| 摘要 |
The system contains a fiber optical transmission line (6), a first light source (10) for emitting a first light beam into a first end of the transmission line (6), and at least one first light sensitive element (46) for receivlng light from a second end of the transmission line (6). The first light beam contains coded information which is decoded by a decoder (72) connected to the first light sensitive element (46). The decoder (72) will issue a specific output signal when it is addressed. The system further contains a second light source (82) for emitting a second light beam into the second end of the transmission line (6). This source (82) is activated by the decoder (72) and is controlled in dependence upon information to be transmitted, preferably in dependence of a physical parameter (p1, p2, p3, p4). The system finally contains a second receiver element (90) for receiving light from the first end of the transmission line (6). This element generates an electric output signal which is in accordance with the transmitted information. The system preferably has a large number of transducer units (60) or measuring elements associated with various second ends of the transmission line (6) for transmitting information of various nature and/or from various locations. |
