Apparatus for low g-level vibrational pulse detection

摘要

Apparatus is provided for monitoring vibrational activity proximate to a source of mechanical vibration. The apparatus includes a bridge rectifier which may be positioned proximate to the source, and which provides a voltage output when the source generates a pattern of mechanical vibrations of very low g-level over a brief time interval, such pattern comprising a low g-level vibrational pulse. The apparatus also includes an amplifier coupled to the bridge rectifier for amplifying the voltage output, and further includes a device responsive to the amplified voltage output for providing notice when the source generates a low g-level vibrational pulse. A timing device which is responsive to the amplified voltage output provides a record of the time which elapses between the occurrence of a specified event, which precedes the vibrational pulse, and the occurrence of the vibrational pulse.