PUNCH SENSOR

摘要

A monitor for sensing punch speed and force uses a piezo electric layer supported on an open cell compressible foam. The foam is mounted on a relatively non compressible surface and the impact of the blow is sensed when the piezo layer is struck and when the foam is compressed to give a time interval to enable the time of flight and thus the punch velocity to be determined. The punch magnitude may also be determined. Preferably a second piezo layer is used on the back of the foam.