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引言光学纤维温度传感器已是多年研究的课题。近来,研究的兴趣转向分布光纤传感器,它可以监视沿单一根光纤的许多独立位置上的温度,以确定热分布及热点位置。分布温度传感的最初实施有赖于液体芯光纤的光时域反射仪(OTDR)。在这种光纤中,局部的温度上升,导致了增大的散射信号,而它又可被OTDR所检测和定位。虽然这种器件曾被满意地演示,但是液体充填光纤的耐久性是未知的,而全固
Introduction Optical fiber temperature sensors have been the subject of many years of research. Recently, the interest of the research turned to distributed fiber optic sensors that can monitor the temperature at many independent locations along a single fiber to determine the heat distribution and hot spot location. The initial implementation of distributed temperature sensing relied on the optical time domain reflectometer (OTDR) of a liquid core fiber. In this fiber, the local temperature rise leads to an increased scattering signal, which in turn can be detected and positioned by the OTDR. Although such devices have been satisfactorily demonstrated, the durability of liquid filled optical fibers is unknown and the solid