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29 June 1994 Scintillation measurement with 7 μm-band tunable laser in different seasons
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Results of the field measurement of scintillation for a 7 micrometers band semiconductor laser beam are described. To investigate the contribution of absorption, wavelength of the IR laser was tuned to a H2O absorption line center. The scintillation for a 0.67 micrometers visible laser was also monitored to compare with the IR's scintillation. This experiment was carried out in the daytime in the winter as well as in the summer of 1993. The power spectral density functions (PSDFs) were calculated from the experimental results of each season. In winter, the level of the PSDFs for the visible light was found about 10 times bigger than that for IR light. The PSDFs agreed with the theory reported by Filho. In summer, the PSDFs levels of the IR light, however, rise up to those of the visible one. The measured PSDFs for the TDL disagreed with the theoretical PSDFs. The scintillation for the IR lights is weaker than that for the visible lights in the theory only based on the temperature fluctuation. However, our experimental results show that the PSDFs for IR light is as strong as that for the visible lights in the condition of the high temperature and humidity.
© (1994) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Naoki Kagawa, Osami Wada, and Ryuji Koga "Scintillation measurement with 7 μm-band tunable laser in different seasons", Proc. SPIE 2222, Atmospheric Propagation and Remote Sensing III, (29 June 1994);

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