A simple, rugged Terfenol-based magnetostrictive magnetometer prototype has been developed. Experiments were performed to determine the optimum operating point for the transducer and to study the characteristic of the diode laser sensor. A laboratory prototype has been constructed and evaluated under different field strengths and frequencies. Nonlinear responses were observed and their origin examined. The origin of the nonlinearity was interpreted as a result of running the diode laser sensor at an improper operating point. The device has an ultimate sensitivity of 160*10/sup -6/ A/m (=2 mu -Oe).>
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Chung et al. (1991) studied this question.
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