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中文摘要：
分析和测试了磁致伸缩材料磁弹性内耗的偏置磁场依赖特性，发现Terfenol-D的品质因数（与内耗的量值成反比）强依赖于偏置磁场.利用磁致伸缩材料磁弹性内耗强依赖于偏置磁场的特性，提出了一种静态和准静态磁场的磁传感器方法，即将磁致伸缩材料与压电变压器单元层叠构建一种复合变压器.分析表明：在谐振状态下，复合变压器的输出电压正比于其品质因数，于是复合变压器的输出电压强依赖于偏置磁场；磁致伸缩材料的ΔE效应对复合变压器输出电压的影响很小.制备Terfenol-D/PZT8复合变压器进行了实验，结果表明，在近谐振状态下，当激励输入电压振幅为0.5 V时，复合变压器工作的输出电压对静态磁场的灵敏度达到-~5.12 mV·Oe^-1.
英文摘要：
The magnetoelastic damping in magnetostrictive material is investigated. It is noted that the quality factor （the inverse measure of damping） of giant magnetostrictive material Terfenol-D is strongly dependent on bias direct current （DC） magnetic field. Taking advantage of the DC field dependence of magnetoelastic damping in magnetostrictive material, a DC or quasistatic magnetic sensor is proposed. The sensor is designed as a composite piezoelectric transformer （CPT） which is fabricated by bonding magnetostrictive material and piezoelectric transformer in layers. Theoretical analysis shows that the output voltage of the CPT is directly proportional to the quality factor of the CPT. Therefore, the output voltage of the CPT also strongly depends on DC field due to the strong field dependence effect of quality factor in magnetostrictive material. In addition, the ΔE effect of magnetostrictive material has little influence on the magnitude of the output voltage. A Terfenol-D/PZT8 composite transformer is fabricated for experiment. The experimental results show that the output sensitivity to DC field achieves ~5.12 mV·Oe^-1 when the CPT is driven near resonance by an AC voltage with amplitude of 0.5 V.
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