The varying rule of self-inductance of solenoid is obtained by experimention measuring when an iron core is inserted in it and a method to measure Young 's modulus of metal by inductive shift sensor made with this rule is introduced .

通过实验测定，得出了螺线管中插入铁芯后，其自感系数随铁芯插入深度而变化的规律，介绍了利用这一 规律制作的电感式位移传感器测量金属 杨氏模量的方法。