光ファイバを用いたセンシング技術

概要

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Transmitted light through optical fibers is sensitive to the state of fibers. The velocity of light, the loss, and the polarization depend on the physical conditions of the fiber. It can be used to measure temperature, pressure, strain, and other physical parameters. Optical fiber sensors have a high potential as a monitor of environment and the weather because of distribution sensing and robustness. An anemometer using optical fibers is proposed and demonstrated. A Mach-Zehnder interferometer with polarization-maintained fibers is used for the sensor. Wind velocity is estimated from the theory based on the vibration of the Karman vortex. The measured spectrum shows the beat signals due to the vibration.
2011-01-31