Abstract
Optical fibers can act as a sensor for strain or temperature through the properties, such as scattering. By applying ways to analyze distribution of the property along the fiber, “fiber optic nerve systems” are realized to sense damages induced in materials and structures, in which the fiber is embedded. Fiber Brillouin scattering has a frequency of about 11 GHz down-shifted from the input lightwave. The frequency shift is changed by longitudinal strain applied to the fiber [1]. Time domain techniques developed for distribution measurement, however, have a spatial resolution limit of about 1 meter [1]. The pulse-based systems also require several minutes of measurement time, because the scattered power by a single pulse is quite tiny.
© 2007 IEEE
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