METHOD FOR MEASURING ATTENUATION VARIABLES OF ELASTIC WAVES Russian patent published in 1998 - IPC

FIELD: nondestructive inspections; quality control, metering structure-phase states and physical and mechanical variables of materials and structural components, including acoustic spectroscopy of mountain rock by measuring attenuation constant of elastic waves and its frequency dependence. SUBSTANCE: elastic waves are radiated into medium under inspection, wave amplitude is measured at two points on same straight line of wave propagation for different frequencies of oscillations excited by source, and such measurements are made for two relatively opposite directions of wave propagation; measurement results are used to determine amplitude-frequency responses of section having average length l and enclosed by signal recording points; frequency dependence of attenuation constant α(ω) of elastic waves in material is found from formula , where K_f and K_r are amplitude-frequency responses found for forward and reverse directions of elastic wave propagation in material, respectively. EFFECT: improved confidence of inspection results. 1 dwg