Relationship between temporal and spatial reflectogram scales in fiber optical time domain reflectometry systems
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Correspondence between time instant of the reflectogram and position of the optical fiber sector at which the scattering occurred is analyzed for the longitudinally inhomogeneous optical fiber and the external perturbation of the general kind. Conditions on the rate of the refractive index and external perturbation dependence on the longitudinal coordinate are stated that imply explicit formulae for shifts of scattering segments of various position with respect to the external perturbation. The effects are numerically estimated in the cases of geometric elongation and heating of the fiber.
Keywordsoptical time domain reflectometry fiber optic sensors rayleigh scattering distributed sensors reflectogram scale
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