Abstract
An acoustic technique of nondestructive testing of a local microcracking degree in laboratory mineral samples is proposed based on laser generation of ultrasound. A spectral power of broadband signals of longitudinal ultrasonic waves is measured, which are generated by absorption of pulsed laser radiation in a special material served as a laser source of ultrasound and further scattered on microcracks in samples (the so called structural noise power). The direct relationship between an increase in microcracking and a growth in the structural noise power in scanning regions of the samples has been obtained for feldspars of two types. For the first time, an independent method of X-ray computer tomography of the complex-shaped samples confirmed the reliability of the results of acoustic measurements. The established relationship between the local microcracking and structural noise power can be used in the monitoring systems for observing the crack formation in rocks and minerals under different external loadings.
Published Version
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