An all-metal passive threshold sensor for omni-directional vibration monitoring application

This paper reports the design, fabrication and testing of an all-metal omni-directional passive threshold sensor for vibration monitoring. The entire structure is fabricated with nickel by low-temperature photoresist modeled electroplating technology. The fixed electrodes in horizontal and vertical direction have been designed as cantilever and multi-hole cross-beam, respectively, which can reduce the contact bouncing and damage effectively. The dynamic contact process is simulated by ANSYS software. The function of the proposed device has been demonstrated by dropping hammer system, which indicates that the threshold level in the horizontal direction is ~65g with holding time is ~40μs and 60g with holding time is ~150μs in the vertical direction.