为优化传统实验中测量金属线性膨胀系数实验方案的不足，利用成一定比例的杠杆将夫琅禾费单缝衍射系统和金属受热膨胀系统相结合，使金属棒受热发生的微小膨胀现象转化为衍射条纹宽度变化的直观物理现象，并采用电动推杆机竖直匀速推动智能手机，使phyphox软件实时采集衍射条纹的光照度分布信息，进而实现金属线性膨胀系数的分析测量.该装置不仅可以得到高精确度的实验结果，且能有效降低实验成本；为提高学生实验创新能力、动手搭建能力提供了有效参考方案.

To optimize the measurement of metal′s linear expansion coefficient, a lever system combines Fraunhofer single-slit diffraction with thermal expansion. The small expansion is reflected in diffraction fringe changes, while Phyphox collects real-time data, enabling precise measurements. This setup improves accuracy, reduces costs, and enhances students′ innovation and practical skills.