Effect of thickness of MS layer on sensing voltage

Increased thickness of MS layer results in better sensing as MS layer is in position to sustain higher stresses which results in increased sensing voltage.

Figure 33.8: Stress in the MS layer due to magnetostriction with the change of MS layer thickness for unidirectional laminate

Figure 33.8 shows that increasing the thickness of MS layer from 0.1mm to 0.8mm, increase in stresses cause increase in voltage from 51mV to 97 mV when the MS layer is placed at the top layer. A nominal increase is also predicted for MS layer placed at the centre of the laminate.

Effect of actuating current on sensing voltage

Figure 33.9: Open circuit voltage in the sensing coil with the increase in current in actuating coil.

Figure 33.9 shows the effect of actuating current on the sensing capability of the MS layer. It is obvious that increased current rating is going to increase the magnetostriction capability. Hence, increased sensing voltage is expected.