| 摘要 |
<p>A device to detect the presence of a target material (11) comprising a source module (12) and detector module (14). The source module (12) includes a generator to producing a source signal corresponding to a characteristic frequency of the target material (11). The detection module (14) detects a location of the target material (11) wherein the detection module (14) detects an interference signal generated between the source signal and a signal generated by target material (11) caused by exposure to the source signal. The device uses frequencies between 100 MHz and 1.5 GHz. <IMAGE></p> |
