conversion unit, an image acquisition unit, an image processing unit and a display unit which are sequentially connected, wherein the image acquisition unit comprises a PC and an image acquisition card, and the image acquisition card is further processed through image monitoring software and image processing software respectively.
A laser light source from a semiconductor laser emitter emits a laser beam with the wavelength of 808nm through a light source driving circuit and an automatic light power control circuit, and the frequency of the laser beam is modulated to 10kHz through a chopper, so that turbulence in the atmosphere is measured. The laser beam is received by the receiving end after being secondarily collimated by the collimating lens group. The light beam is received by the CCD camera after passing through the focusing lens group, is transmitted to the image acquisition card of the PC after passing through the data preprocessing unit and the A/D conversion, is acquired and processed by the image monitoring software and the image processing software, and finally the result is displayed by the 14 display module.
In the experiment, the gray values of the speckle images are summed, and then the background gray values are subtracted to obtain the speckle energy which is characterized by the image gray values, so that the light intensity received by the receiving unit is obtained approximately; the centroid of the CCD light spot is obtained through image processing software, so that the change of the arrival angle of the light beam is obtained, and the fluctuation variance of the arrival angle is obtained. And then calculating the result according to the visibility formula, the atmospheric refractive index structural constant light intensity fluctuation principle and the arrival angle fluctuation principle formula respectively.
Specifically, the device of the invention performs the calculation by the following method:
(1) Visibility measurement principle: the attenuation of parallel light in the atmosphere, according to the Bragg-Lambert law, can be expressed by the following formula:
F＝F 0 e -σL
wherein sigma is an extinction coefficient, F 0 The luminous flux at l=0, i.e., the initial luminous flux. If the meteorological optical distance, i.e. the distance travelled by the luminous flux decaying to 5%, is expressed as MOR
Is obtained by the following two formulas: />
(2) Atmospheric refractive index structure constant measurement principle:
a. light intensity voltammetry
According to the theory of light transmission, a spherical wave with wavelength lambda propagates through atmospheric turbulence, and if the light intensity is expressed as I, the logarithmic light intensity fluctuation variance received in an aperture with diameter D at the propagation distance L is
Wherein k is the number of light waves and k=2pi/λ; k is the space wave number; gamma=z/L is the propagation factor of the spherical wave;the spatial spectral density, which represents the refractive index fluctuations, can be expressed as
Wherein the method comprises the steps ofI.e. the structural constant of the refractive index of the atmosphere, f (Kl) 0 ) Is a factor describing the internal scale effect, f (Kl for uniform isotropic turbulence 0 ) =1; f (K) is an aperture filter function, and F (K) is the aperture of the circular ring with the ratio of inner diameter to outer diameter epsilon (epsilon=0 is the circular receiving aperture)
Usually by flicker indexRepresenting the intensity of the light intensity fluctuations,
wherein < is > represents a statistical average. It is known that under weak fluctuating conditions, the relationship between the flicker index and the logarithmic light intensity fluctuation variance is
If it is possible to measure within a certain receiving apertureKnowing the laser wavelength, path length, aperture parameters, the reverse can be used to calculate +.>To sum up, the principle formula can be deduced:
in practical application, the calculation is not directly utilizedBut rather uses a simpler scaling formula
The relative error of the two formulas is less than 6%.
b. Method of fluctuation of arrival angle
Atmospheric turbulence not only causes flickering of the laser light intensity, but also causes fluctuation of the angle of arrival of the light beam. Fluctuation of angle of arrival and structural constant of atmospheric refractive indexThe relation of (2) is:
wherein D is the aperture of the optical receiver and L is the transmission distance. Is the fluctuation variance of the arrival angle in azimuth direction, +.>Is the variance of the angle of arrival fluctuations in the pitch direction. From the measured angle of arrival fluctuation variance, the atmospheric refractive index structural constant can be calculated according to the above formula.
(3) Wind direction and speed measurement
The propeller type anemometer, three-blade anemometer, is one set of five-blade propeller type anemometer rotating around horizontal axis. The propeller is installed in front of a wind vane, so that its rotation plane always faces the wind direction, and its rotation speed is proportional to wind speed.
(4) Measurement of temperature, pressure and humidity
The temperature, pressure and humidity are measured by a temperature sensor, a pressure sensor and a humidity sensor respectively.
