An accurate measurement of densities of snowflakes using 3-D microphotographs
An accurate measurement of densities of snowflakes using 3-D microphotographs
复制标题
使用 3D 显微照片精确测量雪花密度
DOI：
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发表时间：
1993
影响因子：
2.9
通讯作者：
Masaaki Ishizaka
中科院分区：
文献类型：
--
作者：
Masaaki Ishizaka
开发了一种 3D 显微照相方法来准确测量雪花的密度。显微镜观察和照片是在现场拍摄的。雪花是雪晶体的集合体，其体积是通过多面体近似从 3D 照片中估算出来的。用电子天平测量雪花的重量。将获得的密度值与起泡程度和每个雪花的大小进行比较。结果清楚地表明，雾化是增加雪花密度的主要因素。雪花的密度对雪花本身尺寸的变化并不敏感，但稍微取决于其组成雪晶的尺寸。这里开发的技术将来将应用于研究飘落的雪花的密度。
A 3-D microphotographic method was developed to measure densities of snowflakes accurately. Microscopic observations and photographs were taken in the field. The volume of a snowflake which is an aggregate of snow crystals was estimated from the 3-D photo by polyhedron approximation. The weight of the snowflake was measured with an electro-balance. The density values obtained were compared with the degree of riming and the size of each snowflake. The results clearly show that riming is a prime factor in increasing the density of the snowflake. The density of a snowflake is not sensitive to the change of size of the flake itself, but depends slightly on the size of its constituent snow crystals. The technique developed here will be applied in the future to study of the density of falling snowflakes.