Temperature measurement by means of fiber specklegram sensors (FSS)

摘要

In this work, a technique for temperature measurement using non-holographic fiber optic specklegrams is demonstrated experimentally. In the experimental scheme, a 632 nm laser source is coupled to a mono-multi-mono mode fiber arrangement, which produces a filtering effect that is used as an optical transduction mechanism. Thermal perturbations between 250C and 600C were applied to the fiber array, finding a linear response of the system and a sensitivity superior to the previously reported for studies in similar systems. Due to the low cost and simplicity of the technique, these results are of great interest for the implementation of this type of optical fiber sensors in a large number of engineering applications.