SENSING ELEMENT OF A FIBER-OPTIC STRAIN GAUGE FOR MEASURING LONGITUDINAL MECHANICAL TENSION AND A METHOD FOR MEASURING THE LONGITUDINAL MECHANICAL TENSION OF AN OBJECT WITH A FIBER-OPTIC STRAIN GAUGE Russian patent published in 2022 - IPC G01B11/16 

FIELD: measuring technology.

SUBSTANCE: group of inventions relates to the field of fiber-optic measuring devices. The fiber-optic sensing element of longitudinal mechanical tension includes an optical fiber with n-pairs of chirped fiber Bragg gratings (CFBG) induced in it, fixed to the equipment. The area of the optical fiber sensitive to longitudinal mechanical tension, containing the first of the pairs of CFBG, is fixed in the equipment area, to which the longitudinal mechanical tension of the object under study is transmitted. The second of the CFBG pairs is in the equipment area, which does not experience the longitudinal mechanical tension transmitted by the object under study. Further, there is a general broadening of the reflection spectrum of the sensing element, which, when the sensing element is irradiated with broadband radiation, leads to an increase in the reflected optical power recorded by the optical power meter, expressing the degree of applied mechanical tension.

EFFECT: increase in the accuracy of measuring the longitudinal mechanical tension, an improvement in the signal–to-noise ratio, a simplification of the survey scheme.

2 cl, 5 dwg