To solve the problems the traditional process of measuring magnetostrictive coefficient and predict the telescopic performance of magnetostrictive materials more effectively, a novel model of experimental device was presented to measure magnetostrictive coefficient with the non-balanced current bridge, changing the measurement of length into the measurement of the resistance and the galvanometer deflection value, and using the idea of the overall substitution to deduce the calculating formula to calculate magnetostriction coefficient with the agalvanometer deflection value. Taking the impacts of the contact resistance of the knob of resistance box, the temperature and the drift phenomenon of magnetoresistance effect into consideration, the result calculated from magnetostriction coefficient by the novel device model is more realistic than the measurement result obtained the balanced current bridge, which not only saves measurement time and simplifies the measurement process, but also increases the accuracy of the measurement results.%提出了一种新的利用非平衡电桥测量磁致伸缩系数的实验装置模型,将长度测量转化成电阻和检流计偏转值的测量,并利用整体代换等思想推导得到了用检流计偏转值计算磁致伸缩系数的计算式.考虑到电阻箱旋钮的接触电阻、温度和磁阻效应产生漂移现象的影响,由新装置模型的磁致伸缩系数计算式得出的测量结果比平衡电桥的测量结果更加符合实际,不仅节约了测量时间,简化了测量过程和难度,也提高了测量结果的精确度.
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