RESONANCE METHOD OF ULTRASONIC THICKNESS MEASUREMENT Russian patent published in 2018 - IPC G01B17/02 

FIELD: measuring equipment.

SUBSTANCE: using for thickness measurements of samples of materials and products. Essence of invention consists in the fact that receiving transducer is installed on the surface of the monitored object at the registration point at the main excitation point, a short impact is made on the surface of the monitored object by the impactor, the receiving transducer at the registration point receives and records a signal of acoustic oscillations, the main resonance amplitude-frequency characteristic of the monitored object is measured and recorded, and by the frequency value ƒ_max, corresponding to the maximum value of the amplitude of the resonant amplitude-frequency characteristic in accordance with the formula H=C|2ƒ_max, determine the thickness H of the monitored object, and the registration point and the main excitation point is disposed on opposite faces forming the measured thickness of the article to be controlled, orienting the line connecting the registration point and the main excitation point, so that it is perpendicular to the faces of the object and passes through the center of the face of the registration point location, without changing the position of the registration point, N times move the point of excitation into N additional positions, each of the next of which is separated from any of the previous positions by a distance not less than 0.2 N, at each additional point of excitation, hit the impactor on the surface of the monitored object, the receiving transducer receives and records the acoustic oscillation signal, measures and records N additional resonance amplitude-frequency characteristics, all the recorded resonant amplitude-frequency characteristics are multiplied among themselves, and the value of N is chosen from the condition N≥1.

EFFECT: increased reliability and accuracy of measurement results for the thickness of the monitored objects.

1 cl, 4 dwg