Development of a new strain gage for measurements of two dimensional magnetostriction

Magnetostrictions occurring in ferromagnetic materials under alternating fl ux conditions can be measured by using strain gages, however, unnecessary v oltages are also induced in the common gages due to fluctuating outer magne tic field. To solve the problem, we developed a new strain gage that could remove the influence of the outer magnetic held and applied it to measuring two-dimensional magnetostrictions. The results show that the new gage is v ery useful in the accurate measurement of the magnetostrictions under rotat ing magnetic filed conditions. (C) 1999 Published by Elsevier Science B.V. All rights reserved.