本论文提出一种基于F-P 标准具的金属线膨胀系数测量方法.该方法利用光杠杆将金属棒受热膨胀时的伸长量转

化为F-P 标准具干涉光场中干涉条纹半径的变化，通过测量干涉条纹的间距便可实现对金属线膨胀系数的测量.由于该方法

仅需测量F-P 标准具干涉光场中外侧条纹的间距，并且F-P 标准具的多光束等倾干涉可以产生锐利的干涉条纹，因此测量过

程更加简便，实验结果的精确度更高.通过实验测量验证了该方法的可行性与可靠性.

 In this paper，a method for measuring linear expansion coefficient of metal based on the Fabry-Perot

( F-P) etalon is proposed. The elongation of metal rod during thermal expansion can be converted into the

change of interference fringe radius in interference optical field of F-P etalon via optical lever. The linear expansion

coefficient of metals can be obtained by measuring the distance between interference fringes. It only needs to measure

the distance between the outer fringes of the interference optical field by the F-P etalon，and the multi-beam equal

inclination interference of the F-P etalon can produce sharp interference fringes，the measurement process is

much simpler，and the accuracy of the measurement result is much higher. The experiment results have demonstrated

the feasibility and reliability of the method.