The device can accurately measure the atmospheric visibility and the turbulence intensity, and the design adopts a transmission type measurement method to synchronously acquire the atmospheric visibility and the atmospheric turbulence intensity. In addition, a temperature, pressure, humidity, wind speed and wind direction measuring system is added on the basis, so that a meteorological element comprehensive measuring system is formed. The method has important significance for atmospheric environment monitoring, air quality forecasting, radiation climate and environmental effect research.
Claims (9)
1. An atmospheric turbulence intensity and visibility measuring device, comprising an optical transmitting unit, an optical receiving unit, an instrument control and data receiving unit, wherein:
the optical emission unit comprises a semiconductor laser emitter, a chopper, a collimating lens group, a control power supply, a light source driving circuit and an automatic light power control circuit, wherein the control power supply, the light source driving circuit and the automatic light power control circuit are sequentially connected, laser from the semiconductor laser emitter emits laser beams through the light source driving circuit and the automatic light power control circuit, and the laser beams are subjected to light frequency modulation through the chopper and are used for measuring turbulence of turbulence in the atmosphere; the optical receiving unit comprises a short-focal-length laser receiving component, a camera system, a wind speed and direction measuring system, a temperature sensor, a pressure sensor, a humidity sensor and a temperature control module;
the instrument control and data receiving unit comprises a data preprocessing unit, an A/D conversion unit, an image acquisition unit, an image processing unit and a display unit which are sequentially connected, wherein a laser beam bundle processed by the optical transmitting unit is received by the camera system after passing through the short-focal-length laser receiving assembly, and is processed by the data preprocessing unit, the A/D conversion unit, the image acquisition unit and the image processing unit in sequence, and finally, the result is displayed on the display module;
the laser wavelength emitted by the semiconductor laser emitter is 600-900nm; the collimating lens group consists of a double-cemented collimating lens and a double-lens collimating lens, wherein the double-cemented collimating lens comprises two lenses cemented together, the thickness of the first lens is 12mm, the thickness of the second lens is 6mm, the divergence angle RMS of emergent light is 0.998 mu m, the double-lens collimating lens comprises two convex lenses with the thicknesses of 6.7mm and 13mm respectively, the divergence angle RMS of emergent light is 0.904 mu m, the distance between the lenses is 100-125 mm, the focal length of the transmission lens of the short focal length laser receiving component is 150-450mm, and the effective aperture D is 30-50mm;
the control power supply is respectively connected with the temperature sensor, the humidity sensor, the pressure sensor, the camera system and the wind power and wind direction measuring system.
2. The atmospheric turbulence intensity and visibility measuring device according to claim 1, wherein the laser power of the semiconductor laser transmitter is 15-45w, the bandwidth is 1-5nm, the semiconductor laser transmitter connects the laser and the chopper through the multimode optical fiber, and the optical fiber output numerical aperture is 0.18-0.23.
3. The atmospheric turbulence intensity and visibility measuring device of claim 1, wherein the dual glue collimating lens first block of lens material is H-QK3L and the second block of lens material is SF5.
4. The atmospheric turbulence intensity and visibility measuring device of claim 1, wherein both pieces of convex lens glass material of the dual lens collimating lens are BK7.
5. The atmospheric turbulence intensity and visibility measuring device of claim 1, wherein the short focal length laser receiving assembly is comprised of a transmissive lens and a CCD camera.
6. The atmospheric turbulence intensity and visibility measuring device of claim 1, wherein said camera system is a camera for taking 24h visibility conditions; the wind speed and direction measuring system is a three-blade wind speed and direction measuring instrument and is used for detecting real-time wind speed and wind direction; the temperature sensor, the pressure sensor and the humidity sensor are respectively used for detecting real-time atmospheric temperature, atmospheric pressure and atmospheric humidity.
7. The atmospheric turbulence intensity and visibility measurement device of claim 1, wherein the temperature control module is disposed inside the short focal length laser receiving assembly independent of the temperature sensor, the pressure sensor, and the humidity sensor for controlling the temperature of the short focal length laser receiving assembly.
8. The atmospheric turbulence intensity and visibility measuring device of claim 1, wherein a heat sink is provided outside of the semiconductor laser transmitter and short focal length laser receiving assembly.
