瑞利波（Rayleigh波）检测具有无损、快速、经济、方便等特点，目前在地球物探等工程领域应用广泛，如何准确可靠地提取频散曲线是瑞利波勘探和损伤检测的一项关键技术。对道面脱空检测中瑞利波频散曲线的提取进行研究，通过对不同频散曲线提取方法的理论分析，并采用τ-p变换法和f-k变换法对试验数据进行处理，对比了两种方法的处理效果。结果表明:两种方法都可成功获取脱空信号，但在道面脱空检测中，f-k变换法提取频散曲线要优于τ-p变换法，对解决利用瑞利波进行道面脱空检测时的频散曲线的提取问题具有理论和应用价值。

Rayleigh wave detection, which is characteristic of being nondestructive, fast, economical, convenient, has been used widely in some engineering field such as earth exploration. The accurate extraction of dispersion curve is the key technique in Rayleigh wave exploration and damage detection. In this paper the dispersion curve extraction of Rayleigh wave in pavement void detection is studied by theoretical analysis of different dispersion curves extraction ways, and processing experimental data by τ-p conversion and f-k conversion. The comparison of the two handling methods is given and f-k conversion is better than τ-p conversion in pavement void detection. There are theory and application benefits for dispersion curves extraction of Rayleigh wave in pavement void detection.