METHOD FOR ACOUSTIC MONITORING OF ELECTRON-BEAM SURFACE ALLOYING IN VACUUM CHAMBERS Russian patent published in 2020 - IPC G01H3/14 C23C14/52 

FIELD: machine building.

SUBSTANCE: method of monitoring structural, phase and chemical transformations in a near-surface layer of treated objects in vacuum chambers under the effect of electron-beam pulses involves attaching a flexible waveguide to the processed object, accelerating beyond the vacuum chamber through a vacuum inlet, fixing the accelerometer on the waveguide and processing information from the latter using a computer. Signal received from the accelerometer is recorded in the form of time dependences of current values of signals in two or more frequency ranges from the beginning of exposure to the moment of amplitude drop of signals to level of background noise. Then envelopments of obtained dependences are selected, which are stretched in time by 50 or more times, thus forming new envelopes. For each frequency range, carrier signal frequency is selected within 50 to 1,000 Hz, ratios between frequencies for different ranges are selected to be the same as those present between average geometrical values of frequencies in selected frequency ranges for initial signal. New envelopes are used as modulating functions for corresponding carrier signals, modulated signals are summed up, amplified and transmitted to sound-producing device acting on operator's hearing organs.

EFFECT: shorter time for mastering the technology of processing new materials and high accuracy of adjusting modes of operation of process equipment, high quality of products of electron-beam processing.

1 cl, 5 dwg