ORNL develops acoustic tunnel detection method using upward sound waves
By
Georgina Jedikovska
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Summary
Researchers at Oak Ridge National Laboratory (ORNL) have developed a novel acoustic tunnel detection method that reverses the traditional approach by sending sound waves upward from below a tunnel rather than downward from the surface. This technique captures signal scatter that is otherwise lost, generating distinctive subharmonic signals that can reveal hidden underground tunnels beneath roads and railways. The method offers improved detection capabilities for security and infrastructure monitoring purposes.
Key quotes
· 2 pulledOur hypothesis was that if we reversed direction, sending the signal from below a potential tunnel instead of above, we could improve detection by capturing signal scatter that otherwise is lost.
Tunnel detection usually relies on signals sent downwards from the surface. Still, for the project, the team flipped the process and transmitted sound upward from below a tunnel to generate a distinctive subharmonic signal.
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