With the motto 'There is no distinction between rural and urban areas in technological development,' the author's company has developed and commercialized a non-destructive inspection technology that leverages the characteristics of hammer impact responses to easily, accurately,and affordably diagnose the integrity of concrete structures and bolts. In recent years, accidents caused by bolt and nut failures have increased, becoming a social issue. Inspection of bolts and nuts mainly relies on sensory-based methods such as hammering sound method. Still, there are issues such as the lack of objectivity in judgment and the absence of recorded data. In the future,it will be necessary to employ technology that addresses these challenges in the maintenance and management of infrastructure.

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