| 摘要 |
The portal has two cross pieces one of which has a vertical bar for sets of light sources (40.1-40.n) distributed along the height of the portal, where sources emit optical radiation of wavelength according to a nature of a signal that is detected on receiving coils (22) by a supplying and processing module (30). Each set of light sources is formed of a single source. The module analyses the signal on the coils for detecting the presence of metals influencing magnetic and/or electric field and coupling between emitting coils (20) and the receiving coils. |
