Ground-based synchronous optical instrument for measuring atmospheric visibility and turbulence intensity: theories, design and experiments

Han, Yong; Gao, Peng; Huang, Jiaolong; Tongxiao, Zhang; Zhuang, Jianjun; Hu, Mengjun; Wu, Yonghua

doi:10.1364/oe.26.006833

Cited by 12 publications

(4 citation statements)

References 25 publications

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“…In the near-surface, researchers mostly use the relationship between C 2 n and the temperature structure constant C 2 T [23][24][25]. A large aperture scintillometer (LAS) can measure the path-averaged C 2 n within a certain distance in high time resolution, which is also a common instrument using the intensity scintillation principle [26][27][28].…”

Section: Introductionmentioning

confidence: 99%

Turbulence Detection in the Atmospheric Boundary Layer Using Coherent Doppler Wind Lidar and Microwave Radiometer

Jiang

Yuan

et al. 2022

Remote Sensing

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The refractive index structure constant (Cn2) is a key parameter used in describing the influence of turbulence on laser transmissions in the atmosphere. Three different methods for estimating Cn2 were analyzed in detail. A new method that uses a combination of these methods for continuous Cn2 profiling with both high temporal and spatial resolution is proposed and demonstrated. Under the assumption of the Kolmogorov “2/3 law”, the Cn2 profile can be calculated by using the wind field and turbulent kinetic energy dissipation rate (TKEDR) measured by coherent Doppler wind lidar (CDWL) and other meteorological parameters derived from a microwave radiometer (MWR). In a horizontal experiment, a comparison between the results from our new method and measurements made by a large aperture scintillometer (LAS) is conducted. The correlation coefficient, mean error, and standard deviation between them in a six-day observation are 0.8073, 8.18 × 10−16 m−2/3, and 1.27 × 10−15 m−2/3, respectively. In the vertical direction, the continuous profiling results of Cn2 and other turbulence parameters with high resolution in the atmospheric boundary layer (ABL) are retrieved. In addition, the limitation and uncertainty of this method under different circumstances were analyzed, which shows that the relative error of Cn2 estimation normally does not exceed 30% under the convective boundary layer (CBL).

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Section: Introductionmentioning

confidence: 99%

Turbulence Detection in the Atmospheric Boundary Layer Using Coherent Doppler Wind Lidar and Microwave Radiometer

Jiang

Yuan

et al. 2022

Remote Sensing

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“…The decline in atmospheric visibility caused by increased aerosol emissions has become an important environmental issue in China. [1] Low visibility is a dominant problem in areas close to airports, which affects aviation safety during take-off and landing. Low-visibility weather conditions also limit road traffic and lead to navigational accidents, especially in the narrow areas of straits or rivers.…”

Section: Introductionmentioning

confidence: 99%

Feasibility analysis for acquiring visibility based on lidar signal using genetic algorithm-optimized back propagation algorithm

et al. 2019

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Visibility is an important atmospheric parameter that is gaining increasing global attention. This study introduces a back-propagation neural network method based on genetic algorithm optimization to obtain visibility directly using light detection and ranging (lidar) signals instead of acquiring extinction coefficient. We have validated the performance of the novel method by comparing it with the traditional inversion method, the back-propagation (BP) neural network method, and the Belfort, which is used as a standard value. The mean square error (MSE) and mean absolute percentage error (MAPE) values of the genetic algorithm-optimized back propagation (GABP) method are located in the range of 0.002 km 2 -0.005 km 2 and 1%-3%, respectively. However, the MSE and MAPE values of the traditional inversion method and the BP method are significantly higher than those of the GABP method. Our results indicate that the proposed algorithm achieves better performance and can be used as a valuable new approach for visibility estimation.

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“…12, No. 3, September 2023: 285-292 286 Atmospheric visibility descent is essential environmental trouble in China because of the massive extent of aerosol emissions [31]- [36].…”

mentioning

confidence: 99%

A new transmissometer method that measures runway visibility across a short distance

Abud

2023

IJAAS

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<p><span lang="EN-US">The present technique developed a transmissometer idea for intensity measurements in the ecosystem across an 80 cm distance. The method relies on the transmission of an optical or infrared (diode laser 785 nm) signal obtained on spectrum analyses (ocean optics HG4000) received signal from the laser under unique conditions (light dust, heavy dust, and waterdrops) at a short distance. Thus, this approach is useful to measure the intensities of the laser beam and locate the visibility measurements of laser transmissometers in the rain and special care to the dust. The results showed that heavy dust enhanced the visibility measurements for distinct intensity distributions between showers and dust. Since light and heavy dust within a single transmittance can easily cover the entire runway visual range (RVR) range for a brief period, visibility measurements were crucial. The full-scale value corresponds to infinite visibility for heavy dust (0.8611) and minimum visibility for drop rain conditions (0.01073).</span></p>

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Ground-based synchronous optical instrument for measuring atmospheric visibility and turbulence intensity: theories, design and experiments

Cited by 12 publications

References 25 publications

Turbulence Detection in the Atmospheric Boundary Layer Using Coherent Doppler Wind Lidar and Microwave Radiometer

Turbulence Detection in the Atmospheric Boundary Layer Using Coherent Doppler Wind Lidar and Microwave Radiometer

Feasibility analysis for acquiring visibility based on lidar signal using genetic algorithm-optimized back propagation algorithm

A new transmissometer method that measures runway visibility across a short distance

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