Method of inspecting internal pressures in sealed containers

摘要: A nondestructive method for inspecting internal pressures of sealed containers wherein a magnetic impulsive force is impinged upon metallic surface the container and resulting vibration detected. The detected signal applied to plurality band-pass filters from which fundamental harmonics are extracted. two highest level signals extracted filters, designated harmonic, selected, analyzed by comparison predetermined values frequency their ratio levels with respect one another. judgment as integrity may be made based deviation aforesaid values.