我们设计和研究了用于测量超导薄膜穿透深度的双线圈互感装置，用数值模拟的方法对线圈及其位形进行了优化．对磁控溅射制备的不同厚度的铌膜在不同温度下的测量结果表明，我们的设计大大提高了实验的准确性和稳定性，并得到了理论预期的随膜厚和温度的变化关系 We designed and studied a dual coil mutual inductance device for measuring the depth of penetration of a superconducting thin film. The coil and its configuration were optimized by numerical simulation. The results of measurement of niobium films with different thickness prepared by magnetron sputtering at different temperatures show that our design greatly improves the accuracy and the stability of the experiment and obtains the theoretically expected relationship between film thickness and temperature