日本語フィールド
著者：Yuki Tashiro, Yuta Shimada, Kiyotaka Izumi, Takeshi Tsujimura, Koichi Yoshida題名：Optical axis identification technique for free space optics transmission発表情報：Int. J. of Advances in Telecommunications, Electrotechnics, Signals and Systems 巻: 6 号: 2 ページ: 89--96キーワード：Control of optical axis, Free space optics, Laser beam概要：This paper describes optical axis adjustment technique for an active free space optics transmission system. This system precisely controls the direction of a collimated thin laser beam using a motor driven laser emitting mechanism and positioning photodiodes. Before beginning laser beam feedback control, it is required to guide the laser beam within the range of the positioning photodiodes for initial laser beam alignment. This paper proposes an arrival position presumption method of laser beam traveling along the long distance from transmitter. A positioning sensor containing several photodiodes measures laser luminescence distribution, and analytically calculates the optical axis of laser beam according to the modified Gaussian beam optics based on four or five distributed local intensity of leaser luminescence. Experiments are conducted to evaluate the accuracy of the presumption, and results reveal that the method is effective in leading the laser beam onto a distant receiver.抄録：英語フィールド
Author：Yuki Tashiro, Yuta Shimada, Kiyotaka Izumi, Takeshi Tsujimura, Koichi YoshidaTitle：Optical axis identification technique for free space optics transmissionAnnouncement information:Int. J. of Advances in Telecommunications, Electrotechnics, Signals and Systems Vol: 6 Issue: 2 Page: 89--96Keyword：Control of optical axis, Free space optics, Laser beamAn abstract：This paper describes optical axis adjustment technique for an active free space optics transmission system. This system precisely controls the direction of a collimated thin laser beam using a motor driven laser emitting mechanism and positioning photodiodes. Before beginning laser beam feedback control, it is required to guide the laser beam within the range of the positioning photodiodes for initial laser beam alignment. This paper proposes an arrival position presumption method of laser beam traveling along the long distance from transmitter. A positioning sensor containing several photodiodes measures laser luminescence distribution, and analytically calculates the optical axis of laser beam according to the modified Gaussian beam optics based on four or five distributed local intensity of leaser luminescence. Experiments are conducted to evaluate the accuracy of the presumption, and results reveal that the method is effective in leading the laser beam onto a distant receiver.