Apparatus for acoustic-emission inspection of articles

PCT No. PCT/SU88/00091 Sec. 371 Date Dec. 19, 1989 Sec. 102(e) Date Dec. 19, 1989 PCT Filed Apr. 20, 1988 PCT Pub. No. WO89/10560 PCT Pub. Date Nov. 2, 1989.The apparatus for acoustic-emission inspection of articles has channels each including a series connection of a transducer of acoustic emission signals, positionable on an article under inspection, and an amplifier of electric signals, having connected to its output a unit for measuring the parameters of acoustic emission signals and a shaper of single pulses, of which the output is connected to the first input of a unit for measuring time intervals. The other input of the unit for measuring time intervals of each channel is connected to the output of a clock pulse generator. The output of the clock pulse generator is also connected to the input of a frequency divider. The apparatus further comprises an OR gate of which the inputs, in a number equalling the number of the channels, are connected to the outputs of the shapers of single pulses of each channel, and the output is connected to the third inputs of the units for measuring time intervals in each channel. The outputs of the units for measuring the parameters of acoustic emission signals and of the units for measuring time intervals of each channel are connected to the inputs of a switching device. A computer for processing acoustic emission data is connected to the switching device.