RESONANCE METHOD FOR ULTRASONIC THICKNESS MEASUREMENT Russian patent published in 2022 - IPC G01B17/02 

FIELD: ultrasonic thickness measurement.

SUBSTANCE: invention relates to the field of ultrasonic thickness measurement. The essence of the invention lies in the fact that damped oscillations are excited in a controlled object by a short impact of the impactor on the surface of the controlled object to the excitation point, which is the geometric center of the excitation face, and signals of acoustic resonant oscillations are recorded, on the basis of which the amplitude-frequency characteristic of the controlled object is calculated, according to which measure the value of the frequency ƒ_max corresponding to the maximum amplitude of the amplitude-frequency characteristic, and according to the formula H=C/2ƒ_max, where C is the speed of propagation of an acoustic wave in the material of the controlled object, determine the value of the thickness H of the controlled object, while recording signals resonant oscillations are carried out by receiving a signal of the main resonant oscillation at the main registration point located in the geometric center of the face opposite to the excitation face, and signals of additional resonant oscillations at additional points reg the distance from the point of excitation to the point of reception of the signal of the main resonant vibration is the measured thickness H of the controlled object, the signal of the main resonant vibration is inverted in phase, then summed with the signals of additional resonant vibrations, according to the obtained the signal of the total resonant oscillation determine the amplitude-frequency characteristic of the controlled object.

EFFECT: increasing the reliability and accuracy of the results of measuring the thickness of compact samples of materials and products having a three-dimensional shape of a cube or parallelepiped.

1 cl, 4 dwg