测振型频率是分析结构动力性能的重要手段。本文提出了一种测振型频率的新方法——电位差法。其特点是:精确度高、稳定、应用范围广、操作简单、使用方便。尤其是对特种结构象轮机叶片、直升机旋翼等有其实际应用价值。本方法还可用于测量动应变。电位差电路是利用连接于电路中的电阻应变片R_1作为变换元件。 Vibration mode frequency is an important means to analyze the dynamic performance of the structure. In this paper, we propose a new method of vibration mode frequency-potential difference method. Its features are: high precision, stable, wide range of applications, simple operation, easy to use. Especially for special structures such as turbine blades, helicopters and other rotor has its practical value. The method can also be used to measure dynamic strain. The potential difference circuit uses a resistance strain gauge R_1 connected to the circuit as a conversion element.