Fiber optic interferometric method for investigation of deformations of building structure

Abstract

It is shown, that the singlefiber doublemode interferometer implanted into structure of a tested concrete unit allows to measure the unit structural deflection, absolute elongation and residual deformations in real time with accuracy not worse, than 0,05 im . It is also shown, that the developed interferometric method allows to indicate a point of time of unit's crack initiation and to estimate the crack opening displacement.

Optical transmission modulation by fiber guide bending

“…At present, numerous different types of fiber optic sensors have been developed. For example, the authors [2] suggested the design of a single fiber double mode interferometer to control deformation of concrete constructions, in particular buildings. In the study [3], the possibility of registration and spatial reconstruction of acoustic field created in a solid plate by an adaptive 32-channel hologram interferometer was examined.…”