アイスファブリック自動解析装置の開発　　第１報　画像解析による一軸性結晶主軸方位測定法

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  • Development of an automatic ice fabric analyzer. Part 1. Determination of c-axis orientation by a new image analysis.
  • アイスファブリック ジドウ カイセキ ソウチ ノ カイハツ ダイ1ポウ ガゾウ カイセキ ニ ヨル 1ジクセイ ケッショウ シュジク ホウイ ソクテイホウ
  • Part 1: Determination of c-axis orientation by a new image analysis
  • 第1報 画像解析による一軸性結晶主軸方位測定法

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In order to determine c-axis orientations of individual grains in a thin section of polycrystalline ice, a new method by image analysis technique has been developed. Images of ice thin section placed between rotating crossed polaroids are recorded with three CCD (Charge Coupled Device) cameras. One camera is set in a vertical position and the others are inclined 20 degrees with respect to the vertical axis. From the image intensity (gray value) data of each crystal in the thin section, the extinction angles of individual crystals can be determined. The c-axis orientation of an ice crystal can be calculated with the geometrical relation of the extinction angles with respect to three cameras. In order to verify this method, experiments using quartz specimens with different tilt angles of c-axes were carried out. A quadrant judgment method was developed to reduce miscalculation of c-axis orientations. By the combination of four sets of extinction angles with respect to four inclined CCD camera positions, the c-axis azimuth and tilt angle can be determined accurately.

収録刊行物

  • 雪氷

    雪氷 61 (2), 115-126, 1999

    公益社団法人 日本雪氷学会

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