| 摘要 |
Parabolic mirror for electromagnetic waves is made of a first foil (3) of flexible inextensible material which has been preformed to a parabola and has its edges joined to a second foil (4) to form a fluid-tight internal space (I). An annular frame (10) holds the edge (6) of the first foil. Both foils are pref. made of PVC and have been welded together along the edge (6). When the interior (I) is inflated by a gas admitted through the connection (11), the foil (4) is stretched plane. ADVANTAGE - Mirror is easy to transport and to erect and is less costly than presently available parabolic mirrors. |
