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Description
Laser Doppler Vibrometry (LDV) is a modern technology for measuring mechanical vibrations of different amplitudes with high precision and without physical contact. It finds wide applications in industry, engineering, scientific research, biology, and medicine. The remote nature of LDV operation allows measurement of vibrations in hard-to-reach or hazardous locations. Specifically, it can be used for detection of explosive objects buried in the soil.
The work is aimed at development of laser-acoustic method for detection of buried mines in the context of humanitarian demining in Ukraine. In this method, the LDV registers vibrations of the soil surface (seismic waves) excited by external influences, in particular, sound waves generated by a loudspeaker. An explosive object buried at a depth of several centimeters is detected by a higher speed (higher amplitude) of soil vibrations above it compared to neighboring soil.
In this work, the design and operating principle of developed laser Doppler vibrometer, and setup of the laboratory stand of laser-acoustic complex for measurement of soil vibrations are examined. The acoustic response spectra of the soils of different types with buried plastic simulant of soviet anti-personnel mine ПМН-2 have been analyzed in a frequency range of 50-1000 Hz. It is shown that the acoustic characteristics of a soil-mine system depend on the presence of a buried object, construction of its upper casing, distance from it, as well as on the type of soil and its humidity. This fact should be considered when trying to recognize the mine by the oscillation frequency.
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