9. The atmospheric turbulence intensity and visibility measuring device according to claim 1, wherein the outer sides of the optical transmitting unit, the optical receiving unit, the instrument control and the data receiving unit are respectively provided with a housing.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711318236.XA CN108227039B (en) | 2017-12-12 | 2017-12-12 | Atmospheric turbulence intensity and visibility measuring device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711318236.XA CN108227039B (en) | 2017-12-12 | 2017-12-12 | Atmospheric turbulence intensity and visibility measuring device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN108227039A CN108227039A (en) | 2018-06-29 |
| CN108227039B true CN108227039B (en) | 2023-09-22 |
Family
ID=62649376
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201711318236.XA Active CN108227039B (en) | 2017-12-12 | 2017-12-12 | Atmospheric turbulence intensity and visibility measuring device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN108227039B (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109187357A (en) * | 2018-09-04 | 2019-01-11 | 南京大学 | A kind of atmospheric visibility and turbulent flow synchronized measurement system and measurement method |
| CN114880958B (en) * | 2022-07-12 | 2022-10-11 | 南京气象科技创新研究院 | Visibility forecasting method based on multi-meteorological-factor intelligent deep learning |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105928689A (en) * | 2016-06-24 | 2016-09-07 | 中国科学院云南天文台 | Laser far field divergence angle measurement method and device in satellite laser ranging |
| US20170168161A1 (en) * | 2013-10-08 | 2017-06-15 | Soreq Nuclear Reseaerch Center | Atmospheric turbulence data optical system |
| CN208092264U (en) * | 2017-12-12 | 2018-11-13 | 南京大学 | A kind of atmospheric turbulence intensity and visibility measurement device |
-
2017
- 2017-12-12 CN CN201711318236.XA patent/CN108227039B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20170168161A1 (en) * | 2013-10-08 | 2017-06-15 | Soreq Nuclear Reseaerch Center | Atmospheric turbulence data optical system |
| CN105928689A (en) * | 2016-06-24 | 2016-09-07 | 中国科学院云南天文台 | Laser far field divergence angle measurement method and device in satellite laser ranging |
| CN208092264U (en) * | 2017-12-12 | 2018-11-13 | 南京大学 | A kind of atmospheric turbulence intensity and visibility measurement device |
Also Published As
| Publication number | Publication date |
|---|---|
| CN108227039A (en) | 2018-06-29 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN105424631B (en) | A kind of hypersensitivity nitrogen oxides measuring system based on UV, visible light wave band absorption spectrum | |
| CN104880711B (en) | Single wavelength four Raman lidar detection system and detection method | |
| JP6134063B2 (en) | Multi-channel aerosol scattering absorption measuring instrument | |
| CN208092264U (en) | A kind of atmospheric turbulence intensity and visibility measurement device | |
| CN101814952B (en) | Method for testing lightwave transmission characteristics in atmospheric channel | |
| CN108594257B (en) | Speed measuring sensor based on Doppler effect and calibration method and measuring method thereof | |
| CN103472456A (en) | Active imaging system and method based on sparse aperture compressing calculation correlation | |
| CN104316443A (en) | PM2.5 concentration monitoring method based on CCD back scattering | |
| CN103630908A (en) | Laser frequency spectrum retrieval method and measurement calibration method for molecular scattering anemometry laser radar | |
| CN108227039B (en) | Atmospheric turbulence intensity and visibility measuring device | |
| CN102735633A (en) | Light path online calibration type cavity enhanced atmosphere trace gas detection system | |
| CN106442428B (en) | Optical fiber type measuring method for visibility based on multiple reflections | |
| CN106018346A (en) | Aerosol scattering phase function observing device and method | |
| CN104237162B (en) | The measurement system of a kind of air index imaginary part structural constant and measuring method | |
| CN109342758A (en) | Novel velocity sensor | |
| CN203376261U (en) | Real-time measurement device for off-axis atmosphere turbulence intensity profiles | |
| Han et al. | Ground-based synchronous optical instrument for measuring atmospheric visibility and turbulence intensity: Theories, design and experiments | |
| David et al. | Cross-sectional measuring of optical beam | |
| CN109283550B (en) | All-solid-state all-day water vapor scanning detection laser radar system and detection method | |
| CN103424380A (en) | Off-axis real-time measuring device and method for atmosphere turbulence intensity profile | |
| CN203376478U (en) | Apparatus of receiving laser beacon measurement atmosphere turbulence intensity profile | |
| CN205826867U (en) | A kind of device of air wind speed profile detection | |
| CN210954349U (en) | Miniaturized sha shi atmosphere laser radar system | |
| Yu et al. | Broadband continuous-wave differential absorption lidar for atmospheric remote sensing of water vapor | |
| EP3799620B1 (en) | System for the real-time high precision measurement of the atmospheric attenuation of electromagnetic radiation |
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 | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |