OPTICAL FIBER STRENGTH CONTROL METHOD Russian patent published in 2021 - IPC G01N21/88 G01N29/14 

FIELD: optic fiber testing.

SUBSTANCE: invention relates to the field of non-destructive testing of the strength of optical fibers made of fused quartz glass. Essence: an acoustic effect is exerted on the controlled object at the first frequency and at the second frequency, a signal of nonlinear acoustic emission is measured at a difference frequency and the degree of destruction of the controlled object is estimated based on the results of processing measurement data. As a controlled object and a distributed acoustic sensor, the same optical fiber is used, which is acoustically affected and with which signals are measured at the first, second and difference frequencies. The levels of acoustic impact signals are adjusted so as to ensure equality of the amplitudes of the signals measured at the first and second frequencies, after which the signals are measured at the first, second and difference frequencies, while preliminary measurements are performed on an exemplary optical fiber, the strength of which is known, and then, under the same conditions, on the tested optical fiber, after which the strength of the tested optical fiber is determined by the formula.

EFFECT: expansion of the scope of application.

1 cl, 1 dwg