FIELD: measuring equipment.
SUBSTANCE: invention relates to measuring equipment using optical fiber and concerns a fencing with a means for the detection of a tunnel with a linear part of a fiber-optic security detector. The fencing is a fencing formed by an obstacle extended between pillars installed on foundations, between which, in the soil or on a mesh extended in the soil, a sensitive element of the linear part of the detector, which uses interferometers, is located.
EFFECT: increase in the sensitivity and operational reliability of a detector.
5 cl, 12 dwg
