DEVELOPMENT OF AUTOMATIC ICE FABRIC ANALYZER (II)
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概要
- 論文の詳細を見る
An automatic ice fabric analyzer using an image processing method has been developed which determines the c-axis orientations of individual grains in a thin polycrystalline ice section. The computer-controlled device makes it possible to label each crystal and determine its c-axis orientation quickly without any manual operation. In our earlier studies, it was found that this method often gives a miscalculated c-axis orientation whose azimuth angle differs 90 degrees from the true one and also gives no solution in some cases. In order to improve the analysis accuracy, the method based on Light Analysis with Inclined CCD-cameras (LAIC) is improved and an automated analysis instrument has been developed. According to LAIC, while the crossed polarioids are being rotated, an ice thin section placed between crossed polarioids is photographed with three cameras, of which one is set in a vertical position, the other two are inclined 15 degree with respect to the vertical axis, The orientations of the optic axes of every individual ice crystal are calculated on a personal computer with the relation of the extinction position angles about three cameras which are calculated from the shift of the image's gray tone. A new method of Lightness Analysis has been attempted to improve the analysis accuracy. Two similar procedures are involved; however, between the two procedures, the thin sections need to be rotated 90 degree around a vertical axis, to obtain three extinction position angles. By comparing values of the two extinction position angles about the inclined cameras in both procedures, the azimuth angle can be determined accurately. It was shown that the orienting results of quartz and ice thin sections with the new method are in comparative agreement with those obtained by using a Rigsby stage, and the reproducibility of the new method is better. Over 80 percent of orienting results of thin ice sections show that the variation between the automated analysis result and that obtained by using a Rigsby stage is not over ±10 degree.
- 国立極地研究所の論文
著者
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WANG Yun
Department of Medicine and Science in Sports and Exercise, Tohoku University Graduate School of Medi
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AZUMA Nobuhiko
Department of Mechanical Engineering, Nagaoka University of Technology
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Azuma Nobuhiko
Department Of Mechanical Engineering Nagaoka University Of Technology
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Azuma Nobuhiko
Department Of Applied Physics Faculty Of Engineering Hokkaido University
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Wang Yun
Department Of Chemistry Northwest Normal University
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KAMIMURA Seiji
Department of Mechanical Engineering, Nagaoka University of Technology
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UMEMURA Teruyoshi
Department of Mechanical Engineering, Nagaoka University of Technology
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Kamimura Seiji
Department Of Mechanical Engineering Nagaoka University Of Technology
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Wang Yun
Department Of Mechanical Engineering Nagaoka University Of Technology
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Umemura Teruyoshi
Department Of Mechanical Engineering Nagaoka University Of Technology
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Wang Yun
Department Of Anesthesiology Huashan Hospital Fudan University
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