| 摘要 |
<p>PURPOSE:To make it unnecessary to bring down a battery for charging and to enable execution of long-time and continuous observation by disposing a solar battery at the top of a pylon so that it is used as a power source. CONSTITUTION:Receiving the sunlight, a solar battery 12 generates electricity and charges a battery 4 therewith. In the night and in cloudy weather, an electro-optical converter 3 is made to operate by a discharge of the battery charged during an interval of clear weather in the daytime. When a light projector 14 is disposed on the ground 6, moreover, the solar battery 12 receives a light 14S emitted by the projector and generates electricity. By making the projector 14 operate constantly, the solar battery 12 can be made to generate electricity continuously irrespective of day and night and a change in the weather and the capacity of the battery 4 does not need to be large. By interposing an optical fiber cable 15, moreover, the light 14S is transmitted thereby to the solar battery 12 and an optical path can be ensured even when snowfall continues in an area of heavy snowfall.</p> |
