FIBER-OPTIC STRAIN SENSOR Russian patent published in 2022 - IPC G01L1/25 G01B11/16 

FIELD: measurement, control and diagnostics.

SUBSTANCE: fiber-optic strain sensor includes incoming and outgoing optical fibers, between which a shutter with a hole is placed, two cylindrical rods, coaxially arranged in a tight fit in a cylindrical housing, the shutter is made in a protrusion in the central part of the first rod, the second rod contains a protrusion in which a second through hole is made perpendicular to the longitudinal axis, and a slot along the axis, on both sides of which, in the projection, the third upper and fourth lower holes are made through each other and coaxially to the first hole in the curtain, and the radiating end of the incoming optical fiber is stretched through the second hole and fixed with the first sleeve in the third upper hole, and the receiving ends of the outgoing optical fibers are fixed with the second sleeve in the lower fourth outside the measurement area, all optical fibers are combined into a fiber-optic cable, hermetically fixed in the housing using a third sleeve, which is fixed by welding in the fifth through hole of the housing.

EFFECT: present invention enables to measure deformation of large-sized structures, improvement of metrological and operational characteristics, increase of tightness and reliability, absolute spark-explosion and fire safety.

6 cl, 4 dwg