STRAIN TRANSDUCER Russian patent published in 2015 - IPC G01B11/16 

FIELD: instrumentation.

SUBSTANCE: invention relates to inspection equipment, in particular, for measurement of deformations (stresses) in various structures by means of polarisation-optical transducers, and may be used in construction, transport, industrial production facilities, in inspection equipment. Design of a strain transducer is proposed, which includes a loading element of cylindrical shape with cuts that do not disturb integrity of the cylinder, and fixed on a controlled object, a piezooptic transducer placed in it, made of a photoelastic element (FE) fixed in the deliberately loaded state with a system of stress value transduction on the FE into an electric signal and a unit of signal processing, besides, the photoelastic element is cross-shaped in plan, and its frontal surfaces, parallel to direction of measured forces, are optically flat, and side surfaces of the FE have permanent and/or alternate curvature radius, at the same time the piezooptic transducer has its own body, which represents a cylinder with diameter below than the outer diameter of the FE, and where holes are made, through which ends of side surfaces of the FE protrude beyond the external dimensions of the cylinder, and in the loading element opposite to these ledges at the level of FE placement there are four through threaded holes, arranged in the plane perpendicular to the axis of the cylinder, and at the angle of 90 degrees relative to each other, for screws providing for the initial power load at the FE, at the same time the system of FE stress value transduction into the electric signal of the piezooptic transducer includes mechanisms of polarizer and quarter-wave-length plate rotation.

EFFECT: simplified design, its increased reliability and accuracy of deformation measurement, reduced dimensions - achieved by the fact that development of initial power load at FE in two mutually orthogonal directions is carried out by a controlled method, the piezooptic transducer has its own unified body and may be used with loading elements of various structures, at the same time dimension of the piezooptic transducer in the plane of measured stresses does not exceed FE size.

12 cl, 8 dwg