Measuring atmospheric turbulence strength based on differential imaging of light column

Huang, H. H.; Cui, Chaolong; Zhu, Wenyue; Hou, Zaihong; Yi, Wu; Rao, Ruizhong

doi:10.3788/col201311.120101

Cited by 4 publications

(3 citation statements)

References 7 publications

(11 reference statements)

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“…Compared to passive measurement methods, active measurement methods have unique advantages and are the focus of international scholarly research. Active measurement methods include differential imaging motion lidar, turbulent scintillation lidar, etc., which have low spatial resolution, Huang et al [5] proposed differential light column lidar in 2013 based on differential imaging motion lidar, which can measure turbulence profiles from 1 Km to 10 Km with higher spatial resolution. Huang et al verified the feasibility of their measurement method, but did not design a complete lidar system.…”

Section: Introductionmentioning

confidence: 99%

Design and control techniques of a differential light column lidar

li,

cui,

zhu

et al. 2024

Sixth Conference on Frontiers in Optical Imaging and Technology: Novel Detector Technologies

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Atmospheric coherence length represents the diffraction limit of light wave propagation through atmospheric turbulence, which characterises the integrated optical turbulence intensity in the atmospheric transmission path of light waves, and the measurement of atmospheric coherence length is of great significance. A light column turbulence lidar for atmospheric coherence length measurements has been developed based on differential image motion method and oblique range imaging for laser light column, which can obtain atmospheric coherence length profiles at a certain height in the vertical direction with a high spatial resolution, and can overcome the problem of non-active turbulence measurement devices that are not able to measure without suitable beacons or beacons that are occluded. The basic principle and system structure of differential light column lidar are introduced, and the whole lidar system can be divided into laser transmitting unit, signal receiving unit and control unit. The laser transmitter unit adjusts the direction of laser emission through the reflector, CCD camera, diaphragm and stepper motor. The signal receiving unit receives the beam backward scattering signals through the telescope and CCD camera to obtain the light column image, and adjusts the position of the CCD camera through the stepper motor to achieve focusing. The control unit receives and sends signals to control the operation of the entire system. A preliminary detection experiment was carried out with this lidar, and the height distribution profile of atmospheric coherence length was obtained. The variation trend of atmospheric coherence length with altitude is consistent with the theoretical trend, which verified the functionality of the lidar system.

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Section: Introductionmentioning

confidence: 99%

Design and control techniques of a differential light column lidar

li,

cui,

zhu

et al. 2024

Sixth Conference on Frontiers in Optical Imaging and Technology: Novel Detector Technologies

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show abstract

“…Compared with the mentioned methods, lidar allows higher spatial and temporal resolutions and can operate along arbitrary atmospheric paths 12 . Previous research took advantage of these features to extract turbulence information from light column images 13,14 . However, the inversion algorithm they used led to larger errors near the ground.…”

Section: Introductionmentioning

confidence: 99%

“…12 Previous research took advantage of these features to extract turbulence information from light column images. 13,14 However, the inversion algorithm they used led to larger errors near the ground. In this Letter, we report how the low-layer atmospheric refractive index structure parameter (C n 2 )…”

Section: Introductionmentioning

confidence: 99%

A vertical DIM lidar for refractive index structure parameter profiles estimation in low‐layer atmosphere

Qiu

Wang

Hou

et al. 2023

Micro & Optical Tech Letters

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This Letter presents an experimental demonstration of a vertical differential image motion (DIM) lidar for calculating the profiles of the low-layer atmospheric refractive index structure parameters. Utilizing the differences between weighting functions, we propose a convenient approach for the realtime estimation of low-layer C n 2 profiles from DIM lidar data. This approach only requires returned fluxes as input, yet it has the intrinsic ability to capture real-time turbulence profiles. Validations against the collected observational data have shown this approach to be computationally inexpensive. The longterm comparisons with micro-thermometers indicate that in such a way vertical DIM lidars can be used for providing not only a general assessment of turbulence effects along the measurement path but turbulence profiles.

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Science and technology of atmospheric effects on optical engineering: Progress in 3rd quinquennium of 21st century

Rao

2017

Sci. China Technol. Sci.

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Measuring atmospheric turbulence strength based on differential imaging of light column

Cited by 4 publications

References 7 publications

Design and control techniques of a differential light column lidar

Design and control techniques of a differential light column lidar

A vertical DIM lidar for refractive index structure parameter profiles estimation in low‐layer atmosphere

Science and technology of atmospheric effects on optical engineering: Progress in 3rd quinquennium of 21st century

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