METHOD FOR ULTRASONIC NON-DESTRUCTIVE QUALITY CONTROL OF FIBERGLASS PRODUCTS Russian patent published in 2021 - IPC G01N29/00 

FIELD: testing.

SUBSTANCE: area of application: for ultrasonic non-destructive quality control of fiberglass products. The essence of the invention consists in the fact that pulses of ultrasonic oscillations are emitted by an emitter, the pulses passed in the product are received by a receiver, the velocity of propagation thereof is measured, wherein the velocity (V) of longitudinal ultrasonic waves propagating along the normal to the plane of reinforcement of the fiberglass is measured at a pitch from 5 to 100 mm along the selected scanning direction at a frequency from 1 to 20 MHz using a single piezoelectric transducer or two piezoelectric transducers coaxially arranged at the opposite sides of the wall of the controlled product, followed by mapping the distribution of the velocity of longitudinal ultrasonic waves along the scanning direction – the ultrasonic profile of the product, analysing the ultrasonic profile and calculating the increment of velocity (ΔV) of longitudinal ultrasonic waves along the scanning direction according to a predetermined mathematical expression, followed by determining the value of maximum increment of the velocity of longitudinal ultrasonic waves ΔS_MAX and evaluating the quality of the product by comparing the value of maximum increment of the velocity of longitudinal ultrasonic waves ΔV _MAX with a predetermined threshold value.

EFFECT: possibility of ultrasonic non-destructive quality control of products made of layered fiberglass in the process of manufacture, experimental studies and operation of the products in order to assess the presence of inhomogeneities in the material and the capability of the products for maintaining the operating capacity thereof in the process of exposure to external factors within operational loads is provided.

1 cl, 3 dwg