FIELD: physics, optics.
SUBSTANCE: invention relates to fibre optics, particularly to distributed fibre-optic sensors which measure parameters of an optical fibre under the effect of external physical fields. The disclosed methods for distributed measurement of birefringence in optical fibres with polarisation preservation, in addition to known methods which employ three signals, employ a fourth signal. Detection and statistical processing of recorded signals is performed using means of processing and storing signals with a zero mean. The fourth signal in the form of a linearly polarised signal can be fed into the optical fibre towards a probing signal and in the polarisation of the probing signal. In another version of the method, the fourth signal is mixed with a scattered signal during detection thereof.
EFFECT: improved spatial resolution, measurement accuracy and/or range (length) of the investigated section.
8 cl, 13 dwg
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