Fold-Path Atmospheric Coherence Length Measurement by Laser-Active Illumination Imaging

Junxin Zhang; Haiping Mei; Yichong Ren; Ruizhong Rao

doi:10.3788/AOS221854

Acta Optica Sinica, Volume. 43, Issue 12, 1201003(2023)

Fold-Path Atmospheric Coherence Length Measurement by Laser-Active Illumination Imaging

Junxin Zhang^1,2,3, Haiping Mei^1,3、*, Yichong Ren^1,3, and Ruizhong Rao^1,3

¹Key Laboratory of Atmospheric Optics, Chinese Academy of Sciences, Anhui Institute of Optics and Fine Mechanics, Hefei Institutes of Physical Science, Chinese Academy of Sciences, Hefei 230031, Anhui, China

²Science Island Branch of Graduate School, University of Science and Technology of China, Hefei 230026, Anhui, China

³Advanced Laser Technology Laboratory of Anhui Province, Hefei 230037, Anhui, China

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Figures & Tables(8)

Fig. 1. Schematic of the $r_{0}$ measurement comparison experiment

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Fig. 2. Schematic of the active illumination laser beam imaging experiment

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Fig. 3. $r_{0}$ measurement results of fold-path DIMM and traditional DIMM on October 27, 2021

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Fig. 4. Ratio of fold-path DIMM and traditional DIMM measurement results on October 27, 2021

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Fig. 5. Comparison of C $_{n}^{2}$ inversion by centroid drift and DIMM under the circumstances of unfocused beam. (a) Distribution of measurement results; (b) correlation analysis between two measurements

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Fig. 6. Comparison of C $_{n}^{2}$ inversion by centroid drift and DIMM under the circumstances of focused beam. (a) Distribution of measurement results; (b) correlation analysis between two measurements

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Table 1. Parameters of fold-path DIMM experiment

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Table 1. Parameters of fold-path DIMM experiment

Instrument

Parameter

DIMM

Focal length：2.845 m

Subaperture diameter：0.12 m

Subaperture separation：0.24 m

Pixel size：4.54 µm

Digit：14 bit

Exposure time：200 µs

Meade

Model：ACF14F8

Aperture：355 mm

Focal length：2.845 m

Allied Vison GT 1920 CCD

Exposure range：10 µs-26.8 s

Pixel size：4.54 µm

Sample frequency up to 40.7 frame/s

Resolution：1936 pixel×1456 pixel

Table 2. Parameters of the active illumination laser beam imaging experiment

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Table 2. Parameters of the active illumination laser beam imaging experiment

Instrument

Parameter

DIMM

Focal length：3.55 m

Subaperture diameter：0.12 m

Subaperture separation：0.24 m

Pixel size：3.75 µm

Digit：14 bit

Exposure time：200 µs

BOSMA

Model：MK24020

Aperture：200 mm

Focal length：1200 mm

ASI 290MM CCD

Exposure range：32 µs-2000 s

Pixel size：2.9 µm

Sample frequency：330 Hz/560 Hz

Resolution：1936 pixel×1096 pixel

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Junxin Zhang, Haiping Mei, Yichong Ren, Ruizhong Rao. Fold-Path Atmospheric Coherence Length Measurement by Laser-Active Illumination Imaging[J]. Acta Optica Sinica, 2023, 43(12): 1201003

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Paper Information

Category: Atmospheric Optics and Oceanic Optics

Received: Oct. 20, 2022

Accepted: Nov. 30, 2022

Published Online: Jun. 20, 2023

The Author Email: Mei Haiping (hpmei@aiofm.ac.cn)

DOI:10.3788/AOS221854

Topics

laser devices and laser physics

Lasers and Laser Optics

Laser physics

laser manufacturing

Instrumentation, Measurement and Metrology