Item: Nmr imaging of snow
Title: Nmr imaging of snow
Proceedings: Proceedings of the 2000 International Snow Science Workshop, October 1-6, Big Sky, Montana
Authors: Toshihiro Ozeki, Ship Research Institute, Mitaka, Japan Akihiro Hachikubo Kitami Institute of Technology, Kitami, Japan Katsumi Kose Institute of Applied Physics, University of Tsukuba, Tsukuba, Japan Kouichi Nishimura Institute of Low Temperature Sc
Abstract: NMR imaging was introduced to visualize and analyze the three-dimensional structure of snowpack. We used three types of snow; ice spheres, coarsened snow grains and depth-hoar crystals/ In particular, because ice spheres had a uniform particle size and large enough, they was suitable material for the test imaging. Because the NMR signal from the ice was very weak, the air space of snow was filled with iron-acetylaetonate doped dodecane C12H26, which had a good infiltration property and a low freezing point (about -12°C), and we looked at the space occupied with dodecane instead The result of test imaging of Dodecane showed 0.5 to 2 hours were needed to obtain the one 3D image, and hence we developed a specimen-cooling system using nested pipes. Cold air was sent between the pipes to keep the temperature below O°C. Experiments using the above snow and the system were carried out and we succeeded to obtain 3D microscopic images; the image matrix was 1283 and voxel size was 0.2 mm3.
Keywords: nmr, three-dimensional imaging, snow structure, ice sphere, dodecane
Digital Abstract Not Available