Magnet-Solenoid type active vibrometer for non-destructive testing of electric power transmission line insulators

An active vibrometer used for the non-destructive test of electric power transmission line insulators has been developed. With a permanent magnet and a couple of coils, the vibrometer exerts impact force to a test object and in turn picks up the vibration of the object. The resonance frequencies with the amplitudes obtained from the vibrometer are used as a basis for detecting defects in the object. The vibrometer is controlled by an electronic device designed to facilitate the fully automated testing process with consistent repeatability and reliability which are essential to the non-destructive test. The vibrometer is expected to be applied to the wide area of defect detection including the classification of mechanical parts in production and inspection processes.