Abstract
AbstractMany optical fiber sensor systems in outdoor applications are in operation and reliability aspects are a major concern. We installed multiplexed fiber optical Bragg grating sensor systems in a stay cable bridge and in a power dam both operational for about two years now. We report on design aspects of such systems which have several constraints: First, the sensing parts of a single multiplexed fiber had to be located at certain positions and in a specific orientation. Further, the sensors must be compensated for environmental influence, the fibers were not allowed to be bent too tightly, and the fibers had to be embedded and protected in a sensor body in a way to survive its installation in the monitored structure. Finally the sensor must be reliable to be a useful measurement device.We present long term monitoring data and test results concerning the reliability of our systems and discuss benefits and disadvantages of the various applied sensor designs.
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