METHOD FOR NON-DESTRUCTIVE TESTING OF OPTICAL FIBER STRENGTH Russian patent published in 2021 - IPC G01N29/14 G01H9/00 

FIELD: optical fiber strength testing.

SUBSTANCE: invention is intended for non-destructive testing of optical fiber strength. The substance of the invention lies in the fact that a voltage is created in the optical fiber using a source of acoustic influence located near the optical fiber, the same optical fiber with a measuring system connected to it is used as a distributed acoustic sensor, with which an acoustic signal is recorded in the zone of acoustic influence, based on the results of processing this signal, an acoustic emission signal and an acoustic exposure signal are isolated, wherein under the same conditions, measurements are preliminarily performed for a reference optical fiber, the strength of which is known, and then for the controlled optical fiber, after which the strength of the controlled optical fiber is calculated, while the voltage in the optical fiber is created by an acoustic source operating at the same frequency, when processing the recorded signal, a signal of nonlinear acoustic emission is extracted from it at the harmonics of the frequency of the acoustic source and the strength of the controlled optical fiber is calculated according to a certain formula.

EFFECT: ensuring the possibility of reducing the error in assessing the strength of an optical fiber.

1 cl, 1 dwg