本文提出了一种利用双光栅夹角变化测量金属丝杨氏模量的方法. 该方法利用莫尔条纹宽度对双光栅夹角变化的

高度敏感性，将动光栅放置在杠杆平台上，将不同拉力下金属丝的微小线位移转化为由双光栅夹角变化而引起的莫尔条纹宽

度的变化，进而计算得到金属丝的杨氏模量. 实验表明，该方法操作简单，数据准确，精确度高，实验结果符合预期.

A method of measuring Young’s modulus of metal wire by changing the double gratings’angle is presented. Based on the high sensitivity of Moiré pattern about the changing angle，the movable grating is placed on a lever platform so that the weeny linear displacement can be turned into the width variation of the Moiré pattern caused by the angular displacement between the two gratings. Correspondingly Young’s modulus of metal wire can be calculated. 　The experimental results have shown that this method is simple，accurate and in line with expectations.