The present sensor relates to distributed fibre optic sensors based on the phenomenon of Brillouin light scattering, which use an optical fibre as a sensing element, and can be used for measuring the distribution of mechanical stresses and/or temperature with a high degree of accuracy and a high spatial resolution. A distributed fibre optic sensor for measuring deformation and/or temperature using the phenomenon of Brillouin scattering contains two sources of optical radiation, a sensitive optical fibre, and an optical radiation detector, wherein a first end of the sensitive optical fibre is connected to the first source, and a second end is connected to the second source. The detector is connected to the first end of the sensitive optical fibre to register a signal. The second source is connected to the sensitive optical fibre by a line link of a fibre optic transmission line, the length of which is not less than half of the length of the sensitive optical fibre, wherein the line link is equipped with a device which prevents optical radiation from the sensitive optical fibre from entering the line link. The technical result is an increase in the distance to remote measuring regions, a reduction in measuring time, and an increase in signal-to-noise ratio.
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