High Sensitive Magnetoelastic Sensors for Measurements of Mechanical Quantities
Magnetoelastic sensors are very sensitive for measurements of mechanical vibration, shock, strain, force and
acceleration etc. This is shown in the following experiments results.
Fig. 1 Experiment arrangement (a) direct exciting on sensors; (b) exciting on the table (l=300mm)
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.
Fig. 3 Sensor output signal generated by a indirect exciting on a table with a sphere
