METHOD OF FREQUENCY CONVERSION OF ACOUSTIC EMISSION SIGNALS Russian patent published in 2017 - IPC G01N29/14 

FIELD: acoustics.

SUBSTANCE: invention can be used for nondestructive testing by acoustic emission (AE) to detect leakages, dry friction, phase conversions, developing cracks and plastic deformation in technical devices for various purposes, as well as to control parameters of technological processes. Core of the invention is that an initially received mixture of signals of acoustic emission (AE), noise and interference is exposed to Fourier transform, as the result of which formed is, in particular, an array of frequencies, which is changed by division into approximately 100 of each of the frequency values of the array of frequencies; using the created new array of frequencies inverse Fourier transform is performed; produced by the inverse Fourier transformation signal in the form of an amplitude-time function is reproduced by means of an acoustic speaker, thus reproducing the mixture of ultrasonic (inaudible for a human) AE signals, noise and interference in the audio range audible for a human.

EFFECT: enabling detection of faults of technical devices, controlling parameters of processes due to detection of AE signals on the background of noise and interference.

1 cl, 1 dwg