レーザー・ビームによる雪面検出

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Snow surface detection has been achieved by a new detector that consists of a light beam of He·Ne gas laser and a small-size sillicon photocell. In the detector, the He·Ne gas laser beam projected horizontally is detected by the sillicon photocell that is attached with a small-bore hood to reduce sunlight, and the ascending snow surface is detected by the interception of the laser beam by the snow surface. Using the detector, a measuring apparatus for repeated measurements at every 2-cm snow depth was constructed, and the reliability test of this apparatus has been carried out at Yukomabetsu, Hokkaido from 26 March to 2 April 1971. On the other hand, a relation between the snow depth change and the snow fall intensity has been investigated by the use of observed data. In the present paper, four experimental results are given as follows : (1) The snow surface detector by laser beam is not affected by most of weather conditions or by sunlight changes. (2) During snowfall, a relative decrease of snow cover thickness near the snow surface has been noticed. This phenomenon is due to an increase in the weight of successively falling snowflakes. (3) Four observational results of the relation between the snow depth change and the snow tall intensity at Yukomabetsu agree with the result of similar observation at Nagaoka (Kimura, 1971). (4) The apparatus for repeated measurements has a function of a snowfall intensity meter. With this special merit, the apparatus can be used as a detector in automatic snow melting operation system such as water sprinkling, but some counterplans against freezing of the wet snow settling on the apparatus are necessary.
社団法人日本雪氷学会の論文

レーザー・ビームによる雪面検出

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