抄録
Metal poles for illuminations and traffic-control signs on roads are corroded as the time passes and thus yields the collapse of those poles in case of typhoons or earthquakes. Especially in expressways, it is of great importance to detect the anomaly of the metal poles for preventing traffic accidents. Therefore, an effective method for anomaly diagnosis of metal poles is needed. The paper proposes the method of diagnosis based on the vibrational response obtained with an acceleration pickup when the poles are impacted with a light hammer. This method takes into account the fact that characteristic frequencies of the vibration become lower according to the progress of the corrosion.
