Influence of Signal to Noise Ratio on Atmospheric Coherence Length Measured by DIMM

Journal of Atmospheric and Environmental Optics ›› 2018, Vol. 13 ›› Issue (3): 178-184.

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Influence of Signal to Noise Ratio on Atmospheric Coherence Length Measured by DIMM

SHA Yang1,2, JING Xu1*, WU Yi1, HOU Zaihong1

(1 Key Laboratory of Atmospheric Optics, Anhui Institute of Optics and Fine Mechanics, Chinese Academy of Sciences, Hefei 230031, China;
2 University of Science and Technology of China, Hefei 230026, China)

Received:2017-01-05 Revised:2017-02-07 Online:2018-05-28 Published:2018-05-31
Supported by:
Supported by National Natural Science Foundation of China (国家自然科学基金,41405014)

Abstract

Abstract:

In the field measurement, different signal to noise ratios(SNR) have a great impact on the experimental results with the same instrument and data processing methods. By analyzing the noise model measured in the field, the same noise is added to the spot image simulated to change the SNR while the signal intensity is kept unchanged. When the SNR is less than 5, the relative deviation increased significantly. Then different methods are used to subtract the background noise under the same SNR, and it is found that the Gaussian noise has little effect on the centroid position after subtracting the average background value. The results show that the overall performance of the subtraction of 1 times average background and 0.6 times background fluctuation standard deviation is found to be the best.

Key words: atmospheric coherence length, signal to noise ratio, relative deviation; simulation, DIMM

CLC Number:

TP391.9

SHA Yang, JING Xu, WU Yi, HOU Zai-Hong. Influence of Signal to Noise Ratio on Atmospheric Coherence Length Measured by DIMM[J]. Journal of Atmospheric and Environmental Optics, 2018, 13(3): 178-184.

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Influence of Signal to Noise Ratio on Atmospheric Coherence Length Measured by DIMM

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