| 摘要 |
PROBLEM TO BE SOLVED: To make measurable the snow depth in a state almost the same as measuring the surface of snow and enhance the measurement accuracy for snow depth in the measurement where the zero point of snow depth is defined when no snow is on the ground. SOLUTION: The apparatus for automatically measuring a snow depth includes a light-sending means 1 for projecting a distance measuring light L to a snow face, a light-detecting means 7 for receiving part of an irregularly reflected light from the snow face as a reflecting light R, a phase difference- measuring means 12 for measuring a light wave phase difference between the length measurement light and the reflecting light, a measuring means 14 for operating and evaluating a snow depth to a ground surface from a phase difference measurement signal outputted from the phase difference-measuring means, and a reference member Q arranged on the ground surface at a position where the length measurement light is projected and having a composition structure approximate to a snowfall. |
