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

FIELD: testing of the strength of optical fibers.

SUBSTANCE: invention relates to the field of non-destructive testing of the strength of optical fibers made of fused quartz glass. In the claimed method of controlling the strength of the optical fiber in the controlled object, a voltage is created and an acoustic signal is measured, according to the results of processing which an acoustic emission signal is isolated and the characteristics of the controlled object are evaluated. In this case, the object of control is an optical fiber, in which a voltage is created using an acoustic source 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 measured in the acoustic impact zone, according to the results of processing which an acoustic emission signal and an acoustic impact signal are isolated. Moreover, under the same conditions, measurements are previously performed for a sample optical fiber, the strength of which is known, and then for a controlled optical fiber, after which the strength of the controlled optical fiber is determined by the formula (3), where σ₀, σ_T are the strength estimates of the sample and controlled optical fiber, respectively. W_a0, W_aT are estimations of the acoustic emission energy obtained as a result of measurements on the sample and controlled optical fibers for the acoustic impact zone, respectively; W_s0, W_sT are estimations of the acoustic impact signal energy obtained as a result of measurements on the sample and controlled optical fibers for the acoustic impact zone, respectively; n - the corrosion coefficient of fused quartz glass of the optical fiber.

EFFECT: technical result is an expansion of the scope of application.

1 cl, 1 dwg