OPTICAL SENSING SYSTEM WITH REDUNDANT INPUT AND OUTPUT TREES

摘要

An optical sensing system, comprising a plurality of optical sensors (206... 209), first (203... 205) and second (215, 216) input trees, and first (210... 212) and second (219, 220) output trees. The first and second input trees are configured to direct respective optical signals from a first (202) and a second (214) input to each of the sensors, and the first and second output trees are configured to direct optical signals from each of the sensors (206... 209) to a first (213) and a second (221) optical output. The first and second input and/or output trees are configured to direct signals of particular wavelengths (A1 ... D-1, A2... D2) from particular sensors to the first and second input and/or output, respectively. A redundant connection system thus provided allows continued operation in the event of a fibre or cable break (300).