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Proceedings Paper

Experimental evaluation of spot dancing of laser beam in atmospheric propagation using high-speed camera
Author(s): Moriya Nakamura; Makoto Akiba; Toshiaki Kuri; Naoki Ohtani
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Paper Abstract

We investigated the frequency spectra and two-dimensional (2-D) distributions of the beam-centroid fluctuation created by spot dancing, which are needed to optimize the design of the tracking system, by using a novel spot-dancing measurement method to suppress the effect of building and/or transmitter vibration. In this method, two laser beams are propagated apart from each other and observed simultaneously using high-speed cameras. The position of each beam centroid is obtained using an image processing system. The effect of transmitter vibration is suppressed by taking the difference between the 2-D coordinate data of the beam-centroid positions. The frequency spectra are calculated using the fast Fourier transform. The beam spots of two HeNe lasers propagated 100 m (indoor) and 750 m (open-air) were observed using a high-speed camera of 10,000 frame/sec. Frequency spectra of the beam-centroid variance of up to 5 kHz could be observed. We also measured the variations of spot dancing in two days when the rates of sunshine were 100% and 0%.

Paper Details

Date Published: 30 April 2003
PDF: 10 pages
Proc. SPIE 4976, Atmospheric Propagation, (30 April 2003); doi: 10.1117/12.473177
Show Author Affiliations
Moriya Nakamura, Communications Research Lab. (Japan)
Makoto Akiba, Communications Research Lab. (Japan)
Toshiaki Kuri, Communications Research Lab. (Japan)
Naoki Ohtani, Communications Research Lab. (Japan)

Published in SPIE Proceedings Vol. 4976:
Atmospheric Propagation
Cynthia Y. Young; John S. Stryjewski, Editor(s)

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