Feedback method and apparatus for testing the internal pressure of a sealed container

摘要: A method of and an apparatus for testing the internal pressure a sealed container carried on conveyor belt by striking with electromagnetic pulse thereby causing its wall to vibrate, check based upon frequency vibratory sound produced container. The is converted electrical signal electroacoustic transducer returned device in feedback path strike repetitively same sound. repetitive produces continuously without damping at commensurate natural vibration can be out stable manner increased accuracy. reject system responsive permit passage or remove from belt.