| 摘要 |
<p>A system for discovering objects of different kinds, for finding victims of avalanches, ship wreckage etc., for warning of risky actions etc., consisting of a transmitter and a transponder. A signal emitted from the transmitter is reflected by the transponder in the form of an overtone of the emitted signal. The transponder, which can be double-sided with a reflector inbetween, consists of an antenna with one or several semiconductors, a reflector and an intervening dielectricum dimensioned to give the reflected output signal maximum strength. The dielectricum can be an integral part of an article of clothing or an object. It can also be arranged to be introduced between antenna and reflector at for example inflation of a life-jacket, whereby life-jackets not in use may be inactive and not interfer with the search for floating persons. In order to ease the handling the transmitter can also be divided up so that only a smaller part with the antennas has to be kept in the hand while batteries and the remaining construction for example can be carried on the back. The weight of the movable part thus can be brought down to a fifth of the total weight (about 1 kg), which is a substantial relief during hours of searching.</p> |
