Atmospheric visibility sensor based on backscattering using correlation coding method

Accurate measurements of visibility are of great importance in many fields. This paper reports a multipoint visibility measurement (MVM) method to measure and calculate the atmospheric transmittance, extinction coefficient, and meteorological optical range (MOR). The relative errors of atmospheric transmittance and MOR measured by the MVM method and traditional transmissometer method are analyzed and compared. Experiments were conducted indoors, and the data were simultaneously processed. The results revealed that the MVM can effectively improve the accuracy under different visibility conditions. The greatest improvement of accuracy was 27%. The MVM can be used to calibrate and evaluate visibility meters.

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Development and accuracy of a multipoint method for measuring visibility

Tai

Zhuang

Sun

2017

Appl. Opt.

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Comparative Analysis of Instrumental and Manual Visibility Observations at Xiamen Airport and the Influence of Relative Humidity

Jiang,

Li,

Ren

et al. 2023

Applied Sciences

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Visibility is a major factor affecting the safety and efficiency of aviation operations. As instrumental visibility measurements are the basis for calculating runway visual range, measurement accuracy is crucial. In this study, we collected instrumental visibility data (VI) from two sets of Vaisala transmissometers (referred to as LT05 and LT23) and one set of forward-scatter meters (referred to as FD) installed at Xiamen Airport. We also considered manually observed visibility (VM) and relative humidity (RH) records of automatic weather stations for 2015 to 2020. Taking the VM data as the benchmark, we comprehensively evaluated the difference between the VI of each instrument and VM as well as the influence of RH on such deviations based on the deviation (ΔV), relative deviation (ΔVMdi), root mean square error (RMSE), relative-RMSE, mean value, and correlation analysis method. Our results showed that: (1) among the three sets of visibility meters, the VI values of LT05 were the closest to the VM values under different VM levels and at high RH. Deviations in the FD measurements were greater than those of the two LT sets under low-visibility conditions that significantly affect aviation operations (VM < 800 m). (2) In general, the VI values were lower than the VM values, and the larger the VM value, the greater the deviation. (3) Extremely large ΔV and ΔVMdi values appeared in spring when the visibility level was rapidly increasing or decreasing. (4) The FD results were greatly affected by RH, with higher proportions of large ΔV and large ΔVMdi data than the two LT sets under high-humidity conditions. Therefore, the Vaisala transmissometers outperformed the forward-scatter meter at the airports along the southeastern coast of China and those in high-humidity environments.

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Atmospheric visibility sensor based on backscattering using correlation coding method

Cited by 2 publications

References 7 publications

Development and accuracy of a multipoint method for measuring visibility

Development and accuracy of a multipoint method for measuring visibility

Comparative Analysis of Instrumental and Manual Visibility Observations at Xiamen Airport and the Influence of Relative Humidity

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