超声波声速测量的谱分析技术

Application of Spectral Analysis Technique in Measuring Sound Velocity of Thin Material

对薄型材料中超声波传播规律进行分析,得到材料声速与共振频率的关系。通过对铝板和钢板进行实验,并运用快速傅立叶变换和自回归模型对超声透射信号进行谱分析,得到共振频率,求得材料声速。实验结果与理论分析结果一致。

The relation between sound velocity and syntonic frequency is gained by analyzing the ultrasound transmitting in thin material. Taking thin aluminum and steel board for examples, transmitted signal is analyzed by fast Fourier transform （FFT） and autoregressive model. The results of experiment agreed well with theory analysis.