Fig. 1   Experiment arrangement (a) direct exciting on sensors; (b) exciting on the table (l=300mm)

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In the first experiment a mini sphere falls directly on the sensor and excites a dynamic vibration/shock to the sensor (see Fig. 1a). The vibration of sensor increases with the height of the exciting sphere. Fig. 2 shows the maximal amplitude of oscillation signals as function of the height h. A sensor output signal greater than 700mV can be generated by a 50mg metal sphere from the height of 30mm.

Fig. 2   Sensor output signal generated by a direct exciting on sensors with a mini sphere

Fig. 3 shows results from the second experiment. In this experiment a mini sphere falls down on a table (see Fig. 1b). The distance between the exciting point and sensor is 300mm. The exciting vibration/shock is transferred through the table to the sensor and detected by the sensor. The sensor is also very sensitive in this case.

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