Optical Fiber-Based Sensing of Strain and Temperature at High Temperature

摘要

In-line intensity-based and Fabry-Perot silica optical fiber sensors have been developed to measure strain and temperature at temperatures up to 1500°F. The intensity-based sensor is an air gap splice in which the gap spacing changes as the length of the sensor housing changes. Two silica multimode optical fibers are placed in a hollow silica tube so their ends are separated by an initial gap spacing. As the sensor is strained, the gap spacing varies, resulting in a predictable change in output intensity. The Fabry-Perot sensor uses both single-mode and multimode fibers which are axially aligned inside a similar hollow core fiber. The four percent reflections which occur at both the glass-air interface at the end of the input singlemode fiber and at the air-glass interface at the surface of the multimode fiber differ in phase by an amount proportional to the separation between the two fiber ends. As the sensor is strained, the separation distance between these fiber ends changes, and the output signal intensity varies due to the interference between the reflected signals.