METHOD OF MEASURING DISTRIBUTION OF MECHANICAL DEFORMATIONS BY LENGTH OF OPTICAL FIBER Russian patent published in 2017 - IPC G01K11/32 

FIELD: measuring equipment.

SUBSTANCE: method includes the organization of a reflectometric optical scheme. A sequence of radiation pulses or frequency-modulated optical radiation is generated. This radiation by means of a reflectometric optical scheme into an optical fiber is entered. Before the photoreceiver of the radiation scattered in the backward direction, spectral filtration of the radiation scattered in the backward direction is performed with the emission of Raman radiation. The reflectogram is constructed. The magnitude of the mechanical deformation of the sections of the optical fiber is judged by the Raman radiation scattered backwards by these sections. An optical fiber having local sections certainly not experiencing longitudinal mechanical deformations with known coordinates along the length of mentioned optical fiber as reference frames is used. A reference channel is organized, which is used as a reflectogram constructed on the basis of additional recording of the radiation Rayleigh scattering intensity. In addition to the distribution of mechanical deformations along the length of the optical fiber, the temperature distribution is also measured in relation to the intensities of the antistokes and stokes components of Raman scattering radiation.

EFFECT: simplifying the technology of measuring the distribution of mechanical deformations along the length of an optical fiber.

5 cl, 2 dwg