Shallow underground target detection technology has received more and more attention, such as pipeline detection, cavity detection, underground military facility detection and underground archaeology. Based on the description of the acoustic-to-seismic coupling mechanism, the technology of laser speckle interferometry and its characteristics for acoustic-to-seismic coupling detection methods are summarized and analyzed. The subwoofer based on the sound catheter is used as the sound source excitation module, and the laser speckle interferometry system is used to conduct rapid detection experiments on the vibration characteristics of the ground surface coupled by sound waves, and the changes of laser speckle interference fringes are studied under different experimental conditions such as sound wave intensity and buried environment. Experimental results show that the laser speckle interferometry can be applied to the rapid measurement of acoustic-to-seismic coupling characteristic signals and has broad application prospects in the field of rapid non-destructive detection of flexible shallow buried objects.
To study the application of laser shearing speckle interferometric vibration measurement technology in acoustic resonance landmine detection, we present an experimental and theoretical study of the method for laser shearing speckle interferometric landmine detection based on time-average. The relationship between the out-of-plane displacement gradient generated by the sound wave on the ground and the phase change of the shearing interference laser is analyzed. A high-power loudspeaker is used as the source of sound wave excitation, and the laser shearing speckle interferometric vibration measurement system is used in landmine detection experiments to investigate the changes of laser shearing speckle interference fringes under different experimental conditions such as sound wave intensity, detection target, buried depth, and soil environment. The study reveals that it is feasible and effective to use laser shearing speckle interferometry to detect landmines, and it provides a theoretical and methodological basis for realizing the rapid scanning of acoustic-optic landmine detection.
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